AVR reset on spark

Discussion in 'Embedded Systems and Microcontrollers' started by allahjane, Jul 27, 2014.

  1. allahjane

    Thread Starter Member

    Sep 19, 2012
    I know this is a bit late but here's what I did based on your responses to my question http://forum.allaboutcircuits.com/showthread.php?p=720837

    Added a 0.01uf ceramic cap between the power supply pins of the mcu
    Added a 0.01uf ceramic cap between reset and ground pins
    Added a 0.01uf ceramic cap between INT2 and gnd pins

    These modifications seems to have only partially solved the issue

    The Reset now wont occur for a AC switch click sparks but still occurs for strong sparks like say If I insert the mains lead of a appliance into the wall socket while the switch for wall socket is on then the result is a hanged or resetted mcu

    what more should I do to reduce the problem to zero resets?
  2. AfdhalAtiffTan

    Senior Member

    Nov 20, 2010
    Have you tried completely shielding the board with metal case; a Faraday's Cage?
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    Please show a schematic and photo of the circuit.