Tuesday, April 29, 2014

HIH-4030 humidity sensor

Humidity is weird.  We experience it all the time, but what we're really feeling is relative humidity.  RH is variable with changes in the temperature, and so any humidity sensor must also have some sort of temperature value to compare with to make a realistic estimate of the actual relative humidity.

Fortunately, the HIH-4030 Breakout is pretty darn simple to set up, as you can see above.  Hook up the power, ground, output, and you're basically done.  The only part left is programming your microcontroller to correctly interpret the analog signals from the sensor.