Electricimp + MS5607 氣壓感測器

按照下圖將做好的HTU-21+MS5607感測器與electricimp接好。



將程式碼放至Device頁框中。(I2C的速度不要選400KHz，可能會讀不到氣壓計的值)

	class MS5607 {
	_i2c = null;
	static PADDR = 0xec;
	static READD1 = "\x48";
	static READD2 = "\x58";
	static READADC = "\x00";
	static READCAL = "\xa2";
	static C = array(8);
	constructor(i2c) {
	_i2c = i2c;
	_i2c.configure(CLOCK_SPEED_100_KHZ);
	}
	function GetTemp() {
	_i2c.write(PADDR, READD2);
	imp.sleep(0.05);
	_i2c.write(PADDR, READADC);
	imp.sleep(0.05);
	local a = _i2c.read((PADDR+1), "", 3);
	local D2=a[0]*65536 + a[1]*256 + a[2];
	//server.log(C[5]);
	local dT = D2 - (C[5]*256);
	//server.log(dT);
	local Temp = dT * (C[6].tofloat()/128);
	//server.log(Temp);
	Temp =(Temp /65536) + 2000;
	//server.log(format("Temp: %d %d %d %d",a[0],a[1],a[2],Temp));
	return Temp/100;
	}
	function GetPress() {
	_i2c.write(PADDR, READD2);
	imp.sleep(0.05);
	_i2c.write(PADDR, READADC);
	imp.sleep(0.05);
	local a = _i2c.read((PADDR+1), "", 3);
	local D2=a[0]*65536 + a[1]*256 + a[2];
	_i2c.write(PADDR, READD1);
	imp.sleep(0.05);
	_i2c.write(PADDR, READADC);
	imp.sleep(0.05);
	local a = _i2c.read((PADDR+1), "", 3);
	local D1=a[0]*65536 + a[1]*256 + a[2];
	//server.log(D1);
	local dT = D2 - (C[5]*256);
	//server.log(dT);
	local Temp = dT * (C[6].tofloat()/128);
	//server.log(Temp);
	Temp =(Temp /65536) + 2000;
	//以下公式跟原廠不一樣，但目前測試與中央氣局公佈的相當接近。
	local OFF = C[2].tofloat()*65536+dT*C[4].tofloat()/128;
	//server.log(OFF);
	local SENS = C[1].tofloat()*32768+dT*C[3].tofloat()/256;
	//server.log(SENS);
	if(Temp<2000) {
	local T1 = dT * dT /2147483648;
	local OFF1 = 5 * (Temp-2000) *(Temp-2000)/2;
	local SENS1 = 5 * (Temp-2000) *(Temp-2000)/4;
	if ( Temp< -1500) {
	OFF1 = OFF1 + 7 * (Temp+1500) * (Temp+1500);
	SENS1 = SENS1 + 11 * (Temp+1500) * (Temp+1500)/2;
	}
	TEMP-=T1;
	OFF-=OFF1;
	SENS-=SENS1;
	}
	local Press = (D1.tofloat()*SENS/(65536*32)-OFF)/16384;
	//server.log(format("Press: %d %d %d %d",a[0],a[1],a[2],Press));
	return Press/100;
	}
	function GetCal() {
	local i,t,s;
	for (i=0; i<8 ; i++) {
	t=0xa0+(i*2);
	s=t.tochar();
	_i2c.write(PADDR,s);
	imp.sleep(0.05);
	local a = _i2c.read((PADDR+1), "", 2);
	//server.log(a);
	C[i]=a[0]*256+a[1];
	//server.log( format("%d %d %d %d",i, a[0],a[1],C[i]));
	}
	}
	}
	pSensor<-MS5607(hardware.i2c89);
	pSensor.GetCal(); //讀取校正值
	server.log(pSensor.GetTemp());
	server.log(pSensor.GetPress());

view raw MS5607.device.nut hosted with ❤ by GitHub

按下



應該可以在 Device logs 頁看到氣壓與溫度的訊息。