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    Raspberry 4 low power

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    • jrocklandundefined
      jrockland @baird1fa
      last edited by

      @baird1fa nothing else, might have a defective duet board. even when I take off the bl touch it doesn't get enough power.

      A Former User? 1 Reply Last reply Reply Quote 0
      • A Former User?
        A Former User @jrockland
        last edited by

        @jrockland said in Raspberry 4 low power:

        even when I take off the bl touch it doesn't get enough power.

        bl-touch uses negligible power. could you measure the 5v voltage at both the Duet and the Pi?

        And when you say " it doesn't get enough power" it crashes or just turn on the led (and lightening symbol on screen)?

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        • jrocklandundefined
          jrockland @A Former User
          last edited by

          @bearer thank Ill get that changed next time it stop.

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          • jrocklandundefined
            jrockland @A Former User
            last edited by

            @bearer it is running slow and hot because it doesn't receive enough power.
            I just took a IR picture of the duet and the power converter are burning up. V IN is stable, 5V isnt.

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            • A Former User?
              A Former User @jrockland
              last edited by

              @jrockland said in Raspberry 4 low power:

              it is running slow and hot because it doesn't receive enough power.

              not sure that is correct, normally it runs slow because it is hot; what does dmesg -T | grep Under-voltage say on the pi?

              also interesting to corelate with watch -n 10 vcgencmd get_throttled (or maybe a little dirtier and simpler at the same time:

              while true; do  echo -en "`date` `vcgencmd get_throttled`\n"; sleep 10; done`
              jrocklandundefined 1 Reply Last reply Reply Quote 0
              • jrocklandundefined
                jrockland @A Former User
                last edited by

                @bearer said in Raspberry 4 low power:

                dmesg -T | grep Under-voltage

                unstable voltage, drop every 30 seconds.
                temp is fine, 44c

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                • A Former User?
                  A Former User @jrockland
                  last edited by A Former User

                  @jrockland said in Raspberry 4 low power:

                  temp is fine, 44c

                  vcgencmd get_throttled doesn't return the temperature, but rather what has and is throttling the pi, voltage alone doesn't necessarily result in throttling and doesn't even have to correlate to insufficient power.

                  i get under voltage entries even with the official pi supply, but it doesn't result in throttling. (or maybe both went away after i put avoid_warnings=2 in config.txt, been a while)

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                  • jrocklandundefined
                    jrockland @A Former User
                    last edited by

                    @bearer I used other way to check the cpu and gpu temp. didnt need the get_throtled

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                    • jrocklandundefined
                      jrockland @jrockland
                      last edited by

                      @jrockland I checked the power with a voltmeter, it is bad. Ill switch to my pi power supply.

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                      • A Former User?
                        A Former User @jrockland
                        last edited by

                        @jrockland said in Raspberry 4 low power:

                        it is bad

                        excellent, but why not put up a number - pretty much everyone else doesn't have problems so something is either wrong with your duet or your setup imho; but horse, water, whatever.

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