Arduino + SHT1X 制作温度、湿度传感系统

发布于: 27 January, 2014
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通过Arduino和SHT1X传感器,实现实时监测环境温度和湿度的简单而有效的方案。文章提供电路连接和示例代码,帮助您快速构建自己的温湿度监测系统。

代码

int SHT_clockPin = 3;  // pin used for clock
int SHT_dataPin  = 2;  // pin used for data

void setup() { Serial.begin(9600); // open serial at 9600 bps }

void loop() { //these can take a bit to get the values (100ms or so) float temperature = getTemperature(); float humidity = getHumidity();

Serial.print(temperature);
Serial.print(" | ");
Serial.println(humidity);

}

float getTemperature() { //Return Temperature in Celsius SHT_sendCommand(B00000011, SHT_dataPin, SHT_clockPin); SHT_waitForResult(SHT_dataPin); int val = SHT_getData(SHT_dataPin, SHT_clockPin); SHT_skipCrc(SHT_dataPin, SHT_clockPin); return (float)val * 0.01 - 40; //convert to celsius }

float getHumidity() { //Return Relative Humidity SHT_sendCommand(B00000101, SHT_dataPin, SHT_clockPin); SHT_waitForResult(SHT_dataPin); int val = SHT_getData(SHT_dataPin, SHT_clockPin); SHT_skipCrc(SHT_dataPin, SHT_clockPin); return -4.0 + 0.0405 * val + -0.0000028 * val * val; }

void SHT_sendCommand(int command, int dataPin, int clockPin) { // send a command to the SHTx sensor // transmission start pinMode(dataPin, OUTPUT); pinMode(clockPin, OUTPUT); digitalWrite(dataPin, HIGH); digitalWrite(clockPin, HIGH); digitalWrite(dataPin, LOW); digitalWrite(clockPin, LOW); digitalWrite(clockPin, HIGH); digitalWrite(dataPin, HIGH); digitalWrite(clockPin, LOW);

// shift out the command (the 3 MSB are address and must be 000, the last 5 bits are the command) shiftOut(dataPin, clockPin, MSBFIRST, command);

// verify we get the right ACK digitalWrite(clockPin, HIGH); pinMode(dataPin, INPUT);

if (digitalRead(dataPin)) Serial.println("ACK error 0"); digitalWrite(clockPin, LOW); if (!digitalRead(dataPin)) Serial.println("ACK error 1"); }

void SHT_waitForResult(int dataPin) { // wait for the SHTx answer pinMode(dataPin, INPUT);

int ack; //acknowledgement

//need to wait up to 2 seconds for the value for (int i = 0; i < 1000; ++i) { delay(2); ack = digitalRead(dataPin); if (ack == LOW) break; }

if (ack == HIGH) Serial.println("ACK error 2"); }

int SHT_getData(int dataPin, int clockPin) { // get data from the SHTx sensor

// get the MSB (most significant bits) pinMode(dataPin, INPUT); pinMode(clockPin, OUTPUT); byte MSB = shiftIn(dataPin, clockPin, MSBFIRST);

// send the required ACK pinMode(dataPin, OUTPUT); digitalWrite(dataPin, HIGH); digitalWrite(dataPin, LOW); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW);

// get the LSB (less significant bits) pinMode(dataPin, INPUT); byte LSB = shiftIn(dataPin, clockPin, MSBFIRST); return ((MSB << 8) | LSB); //combine bits }

void SHT_skipCrc(int dataPin, int clockPin) { // skip CRC data from the SHTx sensor pinMode(dataPin, OUTPUT); pinMode(clockPin, OUTPUT); digitalWrite(dataPin, HIGH); digitalWrite(clockPin, HIGH); digitalWrite(clockPin, LOW); }

总结

 

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