Comments (1)
MitchBradley
commented on August 13, 2024
1
This is a common problem with mini ESP32 boards. Some of them have inadequate filter capacitance on the 3.3V rail, after the LDO regulator on the board. On my mini-32 boards, I added external 50uF capacitors on 3.3V. Just to be safe, I also added them on the 5V rail. Without the capacitors, if you look at the voltage rails with an oscilloscope, you can see a substantial voltage dip when wifi turns on. It is especially bad with some USB cables that have small-gauge wire inside.
Yes I know that it sometimes works with some versions of the firmware. We don't have time to track down subtle details of wifi-turn-on sequencing that only affect a small proportion of boards.
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