Humidity Sensor

This function board is used to measure humidity as an analog input.


The pass-through connector on the back of the humidity sensor does not have a connection for analog input. Connecting another circuit to the analog input would negatively affect the sensor readings. Therefore an ambient light sensor, temperature probe, and humidity sensor cannot exist on the same I/O channel.

Operating Temperature -40 °C to 85 °C [-40 °F to 185 °F]
Operating Humidity Range 0 % RH to 100 % RH
Hysteresis 2 % RH
Response Time 5 s 1/e in slow moving air
Repeatability ±0.5 % RH
Settling Time 70 ms max.
Supply Current 500 µA
Stability at 50% RH ±1.2 % RH
Output Signal Analog voltage
Covered Device Yes
Moisture/Dust Filter Yes


See the Sensors section for more information on the operation of the Honeywell sensor.

The circuit diagram is as follows: