solar_charger/soler_chager.ino

  #include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <dht11.h>
#include <BH1750.h>
#include <Servo.h>

#define DHT11_PIN 7
#define photoL1 A0
#define photoL2 A1
#define photoL3 A2
#define photoL4 A3
#define LED 3
#define button 2
#define buzzer 6
#define circleServoPin 9
#define tiltServoPin 10
#define LED 3//define the pin of LED as D10

BH1750 lightMeter;
dht11 DHT;
volatile int buttonState;
volatile int lightReadL1 = 0;
volatile int lightReadL2 = 0;
volatile int lightReadL3 = 0;
volatile int lightReadL4 = 0;
int value;
int servoPin = 9;//set the pin of the servo
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo circleServo;
Servo tiltServo;

void setup()
{
  Serial.begin(9600);
  Serial.println("");
  Serial.print("setting up!\n");

  Serial.print("init lcd\n");
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.printstr("setting up!");
  //lcd.setCursor(0,1);
  //lcd.printstr("hey,human!");

  pinMode(LED, OUTPUT); //initialize digital pin LED as an output.
  pinMode(button, INPUT);
  pinMode(buzzer, OUTPUT);
  //circleServo.attach(circleServoPin);
  //tiltServo.attach(tiltServoPin);

  Serial.print("done setting up!\n");
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.printstr("done");

  //Intialize the 12C bus
  Wire.begin();
  //On esp8266 you can select SCL and SDA pins using Wire.begin
  //For Wemos /Lolin D1 Mini Pro and the Ambient Light shield use
  lightMeter.begin();
  Serial.println(F("BH1750 Test begin"));
}

void loop()
{
  /*
  delay(300);
  for (int i = 180; i > 0; i--) {
    circleServo.write(i);
    tiltServo.write(i);
    delay(10);
  }
  for (int i = 0; i < 180; i++) {
    circleServo.write(i);
    tiltServo.write(i);
    delay(10);
  }
  */

  /*
    servopulse(servoPin, 0);//rotate to 0 degree
    delay(200);//delay in 1s
    servopulse(servoPin, 90);//rotate to 90 degrees
    delay(200);
    servopulse(servoPin, 180);//rotate to 1800 degrees
    delay(200);

    if (lightReadL1 > 300){
    digitalWrite(LED, HIGH);
  }
  else{
    digitalWrite(LED, LOW);
  }
  */

  int chk;
  chk = DHT.read(DHT11_PIN);
  switch (chk)
  {
    case DHTLIB_OK:
      break;
    case DHTLIB_ERROR_CHECKSUM:
      Serial.println("[ERR] dht11 checksum");
      break;
    case DHTLIB_ERROR_TIMEOUT:
      Serial.println("[ERR] dht11 timeout");
      break;
    default:
      break;
  }

  float lux = lightMeter.readLightLevel();
  lightReadL1 = analogRead(photoL1);
  lightReadL2 = analogRead(photoL2);
  lightReadL3 = analogRead(photoL3);
  lightReadL4 = analogRead(photoL4);
  {
    char buf[40];
    char lStr[6];
    dtostrf(lux, 4, 2, lStr);  // https://forum.arduino.cc/t/sprintf-with-float-values/937562
    sprintf(buf, "h: %d%%, t: %dF, l: %s, ", DHT.humidity, CtoF(DHT.temperature), lStr);
    Serial.print(buf);

    sprintf(buf, "L1: %d, L2: %d, L3: %d, L4: %d", lightReadL1, lightReadL2, lightReadL3, lightReadL4);
    Serial.println(buf);

    lcd.clear();
    // the LCD has two rows and 17 columns ...
    sprintf(buf, "h:%d,t:%d,l:%s", DHT.humidity, CtoF(DHT.temperature), lStr);
    lcd.setCursor(0,0);
    lcd.printstr(buf);

    sprintf(buf, "%d,%d,%d,%d", lightReadL1, lightReadL2, lightReadL3, lightReadL4);
    lcd.setCursor(0,1);
    lcd.printstr(buf);
  }
  delay(2000);

   /*
  {
    Serial.print("hum: ");
    Serial.print(DHT.humidity);
    Serial.print(",  temp: ");
    Serial.print(CtoF(DHT.temperature));
    Serial.print(",  L1: ");
    Serial.print(lightReadL1);
    Serial.print(",  L2: ");
    Serial.print(lightReadL2);
    Serial.print(",  L3: ");
    Serial.print(lightReadL3);
    Serial.print(",  L4: ");
    Serial.print(lightReadL4);
    Serial.print(",  lx:  ");
    Serial.println(lux);
    delay(500);
  }
  */

  buttonState = digitalRead(button);
  if(buttonState == 0) {
    for(value = 0; value < 255; value +1){
      analogWrite (LED, value);//LED lights gradually light up
    }
    } else {
    digitalWrite(LED, LOW);
    value = 0;
  }
}

int CtoF(int temp)
{
  return temp * 1.8 + 32;
}

int FtoC(int temp)
{
  return (temp - 32) * 0.55555;
}

void blink()
{
  digitalWrite(LED,HIGH);  //turn the LED on (HIGH is the voltage level
  delay(1000);  //wait for a second
  digitalWrite(LED,LOW);  //turn the LED off by making the voltage LOW
  delay(1000);  //wait for a second
}