Circuit Library

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 detect leaks. As long as everything is dry, nothing happens. When water reaches the two wires, it conducts just enough electricity to switch a transistor on which turns on an LED.

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.

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 the Restart button. The specific song used in the example code is a traditional Danish Schnaps song. This project was built to fit into a Schnaps train that brings glasses of Schnaps around the table.

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 demo video](https://youtu.be/wSN8_ChDztw) to hear the circuit in action.