RPi Alarm Reed Switch Voltage

Discussion in 'The Projects Forum' started by garagehacker, May 22, 2015.

  1. garagehacker

    Thread Starter New Member

    May 22, 2015
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    Hello - I have created a working RPi alarm on my workbench with two reed switches. The issue I have run into now is that when I connect my alarm to the reed switches that are wired to my home doors and windows it does not work. It does work with just one door. I think the problem is that the 5v coming from the RPi is insufficient for the reading of GPIO high/low state.

    My circuit is following this example: http://www.projects.privateeyepi.com/home/home-alarm-system-project/installation/alarm-electronics

    Can someone please advise how I would add an external power source to my reed switches without harming the RPi GPIO ?
     
  2. nsaspook

    AAC Fanatic!

    Aug 27, 2009
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  3. garagehacker

    Thread Starter New Member

    May 22, 2015
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