Electricimp + HTU-21 溫度感測器

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)

	//
	// 本程式來源為: boffin @ http://forums.electricimp.com/discussion/2234/htu21d-null-read-out-values/p1
	//
	class HTU21D {
	_i2c = null;
	static ALSADDR = 0x40;
	static READTEMP = "\xe3";
	static READHUMID = "\xe5";
	constructor(i2c) {
	_i2c = i2c;
	_i2c.configure(CLOCK_SPEED_100_KHZ);
	}
	function GetTemp() {
	_i2c.write(ALSADDR<<1, READTEMP);
	imp.sleep(0.05);
	local a = _i2c.read(ALSADDR<<1, "", 3);
	//server.log("A"+a);
	//return 100;
	return (((a[0] << 8) | (a[1] & 0xfc)) * 175.72 / 65536.0) - 46.85
	}
	function GetHumid() {
	_i2c.write(ALSADDR<<1, READHUMID);
	imp.sleep(0.05);
	local b = _i2c.read(ALSADDR<<1, "", 3);
	//local rh = (((b[0] << 8) | (b[1] & 0xf0)) * 120.00 / 65536.0) - 6.00 ;
	return (((b[0] << 8) | (b[1] & 0xf0)) * 125.00 / 65536.0) - 6.00;
	}
	}
	tempSensor <- HTU21D(hardware.i2c89); // 初始化HTU21D
	server.log(tempSensor.GetTemp());
	server.log(tempSensor.GetHumid());

view raw HTU-21.nut hosted with ❤ by GitHub

按下



應該可以在 Device logs 頁框中看到溫濕度的訊息。