问个问题 卡你看
最近在用arduino 弄一个三轴磁场的程序，弄出来后有三个值如x=126，y=125z=58，我想反映出磁场的变化就把他合并为x2+y2+z2再开根号，但是这样发现 合并为一个结果反映的时候，变化相当的大，我想问下能不能有x轴现在的数字与x轴0.5秒前的数值相减，根据变化量来做出点亮led灯的控制（同轴变化量），谢谢
以前的老大妈是这个#include <Wire.h> //I2C Arduino Library
#define address 0x1E //0011110b, I2C 7bit address of HMC5883
int ledPin = 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
}
baa=sq(x) + sq(y)+ sq(z) ;
all=sqrt(baa);
if(all>190){
digitalWrite(13,HIGH);
Serial.print("abs(all): ");
Serial.print(abs(all));
delay(5000);
}
else
digitalWrite(13,LOW);
Serial.print("abs(all): ");
Serial.print(abs(all));
delay(5000);
}
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