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Gas sensors makes it possible to measure concentrations of gasses such as alcohol, methane, propane, butane, and carbon monoxide.
These sensors measure the humidity of the air and can measure the temperature. Great features for your microcontroller project.
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Humidity Sensor Carrier HIH-4030
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Humidity Sensor Carrier HIH-4030
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Humidity Sensor Carrier HIH-4030
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This breakout board for Honeywell's HIH-4030 humidity sensor measures relative humidity (%RH) and outputs the result as an analog voltage on the pin labeled OUT. The sensor output can be read by an ADC on a microcontroller and varies nearly linearly with humidity, which makes the readings easy to process. The humidity sensor is powered with 5 V and typically draws 200 μA. The pins on the board have a 0.1" spacing, making them compatible with 0.1" male header pins and standard breadboards and perfboards. Since this board is a carrier for the HIH-4030, careful reading of the HIH-4030 datasheet (237k pdf) is recommended.

HIH-4030 humidity sensor’s analog output voltage vs relative humidity.


  • Nearly linear analog output
  • All pins broken out to a 0.1" pitch header
  • 4 – 5.8 V input voltage
  • 200 μA current draw
  • Dimensions: 0.75 x 0.30" (19.05 x 7.62 mm)


  • Size: 0.75 x 0.30"

General specifications:

  • Voltage: 5 V
  • Supply current: 0.2 mA



This is a carrier board for the HIH-4030 relative humidity (%RH) sensor from Honeywell outputs an analog voltage that varies nearly linearly with humidity.
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