PROJECT TOPIC · SENSORS
Sensor Circuit Projects
Explore light, motion, and magnetic sensors with visual circuit diagrams and practical tests.
01 / GUIDED BUILDS
Choose a circuit
14 visual projects in this topic.
Adjustable Night-Light Threshold
Replace the fixed bias resistor with a variable resistor to choose how dark it must be before the LED turns on.
Photoresistor Night Light
Use a light-dependent voltage divider and an NPN transistor to turn an LED on in darkness.
Reed Switch LED
Use a magnet-operated reed switch to control a white LED without touching the circuit.
Vibration Switch LED
Create a movement-sensitive circuit that flashes a white LED when the switch is shaken or tapped.
Photoresistor Lamp Dimmer
Recreate manual Project 28 by placing a photoresistor in series with the lamp.
Phototransistor LED Control
Recreate manual Project 43 with a phototransistor controlling a protected LED.
Magnetic Color Light
Bring a magnet near the reed switch to power the color LED safely.
Magnetic Reed-Switch Lamp
Replace the manual Project 1 slide switch with a magnet-operated reed switch.
Magnetic Motor Control
Start a motor by bringing a magnet near the reed switch.
Tilt-Activated Lamp
A position-sensitive variation of manual Project 1 using the three-terminal tilt switch.
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.
Vibration-Activated Lamp
Use a vibration switch to flash a lamp when the board is tapped gently.
Tap-Triggered Motor
Use a vibration switch to pulse the motor when the board is tapped.