a soil moisture sensor using capacitors as the sensor. it's how i learned to code. i found a few different versions of the project online. couldn't get them to work very well but i was able to piece together enough knowledge of basic circuits to get the sensor to work well with my own circuit design.
once i got it to work, i left it on my desk for a few months and then cleaned it up/removed the circuit. only documented the circuit by a couple of bad photographs, so i'm not sure how to recreate it. i might could figure it out again if i spent the time, but i've been focused on other projects.
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