This is a moisture sensor project based on the GardenBot project(**https://gardenbot.org/howTo/soilMoisture/**), it runs the current both forward and reverse. This allows to use a cheap two-probe soil moisture sensor with a less electrolysis.
This is my first PCB, so any suggestion or advice is very welcomed!
This board uses a supercapacitor rated at 5.5V which is intended to be charged by a solar cell rated at 6V. The moisture sensing is done by one of the cheap capacitive sensors. The ATtiny85 microcontroller firmware reads the moisture sensor every 30 seconds and blinks the LED if the measured value is over a threshold. The button is used to program the threshold.
* Supercapacitor: https://www.alie...