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Raspberry Pi 4 Model B - Under Voltage Detection

dk06

How to Overcome under Voltage Detection Raspberry Pi4 ?

  • DK is this a question. The start of a discussion. Maybe an errant post. I'm not sure of what you are looking for. I speculate you like some training or event on Pi4B power detection?

  • If you are getting under voltage detected message, means you are not supplying enough power to the Pi. Use a better USB charger. Better to use the official RPi charger.

    https://in.element14.com/raspberry-pi/sc0213/rpi-power-supply-usb-c-5-1v-3a/dp/3106941

  • in reply to aswinvenu

    i've been plagued with these messages for years.  i've swapped out power supplies to try more powerful / stable ones.  and the under-voltage situation continued.

     

    then i read that maybe it's not the power supply, per se ... but the USB cables that are stealing the voltage.  higher resistance (cheaper) cables drop the voltage.  i just swapped out some cheap ones for some more beefy ones (23 AGW wires).  haven't seen a drop since.

     

    so spend some money on the power supply, sure.  but don't scrimp on the power cables.

     

    hope this helps.

     

    (  more info than you never wanted to know about USB resistance:  https://tinyurl.com/y6mdjfve  )

  • in reply to waldotj

    The official Raspberry Pi 4 power supply and the power supplies I bought from Canakit (a Canadian retailer) use 18 AWG wire to minimize the voltage drop.

    20-22 AWG might work, depending on how hard the Pi is working and what is connected to it but it really is cutting it close. With normal USB-C cables you

    are most likely to find 26 or 24 AWG. The biggest problem with "normal" USB cables is that they almost never follow the specification for the maximum

    current allowed on a USB interface which also depends on which USB connectors the cable uses. Most of the time what you are connecting to (keyboards,

    mice, cameras, etc.) doesn't need it. It's when you start using USB cables for charging or supplying power to a Raspberry Pi or some of the other SBCs that

    it becomes VERY important.

     

    If the packaging or label does not tell you what the wire gauge the cable uses it is usually printed on the cable itself. Normally what you will see is two numbers

    28/26 AWG or something like that. The highier number will be the wire gauge used for the data signals and the lower number will be the wire gauge used for

    power (the wire diameter gets larger as the gauge number goes down).

  •   wrote:

     

    How to Overcome under Voltage Detection Raspberry Pi4 ?

    I had this error every 1-2 minutes.

    I already started to look for other power supply online, but then a quick look on the current power supply and I found that it was half way out from the power socket, I plugged it all the way in and the errors stopped!

    Hope that I helped image