List supported ESP32 boards

[zamojski]

Can you confirm which ESP32 boards are compatible with the project? They differ in SoC, RAM size, interfaces, etc.

https://www.espressif.com/en/products/devkits

[MichaelDvP]

• Binaries are only provided for ESP32 soc.
• Sourcecode is compatible with ESP32, ESP32S2, ESP32C3 and with a few lines addition ESP32S3,
• Flash minimum is 4M, more is supported
• Ethernet is only supported on ESP32 SOC.
• RAM on ESP32S2 is to low, only boards with extra PSRAM are working, maybe with some issues.
• PSRAM is supported for all SOCs.
• ESP32C3 codesize for RISC-V is a bit bigger, in future there is asymetric partitioning with loader/application needed. There is a test version.
• ESP32C2 is not supported and not planed. RAM is much to low.
• ESP32C6, not much known today, maybe in future.
• first USB flashing on S2, C3 works from platformio and esptool.exe, Esptool.py seems to have some isues with these socs, i did not get it working. Updating via web interface works.
• For operation only 2 pins for uart rx/tx are needed and can be mapped to (nearly) any pin, so most boards should work. Additional pins for LED, Dallas, Analog can also be mapped.

Tested boards as plugin in a premium gateway (esp8266 only with v2 software, others with v3.5.0b):

ESP32 have a large user base running on may systems.
For C3, S2, S3 there is only a single test on one system, maybe with lots of unknown issues.
Best choose is a ESP32 dualcore with more than 4M Flash and maybe some PSRAM.