<![CDATA[Core Ink]]>Hi,
Appreciate any help on this... I'm trying to switch a relay on/off on my Core Ink, and it's working fine while the Core Ink is connected on USB, but as soon as I unplug, it stops. Presumably this is because I only get 5V supply when on USB? How can I drive a relay from the battery on board the Core Ink? is there any 3V or 5V output from any port that should work when on battery?

Thanks,
Anthony.

]]>https://community.m5stack.com/topic/3454/core-inkRSS for NodeWed, 13 May 2026 04:15:18 GMTWed, 14 Jul 2021 12:31:30 GMT60<![CDATA[Reply to Core Ink on Thu, 15 Jul 2021 18:43:33 GMT]]>@felmue
thanks Felix for your help I now have it working... something was going wrong between moving from USB to battery.

]]>https://community.m5stack.com/post/14416https://community.m5stack.com/post/14416Thu, 15 Jul 2021 18:43:33 GMT<![CDATA[Reply to Core Ink on Thu, 15 Jul 2021 06:34:31 GMT]]>Hello @amxd55

if you have a look at the sticker on the back of M5 CoreInk you'll see that 3.3 V and 5 V OUT are powered by USB or battery. I'd use a multimeter to measure between 5V OUT and GND. It should read 5 V in both cases - USB or battery. If on battery the 5 V are not there then maybe the battery is flat?

Thanks
Felix

]]>https://community.m5stack.com/post/14408https://community.m5stack.com/post/14408Thu, 15 Jul 2021 06:34:31 GMT