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adafruit@adafruit.com |
After pondering the Multi-Year Soil Sensor Thread over at zerocharactersleft.blogspot.com/2011/11/pcb-... we decided to make another prototype of our revised I2C soil sensor, this time we'll use the square wave filtering technique rather than the RC-rise-time system.
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adafruit
@adafruit.com
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We need a few more components to rectify/average the square wave signal, this is our rough draft. on the attiny816 we might be able to generate a 5 or 10MHz square wave. we also moved the AHT20 to be on a second set of pins we'll bitbang to read the temp/humidity.
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