Humidity Sensor - HIH-4030 Breakout

• 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 1 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>Sensor RH%=161\frac{V_{out</div>

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This page is a Component on bildr. Components are pages about specific parts, and include connection details and code when available.

{V_{supply}}-25.8</math>

If you are using a thermometer in conjunction with the sensor (or know the ambient temperature), an adjustment can be made to improve the accuracy:

<math>RH%=\frac{Sensor RH%}{1.0546-0.0026T}</math>

where T is the temperature in degrees C. Please note that these equations are not calibrated to your individual sensor. Table 2 of the datasheet illustrates that your humidity sensor performance may deviate from this equation.

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 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.

|Code Information =

|bildrCode ID =HIH-4030

|Availability =

• Sparkfun

|Links =

• Arduino code on Arduino forum
• HIH-4030 Humidity Sensor Datasheet
• Relative humidity entry on Wikipedia

|References =

• http://www.sparkfun.com/commerce/product_info.php?products_id=9569

}}