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This firmware requires per plant:
A YF-S201 flow sensor or equivalent. A solenoid valve. A transistor to turn on the solenoid. A potentiometer to adjust the output flow. Everything you need to modify is in the main.cpp file at the top. Just modify the channels array and corresponding NumPlants, and adjust the watering cycle times and max output flow. I'll be making a circuit board to run this software with, so check back soon.