How to Design a Cheap Plant Watering Sensor (Part 3)
Posted on 2017-03-03— How and Why
In part three I assemble and test the prototype PCB, set ATtiny13A fuses, and refine user interaction and firmware plans. I cover LED display choices, power measurements and a modular firmware approach. If you’re building a low-cost plant sensor, read the full post for practical steps and diagrams.