About

The RHT03 is a one-wire digital sensor that measures relative humidity from 0-100% and temperature from -40-80 deg C.

Repository Contents

/firmware - Source files for the library (.cpp, .h).
/firmware/examples - Example sketches for the library (.cpp). Run these from the Particle IDE.
spark.json - General library properties for the Particle library manager.

Example Usage

Create an RHT03 Object & Initialize

To begin, create an RHT03 class object. This'll often go in the global section of the code:

///////////////////////////
// RHT03 Object Creation //
///////////////////////////
RHT03 rht; // This creates a RTH03 object, which we'll use to interact with the sensor

To initialize the sensor, call the begin([pin]) function, where [pin] is the Photon pin connected to the RHT03 data pin.

void setup()
{
	...
	rht.begin(D3); // Initialize an RHT03 sensor, with the data pin connected to D3.
	...
}

Update and Read Humidity and Temp Values

Temperature and humidity values are updated in one fell single-wire swoop. To get new values from the sensor, call update(). update() returns either 1 on success, or a negative value if it fails.

int updateRet = rht.update();

If the update succeeds, use the humidity(), tempC(), and tempF() functions to get relative humidity, celsius, and farenheit temperatures. All variables are returned as float's.

if (updateRet == 1)
{
	float rh = rht.humidity();
	float tf = rht.tempF();
	float tc = rht.tempC();
}

Recommended Components

License Information

This product is open source!

Please review the LICENSE.md file for license information.

If you have any questions or concerns on licensing, please contact techsupport@sparkfun.com.

Distributed as-is; no warranty is given.

Your friends at SparkFun.

License

sparkfun/SparkFun_RHT03_Particle_Library

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