Basic spectrum analyzer on an APA102 RGB LED strip using a Teensy 3.1, the FastLED library, and the Teensy Audio Library.
- IKEA HOLMÖ lamp $7.99: http://www.ikea.com/us/en/catalog/products/30184173/
- DotStar (APA102) LEDs $29.95: https://www.adafruit.com/products/2240
- Teensy 3.1 board $19.95: https://www.adafruit.com/products/1625
- IR sensor $1.95: https://www.adafruit.com/product/157
- Breadboard $4.50: https://www.adafruit.com/products/1609
- Barrel jack $0.95: https://www.adafruit.com/products/373
- Power supply $7.95: https://www.adafruit.com/products/276
- Light socket adapter $4.15: http://www.amazon.com/gp/product/B001PCVTFC
- Total $77.39 + shipping and assembly
Based on SpectrumAnalyzerBasic by Paul Stoffregen: https://github.com/PaulStoffregen/Audio/blob/master/examples/Analysis/SpectrumAnalyzerBasic/SpectrumAnalyzerBasic.ino
Requires the following:
- Arduino & Teensyduino: https://www.pjrc.com/teensy/td_download.html
- Teensy Audio Library: https://github.com/PaulStoffregen/Audio
- FastLED: https://github.com/FastLED/FastLED
Uses line in on pin A2. For more information, and a recommended analog input circuit, see: http://www.pjrc.com/teensy/gui/?info=AudioInputAnalog
