ESP32 blinking TX led when connect dupont cable to negative protoboard line

j0rd1_123
Posts: 1
Joined: Mon Sep 11, 2023 1:41 pm

ESP32 blinking TX led when connect dupont cable to negative protoboard line

Postby j0rd1_123 » Mon Sep 11, 2023 2:02 pm

I have an esp32 and suddenly when connecting to gpio 12 a cable dupont to negative protoboard line and then i connect the cable usb to my pc the led tx starts to blink fast and it doesnt stop and if i try to upload a sketch it shows an error.. if i connect the same cable but now different gpio ... like 13...5 etc.. esp32 works normally..

i think esp32 is tranferring data to my pc from gpio 12 but only when connect the dupont cable and then the usb to my pc..
but if i change gpio 12 to 13 (connect a dupont cable to protoboard) and then the usb to my pc the esp32 doesnt blink the tx and i can work normally..

i want to know what is the issue.. maybe if i reset the esp32 it will work normally if i use gpio12.. but more than solve the problem i know what the issue is? and understand the issue.. maybe there is a way to know whats wrong with esp32.. or maybe is the line where pin12 is on the protoboard
thanks in advance.

ESP_Sprite
Posts: 9709
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32 blinking TX led when connect dupont cable to negative protoboard line

Postby ESP_Sprite » Tue Sep 12, 2023 6:37 am

GPIO12 is a bootstrap line that changes the flash voltage depending on its level on reset. That may have caused this.

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