<![CDATA[Atom Lite only powers via USB-C but not 5V from pin header]]>I got the Atom RS485 kit and my RS485 endpoint provides +12V DC on the orange header which I want to use to power the Atom.

I measure +13V at the DC12V input pin. Without the Atom Lite connected, I measure 4.84V at the 5V pin header on the base.

However, when I connect both, I cannot reach the Atom. Note that even with the Atom Lite in place, I still measure a fixed +13V at the DC12V input pin, hence I do not believe the source is unable to supply sufficient current (otherwise the voltage would drop).

However, if I power the Atom Lite via USB-C instead, everything works.

I thought already the base is broken, hence I ordered an additional base but unfortunately same.

Why does the Atom Lite fail to power from the 5V from the pin header?

]]>https://community.m5stack.com/topic/5963/atom-lite-only-powers-via-usb-c-but-not-5v-from-pin-headerRSS for NodeSat, 14 Mar 2026 09:00:00 GMTTue, 09 Jan 2024 20:03:10 GMT60<![CDATA[Reply to Atom Lite only powers via USB-C but not 5V from pin header on Wed, 10 Jan 2024 08:33:44 GMT]]>Hello @expjwt

according to the description the M5Atom can be powered from the 12 V.

A DC/DC voltage regulator chip is integrated in the ATOM RS-485, which can directly convert the 12V voltage of RS485 to 5V to supply power for M5ATOM, avoiding the trouble of using a separate power supply.

BTW: The 5 V on the header pin is connected to the 5 V on the Groove port. What voltage do you measure between 5 V and GND on the Groove port?

Thanks
Felix

]]>https://community.m5stack.com/post/23293https://community.m5stack.com/post/23293Wed, 10 Jan 2024 08:33:44 GMT