Monitor to record temperature and humidity, store 24 hours history and display these in a graph. Battery level monitor screensave.

Arduino based 5" LCD touchscreen weather station with remote sensor unit.

We need to sense intensity of light in many of our IoT/home automation projects. Here I explain a simple implementation of ambient sensor.

Smarter Home Energy Use with Open Source and Cheap Sensors.

Magic wand to paint with color light based on temperature.

Just a simple infrared thermometer.

An adequate tool to keep in your First aid kit.