<![CDATA[Short Wifi effective range and IO0=3.9V issue with Lite and Matrix]]>

<![CDATA[Short Wifi effective range and IO0=3.9V issue with Lite and Matrix]]>In my evaluation, the effective range from Wifi AP was short:
　Matrix(n=2) - 5m
　Lite(n=2) - 8m, 10m

And also, I found the IO0 port driven by CH552 is 3.9V@ESP32. This level is NG in Absolute Maximum Ratings of ESP32. With another ESP32 device - Wemos D1 R32 - I found same issue and reported it to espressif github issue :
https://github.com/espressif/arduino-esp32/issues/2144#issuecomment-657659077

Just an experiment (NOT solution), I connected IO0 to 3.3V of Lite, then the effective range was expand from 8m(purple) to over 14m(light blue) (n=1).

0_1615014334766_無題3.png

I wish the improvement by CH552 VCC 5V->3.3V on next board rev of ATOM lite and matrix.

]]>https://community.m5stack.com/topic/3048/short-wifi-effective-range-and-io0-3-9v-issue-with-lite-and-matrixRSS for NodeSat, 02 May 2026 17:50:16 GMTSat, 06 Mar 2021 07:13:20 GMT60