automatically water plants based upon moisture sensor feedback

see wiring and firmware details below.

• $6.00 rp2040 pico - (pico w optional)
• $3.70 relays 5 volt spst
• $10.76 5 volt pump -alternate pump $3.25 low cost

• wiring

• firmware inputs

  • [soilUL] [soilLL] - upper and lower moisture sensor limits
  • [ctlmode] - fully AUTO closed loop = -1; TIMER open loop = 1 [default]; OFF = 0
  • [doseSP] - target dispense dosage per pump trigger
  • [waterIntSP] - open loop trigger period for dispense check

• tuning

  • Set [ctlmode] = 0 this will turn off hydration
  • Monitor the current min and max measurents obtained by the sensors
  • Update [soilUL] [soilLL] limits outside of the measurement variation

• TIMER [ctlmode] = 1

  • firmware output

• AUTO [ctlmode] = -1

  • firmware output

• OFF [ctlmode] = 0

  • see scan examples above.