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    I am using a MPR121 capacitive breakout module by sparkfun.

    I have the wiring OK and it works fine when only the module is plugged to the arduino.

    The problem started when i plugged leds and waterpumps in the arduino digital pins to respond to the capacitive sensor inputs. when other things are conected the arduino does not find the MPR121.

    i thought something was wrong with the mpr121 and i unplugged everything that wasn't related to the module and it worked again

    why does this happen and how do i fix it?

    Please help...

    I didn't find the right solution from the Internet.

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