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

2 posts Updated Jul 4, 2026

Night-light sensor demo on a breadboard with a photocell, LED, resistor, and a hand blocking light

beginner electronicsHow to Teach Light Sensors With a Night-Light Demo

Teach light sensors with a simple night-light demo that helps students connect photocells, input signals, LEDs, and observation-based troubleshooting.

Jul 4, 2026· 5 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