Reference
ESP32 DevKit V1 pinout — safe pins, strapping pins and what to avoid
Which ESP32 pins are safe to use, which are input-only, which break the boot and why ADC2 stops working the moment Wi-Fi starts. Keep this tab open.
Topic
Communication & protocols
I2C, SPI, UART, LoRa, RF and CAN — bus addressing, level shifting, termination and reading a logic-analyser trace.
Shop communication parts