<![CDATA[Atom Lite connect to sim800, RX/TX Pinout HELP]]>HI all,
I am looking to connect SIM800 model to ATOM Lite, but have a problem to understand witch pinouts are RX and TX

can anyone help with the Atom Lite PINOUT?

also is there a similar project, I want to send some data to server

thx

]]>https://community.m5stack.com/topic/3066/atom-lite-connect-to-sim800-rx-tx-pinout-helpRSS for NodeWed, 29 Apr 2026 07:57:11 GMTThu, 11 Mar 2021 16:03:04 GMT60<![CDATA[Reply to Atom Lite connect to sim800, RX/TX Pinout HELP on Thu, 11 Mar 2021 21:47:18 GMT]]>Hello @alien

on the M5Atom there are no predefined pins assigned to RX2 and TX2. GPIO21 and GPIO25 are assigned to I2C so I would not use those. I have successfully tried GPIO19 for RX2 and GPIO22 for TX2.

Good luck!
Felix

]]>https://community.m5stack.com/post/12940https://community.m5stack.com/post/12940Thu, 11 Mar 2021 21:47:18 GMT