ESP32-WROOM
Introduction
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Input-only pins: IO34, IO35, Sensor_VP, Sensor_VN, are labeled in docs as GPI (note the lack of O), which may mean they're input-only pins.
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IO32 IO33 are connected to the crystal. Docs say you can't use these 2x pins as GPIO unless you desolder some stuff on the module.
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There's 5 "strapping" pins, which effect how the ESP-32 boots depending on if they're pulled high or low. So it's possible that something you've hooked upto these pins may effect how it boots. These pins are: 0 2 5 12 15
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Note that GPIO_NUM_34 – GPIO_NUM_39 are input mode only. You can not use these pins
for signal output. Also, pins 6, 7, 8, 9, 10 and 11 are used to interact with the SPI flash
tests des ports
Les ports SS/SDA suivant fonctionnent pour le module RFID
2,4,16,32 et le port CSS
Il est possible de redefinir les ports IC2 lors de l'initialisation.
Service 3
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