Sonic Pi 3 drives the LEDs on pi-topPULSE module

The new pi-topPULSE module contains a 7×7 LED array, a microphone and an audio amplifier. The latter can be used by Sonic Pi as its output audio path, and Sonic PI version 3 can also be used to control the LEDs on the PULSE module using OSC messages, which can be received by a python program which decodes them, and uses the commands to control the LEDs.

I have written a full article giving a detailed explanation of how this is done, which you can read here.

There is also a link in the article to the code which is used, and to a video of the program in action on youtube.

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