Outcome

When water is added to the plant, the photon senses that there is an electrical current between the nails in the wet soil. When the soil is dry, the red LED will turn off and I will receive a notification to my phone, which will tell me to water my plant. In the future, I would like to set different resistance detectors which will let me know just how dry or moist my plant is, so the plant can maintain a comfortable moisture level – and it so it won’t become overly dry or overly wet. In general, I’m very happy with how it has turned out.