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LCD 20x4 with I2C Pin Use to WeMos D1 R2

PIN LCD	Type	Pin WeMos D1 R2
SDA	Communication Serial	SDA
SCL	Communication Serial	SCL
GND	Ground	GND
5V	VCC	5V

pH Sensor pH-4502C Pin Use to WeMos D1 R2

PIN pH-4502C	Type	Pin WeMos D1 R2
DATA	Communication	A0
GND	Ground	GND
5V	VCC	5V

Water Level Sensor XKC-Y25-V Pin Use to WeMos D1 R2

PIN XKC-Y25-V	Type	Pin WeMos D1 R2
DATA	Communication	D7
GND	Ground	GND
5V	VCC	5V

LED Pin Use to WeMos D1 R2

PIN LED	Type	Pin WeMos D1 R2
DATA	Communication	D8
GND	Ground	GND
5V	VCC	5V

Relay Pin Use to WeMos D1 R2

PIN RELAY	Type	Pin WeMos D1 R2
IN1	Communication	D6
IN2	Communication	D5
IN3	Communication	D4
IN4	Communication	D3
GND	Ground	GND
5V	VCC	5V

Pin Use to WeMos D1 R2

PIN WeMos D1 R2	Type	Pin WeMos D1 R2
Pin LED	DATA	D8
D2	DATA	D7
D1	DATA	*
D0	DATA	D3
*	DATA	D4
A0	DATA	D5
*	DATA	D6

Rumus pH Sensor pH-4502C

// pH sensor
float calibration = 30.00; //21.42 - change this value to calibrate
const int analogInPin = A0; 
int sensorValue = 0; 
unsigned long int avgValue; 
float b;
int buf[10],temp;
float phValueFinal;

void pHsensor() {
  for(int i=0;i<10;i++) 
 { 
 buf[i]=analogRead(analogInPin);
 delay(30);
 }
 for(int i=0;i<9;i++)
 {
 for(int j=i+1;j<10;j++)
 {
 if(buf[i]>buf[j])
 {
 temp=buf[i];
 buf[i]=buf[j];
 buf[j]=temp;
 }
 }
   }
 avgValue=0;
 for(int i=2;i<8;i++)
 avgValue+=buf[i];
 float pHVol=(float)avgValue*5.0/1024/6;
 float phValue = -5.70 * pHVol + calibration;
 phValueFinal = phValue;
 Serial.print("pH: ");
 Serial.println(phValue);
}