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arduino 用hmc5883l 磁场传感器，接线A4 和A5 后，编程序，用led 13灯来点亮，但是实实验中，当模拟数字符合点亮的条件的时候，为什么外接在13号引脚的led灯不会亮呢，而且有时候是处于微微亮的状态（一直微亮），代码如下#include <Wire.h> //I2C Arduino Library
#define address 0x1E //0011110b, I2C 7bit address of HMC5883
int ledPin1 = 13;
void setup(){
//Initialize Serial and I2C communications
Serial.begin(9600);
Wire.begin();
//Put the HMC5883 IC into the correct operating mode
Wire.beginTransmission(address); //open communication with HMC5883
Wire.write(0x02); //select mode register
Wire.write(0x00); //continuous measurement mode
Wire.endTransmission();
}
void loop(){
int x,y,z,baa,all; //triple axis data
//Tell the HMC5883 where to begin reading data
Wire.beginTransmission(address);
Wire.write(0x03); //select register 3, X MSB register
Wire.endTransmission();
//Read data from each axis, 2 registers per axis
Wire.requestFrom(address, 6);
if(6<=Wire.available()){
x = Wire.read()<<8; //X msb
x |= Wire.read(); //X lsb
z = Wire.read()<<8; //Z msb
z |= Wire.read(); //Z lsb
y = Wire.read()<<8; //Y msb
y |= Wire.read(); //Y lsb
}
all=x+y+z;
if(all> 800)// 设置数值大于800{
digitalWrite(ledPin1,HIGH);
Serial.print("abs(all): ");
Serial.print(abs(all));
delay(5000);
}
else
digitalWrite(ledPin1,LOW);
Serial.print("abs(all): ");
Serial.print(abs(all));
delay(5000);
}
问题：当all的值已经达到1200的时候（已经大于800啦），为什么led13灯不会亮呢？？？？？？？？？？？[/size] 为什么没有回答的 你把low和high互换试试？
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