#include <Wire.h>
#define BH1750_ADDRESS 0x23

uint16_t lu1;
int rs;

void setup() {
  Serial.begin(115200);
  Wire.begin(2,0);       //PinNo=SDA,SCL   D4=SDA,D3=SCL に設定  ESP-12E

  Wire.beginTransmission(BH1750_ADDRESS);  
  Wire.write(0x42);
  Wire.endTransmission();
  Wire.beginTransmission(BH1750_ADDRESS);  
  Wire.write(0x65);
  Wire.endTransmission();
}

void loop() {
  uint8_t data[4],i=0;
  Wire.beginTransmission(BH1750_ADDRESS);  
  Wire.write(0x10);
  Wire.endTransmission();
  delay(120);
  Wire.requestFrom(BH1750_ADDRESS,2);   
    while(Wire.available()){
    data[i] = Wire.read();
    i++;    
    }
  lu1=(data[0] << 8) | data[1];
  Serial.print("  値=0x");
  Serial.print(lu1,HEX);
  Serial.print("  10進値/1.2=");
  Serial.print(lu1/1.2);
  Serial.println("(lx)");
    delay(5000);
}