Humidity Sensor - HIH-4030 Breakout

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Humidity Sensor HIH4030 Breakout.jpg
  • Manufacturer: Honeywell + Sparkfun breakout
  • Voltage: + 5 Volts
  • Communication: Analog Out
  • Spec Sheet

This is a breakout board for Honeywell's HIH-4030 capacitive 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 200μA. The Sparkfun version comes as shown in the picture, with the surface-mounted HIH-4030 already soldered onto the breakout board. The pins of the 3-pin header are spaced by 0.1".

Per Table 2 of the datasheet, the relationship between output voltage and relative humidity is as follows (assuming a +5 V supply and 25 degree C temperature): <math>RH%=32.57V_{out}-31.21</math>


  • 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 200μA
  • Enhanced accuracy
  • Fast response time
  • Stable, low drift performance
  • Dimensions: 0.75 x 0.30 x 0.2" (19.05 x 7.62 x 5 mm)


Hooking it up

The breakout board is pretty explicit in labeling the three pins that need to be hooked up. There is a ground, analog output and +5 volts that can be soldered onto wires or a row of three male header pins. Of course, the analog output of the humidity sensor should be connected to the analog input of the microcontroller.



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