Adding Standard LEDs using the MPR121

If you are using an MPR121 for the slider bar, and wish to hook up LEDs to it and have a few spare channels, you can use it to drive LEDs.

Supplies

  • A guitar with a WT or GH5 slider bar, that has spare channels on the MPR121
  • Some LEDs
  • The correct current limiting resistor for your specific LEDs

Steps

  1. Connect your LEDs to unused channels on your MPR121. The cathode of each LED connects to ground, while the anodes are all connected to each LED, through a current limiting resistor.

Programming

  1. Click on the output you wish to configure LEDs for, and then click on the channel next to Selected LEDs on MPR121

LED inactivity

You can turn on the Turn on LEDs after inactivity setting to have the leds turn completly off after a timer. This is useful if you have leds on always on mode, but wish to have your guitar power its LEDs off after it is unused for a given amount of time.