SHT1x Temperature / Humidity Sensor Library for Arduino

Copyright 2009 Jonathan Oxer [email protected] / http://www.practicalarduino.com
Copyright 2008 Maurice Ribble [email protected] / http://www.glacialwanderer.com

Provides a simple interface to the SHT1x series (SHT10, SHT11, SHT15) and SHT7x series (SHT71, SHT75) temperature / humidity sensors from Sensirion, http://www.sensirion.com. These sensors use a "2-wire" communications buss that is similar to I2C and can co-exist on the same physical wire as I2C devices.

Installation

Download the directory "SHT1x" and move it into the "libraries" directory inside your sketchbook directory, then restart the Arduino IDE. You will then see it listed under File->Examples->SHT1x.

Usage

The library is instantiated as an object with methods provided to read relative humidity and temperature. Include it in your sketch and then create an object, specifying the pins to use for communication with the sensor:

#include <SHT1x.h>
#define dataPin 10
#define clockPin 11
SHT1x sht1x(dataPin, clockPin);

You can then call methods on that object within your program. In this example we created an object called "sht1x", but it could have been called whatever you like. A complete example program is included with the library and can be accessed from the File->Examples->SHT1x menu.

readTemperatureC()

Returns a float within the valid range of the sensor of -40 to +123.8C. A value of -40 is returned in the event of a communication error with the sensor.

Example:

float tempC = sht1x.readTemperatureC();

readTemperatureF()

Returns a float within the valid range of the sensor of -40 to +254.9F. A value of -40 is returned in the event of a communication error with the sensor.

Example:

float tempF = sht1x.readTemperatureF();

readHumidity()

Returns a float within the valid range of the sensor of 0 to 100%. A negative value is returned in the event of a communication error with the sensor.

Example:

float humidity = sht1x.readHumidity();