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STM32F103 Boards

From company STMicroelectronics there is a powerful low cost ARM®-based 32-bit MCU with 64 or 128 KB Flash, USB, CAN, 7 timers, 2 ADCs, 9 com. interfaces, named STM32F103x8 (64 KByte Flash ROM) and STM32F103xB (128 KByte Flash ROM).

It is interesting that some (most?) STM32F103x8 also have a 128 KByte Flash ROM, explained later.

There are 2 popular boards (3 - 5 EUR) on the market (Ebay, banggood.com, etc.):

Unfortunately boards delivered from China have usually very little documentation for the usage.

I like to explain the usage with the Arduino IDE (version 1.8.5).

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ESP32 Breakout Board


/!\ The pinout of the ESP32Dev Board and the Wemos LoLin32 are different.


Let's come to the details:

See on the right side the picture. The jumper can be replaced with an mA meter for measuring the standby current.

Links #1. Then you need the Hardware Extension ESP32, which can be installed with:

Parts List

  1. WeMos® LOLIN32 V1.0.0 WiFi + Bluetooth Board, https://www.banggood.com Product ID: 1164252, or https://de.aliexpress.com

  2. 100Pcs Mini Micro JST 2.0 PH 2Pin Connector Plug With 120mm Wires Cables, 3 EUR, https://www.banggood.com Product ID: 1147298

  1. Arduino Software IDE download (Integrated Development Environment), actual version 1.8.5.

  2. Hackaday - Wemos LoLin32 ESP32 module review

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