Power outage alarm

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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0 shabaz 3 months ago

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 not much more of a leap, using say a relay module. Try controlling the blinking with a button input. If you can do that then it's not too dissimilar to getting a power status signal to know when the outage has started.

Get familiar with loops, if/else and while statements, all of which are useful tools to build up the behaviour you may want.

If you're looking for a ready-made solution rather than developing it yourself, then there are fridge alarms for not a lot of money.

But personally I would want to be notified immediately, not after two hours, just in case I'm not home. But that entails a different solution.

We had a few brief power outages one morning last week. It was interesting seeing the complete lack of business continuity plans from some of the major retail chain stores near me.. they gave up and shut for the day. On the other hand, it was a bright, warm Friday, the staff probably were not too motivated to look for an alternative solution : )
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0 EdgarAndre 3 months ago in reply to shabaz

I just orderd thi freezer alarm from Amazon. This might solve my problem. But since i bought a Pico 2 Starter kit, I will start learning the basics when the weather is bad outside. Thank you for your help. https://www.amazon.ca/ORIA-Refrigerator-Thermometer-Wireless-Restaurants/dp/B07B9QF64N?crid=3UFJ7T6Q9FI3C&dib=eyJ2IjoiMSJ9.b7EA6KGf2SVSRMGHCiX3e2uweqKHN7wxVytXzAykKVXO-6WQ-jBt-DL9F0saGYpCfFVD5XYryGSUkAvh8NuqDAIx_XAmsQBpAHeFrOo-A2lTckZ7KI5RwoDSWmEq9W59DYPIEnSBHKp6CRktTBuqvaoU410LMTiHXoSVu7zyWbbb2s55gVjzk_jtbLEuzjyaiL9up5v4rvzApHKYtob5Px_3TSAGHn6_1bfv_Mq-KMZx3b8xGwFcotZl_XPrRFLIb-UqFiHdLVqbFPJw_LfddJMnSFt1CNVjQHlFFtx3GjI.cQkrAV0WciOPkDIc8c2Q1LncWYbIZgYyv1XVfi2rzE0&dib_tag=se&keywords=oquimax%2Bfreezer%2Balarm&qid=1753388793&sprefix=oquimax%2Bfreezer%2Balarm%2Caps%2C82&sr=8-9&th=1
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0 EdgarAndre 3 months ago in reply to shabaz

I just orderd thi freezer alarm from Amazon. This might solve my problem. But since i bought a Pico 2 Starter kit, I will start learning the basics when the weather is bad outside. Thank you for your help. https://www.amazon.ca/ORIA-Refrigerator-Thermometer-Wireless-Restaurants/dp/B07B9QF64N?crid=3UFJ7T6Q9FI3C&dib=eyJ2IjoiMSJ9.b7EA6KGf2SVSRMGHCiX3e2uweqKHN7wxVytXzAykKVXO-6WQ-jBt-DL9F0saGYpCfFVD5XYryGSUkAvh8NuqDAIx_XAmsQBpAHeFrOo-A2lTckZ7KI5RwoDSWmEq9W59DYPIEnSBHKp6CRktTBuqvaoU410LMTiHXoSVu7zyWbbb2s55gVjzk_jtbLEuzjyaiL9up5v4rvzApHKYtob5Px_3TSAGHn6_1bfv_Mq-KMZx3b8xGwFcotZl_XPrRFLIb-UqFiHdLVqbFPJw_LfddJMnSFt1CNVjQHlFFtx3GjI.cQkrAV0WciOPkDIc8c2Q1LncWYbIZgYyv1XVfi2rzE0&dib_tag=se&keywords=oquimax%2Bfreezer%2Balarm&qid=1753388793&sprefix=oquimax%2Bfreezer%2Balarm%2Caps%2C82&sr=8-9&th=1
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