<![CDATA[DinMeter - RESOLVED - No Boot Unless Serial Port Connected (ext power no worky)]]>I've got an M5Stack DinMeter board based on StampS3 ESP32 controller. It works fine while developing and plugged in with usb data cable. If I try to power the board using external power or usb power-only cable, the power led lights on the board but the display remains blank and the code does not run - almost like sleep mode.

I am new to ESP32 and understand that my board has sleep and wake functionality, but I would suspect that default operation would be to start/run when dc power is applied... I looked through demo code but see nothing related to powering board without data cable.

Anyone have experience with M5Stack or similar issues? There must be something in code or flash option that needs to be set that I am missing...

TIA

]]>https://community.m5stack.com/topic/7440/dinmeter-resolved-no-boot-unless-serial-port-connected-ext-power-no-workyRSS for NodeWed, 11 Mar 2026 00:54:49 GMTWed, 26 Mar 2025 11:58:58 GMT60<![CDATA[Reply to DinMeter - RESOLVED - No Boot Unless Serial Port Connected (ext power no worky) on Wed, 26 Mar 2025 12:34:11 GMT]]>@TomKatt
RESOLVED - someone pointed out that the example code I was running included a line to wait for the serial port to be enabled.

Code always does what you tell it, not what you mean lol.

]]>https://community.m5stack.com/post/28667https://community.m5stack.com/post/28667Wed, 26 Mar 2025 12:34:11 GMT