Wio Lite AI – An STM32H725A Cortex-M7 board for AI vision applications

Wio Lite AI is another development board from Seeed Studio’s “Wio Lite” family. The board is based on STMicro STM32H725A Cortex-M7 microcontroller with a dual-band WiFi and Bluetooth module, as well as camera & display interfaces for connected AI vision applications.

The board builds upon the earlier Wio Lite and  Wio Lite W600 boards with built-in wireless connectivity but offers much more processing power for computer vision or other applications.

Wio Lite AIWio Lite AI specifications:

  • MCU – STMicro STM32H725AE Arm Cortex-M7 microcontroller @ 550MHz with DSP instructions, 512 KB flash, 564 KB RAM
  • Memory – 8MB PSRAM (from AP Memory)
  • Storage – 16MB SPI NOR flash and  MicroSD card slot
  • Display I/F – 40-pin FPC connector for LCD RGB565 or RGB888 displays
  • Camera – 24-pin FPC connector for DCMI camera (OV2640)
  • Audio –  12-pin FPC connector for audio
  • Connectivity – Dual-band 2.4GHz / 5GHz Wi-Fi and Bluetooth 5.1
  • Expansion – Feather compatible header with 6x analog pins, 14x digital pins, 1x UART, 1x I2C, and ICSP programming signals
  • Power Supply – 5V/3A via USB Type-C port
  • Dimensions – 70.3 x 26mm
  • Weight – 9 grams

STM32H725AE MCU development boardI could not find any wiki for the board, but Seeed Studio says it is supported by X-CUBE-AI AI expansion pack for STM32CubeMX “capable of interoperating with popular deep learning libraries to convert any artificial neural network for Wio Lite AI to run optimized inferences”. More specifically, the expansion pack supports deep learning frameworks such as Keras and TensorFlow Lite, as well as all frameworks that can export to the ONNX standard format including PyTorch, Microsoft Cognitive Toolkit, MATLAB, and others. The company is also working on porting the STM32H725A board to the Arduino IDE to make it easier for beginners.

Typical applications for the board include data collection devices for Machine Learning, hand-held device IoT controllers, STEM education, motor drive and application control, alarm systems, video intercom, and HVAC.  So it’s not only for AI vision applications…

Seeed Studio’s Wio Lite AI  development board is up for pre-order now for $29 with shipping scheduled to start on September 20, 2021.

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2 Comments
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Grumpy Old Coot
Grumpy Old Coot
16 days ago

If they can port Arduino to it, I’ll buy a couple to play with. I’ll leave STM32Cube(whatever) code to the professionals.

Marcin Dąbrowski
13 days ago

Once again I am baffled by decision to use STM32H7 instead of something faster in this size and price, even faster M7 cores. What’s so appealing about STM32 to stick with it beyond F series when competition in those spaces may be a better choice?

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