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    M5 Dial Portable Power Questions

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    • S
      scoobysnax
      last edited by

      I'm working on a portable project featuring the M5 Dial. I've got a few questions about powering the device. There's the battery port underneath the stamp s3. However, if I hookup a battery to that, there seems to be no way to get the device to turn on with battery power only. Instead I have to plug in USB C power, then I can unplug it and it will run off the battery. Is there a way to configure it to turn on when only the battery is plugged in? And since it automatically turns on when USB C is plugged in, this is not ideal when trying to charge the battery for a portable device.

      I understand it should charge the attached battery when USB C power is plugged in, but someone else had asked about monitoring battery charge level and it seems like there is no fuel gauge feature built in, can you confirm if that's correct? And furthermore, there seems to be general confusion about the specific size of the JST connector for that battery terminal. Based on something I had read in the forums here (or maybe on reddit) it sounded as though the connector was a Micro JST GH 2Pin 1.25mm, but when I order some of those from Amazon, they did not fit. Can anyone point to the a specific, purchasable link for the correct connector?

      Thinking about the above, my guess is that for portable use I may need to plan on putting together an external power charging and monitoring set of devices. Perhaps something like the Adafruit Micro-Lipo USB-C Charger (MCP73833 based), an LC709203F fuel gauge board, an SPDT switch, and MT3608 boost converter module along with 18650 LiPo battery. Thoughts?

      kurikoK 1 Reply Last reply Reply Quote 0
      • kurikoK
        kuriko @scoobysnax
        last edited by

        Hi @scoobysnax
        Yes, StampS3 does not have a built-in fuel gauge.
        I suggest you make a power supply device yourself, or you can take a look at this new M5StackTimerPWR: https://docs.m5stack.com/en/unit/Unit-TimerPWR
        From the official documents and the actual photos, the battery connector of Dial is indeed 1.25mm-2P. I don't understand why the connector you bought is incompatible, or you can take a look at the official power terminal specification: https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/products/core/M5Dial/1.25WT-2P.pdf.

        Good morning, and welcome to the Black Mesa Transit System.

        felmueF 1 Reply Last reply Reply Quote 1
        • felmueF
          felmue @kuriko
          last edited by

          Hello @scoobysnax

          have you tried to push the WAKE button when M5Dial is running from battery to power on the device?

          M5Dial docs are here.

          Thanks
          Felix

          GPIO translation table M5Stack / M5Core2
          Information about various M5Stack products.
          Code examples

          1 Reply Last reply Reply Quote 0
          • D
            DevDianDankie
            last edited by

            Hi @scoobysnax

            I also searched far and wide for a connector for the bat.

            I used these: https://www.diyelectronics.co.za/store/connectors/1831-molex-125-2-pin-male-and-female-connector-cable-pair.html

            So Molex PicoBlade 1.25 2-Pin is another term you can search for.

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