ESP32

M5Stack

https://m5stack.com/

ESP-IDF

https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html https://docs.espressif.com/projects/esp-idf/en/latest/get-started/linux-setup.html

ESP-duino-32

This is an ESP-32 on an arduino-uno like board. Some shields are compatible, but others (especially shields that are not R3 compliant and thus doesn't use the standard SCL and SDA headers above the AREF) are not compatible.

SPI

SS -> 5

I2C

SDA -> 21
SCL -> 22