This is a breakout board for Honeywell’s HIH-4030 humidity sensor. The HIH-4030 measures relative humidity (%RH) and delivers it as an analog output voltage. You can connect the output of the sensor directly to an ADC on a microcontroller; and, thanks to the sensor’s near linear voltage output, the data is very easy to process.
Voltage applied to the supply pins should be within 4-5.8VDC, and optimally at 5V. The sensor will typically only consume about 200uA. This product comes as shown in the picture, with the HIH-4030 soldered onto the breakout board. The pins of the 3-pin header are spaced by 0.1″.
Key Features

Near linear, analog output

4-5.8VDC voltage supply

All pins broken out to a 0.1″ pitch header

Laser trimmed interchangeability

Low power design, typical current draw of only 200uA

Enhanced accuracy

Fast response time

Stable, low drift performance

0.75 x 0.30 ” (19.05 x 7.62 mm)

Resources

Schematic

Eagle Files

Hookup Guide

Datasheet(HIH4030)

Hygrometer Reconditioning Note

GitHub(Design Files)