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  1.  
    Hello,


    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.
    References
    https://forum.arduino.cc/index.php?topic=509708.0

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