STM32F1 Blue-pill: WiFi shield (WiFiNINA)

Complete tutorial here.

First of all, read the article “STM32: use WiFiNINA with ESP32 WiFi Co-Processor”, where there are all the basics to understand this shield usage better.

For me, It’s very important the network connection and network limitation on STM32 It’s very tedious. Adafruit offers a solution, but I think that a shield It’s more usable.

So I design a shield to add WiFi to my STM32F1 blue-pill.

For me, It’s very important the network connection and network limitation on STM32 It’s very tedious. Adafruit offers a solution, but I think that a shield It’s more usable.

So I design a shield to add WiFi to my STM32F4 black-pill.

The PCB is quite simple, and I also add an interface to update the firmware over esp32. Strangely, esp32-s seems to update better than esp32-wroom-32. Probably the thin wire adds noise to the serial transfer.

It’s crucial to select an stm32f1 of good quality. Some clone devices have trouble.

Here my selection of stm32 STM32F103C8T6 STM32F401 STM32F411 ST-Link v2 ST-Link v2 official

Here is the PCB drawing.

The result is this PCB. Here is the top view:

and here is the bottom.

At the top, you can see the pad to solder to select the CS pin of the WiFi module (refer the article about Wifi coprocessor).

At the bottom, I add a terminal SH1.0 horizontal to interface with FTDI and two buttons to program and reset the esp32.