hiramvillarreal / i2cHoneywellHumidity

Interfacing Honeywell Humidity Sensors on Raspberry Pi.

Humidity and Temperature Reader for Honeywell Sensors

Reads temperature and humidity from Honeywell sensors using the i2c interface.
Sensors with SPI output are not supported!
Likely to work with the following sensors:

• 1.7 percent relative humidity accuracy (Datasheet):
  HIH9120-021-xxxx
  HIH9121-021-xxxx
  HIH9130-021-xxxx
  HIH9131-021-xxxx

• 2 percent relative humidity accuracy (Datasheet):
  HIH8120-021-xxxx
  HIH8121-021-xxxx
  HIH8130-021-xxxx
  HIH8131-021-xxxx (tested with this sensor)

• 3 percent relative humidity accuracy (Datasheet):
  HIH7120-021-xxxx
  HIH7121-021-xxxx
  HIH7130-021-xxxx
  HIH7131-021-xxxx

• 4 percent relative humidity accuracy (Datasheet):
  HIH6120-021-xxxx
  HIH6121-021-xxxx
  HIH6130-021-xxxx
  HIH6131-021-xxxx

• 4 percent relative humidity accuracy (Datasheet):
  HIH6120-021-xxxx
  HIH6121-021-xxxx
  HIH6130-021-xxxx
  HIH6131-021-xxxx

The code follows the Technical Note on I2C communication with Honeywell sensors

See also: Blog post on interfacing Honeywell humidity sensors on a Raspberry Pi 2.

Build

Make sure you have i2c-tools and libi2c-dev installed on your system. On Debian-based systems (Ubuntu, Raspbian):

$> sudo apt-get install i2c-tools libi2c-dev

Then issue make:

$> make

Run

Run the executable via

$> ./i2cHoneywellHumidity

License

The code is provided under a permissive MIT/X11-style license. See file LICENSE.txt for details.