Use an ultrasound sensor to make music that can be heard from a little buzzer. There are two modes: Improviser mode and Theremin mode. In order to switch the modes, simply detach and re-attach the buzzer to pins 2-4 for Improviser or pins 5-7 for Theremin.
What you'll need:
- Arduino Uno
- HC-SR04 ultrasound sensor
- Three-legged 8 ohm buzzer
- Jumper wires and a mini-USB cable connection to the computer
Tone.hArduino library
Modes:
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Improviser mode (buzzer at pins 2-4): Put your hand in front of the sensor and it will generate a low-pitched diatonic melody. Move your hand slowly away from the sensor, and the melody will go up in pitch. Each note will take 200 milliseconds (5 notes per second).
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Theremin mode (buzzer at pins 5-7): Have the sensor face a wall at the distance of 50–100 cm, and it will generate a steady pitch. Get it closer to the wall and the pitch will increase. Get it further away from the wall and the pitch will decrease.
Control a WS2812B LED strip so that it flashes rainbow color and blinks when a tilt sensor receives a fast physical movement.
What you'll need:
- Arduino Nano
- WS2812B LED strip (individually-addressable and programmable)
- Three-legged tilt sensor
- Jumper wires and a micro-USB cable connection to the computer
FastLED.hArduino library