AVR-Chat

You might consider an opto isolator to be sure nothing bad gets to the processor. Inexpensive and easy to apply.

Jim

  ----- Original Message ----- 
  From: Brian 
  To: AVR-Chat@yahoogroups.com 
  Sent: Tuesday, July 28, 2009 8:01 PM
  Subject: [AVR-Chat] Re: AVR inputs


    Never thought about that one. Man do I have a lot to learn. Thanks.

  Brian

  --- In AVR-Chat@yahoogroups.com, Jim Wagner <wagnerj@...> wrote:
  >
  > One way is to add a series resistor to each input (say 4.7K to 10K), 
  > then add a diode (preferably Schottkey,j but silicon junction will 
  > work) from each input to the processor Vcc, cathode to Vcc. That will 
  > limit each input at the micro to the current Vcc )(plus one diode drop).
  > 
  > Jim Wagner
  > Oregon Research Electronics
  > On Jul 28, 2009, at 7:40 PM, Brian wrote:



  

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