Introduction: Particle Photon - HDC1000 Temperature Sensor Tutorial
The HDC1000 is a digital humidity sensor with integrated temperature sensor that provides excellent measurement accuracy at very low power. The device measures humidity based on a novel capacitive sensor. The humidity and temperature sensors are factory calibrated. It is functional within the full -40°C to +125°C temperature range. Here is its demonstration with particle photon.
Step 1: What You Need..!!
Step 2: Connection:
Take an I2C shield for particle photon and gently push it over the pins of particle photon.
Then connect the one end of I2C cable to HDC1000 sensor and the other end to the I2C shield.
Connections are shown in the picture above.
Step 3: Code:
The particle code for HDC1000 can be downloaded from our GitHub repository- Dcube Store.
Here is the link for the same :
https://github.com/DcubeTechVentures/HDC1000...
The datasheet of HDC1000 can be found here:
http://www.ti.com.cn/cn/lit/ds/symlink/hdc1000.pdf
We have used two libraries for particle code, which are application.h and spark_wiring_i2c.h. Spark_wiring_i2c library is required to facilitate the I2C communication with the sensor.
You can also copy the code from here, it is given as follows:
// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// HDC1000
// This code is designed to work with the HDC1000_I2CS I2C Mini Module available in Dcube Store.
#include
#include
// HDC1000 I2C address is 0x40(64)
#define Addr 0x40
float cTemp = 0.0, fTemp = 0.0, humidity = 0.0;
int temp = 0, hum = 0;
void setup()
{
// Set variable
Particle.variable("i2cdevice", "HDC1000");
Particle.variable("humidity", humidity);
Particle.variable("cTemp", cTemp);
// Initialise I2C communication
Wire.begin();
// Initialise Serial Communication, set baud rate = 9600
Serial.begin(9600);
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Select configuration register
Wire.write(0x02);
// Temperature, humidity enabled, resolultion = 14-bits, heater on
Wire.write(0x30);
// Stop I2C Transmission
Wire.endTransmission();
delay(300);
}
void loop()
{
unsigned int data[2];
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send temp measurement command
Wire.write(0x00);
// Stop I2C Transmission
Wire.endTransmission();
delay(500);
// Request 2 bytes of data
Wire.requestFrom(Addr, 2);
// Read 2 bytes of data
// temp msb, temp lsb
if (Wire.available() == 2)
{
data[0] = Wire.read();
data[1] = Wire.read();
}
// Convert the data
temp = ((data[0] * 256) + data[1]);
cTemp = (temp / 65536.0) * 165.0 - 40;
fTemp = cTemp * 1.8 + 32;
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send humidity measurement command
Wire.write(0x01);
// Stop I2C Transmission
Wire.endTransmission();
delay(500);
// Request 2 bytes of data
Wire.requestFrom(Addr, 2);
// Read 2 bytes of data
// temp msb, temp lsb
if (Wire.available() == 2)
{
data[0] = Wire.read();
data[1] = Wire.read();
}
// Convert the data
hum = ((data[0] * 256) + data[1]);
humidity = (hum / 65536.0) * 100.0;
// Output data to dashboard
Particle.publish("Relative Humidity : ", String(humidity));
Particle.publish("Temperature in Celsius : ", String(cTemp));
Particle.publish("Temperature in Fahrenheit : ", String(fTemp));
delay(1000);
}
Step 4: Applications:
HDC1000 can be employed in heating, ventilation and air conditioning (HVAC), Smart Thermostats and Room Monitors. This sensor also finds its application in Printers, Handheld Meters,Medical Devices,Cargo Shipping as well as Automotive Windshield Defog.