August 24, 2012 AT 3:33 pm

Tutorial: DHT Humidity Sensing on Raspberry Pi with Google Doc logging – #piday #raspberrypi @Raspberry_Pi

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Tutorial: DHT Humidity Sensing on Raspberry Pi with Google Doc logging. Time to start exploring more sensors with the Raspberry Pi! Today we’ll be checking out the DHT11, DHT22 and AM2302 humidity and temperature sensors available from Adafruit

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In this tutorial we’ll be showing how to utilize C for high-speed GPIO polling to handle bit-banged sensor output. Many low cost sensors have unusual output formats, and in this case, a “Manchester-esque” output that is not SPI, I2C or 1-Wire compatible must be polled continuously by the Pi to decode. Luckily, the C GPIO libraries are fast enough to decode the output.

Once we have that working, we add the fun of Python to update a google spreadsheet live with the temperature/humidity data. This project would be the great basis for home or garden automation!

Learn more.

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