Imagine you’re at a party and someone decides it’s time for a sing-along, so it’s over to the piano for a few songs. What could be better? How about the piano lighting up in different colors depending on the strength of the note played? Not only does it add an extra dimension to the entertainment, but also wonderfully compliments Christmas decorations and creates an ambient atmosphere. Instructables user Dangerous Tim shows how to create sound reactive red, green, and blue LED lights which look incredible at the rear of a piano, but can also be used in almost any scenario such as parties, on Christmas trees etc.
The project does require some level of knowledge in assembling an electronic circuit, however, anyone with even a passing interest in DIY should be able to create the sound reactive lights. All of the electronic components required for the circuit can be purchased for under $7, making it extremely cheap for something which looks much more expensive when complete.
Dangerous Tim creates the circuit by starting with six transistors on a breadboard, followed by a RGB LED strip. Part of the innovation of these lights are the way they react to sound, and a small mic along with an amplifier is used to detect the sound while an Arduino board is used to control it. Once all components are connected you can get creative, tweaking the levels of sound required for each color change and uploading the results to the Arduino.
When you’re happy with the result, attach the LED strip to the back of a piano, on a Christmas tree, along a skirting board, or anywhere else you would like the effect to happen and turn on the power supply. Now, whenever you play a sound, the color will change depending on the strength of the note to amaze your guests!