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  • Reading analog sensors with the Raspberry Pi

                      
    		   
    by
    wraggster
    Published on July 29th, 2012 15:24
    0 Comments Comments

    Adafruit just posted an awesome tutorial on reading analog sensors with the Raspberry Pi. It’s a great walkthrough that can be applied to your next Raspi project as well as any project where you just need one more analog input.
    Earlier, the folks over at Adafruit posted a tutorial on using a MCP3008 ADC with the Raspi to directly read analog values using a Raspi. Sometimes, though, you don’t need eight analog inputs and a 12-bit ADC to get a project off the ground. Adafruit’s tutorial for reading analog values without an ADC relies on a single 1μF ceramic capacitor attached between a digital input and ground. By pulling the sensor line high for a millisecond or two, the capacitor charges at different rates depending on the value of the analog sensor.
    Yes, it’s just an RC timing circuit but seeing as how the Raspi doesn’t have an analog input, we figure this tutorial could help out a few people.
    http://hackaday.com/2012/07/28/readi...-raspberry-pi/
    This article was originally published in forum thread: Reading analog sensors with the Raspberry Pi started by wraggster View original post
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    2. Raspberry Pi