STX3x Sensor sample code

ID:311370 · 发表于 2018-4-19 04:51

#include <application.h>
#include <spark_wiring_i2c.h>
// SHT31 I2C address is 0x44(68)
#define Addr 0x44

int temp = 0;
double cTemp = 0.0, fTemp = 0.0, humidity = 0.0;
void setup()
{
  // Set variable
  Particle.variable("i2cdevice", "SHT31");
  Particle.variable("cTemp", cTemp);
  Particle.variable("humidity", humidity);

  // Initialise I2C communication as MASTER
  Wire.begin();
  // Initialise serial communication, set baud rate = 9600
  Serial.begin(9600);
  delay(300);
}

void loop()
{
  unsigned int data[6];

  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Send 16-bit command byte
  Wire.write(0x2C);
  Wire.write(0x06);
  // Stop I2C transmission
  Wire.endTransmission();
  delay(300);

  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select data register
  Wire.write(0x00);
  // Stop I2C Transmission
  Wire.endTransmission();

  // Request 6 bytes of data from the device
  Wire.requestFrom(Addr, 6);

  // Read 6 bytes of data
  // temp msb, temp lsb, crc, hum msb, hum lsb, crc
  if (Wire.available() == 6)
  {
data[0] = Wire.read();
data[1] = Wire.read();
data[2] = Wire.read();
data[3] = Wire.read();
data[4] = Wire.read();
data[5] = Wire.read();
  }

  // Convert the data
  temp = (data[0] * 256) + data[1];
  cTemp = -45.0 + (175.0 * temp / 65535.0);
  fTemp = (cTemp * 1.8) + 32;
  humidity = 100 * ((data[3] * 256) + data[4]) / 65535.0;

  // Output data to dashboard
  Particle.publish("Temperature in Celsius:  ",  String(cTemp));
  delay(1000);
  Particle.publish("Temperature in Fahrenheit:  ", String(fTemp));
  delay(1000);
  Particle.publish("Relative Humidity :  ",  String(humidity));
  delay(1000);
}

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