Merge pull request #11 from rkuris/battery-icon-improvements

Battery icon improvements

MPPT_Code/MPPT_Code.ino

@@ -1,597 +0,0 @@
-//----------------------------------------------------------------------------------------------------
-// ARDUINO MPPT SOLAR CHARGE CONTROLLER (Version-3) 
-//  Author: Debasish Dutta/deba168
-//          www.opengreenenergy.in
-//
-//  This code is for an arduino Nano based Solar MPPT charge controller.
-//  This code is a modified version of sample code from www.timnolan.com
-//  updated 06/21/2015
-//
-//  Mods by Aplavins 06/19/2015 
-
-////  Specifications :  //////////////////////////////////////////////////////////////////////////////////////////////////////
-                                                                                                                            //
-//    1.Solar panel power = 50W                                            
-                                                                                                                            //
-//    2.Rated Battery Voltage= 12V ( lead acid type )
-
-//    3.Maximum current = 5A                                                                                                //
-
-//    4.Maximum load current =10A                                                                                            //
-
-//    5. In put Voltage = Solar panel with Open circuit voltage from 17 to 25V                                               //
-
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
-
-
-
-#include "TimerOne.h"                // using Timer1 library from http://www.arduino.cc/playground/Code/Timer1
-#include <LiquidCrystal_I2C.h>      // using the LCD I2C Library from https://bitbucket.org/fmalpartida/new-liquidcrystal/downloads
-#include <Wire.h>  
-
-//----------------------------------------------------------------------------------------------------------
- 
-//////// Arduino pins Connections//////////////////////////////////////////////////////////////////////////////////
-
-// A0 - Voltage divider (solar)
-// A1 - ACS 712 Out
-// A2 - Voltage divider (battery)
-// A4 - LCD SDA
-// A5 - LCD SCL
-// D2 - ESP8266 Tx
-// D3 - ESP8266 Rx through the voltage divider
-// D5 - LCD back control button
-// D6 - Load Control 
-// D8 - 2104 MOSFET driver SD
-// D9 - 2104 MOSFET driver IN  
-// D11- Green LED
-// D12- Yellow LED
-// D13- Red LED
-
-// Full scheatic is given at http://www.instructables.com/files/orig/F9A/LLR8/IAPASVA1/F9ALLR8IAPASVA1.pdf
-
-///////// Definitions /////////////////////////////////////////////////////////////////////////////////////////////////
-
-
-#define SOL_VOLTS_CHAN 0               // defining the adc channel to read solar volts
-#define SOL_AMPS_CHAN 1                // Defining the adc channel to read solar amps
-#define BAT_VOLTS_CHAN 2               // defining the adc channel to read battery volts
-#define AVG_NUM 8                      // number of iterations of the adc routine to average the adc readings
-
-// ACS 712 Current Sensor is used. Current Measured = (5/(1024 *0.185))*ADC - (2.5/0.185) 
-
-#define SOL_AMPS_SCALE  0.026393581        // the scaling value for raw adc reading to get solar amps   // 5/(1024*0.185)
-#define SOL_VOLTS_SCALE 0.029296875        // the scaling value for raw adc reading to get solar volts  // (5/1024)*(R1+R2)/R2 // R1=100k and R2=20k
-#define BAT_VOLTS_SCALE 0.029296875        // the scaling value for raw adc reading to get battery volts 
-
-#define PWM_PIN 9                    // the output pin for the pwm (only pin 9 avaliable for timer 1 at 50kHz)
-#define PWM_ENABLE_PIN 8            // pin used to control shutoff function of the IR2104 MOSFET driver (hight the mosfet driver is on)
-#define PWM_FULL 1023                // the actual value used by the Timer1 routines for 100% pwm duty cycle
-#define PWM_MAX 100                  // the value for pwm duty cyle 0-100%
-#define PWM_MIN 60                  // the value for pwm duty cyle 0-100% (below this value the current running in the system is = 0)
-#define PWM_START 90                // the value for pwm duty cyle 0-100%
-#define PWM_INC 1                    //the value the increment to the pwm value for the ppt algorithm
-
-#define TRUE 1
-#define FALSE 0
-#define ON TRUE
-#define OFF FALSE
-
-#define TURN_ON_MOSFETS digitalWrite(PWM_ENABLE_PIN, HIGH)      // enable MOSFET driver
-#define TURN_OFF_MOSFETS digitalWrite(PWM_ENABLE_PIN, LOW)      // disable MOSFET driver
-
-#define ONE_SECOND 50000            //count for number of interrupt in 1 second on interrupt period of 20us
-
-#define LOW_SOL_WATTS 5.00          //value of solar watts // this is 5.00 watts
-#define MIN_SOL_WATTS 1.00          //value of solar watts // this is 1.00 watts
-#define MIN_BAT_VOLTS 11.00         //value of battery voltage // this is 11.00 volts          
-#define MAX_BAT_VOLTS 14.10         //value of battery voltage// this is 14.10 volts
-#define BATT_FLOAT 13.60            // battery voltage we want to stop charging at
-#define HIGH_BAT_VOLTS 13.00        //value of battery voltage // this is 13.00 volts 
-#define LVD 11.5                    //Low voltage disconnect setting for a 12V system
-#define OFF_NUM 9                   // number of iterations of off charger state
-  
-//------------------------------------------------------------------------------------------------------
-//Defining led pins for indication
-#define LED_RED 11
-#define LED_GREEN 12
-#define LED_YELLOW 13
-//-----------------------------------------------------------------------------------------------------
-// Defining load control pin
-#define LOAD_PIN 6       // pin-2 is used to control the load
-  
-//-----------------------------------------------------------------------------------------------------
-// Defining lcd back light pin
-#define BACK_LIGHT_PIN 5       // pin-5 is used to control the lcd back light
-//------------------------------------------------------------------------------------------------------
-/////////////////////////////////////////BIT MAP ARRAY//////////////////////////////////////////////////
-//-------------------------------------------------------------------------------------------------------
-byte solar[8] = //icon for termometer
-{
-  0b11111,
-  0b10101,
-  0b11111,
-  0b10101,
-  0b11111,
-  0b10101,
-  0b11111,
-  0b00000
-};
-
-byte battery[8]=
-{
-  0b01110,
-  0b11011,
-  0b10001,
-  0b10001,
-  0b11111,
-  0b11111,
-  0b11111,
-  0b11111,
-};
-
-byte _PWM [8]=
-{
-  0b11101,
-  0b10101,
-  0b10101,
-  0b10101,
-  0b10101,
-  0b10101,
-  0b10101,
-  0b10111,
-};
-//-------------------------------------------------------------------------------------------------------
-
-// global variables
-
-float sol_amps;                       // solar amps 
-float sol_volts;                      // solar volts 
-float bat_volts;                      // battery volts 
-float sol_watts;                      // solar watts
-float old_sol_watts = 0;              // solar watts from previous time through ppt routine 
-unsigned int seconds = 0;             // seconds from timer routine
-unsigned int prev_seconds = 0;        // seconds value from previous pass
-unsigned int interrupt_counter = 0;   // counter for 20us interrrupt
-unsigned long time = 0;               // variable to store time the back light control button was pressed in millis
-int delta = PWM_INC;                  // variable used to modify pwm duty cycle for the ppt algorithm
-int pwm = 0;                          // pwm duty cycle 0-100%
-int back_light_pin_State = 0;         // variable for storing the state of the backlight button
-int load_status = 0;                  // variable for storing the load output state (for writing to LCD)
-  
-enum charger_mode {off, on, bulk, bat_float} charger_state;    // enumerated variable that holds state for charger state machine
-// set the LCD address to 0x27 for a 20 chars 4 line display
-// Set the pins on the I2C chip used for LCD connections:
-//                    addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
-LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address
-
-
-//------------------------------------------------------------------------------------------------------
-// This routine is automatically called at powerup/reset
-//------------------------------------------------------------------------------------------------------
-
-void setup()                           // run once, when the sketch starts
-{
-  pinMode(PWM_ENABLE_PIN, OUTPUT);     // sets the digital pin as output
-  TURN_OFF_MOSFETS;                    // turn off MOSFET driver chip
-  charger_state = off;                 // start with charger state as off
-  pinMode(LED_RED, OUTPUT);            // sets the digital pin as output
-  pinMode(LED_GREEN, OUTPUT);          // sets the digital pin as output
-  pinMode(LED_YELLOW, OUTPUT);         // sets the digital pin as output
-  Timer1.initialize(20);               // initialize timer1, and set a 20uS period
-  Timer1.pwm(PWM_PIN, 0);              // setup pwm on pin 9, 0% duty cycle
-  Timer1.attachInterrupt(callback);    // attaches callback() as a timer overflow interrupt
-  Serial.begin(9600);                  // open the serial port at 38400 bps:
-  pwm = PWM_START;                     // starting value for pwm  
-  pinMode(BACK_LIGHT_PIN, INPUT);      // backlight on button
-  pinMode(LOAD_PIN,OUTPUT);            // output for the LOAD MOSFET (LOW = on, HIGH = off)
-  digitalWrite(LOAD_PIN,HIGH);         // default load state is OFF
-  lcd.begin(20,4);                     // initialize the lcd for 16 chars 2 lines, turn on backlight
-  lcd.noBacklight();                   // turn off the backlight
-  lcd.createChar(1,solar);             // turn the bitmap into a character
-  lcd.createChar(2,battery);           // turn the bitmap into a character
-  lcd.createChar(3,_PWM);              // turn the bitmap into a character
-}
-
-//------------------------------------------------------------------------------------------------------
-// Main loop
-//------------------------------------------------------------------------------------------------------
-void loop()                         
-{
-  read_data();                         // read data from inputs
-  run_charger();                       // run the charger state machine
-  print_data();                        // print data
-  load_control();                      // control the connected load
-  led_output();                        // led indication
-  lcd_display();                       // lcd display
-  
-}
-
-
-//------------------------------------------------------------------------------------------------------
-// This routine reads and averages the analog inputs for this system, solar volts, solar amps and 
-// battery volts. 
-//------------------------------------------------------------------------------------------------------
-int read_adc(int channel){
-  
-  int sum = 0;
-  int temp;
-  int i;
-  
-  for (i=0; i<AVG_NUM; i++) {          // loop through reading raw adc values AVG_NUM number of times  
-    temp = analogRead(channel);        // read the input pin  
-    sum += temp;                       // store sum for averaging
-    delayMicroseconds(50);             // pauses for 50 microseconds  
-  }
-  return(sum / AVG_NUM);               // divide sum by AVG_NUM to get average and return it
-}
-
-//------------------------------------------------------------------------------------------------------
-// This routine reads all the analog input values for the system. Then it multiplies them by the scale
-// factor to get actual value in volts or amps. 
-//------------------------------------------------------------------------------------------------------
-void read_data(void) {
-  
-  sol_amps = (read_adc(SOL_AMPS_CHAN) * SOL_AMPS_SCALE -12.01);    //input of solar amps
-  sol_volts = read_adc(SOL_VOLTS_CHAN) * SOL_VOLTS_SCALE;          //input of solar volts 
-  bat_volts = read_adc(BAT_VOLTS_CHAN) * BAT_VOLTS_SCALE;          //input of battery volts 
-  sol_watts = sol_amps * sol_volts ;                               //calculations of solar watts                  
-}
-
-//------------------------------------------------------------------------------------------------------
-// This is interrupt service routine for Timer1 that occurs every 20uS.
-//
-//------------------------------------------------------------------------------------------------------
-void callback()
-{
-  if (interrupt_counter++ > ONE_SECOND) {        // increment interrupt_counter until one second has passed
-    interrupt_counter = 0;                       // reset the counter
-    seconds++;                                   // then increment seconds counter
-  }
-}
-
-//------------------------------------------------------------------------------------------------------
-// This routine uses the Timer1.pwm function to set the pwm duty cycle.
-//------------------------------------------------------------------------------------------------------
-void set_pwm_duty(void) {
-
-  if (pwm > PWM_MAX) {					   // check limits of PWM duty cyle and set to PWM_MAX
-    pwm = PWM_MAX;		
-  }
-  else if (pwm < PWM_MIN) {				   // if pwm is less than PWM_MIN then set it to PWM_MIN
-    pwm = PWM_MIN;
-  }
-  if (pwm < PWM_MAX) {
-    Timer1.pwm(PWM_PIN,(PWM_FULL * (long)pwm / 100), 20);  // use Timer1 routine to set pwm duty cycle at 20uS period
-    //Timer1.pwm(PWM_PIN,(PWM_FULL * (long)pwm / 100));
-  }												
-  else if (pwm == PWM_MAX) {				   // if pwm set to 100% it will be on full but we have 
-    Timer1.pwm(PWM_PIN,(PWM_FULL - 1), 20);                // keep switching so set duty cycle at 99.9% 
-    //Timer1.pwm(PWM_PIN,(PWM_FULL - 1));              
-  }												
-}	
-
-//------------------------------------------------------------------------------------------------------
-// This routine is the charger state machine. It has four states on, off, bulk and float.
-// It's called once each time through the main loop to see what state the charger should be in.
-// The battery charger can be in one of the following four states:
-// 
-//  On State - this is charger state for MIN_SOL_WATTS < solar watts < LOW_SOL_WATTS. In this state isthe solar 
-//      watts input is too low for the bulk charging state but not low enough to go into the off state. 
-//      In this state we just set the pwm = 99.9% to get the most of low amount of power available.
-
-//  Bulk State - this is charger state for solar watts > MIN_SOL_WATTS. This is where we do the bulk of the battery
-//      charging and where we run the Peak Power Tracking alogorithm. In this state we try and run the maximum amount
-//      of current that the solar panels are generating into the battery.
-
-//  Float State - As the battery charges it's voltage rises. When it gets to the MAX_BAT_VOLTS we are done with the 
-//      bulk battery charging and enter the battery float state. In this state we try and keep the battery voltage
-//      at MAX_BAT_VOLTS by adjusting the pwm value. If we get to pwm = 100% it means we can't keep the battery 
-//      voltage at MAX_BAT_VOLTS which probably means the battery is being drawn down by some load so we need to back
-//      into the bulk charging mode.
-
-//  Off State - This is state that the charger enters when solar watts < MIN_SOL_WATTS. The charger goes into this
-//      state when there is no more power being generated by the solar panels. The MOSFETs are turned
-//      off in this state so that power from the battery doesn't leak back into the solar panel. 
-//------------------------------------------------------------------------------------------------------
-void run_charger(void) {
-  
-  static int off_count = OFF_NUM;
-
-  switch (charger_state) {
-    case on:                                        
-      if (sol_watts < MIN_SOL_WATTS) {                      // if watts input from the solar panel is less than
-        charger_state = off;                                // the minimum solar watts then 
-        off_count = OFF_NUM;                                // go to the charger off state
-        TURN_OFF_MOSFETS; 
-      }
-      else if (bat_volts > (BATT_FLOAT - 0.1)) {            // else if the battery voltage has gotten above the float
-        charger_state = bat_float;                          // battery float voltage go to the charger battery float state
-      }
-      else if (sol_watts < LOW_SOL_WATTS) {                 // else if the solar input watts is less than low solar watts
-        pwm = PWM_MAX;                                      // it means there is not much power being generated by the solar panel
-        set_pwm_duty();			                    // so we just set the pwm = 100% so we can get as much of this power as possible
-      }                                                     // and stay in the charger on state
-      else {                                          
-        pwm = ((bat_volts * 10) / (sol_volts / 10)) + 5;    // else if we are making more power than low solar watts figure out what the pwm
-        charger_state = bulk;                               // value should be and change the charger to bulk state 
-      }
-      break;
-    case bulk:
-      if (sol_watts < MIN_SOL_WATTS) {                      // if watts input from the solar panel is less than
-        charger_state = off;                                // the minimum solar watts then it is getting dark so
-        off_count = OFF_NUM;                                // go to the charger off state
-        TURN_OFF_MOSFETS; 
-      }
-      else if (bat_volts > BATT_FLOAT) {                 // else if the battery voltage has gotten above the float
-        charger_state = bat_float;                          // battery float voltage go to the charger battery float state
-      }
-      else if (sol_watts < LOW_SOL_WATTS) {                 // else if the solar input watts is less than low solar watts
-        charger_state = on;                                 // it means there is not much power being generated by the solar panel
-        TURN_ON_MOSFETS;                                    // so go to charger on state
-      }
-      else {                                                // this is where we do the Peak Power Tracking ro Maximum Power Point algorithm
-        if (old_sol_watts >= sol_watts) {                   // if previous watts are greater change the value of
-          delta = -delta;			            // delta to make pwm increase or decrease to maximize watts
-        }
-        pwm += delta;                                       // add delta to change PWM duty cycle for PPT algorythm (compound addition)
-        old_sol_watts = sol_watts;                          // load old_watts with current watts value for next time
-        set_pwm_duty();				            // set pwm duty cycle to pwm value
-      }
-      break;
-    case bat_float:
-
-      if (sol_watts < MIN_SOL_WATTS) {                      // if watts input from the solar panel is less than
-        charger_state = off;                                // the minimum solar watts then it is getting dark so
-        off_count = OFF_NUM;                                // go to the charger off state
-        TURN_OFF_MOSFETS; 
-        set_pwm_duty();					
-      }
-      else if (bat_volts > BATT_FLOAT) {                    // If we've charged the battery abovethe float voltage                
-        TURN_OFF_MOSFETS;                                   // turn off MOSFETs instead of modiflying duty cycle
-        pwm = PWM_MAX;                                      // the charger is less efficient at 99% duty cycle
-        set_pwm_duty();                                     // write the PWM
-      }
-      else if (bat_volts < BATT_FLOAT) {                    // else if the battery voltage is less than the float voltage - 0.1
-        pwm = PWM_MAX;                                      
-        set_pwm_duty();	                                    // start charging again
-        TURN_ON_MOSFETS; 		
-        if (bat_volts < (BATT_FLOAT - 0.1)) {               // if the voltage drops because of added load,
-        charger_state = bulk;                               // switch back into bulk state to keep the voltage up
-        }
-      }
-      break;
-    case off:                                               // when we jump into the charger off state, off_count is set with OFF_NUM
-      TURN_OFF_MOSFETS;
-      if (off_count > 0) {                                  // this means that we run through the off state OFF_NUM of times with out doing
-        off_count--;                                        // anything, this is to allow the battery voltage to settle down to see if the  
-      }                                                     // battery has been disconnected
-      else if ((bat_volts > BATT_FLOAT) && (sol_volts > bat_volts)) {
-        TURN_ON_MOSFETS;
-        charger_state = bat_float;                          // if battery voltage is still high and solar volts are high
-      }    
-      else if ((bat_volts > MIN_BAT_VOLTS) && (bat_volts < BATT_FLOAT) && (sol_volts > bat_volts)) {
-        TURN_ON_MOSFETS;
-        charger_state = bulk;
-      }
-      break;
-    default:
-      TURN_OFF_MOSFETS; 
-      break;
-  }
-}
-
-//----------------------------------------------------------------------------------------------------------------------
-/////////////////////////////////////////////LOAD CONTROL/////////////////////////////////////////////////////
-//----------------------------------------------------------------------------------------------------------------------  
-  
-void load_control(){
-  if ((sol_watts < MIN_SOL_WATTS) && (bat_volts > LVD)){   // If the panel isn't producing, it's probably night
-    digitalWrite(LOAD_PIN, LOW);                           // turn the load on
-    load_status = 1;                                       // record that the load is on
-  }
-  else{                                                    // If the panel is producing, it's day time
-    digitalWrite(LOAD_PIN, HIGH);                          // turn the load off
-    load_status = 0;                                       // record that the load is off
-  }
-}
-
-//------------------------------------------------------------------------------------------------------
-// This routine prints all the data out to the serial port.
-//------------------------------------------------------------------------------------------------------
-void print_data(void) {
-  
-  Serial.print(seconds,DEC);
-  Serial.print("      ");
-
-  Serial.print("Charging = ");
-  if (charger_state == on) Serial.print("on   ");
-  else if (charger_state == off) Serial.print("off  ");
-  else if (charger_state == bulk) Serial.print("bulk ");
-  else if (charger_state == bat_float) Serial.print("float");
-  Serial.print("      ");
-
-  Serial.print("pwm = ");
-  Serial.print(pwm,DEC);
-  Serial.print("      ");
-
-  Serial.print("Current (panel) = ");
-  Serial.print(sol_amps);
-  Serial.print("      ");
-
-  Serial.print("Voltage (panel) = ");
-  Serial.print(sol_volts);
-  Serial.print("      ");
-
-  Serial.print("Power (panel) = ");
-  Serial.print(sol_volts);
-  Serial.print("      ");
-
-  Serial.print("Battery Voltage = ");
-  Serial.print(bat_volts);
-  Serial.print("      ");
-
-  Serial.print("\n\r");
-  //delay(1000);
-}
-
-//-------------------------------------------------------------------------------------------------
-//---------------------------------Led Indication--------------------------------------------------
-//-------------------------------------------------------------------------------------------------
-
-void led_output(void)
-{
-  if(bat_volts > 14.1 )
-  {
-      leds_off_all();
-      digitalWrite(LED_YELLOW, HIGH); 
-  } 
-  else if(bat_volts > 11.9 && bat_volts < 14.1)
-  {
-      leds_off_all();
-      digitalWrite(LED_GREEN, HIGH);
-  } 
-  else if(bat_volts < 11.8)
-  {
-      leds_off_all;
-      digitalWrite(LED_RED, HIGH); 
-  } 
-  
-}
-
-//------------------------------------------------------------------------------------------------------
-//
-// This function is used to turn all the leds off
-//
-//------------------------------------------------------------------------------------------------------
-void leds_off_all(void)
-{
-  digitalWrite(LED_GREEN, LOW);
-  digitalWrite(LED_RED, LOW);
-  digitalWrite(LED_YELLOW, LOW);
-}
-
-//------------------------------------------------------------------------------------------------------
-//-------------------------- LCD DISPLAY --------------------------------------------------------------
-//-------------------------------------------------------------------------------------------------------
-void lcd_display()
-{
-  back_light_pin_State = digitalRead(BACK_LIGHT_PIN);
-  if (back_light_pin_State == HIGH)
-  {
-    time = millis();                        // If any of the buttons are pressed, save the time in millis to "time"
-  }
- 
- lcd.setCursor(0, 0);
- lcd.print("SOL");
- lcd.setCursor(4, 0);
- lcd.write(1);
- lcd.setCursor(0, 1);
- lcd.print(sol_volts);
- lcd.print("V"); 
- lcd.setCursor(0, 2);
- lcd.print(sol_amps);
- lcd.print("A");  
- lcd.setCursor(0, 3);
- lcd.print(sol_watts);
- lcd.print("W "); 
- lcd.setCursor(8, 0);
- lcd.print("BAT");
- lcd.setCursor(12, 0);
- lcd.write(2);
- lcd.setCursor(8, 1);
- lcd.print(bat_volts);
- lcd.setCursor(8,2);
- 
- if (charger_state == on) 
- {
- lcd.print("     ");  
- lcd.setCursor(8,2);
- lcd.print("on");
- }
- else if (charger_state == off)
- {
- lcd.print("     ");
- lcd.setCursor(8,2);
- lcd.print("off");
- }
- else if (charger_state == bulk)
- {
- lcd.print("     ");
- lcd.setCursor(8,2);
- lcd.print("bulk");
- }
- else if (charger_state == bat_float)
- {
- lcd.print("     ");
- lcd.setCursor(8,2);
- lcd.print("float");
- }
- 
- //-----------------------------------------------------------
- //--------------------Battery State Of Charge ---------------
- //-----------------------------------------------------------
- lcd.setCursor(8,3);
- if ( bat_volts >= 12.7)
- lcd.print( "100%");
- else if (bat_volts >= 12.5 && bat_volts < 12.7)
- lcd.print( "90%");
- else if (bat_volts >= 12.42 && bat_volts < 12.5)
- lcd.print( "80%");
- else if (bat_volts >= 12.32 && bat_volts < 12.42)
- lcd.print( "70%");
- else if (bat_volts >= 12.2 && bat_volts < 12.32)
- lcd.print( "60%");
- else if (bat_volts >= 12.06 && bat_volts < 12.2)
- lcd.print( "50%");
- else if (bat_volts >= 11.90 && bat_volts < 12.06)
- lcd.print( "40%");
- else if (bat_volts >= 11.75 && bat_volts < 11.90)
- lcd.print( "30%");
- else if (bat_volts >= 11.58 && bat_volts < 11.75)
- lcd.print( "20%");
- else if (bat_volts >= 11.31 && bat_volts < 11.58)
- lcd.print( "10%");
- else if (bat_volts < 11.3)
- lcd.print( "0%");
- 
-//--------------------------------------------------------------------- 
-//------------------Duty Cycle-----------------------------------------
-//---------------------------------------------------------------------
- lcd.setCursor(15,0);
- lcd.print("PWM");
- lcd.setCursor(19,0);
- lcd.write(3);
- lcd.setCursor(15,1);
- lcd.print("   ");
- lcd.setCursor(15,1);
- lcd.print(pwm); 
- lcd.print("%");
- //----------------------------------------------------------------------
- //------------------------Load Status-----------------------------------
- //----------------------------------------------------------------------
- lcd.setCursor(15,2);
- lcd.print("Load");
- lcd.setCursor(15,3);
- if (load_status == 1)
- {  
-   lcd.print("   ");
-    lcd.setCursor(15,3);
-    lcd.print("On");
- }
- else
- { 
-   lcd.print("   ");
-   lcd.setCursor(15,3);
-   lcd.print("Off");
- }
- backLight_timer();                      // call the backlight timer function in every loop 
-}
-
-void backLight_timer(){
-  if((millis() - time) <= 15000)         // if it's been less than the 15 secs, turn the backlight on
-      lcd.backlight();                   // finish with backlight on  
-  else 
-      lcd.noBacklight();                 // if it's been more than 15 secs, turn the backlight off
-}

MPPT_Code_ESP8266/MPPT_Code_ESP8266.ino

@@ -54,7 +54,13 @@
 ///////// Definitions /////////////////////////////////////////////////////////////////////////////////////////////////
 
 
-#define ENABLE_DATALOGGER 0
+// Turn this on to use the ESP8266 chip. If you set this to 0, the periodic updates will not happen
+#define ENABLE_DATALOGGER 1
+
+// Load control algorithm
+// 0 - NIGHT LIGHT: Load ON when there is no solar power and battery is above LVD (low voltage disconnect)
+// 1 - POWER DUMP: Load ON when there is solar power and the battery is above BATT_FLOAT (charged)
+#define LOAD_ALGORITHM 0
 
 #define SOL_AMPS_CHAN 1                // Defining the adc channel to read solar amps
 #define SOL_VOLTS_CHAN 0               // defining the adc channel to read solar volts
@@ -121,31 +127,82 @@ SoftwareSerial ser(2,3); // RX, TX
 //------------------------------------------------------------------------------------------------------
 /////////////////////////////////////////BIT MAP ARRAY//////////////////////////////////////////////////
 //-------------------------------------------------------------------------------------------------------
-byte solar[8] = //icon for termometer
+
+byte battery_icons[6][8]=
+{{
+  0b01110,
+  0b11011,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b11111,
+},
 {
+  0b01110,
+  0b11011,
+  0b10001,
+  0b10001,
+  0b10001,
+  0b10001,
   0b11111,
-  0b10101,
   0b11111,
-  0b10101,
+},
+{
+  0b01110,
+  0b11011,
+  0b10001,
+  0b10001,
+  0b10001,
   0b11111,
-  0b10101,
   0b11111,
-  0b00000
-};
-
-byte battery[8]=
+  0b11111,
+},
 {
   0b01110,
   0b11011,
   0b10001,
-  0b10001,
   0b11111,
   0b11111,
   0b11111,
   0b11111,
+  0b11111,
+},
+{
+  0b01110,
+  0b11011,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+},
+{
+  0b01110,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+  0b11111,
+}};
+#define SOLAR_ICON 6
+byte solar_icon[8] = //icon for termometer
+{
+  0b11111,
+  0b10101,
+  0b11111,
+  0b10101,
+  0b11111,
+  0b10101,
+  0b11111,
+  0b00000
 };
-
-byte _PWM [8]=
+#define PWM_ICON 7
+byte _PWM_icon[8]=
 {
   0b11101,
   0b10101,
@@ -156,6 +213,16 @@ byte _PWM [8]=
   0b10101,
   0b10111,
 };
+byte backslash_char[8] {
+  0b10000,
+  0b10000,
+  0b01000,
+  0b01000,
+  0b00100,
+  0b00100,
+  0b00010,
+  0b00010,
+};
 //-------------------------------------------------------------------------------------------------------
 
 // global variables
@@ -172,7 +239,7 @@ unsigned long time = 0;               // variable to store time the back light c
 int delta = PWM_INC;                  // variable used to modify pwm duty cycle for the ppt algorithm
 int pwm = 0;                          // pwm duty cycle 0-100%
 int back_light_pin_State = 0;         // variable for storing the state of the backlight button
-int load_status = 0;                  // variable for storing the load output state (for writing to LCD)
+boolean load_status = false;                  // variable for storing the load output state (for writing to LCD)
   
 enum charger_mode {off, on, bulk, bat_float} charger_state;    // enumerated variable that holds state for charger state machine
 // set the LCD address to 0x27 for a 20 chars 4 line display
@@ -190,11 +257,18 @@ void setup()                           // run once, when the sketch starts
   pinMode(PWM_ENABLE_PIN, OUTPUT);     // sets the digital pin as output
   TURN_OFF_MOSFETS;                    // turn off MOSFET driver chip
   charger_state = off;                 // start with charger state as off
+
   lcd.begin(20,4);   // initialize the lcd for 16 chars 2 lines, turn on backlight
+
+  // create the LCD special characters. Characters 0-5 are the various battery fullness icons
+  // icon 7 is for the PWM icon, and icon 8 is for the solar array
   lcd.backlight();
-  lcd.createChar(1,solar);
-  lcd.createChar(2,battery);
-  lcd.createChar(3,_PWM);
+  for (int batchar = 0; batchar < 6; ++batchar) {
+    lcd.createChar(batchar, battery_icons[batchar]);
+  }
+  lcd.createChar(PWM_ICON,_PWM_icon);
+  lcd.createChar(SOLAR_ICON,solar_icon);
+  lcd.createChar('\\', backslash_char);
   pinMode(LED_RED, OUTPUT);
   pinMode(LED_GREEN, OUTPUT);
   pinMode(LED_YELLOW, OUTPUT);
@@ -214,17 +288,15 @@ void setup()                           // run once, when the sketch starts
   lcd.setCursor(0, 0);
   lcd.print("SOL");
   lcd.setCursor(4, 0);
-  lcd.write(1);
+  lcd.write(SOLAR_ICON);
   lcd.setCursor(8, 0);
   lcd.print("BAT");
-  lcd.setCursor(12, 0);
-  lcd.write(2);
 }
 
 //------------------------------------------------------------------------------------------------------
 // Main loop
 //------------------------------------------------------------------------------------------------------
-void loop()                         
+void loop()
 {
   read_data();                         // read data from inputs
   run_charger();                       // run the charger state machine
@@ -232,11 +304,11 @@ void loop()
   load_control();                      // control the connected load
   led_output();                        // led indication
   lcd_display();                       // lcd display
+#if ENABLE_DATALOGGER
   wifi_datalog();                    // sends data to thingspeak
-  
+#endif
 }
 
-
 //------------------------------------------------------------------------------------------------------
 // This routine reads and averages the analog inputs for this system, solar volts, solar amps and 
 // battery volts. 
@@ -397,9 +469,11 @@ void run_charger(void) {
       }                                                     // battery has been disconnected
       else if ((bat_volts > BATT_FLOAT) && (sol_volts > bat_volts)) {
         charger_state = bat_float;                          // if battery voltage is still high and solar volts are high
+        TURN_ON_MOSFETS;
       }    
       else if ((bat_volts > MIN_BAT_VOLTS) && (bat_volts < BATT_FLOAT) && (sol_volts > bat_volts)) {
         charger_state = bulk;
+        TURN_ON_MOSFETS;
       }
       break;
     default:
@@ -411,15 +485,22 @@ void run_charger(void) {
 //----------------------------------------------------------------------------------------------------------------------
 /////////////////////////////////////////////LOAD CONTROL/////////////////////////////////////////////////////
 //----------------------------------------------------------------------------------------------------------------------  
-  
+
 void load_control(){
-  if ((sol_watts < MIN_SOL_WATTS) && (bat_volts > LVD)){   // If the panel isn't producing, it's probably night
-    digitalWrite(LOAD_PIN, LOW);                           // turn the load on
-    load_status = 1;                                       // record that the load is on
-  }
-  else{                                                    // If the panel is producing, it's day time
-    digitalWrite(LOAD_PIN, HIGH);                          // turn the load off
-    load_status = 0;                                       // record that the load is off
+#if LOAD_ALGORITHM == 0
+  // turn on loads at night when the solar panel is not producing power
+  // as long as the battery voltage is above LVD
+  load_on(sol_watts < MIN_SOL_WATTS && bat_volts > LVD);
+#else
+  // dump excess solar energy into the load circuit
+  load_on(sol_watts > MIN_SOL_WATTS && bat_volts > BATT_FLOAT);
+#endif
+}
+
+void load_on(boolean new_status) {
+  if (load_status != new_status) {
+    load_status = new_status;
+    digitalWrite(LOAD_PIN, new_status ? HIGH : LOW);
   }
 }
 
@@ -541,12 +622,16 @@ void lcd_display()
  //-----------------------------------------------------------
  //--------------------Battery State Of Charge ---------------
  //-----------------------------------------------------------
- lcd.setCursor(8,3);
  int pct = 100.0*(bat_volts - 11.3)/(12.7 - 11.3);
  if (pct < 0)
      pct = 0;
  else if (pct > 100)
      pct = 100;
+
+ lcd.setCursor(12,0);
+ lcd.print((char)(pct*5/100));
+
+ lcd.setCursor(8,3);
  pct = pct - (pct%10);
  lcd.print(pct);
  lcd.print("%  ");
@@ -557,19 +642,19 @@ void lcd_display()
  lcd.setCursor(15,0);
  lcd.print("PWM");
  lcd.setCursor(19,0);
- lcd.write(3);
+ lcd.write(PWM_ICON);
  lcd.setCursor(15,1);
  lcd.print("   ");
  lcd.setCursor(15,1);
  lcd.print(pwm); 
- lcd.print("%");
+ lcd.print("% ");
  //----------------------------------------------------------------------
  //------------------------Load Status-----------------------------------
  //----------------------------------------------------------------------
  lcd.setCursor(15,2);
  lcd.print("Load");
  lcd.setCursor(15,3);
- if (load_status == 1)
+ if (load_status)
  {
     lcd.print("On  ");
  }
@@ -585,15 +670,13 @@ void backLight_timer(){
   if((millis() - time) <= 15000)         // if it's been less than the 15 secs, turn the backlight on
       lcd.backlight();                   // finish with backlight on  
   else 
-      lcd.noBacklight();                 // if it's been more than 15 secs, turn the backlight off 
-      
-
+      lcd.noBacklight();                 // if it's been more than 15 secs, turn the backlight off
 }
 void spinner(void) {
   static int cspinner;
-  static char spinner_chars[] = { '/','-','\\','|' };
+  static char spinner_chars[] = { '*','*', '*', ' ', ' '};
   cspinner++;
-  lcd.print(spinner_chars[cspinner%4]);
+  lcd.print(spinner_chars[cspinner%sizeof(spinner_chars)]);
 }
 
 //-------------------------------------------------------------------------