<![CDATA[Roller485-Lite power supply]]>Hi all! My first post here...

I'm planning to use a Roller485 to implement some simple machine control. I'll be using a M5Stack Core2 or similar to drive it via the I2C port, but I think that I will probably need the power levels of the PWR485 port.

Looking at the schematic, it looks like there is a blocking diode that will permit power to be supplied through the PWR485 port, but control to be provided through the I2C port - is this correct?

Many thanks in advance!

]]>https://community.m5stack.com/topic/7717/roller485-lite-power-supplyRSS for NodeSat, 09 May 2026 13:50:37 GMTSun, 27 Jul 2025 15:09:32 GMT60<![CDATA[Reply to Roller485-Lite power supply on Mon, 28 Jul 2025 12:17:08 GMT]]>@kuriko A follow-up question, if I may...

Can an M5Stack controller accept power from the Grove connector? If I connect an Atom-Lite to a Roller485Lite via the I2C port and supply 12V to the Roller485 through the PWR485 port, will this provide power to the Atom-Lite? There appears to be a path through the schematics...

TIA

Martin

]]>https://community.m5stack.com/post/29637https://community.m5stack.com/post/29637Mon, 28 Jul 2025 12:17:08 GMT<![CDATA[Reply to Roller485-Lite power supply on Mon, 28 Jul 2025 11:12:59 GMT]]>@kuriko Excellent - many thanks!

Martin

]]>https://community.m5stack.com/post/29636https://community.m5stack.com/post/29636Mon, 28 Jul 2025 11:12:59 GMT<![CDATA[Reply to Roller485-Lite power supply on Mon, 28 Jul 2025 09:45:51 GMT]]>@maby2001
If you use a Roller485, you can connect directly to PortA of the Core2 to provide power + I2C control at the same time.

Yes, you can use the 485 bus to provide power and I2C control at the same time.

]]>https://community.m5stack.com/post/29634https://community.m5stack.com/post/29634Mon, 28 Jul 2025 09:45:51 GMT