How to Design a Cheap Plant Watering Sensor

This is the third part of the meta-tutorial, where I talk about designing a cheap plant watering sensor. If you did not already read the first and second part, please do it now. These parts contain a lot information which lead to this point of the tutorial. The second part ended with step 14, designing a first prototype PCB.

via How to Design a Cheap Plant Watering Sensor (Part 3) — Lucky Resistor