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  • May 13, 2026 at 6:28 pm #30231
    hexbus
    Participant

    Have a built KIT1 that seems to be working fine (LAN, reports everything, using a SBM20, with a BM280 sensor). External 6V 2A PSU (RadioShack brand – have tried 5V, 6V, 6.5V, etc.)

    The SBM20 is a surplus from Electronics Goldmine. Most of the components were picked up from Mouser.

    The unit starts up, goes to around 321V and then gradually drops to around 308/307/306V and hovers around there. So, it must be something that it just at tolerance or just near it.

    Thoughts?

    Attachments:

    1. internal2.jpg

    2. internal1.jpg

    3. HV-Duty.jpg

    4. uradmonitorpic.jpg

    May 17, 2026 at 4:21 pm #30244
    uRADMonitor
    Keymaster

    This is so cool: https://www.uradmonitor.com/compiling-the-uradmonitor-kit1-firmware-in-visual-studio-code-on-windows/

    Congrats on the progress & the article!

    What you’re seeing is because usually increasing duty, increases the voltage output, so the code tried to reach the preset voltage of 380V and pushes the duty up to 90% to achieve it, but fails due to hardware constraints.

    You could change the code to make it work on a kind of parabola: if goes up to 90% but keep the max voltage reached in a variable, and resorts back to that if all duty interval was checked – instead of remaining stuck at 90%, will then go back to the optimal value.

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