Scan the state more often

The code previously scanned fairly rarely due to the thingspeak code long delay.
Now it scans every second or so, making adjustments to the PWM more frequent.
This code also adds a spinner so you can verify that it's adjusting things.

MPPT_Code_ESP8266/MPPT_Code_ESP8266.ino

@@ -395,6 +395,7 @@ void loop()
   led_output();                      // led indication
   lcd_display();                    // lcd display
   wifi_datalog();
+  delay(500);
 }
 
 //------------------------------------------------------------------------------------------------------
@@ -551,19 +552,32 @@ void lcd_display()
  lcd.setCursor(15,3);
  if (load_status == 1)
  {
-    lcd.print("On");
+    lcd.print("On  ");
  }
  else
  {
-   lcd.print("Off");
+   lcd.print("Off ");
  } 
+ spinner();
 }
+void spinner(void) {
+  static int cspinner;
+  static char spinner_chars[] = { '/','-','\\','|' };
+  cspinner++;
+  lcd.print(spinner_chars[cspinner%4]);
+}
+
 //-------------------------------------------------------------------------
 //----------------------------- ESP8266 WiFi ------------------------------
 //--------------------------Plot System data on thingspeak.com-------------
 //-------------------------------------------------------------------------
 void wifi_datalog()
 {
+  // thingspeak needs 15 sec delay between updates
+  static int lastlogged;
+  if ( seconds - lastlogged < 16 )
+      return;
+  lastlogged = seconds;
  // convert to string
   char buf[16];
   String strTemp = dtostrf( sol_volts, 4, 1, buf);
@@ -600,8 +614,5 @@ void wifi_datalog()
     ser.println("AT+CIPCLOSE");
     // alert user
     Serial.println("AT+CIPCLOSE");
-  }
-    
-  // thingspeak needs 15 sec delay between updates
-  delay(16000);  
+  } 
 }