Wemos S2 mini not connecting.

[knakkwurst]

Hi

These board do not have tx/rx marked.
According to this post the tx/rx pins are 39/37, but the firmware does not accept such a high number.
wemos/docs#54
I have tried other pins without success (13 and 14)

It this board supported?

[dzungpv]

Hi

These board do not have tx/rx marked. According to this post the tx/rx pins are 39/37, but the firmware does not accept such a high number. wemos/docs#54 I have tried other pins without success (13 and 14)

It this board supported?

You can try any pin like mention in this page https://randomnerdtutorials.com/esp32-pinout-reference-gpios/ int he Setup page you can set any pin to TX and RX, default pin for Wemos S1 ESP32, you said S1 but send the S2, for ESP32 S2 you can using pin :

TX_PIN=9
RX_PIN=11

I have use this Wemos S2 mini module before and these pin work fine

[knakkwurst]

Sorry, yes the S2 (the purple one).
I am getting HVAC Status => DISCONNECTED(255) with the pins you suggested. Even tried flipping them in the UI.
Currently using a Wemos D1 mini which works great except from a few mqtt dropouts, hence the upgrade to S2.
I will investigate further, it could be a bad solder joint.

[knakkwurst]

I have found another S2 and tested with pin 9 and 11.
Still not connecting, so I assume they are both defective.

[dzungpv]

They have many pin, you can also try default TX, RX pin. It not working may cause by logic level, default logic level of the ESP32 S2 is 3.3v but the AC is 5V, you can try using level shifter, with my test D1 Mini and C3 mini module can work without level shifter.

[knakkwurst]

I confirm that the S2 is working with a logic level shifter.
Thanks for your help!