I am having issues flashing ESPhome on these ESP32 s2 minis. I have tons of esphome devices. This isnt nearly my first. However it feels like it today…
These are the units I purchased. https://www.aliexpress.us/item/3256805791099168.html
The purple board. S2 Mini 2MB PSRAM.
Anyone have experience with these boards? Thanks.
Looks like I got the bad wifi ones… trash can! Thank you for assistance! Very informative!
Oh well, before you trash it there a couple of potencial solutions that may fix the issue.
Solution 1: routing problem on the C14 ground pad (…) the fix is straightforward. Scratch the ground plane a put a blob between the C14 cap and the ground plane.
I personally applied this fix to multiple boards and one of them actually became more stable.
Solution 2: add a 100uF (or more) capacitor between EN and GND. I personally applied this and I got some success, a few boards became stable, one of them never failed again, the others fail once a month or so.
Solution 3: Adding a small 22uF 6.3V cap along the edge of the reset switch is an easier place to tack on a cap as one side is ground and the other is the EN line.
Another person says:
Solution 4: Add a 10k resistor between 3.3v and EN pins to “increase” the EN signal voltage. Never used it, from the schematic it may make sense, there’s a pull up there and the resistor will essentially force it up.
Here’s a comment from another person that is also interesting:
I’ve read about this potencial wifi leaking into some GPIO / EN from multiple people but I’m not sure I’m convinced. By covering the antenna with a finger the person can be grounding the entire thing thus diverging the power that would’ve leaked into the EN/GPIO into their body.