#include <Wire.h>

const int Light_ADDR = 0b0100011;   // address:0x23

int tempLight = 0;

void readLight();

void setup() {
   Serial.begin(115200);

  Wire.begin();

  //initialize light sensor
  Wire.beginTransmission(Light_ADDR);
  Wire.write(0b00000001);
  Wire.endTransmission();

}

void loop() {
  readLight();
  delay(5000);
}

void readLight(){
  // reset
  Wire.beginTransmission(Light_ADDR);
  Wire.write(0b00000111);
  Wire.endTransmission();

  Wire.beginTransmission(Light_ADDR);
  Wire.write(0b00100000);
  Wire.endTransmission();
  // typical read delay 120ms
  delay(120);
  Wire.requestFrom(Light_ADDR, 2); // 2byte every time
  for (tempLight = 0; Wire.available() >= 1; ) {
    char c = Wire.read();
    tempLight = (tempLight << 8) + (c & 0xFF);
  }
  tempLight = tempLight / 1.2;
  Serial.print("light: ");
  Serial.println(tempLight);
}