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Teaching notes, project walkthroughs, and hands-on electronics guides from Gary and the Mr Circuit team.

3 posts Updated Jun 29, 2026
Robot light sensor pointed at a dark line and a bright surface while the robot adjusts direction
light sensorHow a Light Sensor Works in a Robot

Learn how a light sensor works in a robot by measuring brightness or reflection and turning that signal into a classroom-friendly action.

Jun 29, 2026· 4 min read
Breadboard-style night-light circuit diagram with labeled photoresistor transistor LED output and series resistor
beginner electronicsHow to Build a Simple Night-Light Circuit

Build a simple night-light circuit on a breadboard with a photocell, LED, resistor, and transistor using this beginner-friendly classroom guide.

Jun 7, 2026· 5 min read