<分区>
我使用带有 arduino 的 BH1750 光传感器在 LCD 上显示勒克斯值。但是在代码中，我无法获得公式。谁能给我解释一下公式？
我试图在 BH1750 的数据表中找到它，但我无法理解这一行:
value = ((buff[0]<<8)|buff[1])/1.2;
完整代码:
#include<Wire.h>
#include<LiquidCrystal.h>
int BH1750address = 0x23;
byte buff[2];
LiquidCrystal lcd (7,6,5,4,3,2); //RS, E, D4, D5, D6, D7
void setup()
{
Wire.begin();
lcd.begin(16,2);
lcd.print(" BH1750 Light ");
lcd.setCursor(0,1);
lcd.print("Intensity Sensor");
delay(2000);
}
void loop()
{
int i;
uint16_t value=0;
BH1750_Init(BH1750address);
delay(200);
if(2==BH1750_Read(BH1750address))
{
value=((buff[0]<<8)|buff[1])/1.2; //This is where the problem is
lcd.clear();
lcd.print("Intensity in LUX");
lcd.setCursor(6,1);
lcd.print(value);
}
delay(150);
}
int BH1750_Read(int address)
{
int i=0;
Wire.beginTransmission(address);
Wire.requestFrom(address, 2);
while(Wire.available())
{
buff[i] = Wire.read();
i++;
}
Wire.endTransmission();
return i;
}
void BH1750_Init(int address)
{
Wire.beginTransmission(address);
Wire.write(0x10);
Wire.endTransmission();
}