$3.40 WeAct STM32WB55 board offers Bluetooth LE 5.4 and 802.15.4 (Thread/Zigbee/Matter) connectivity

WeAct STM32WB55 is an inexpensive development board based on STMicro STM32WB55 Arm Cortex-M4 wireless SoC with Bluetooth LE 5.4 and an 802.15.4 radio for Zigbee, Thread, and Matter connectivity that sells for just $3.40 shipped.

STMicro STM32WB55 wireless microcontroller was introduced in 2019, and we have covered a few development boards such as the official P-Nucleo-WB55 development pack, the STM32WB-Feather board, and the MRK-SharkyPro following the Arduino MRK form factor. All those boards would go for about $40, but thanks to China manufacturing and procurement “magic” and the cutting of a few features, the WeAct STM32WB55 board sells for just a fraction of the price making it even cheaper than the company’s ESP32-H2 board with similar connectivity options.

WeAct STM32WB55 cheap development board

WeAct STM32WB55 specifications:

  • Wireless MCU – STMicro STM32WB55CGU6
    • CPU
      • Arm Cortex-M4 application core @ 64 MHz
      • Arm Cortex-M0+ Bluetooth co-processor @ 32 MHz
      • Memory – 256 KB of SRAM
      • Storage – 1 MB Flash storage
      • Connectivity
  • Antenna – PCB antenna
  • USB – USB Type-C port for power and programming
  • Expansion – 20-pin + 15-pin headers with GPIOs, 10x analog input pins, USART, I2C, SPI, 5V, 3.3V, GND
  • Debugging – 4-pin SWD debug connector
  • Misc – NRST and BOOT0 buttons, user LED, 32MHz crystal
  • Power Supply – 5V via USB Type-C port
  • Dimensions – 56.06 x 21.08 mm

WeAct STM32WB55 dimensions

As usual, WeAct will bring the bare minimum documentation on GitHub with PDF schematics and step files, the STM32WB55 microcontroller datasheet, and a Bluetooth LE code sample. For more details about software development, you’d have to look at the documentation and resources for the P-Nucleo-WB55 or other boards.

The main strength of WeAct Studio is not software, but delivering ultra-low-cost hardware, and they’ve done a decent job on that front again…

Inexpensive STM32WB55 board

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1 Comment
1 month ago

Its flipper zero in bare minimum pcb. It have same memory (RAM and ROM) like the flipper zero.
Sadly the MCU is not supported by the free library https://libopencm3.org/

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