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#rpisecuritysystem — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #rpisecuritysystem, aggregated by home.social.

  1. Thomas Jensen @thomasjsn ·

    On my — I started with a simple that could only send actions. I have later replaced it with a more advanced one, that can also receive states and supports RFID. (And looks much cooler) 🤓

    I am working on a blog post to explain how it is integrated with my system.

    #rpisecuritysystem #zigbee #keypad
  2. Thomas Jensen @thomasjsn ·

    It's been three years since I last posted about my security alarm project. The project is alive and well, constantly developed, and used daily.

    Here is my attempt at breaking the writer's block and get it documented:

    blog.cavelab.dev/2025/12/rpi-d

    #rpisecuritysystem #raspberrypi
  3. Thomas Jensen @thomasjsn ·

    Ordered lots of things for the project:

    - Flush mounted buzzer/sounder for the entryway, to replace the homemade one
    - More fire alarm stuff; interface card, two more smoke sensors and a laser tester
    - Ceiling mounts for the Bosch sensors, to use in the basement

    #rpisecuritysystem #pir
  4. Thomas Jensen @thomasjsn ·

    Three voltage levels are measured in the alarm system: 5V, 12V auxiliary and the battery voltage.

    A drop in the 12V auxiliary is used to detect a mains power failure.

    The battery voltage is used to estimate battery level, this is done with a dictionary of voltage to percentage where the missing values are interpolated with scipy.

    Once a month a battery test is performed, where the charger is stopped, and the battery voltage monitored until it reaches 50%.

    #raspberrypi #rpisecuritysystem
  5. Thomas Jensen @thomasjsn ·

    It looks like I've also found the reason why the voltage measurements by the was so unstable.

    Simply a user error — wrong size load capacitor, mounted too far away from the voltage reference. Soldered on a new voltage ref. with load and input capacitors, very close and correct values this time :)

    #arduino #rpisecuritysystem
  6. Thomas Jensen @thomasjsn ·

    I've spent the last few days working on my security system. This house used to have phone outlets here and there, I've repurposed some of those for a hidden buzzer/sounder.

    One in the 2nd floor den, and one in the main living room. They can do two sounds; continuous 970 Hz and 800 to 970 Hz sweep 1/s.

    Still have the "homemade" buzzer in the entryway. Going to replace that as well :)

    #raspberrypi #rpisecuritysystem