This ESP32-powered e-ink air quality monitor measures temperature, humidity, CO₂ levels, and VOCs. It uses a custom PCB (ESP32-C3) and a 3.7" e-paper display. The full bill of materials, firmware, and ...

Soil moisture sensors are cheap and easy to interface with, to the point that combining one with an Arduino and blinking an LED when your potted plant is feeling a bit parched is a common beginners ...

Like swimming pools, hot tubs need regular monitoring to ensure their water stays clean and clear. An average person might take a water quality reading once or twice a week using test strips, but such ...