PROJECT TOPIC · LED
LED Circuit Projects
Beginner LED circuits that explain polarity, current-limiting resistors, switches, and sensor-controlled light.
01 / GUIDED BUILDS
Choose a circuit
14 visual projects in this topic.
LED Polarity & Current Limiting
Build a protected LED loop and learn why both polarity and a series resistor matter.
LED Reverse-Polarity Test
Reverse the protected LED and observe that polarity controls whether it can light.
Press Switch LED
Make a white LED light only while you hold down the press switch.
Reed Switch LED
Use a magnet-operated reed switch to control a white LED without touching the circuit.
Slide Switch LED
Build a white LED circuit that turns on when you close the slide switch.
Vibration Switch LED
Create a movement-sensitive circuit that flashes a white LED when the switch is shaken or tapped.
Blue LED Switch Light
Replace the color LED in manual Project 2 with a blue LED and keep the current-limiting resistor.
Morse Code LED
A safe LED variation of manual Project 103 for practicing short and long light pulses.
Motor Sound with LED
A protected LED variation of manual Project 31 that makes motor-current changes visible.
Phototransistor LED Control
Recreate manual Project 43 with a phototransistor controlling a protected LED.
Pushbutton Color Light
A momentary-switch version of manual Project 2 with a protected color LED.
Magnetic Color Light
Bring a magnet near the reed switch to power the color LED safely.
Tilt-Controlled White LED
Change board angle to control a current-limited white LED.
Tap-Triggered Blinking LED
Tap the board to energize a blinking LED through a vibration switch.