Plant Watering Warning

a super simple circuit for plants

• a PNP transistor (i use CBF493S)
• a N-channel mosfet (i use 4800BDY)
• a trimmer 100k
• resistor 10k
• resistor 1k
• a led (i use a flash led)
• small battery 3.6v
• 2 stainless steel probes

you can use most of pnp transistor and N-channel mosfet..

you can adjust the sensitivity with the trimmer

print the pcb, or make yours for the parts you have

add a 3 pin connector for the battery

place the probes on a plastic with hot glue

place the pcb

• you can add a test switch between the probes
• add a nice box for the circuit
• you can recharge the battery (i dont know when)

when the plan need water the led flashing (if you use flashing led)

--you must adjust the trimmer--