Circuit Library
Circuits ready to build, shared by people using Circuit Canvas. Each one comes with a parts list, a schematic and a picture showing how to connect it all on a breadboard, perfboard or stripboard. Want to change something? Make your own copy in one click.
Newest circuits
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Scoreboard Display
A simple project that counts the number of times you've pressed the button. Can be used as a scoreboard display for a game. Or to keep tracks of things like…
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555 Timer: Blink LED
Here's how to build a simple LED blinker using a 555 timer. The 555 timer is configured as an astable multivibrator, which means the output will turn on and…
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555 Machine Gun
This "machine gun" circuit generates a sound that mimics the sound of a toy machine gun. It is based around a 555 timer IC in a feedback loop. Check out this…
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555 Timer: Running LEDs (Knight Rider)
This circuit creates a light that "runs" back and forth using a 555 timer and a decade counter. It's effect is similar to the light bar on the car from the…
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IR Remote Switch v2
This project shows you how to create a simple remote-controlled on-off switch that will work with most IR remote controls. And you only need four components…
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Arduino Traffic Lights
This is a simple traffic light project that simulates the behaviour of European traffic lights: First Red. Then Red + Yellow. Then Green. Then Yellow. This…
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Arduino Memory Game
This is a simple Memory Game game built with Arduino. The point of the game is to repeat the sequence of colors that the Arduino comes up with. The sequence…
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Arduino Melody Player
This is a simple project where you connect a buzzer to your Arduino to play a melody. You'll use Arduino's tone() function to play different tones and combine…
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555 Timer: Police Lights
This project sets up two flashing LEDs, one red and one blue, to create a police lights effect. You can use this circuit to integrate into a toy, or just to…
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Schnaps Song Player
This is a simple circuit to play a song with ATtiny85. It plays the hardcoded song one time at start-up, then stops. To play the song again, you need to press…
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Bird Feeder Detector
Do you want to know when there's a bird in your bird feeder? There's a circuit for that! This uses a PIR motion sensor that works with infrared light. And it…
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Simple Flashlight
This shows a very simple flashlight project with a LED and a resistor. The switch controls if the light is on or off. Build this into a small casing, and you…
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Basic LED circuit
Never built a circuit before? Then start here. You can build this in a couple of minutes. It's a simple LED circuit that's powered by a 9V battery.
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Op-Amp Circuit: Thermostat Fan
This is an op-amp circuit that turns on a fan when the temperature goes above a certain threshold. The threshold can be adjusted with a potentiometer.
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Simple Water Sensor
This project is a a very simple water-leak detector. Place two exposed wires on the floor near your washing machine or some other place where you want to…
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Mailbox Detector
This is a simple project that detects when you got mail! To build it, you need to place a permanent magnet in the lid of your mailbox. And you need to place…
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Automatic Night Lamp
This is an automatic night lamp. The lamp turns on automatically at night. Tweak the value of R2 (or replace with a potentiometer) to adjust the amount of…
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Blinking Holiday Lights
Blinking holiday lights are always fun. This circuit is easy to build and it’s something you can put to use right away. The blinking part of the circuit is…
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Simple Rain Detector
This project is a a very simple rain detector. When a drop of water hits the rain sensor board overlapping two neighboring strips, they create a bridge where…
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"Go back to bed" gadget
This is a gadget that notifies me whenever my daughter tries to sneak out of her room past bedtime. It's based off a standard 433MHz remote control and…
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Automatic Garden Lights
A circuit that turns on your garden lights at night. This circuit is connected between the power source of my garden lights and the lights. When the night…
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Egg Timer on Breadboard
This is an egg timer circuit that sounds the alarm when your egg is ready. You can choose between: soft (3.5 minutes) medium soft (5 minutes) medium hard (7…
