OpenBCI 8 channel clone with STM32 processor — OpenBCI Forum
Amazon.com: SparkFun MicroMod STM32 Processor - ARM® Cortex®-M4 32-bit RISC core - 1.8 V to 3.6 V Application Supply - an economical and Easy to use Development Platform - Adaptive Real-time Accelerator :
Introduction to Programming STM32 ARM Cortex-M 32-bit Microcontrollers (Updated 2022)