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Ask an Expert Forum Power outage alarm
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  • power outage
  • pico 2
  • outage
  • alarm
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Power outage alarm

EdgarAndre
EdgarAndre 2 months ago

Hello, I am new to electronics and I would like to make a power outage alarm with a Raspberry Pi Pico 2 circuit that I bought as a kit. The Pico would be connected via USB and when a power outage occurs, a two-hour timer would start and after these two hours an alarm would sound. The circuit would be powered by a 9 volt battery for two hours. The alarm could sound for one minute with a bib every two seconds. If the power comes back on before two hours, I would like the timer to reset. Do you have any solutions to suggest or examples of circuits adaptable to this project? Thank you very much for your help.

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  • shabaz
    shabaz 2 months ago +4
    If you're a beginner, you could just try some beginner projects, they may get you halfway there. The first project is usually a blinking LED. If you can blink an LED then you can pulse a buzzer with…
  • kmikemoo
    kmikemoo 2 months ago in reply to shabaz +3
    shabaz I understand EdgarAndre's desire for the 2-hour wait. At the last place we rented, the squirrels would regularly trip the main feeder breaker. The outage would typically last 45 minutes to an hour…
  • kmikemoo
    kmikemoo 2 months ago in reply to shabaz +3
    shabaz Many years ago, I put my router on a UPS. The first outage proved that my ISP had NONE of their equipment on UPS's. Nor did they have backup generators. I can only hope that they have improved.
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  • anniel747
    anniel747 2 months ago
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  • EdgarAndre
    0 EdgarAndre 2 months ago in reply to anniel747

    I dont want to to be awaken as soon as there is a power alarm.  Not even for a 10 minutes. Two hours is when my freezer needs to get cold again. Hi like the solution from Beacon_Dave and will try it.

    Could perhaps just use a Wallwart PSU into a relay to do similar. Power goes off, relay drops connecting battery power to the Pico, which then starts a 2h countdown timer to trigger a buzzer. If power comes back on before the 2h elapses, the relay closes, power is removed from the Pico. 

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  • EdgarAndre
    0 EdgarAndre 2 months ago in reply to anniel747

    I dont want to to be awaken as soon as there is a power alarm.  Not even for a 10 minutes. Two hours is when my freezer needs to get cold again. Hi like the solution from Beacon_Dave and will try it.

    Could perhaps just use a Wallwart PSU into a relay to do similar. Power goes off, relay drops connecting battery power to the Pico, which then starts a 2h countdown timer to trigger a buzzer. If power comes back on before the 2h elapses, the relay closes, power is removed from the Pico. 

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