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current per pin with external power — Parallax Forums

current per pin with external power

GJGJ Posts: 19
edited 2006-11-09 22:43 in General Discussion
Hello

I am powering the stamp with an external 12v on VIN.· I need the stamp to run some LEDs and pick up some relays.· I am using some low current relays that operate at 30mA plus whatever the led requires.· I have three relays with LEDs operating from 3 cpu pins, plus some logic circuits that I am connecting to.

Will there be a problem?· It seems that I can drive 30mA per pin and my total is 90mA plus some logic and a fe LEDs.· Will this be an issue?

Thanks
·

Comments

  • Peter VerkaikPeter Verkaik Posts: 3,956
    edited 2006-11-09 22:43
    I would not drive relays directly from pins, no matter
    what currrent they draw. I would use a transistor
    or a ULN2003/ULN2803 to drive relays.

    regards peter
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