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ESP32S2 Mini Multi PCB
Several products of ESP32 equipped with SSD1306 are available.
However, I have never seen a product equipped with an SSD1306 with an SPI interface.
Also, I have never seen a product equipped with a 1.3 inch SSD1306 product.
Therefore, I designed a PCB that can be equipped with an SPI interface and 1.3 inch products.
I use ESP32S2-Mini Development board.
Although this product is very small, it is equipped with 2MB of PSRAM.
You can download the Garba file from here.
You can use the zip file to order it yourself from PCB manufacturing vendors such as Elecrow/FusionPCB/PCBWay.
I ordered it on 3/31 and it arrived on 4/9.
You can repeat my order from here.
About ESP32S2 Mini
A Type-C USB connector is mounted on the board, but a USB-TTL conversion chip is not mounted.
The circuit diagram is available here.
USB ports D- and D+ are connected to GPIO19/20.
Since it uses the chip's USB-OTG function, it will not be recognized as a USB device even if you simply connect it to the host with a USB cable.
To write firmware, press ButtonRST while pressing Button0, then release ButtonRST and then Button0.
Now the device will enter DFU mode, the USB device (/dev/ttyACM0) will appear, and you can upload the firmware.
If you press ButtonRST without pressing Button0, the USB device will disappear.
In other words, USB can be used for writing, but not for STDOUT.
On ESP32-S2, GPIO43/44 are U0TXD/U0RXD, but this GPIO is not present on the pin header.
This board has 4MB of FLASH and 2MB of PSRAM.
It's strange that it is recognized as having an external flash.
There is no external flash anywhere on the board.
Enable PSRAM
In order to use PSRAM, you need to enable PSRAM by following the steps below.