Strange ESP32-S3 GPIO Issue
Posted: Sat Dec 27, 2025 1:25 am
I designed an ESP32 board myself using KiCad. During usage, I found that the external device could never be detected when the SPI interface was connected. After a long period of troubleshooting, I discovered that when I set the pins IO10, IO11, IO12 (marked on the schematic) to high level, the pins IO47, IO21, IO14 would also go high (I verified this with LED tests). However, when I switched to other GPIO pins, the SPI peripheral worked normally.I would like to ask what might be causing this issue 
. The circuit board was designed in KiCad, and the short-circuit test showed no problems (I measured pins like IO10 and IO47 with a multimeter and confirmed there was no short circuit between them).
. The circuit board was designed in KiCad, and the short-circuit test showed no problems (I measured pins like IO10 and IO47 with a multimeter and confirmed there was no short circuit between them).