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  • So I have built my first Arduino project with the Arduino Uno and the Wave Shield from Ladyada.

    I'm using this as my doorbell and have it all wired up with a 1K pull-up resistor on pin 7.

     

    The problem I'm having is that every morning around 8:15 it will randomly trigger.  It will also randomly trigger sporadically every few days.  I first thought that it was due to only running it off of 5V USB power, so I purchased the 9V power supply thinking that would solve it.

     

    How do I go about troubleshooting this?  (Things like, to know if the wire run is too long (impedance), the wrong type of resistor, bad Arduino port.)

     

    Thanks

    Marc

  • in reply to mtschaef

    @marc

     

    Humm, tricky.

    Does the doorbell sound when power is first applied? Could there be something dropping the mains power at that time every day?

     

    To determine whether it is a problem with the mains supply, try running it off a battery for a while. If it still does it, then its a problem with the software, the electronics, or electrical noise.

     

    If you have a long lead to the switch, then the pullup probably isn't low enough, and electrical nose from the heating turning on etc could easily trigger it.

     

    I would use say a 100Ω resistor in this instance. Alright, it will draw 50mA, but only while the button is pressed.

Reply
  • in reply to mtschaef

    @marc

     

    Humm, tricky.

    Does the doorbell sound when power is first applied? Could there be something dropping the mains power at that time every day?

     

    To determine whether it is a problem with the mains supply, try running it off a battery for a while. If it still does it, then its a problem with the software, the electronics, or electrical noise.

     

    If you have a long lead to the switch, then the pullup probably isn't low enough, and electrical nose from the heating turning on etc could easily trigger it.

     

    I would use say a 100Ω resistor in this instance. Alright, it will draw 50mA, but only while the button is pressed.

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