ESP32 Forum

How do I reliably obtain the Ordering Code or Manufacturer Part Number for my particular module? The closest way I've found so far is by running esptool chip-id, but it seems to be missing information about the PSRAM of my vanilla ESP32.

I don't think you can read that using software. You can usually (in newer modules) derive it from the inscription of the module shield, though.

You can usually (in newer modules) derive it from the inscription of the module shield, though.

I figured as much from here
https://docs.espressif.com/projects/esp ... index.html

But does that mean I can't reliably determine how much PSRAM my module has?

I figured as much from here
https://docs.espressif.com/projects/esp ... index.html

But does that mean I can't reliably determine how much PSRAM my module has?

You can. If you look at the specification identifier, it looks like ??NxRy??, with x being the flash size and y being the psram size, in megabytes.

Hm, you're right, I guess the shields on the Wrover still follow the old format. Well, the good thing is that you can still find it: simply grab any ESP-IDF (or Arduino project, I think), enable PSRAM and the startup chatter should have a line that tells you how much PSRAM it detected.