This development board contains the STM32F103C8T6 (ARM 32 Cortex-M3 CPU) chip from the STM32 series, which is cheaper and more powerful than the well-known Arduino (such as the ATmega328) chips. It is even possible to simply program these chips via the well-known Arduino IDE. This board works on 3.3V, has 64K flash memory, 20K SRAM and a clock frequency of 8 to 72 MHz. https://elecena.pl/product/27738942/opencircuit-stm32-arm-development-board-stm32f103c8t6 2025-01-22 https://elecena.pl/product/27738942/opencircuit-stm32-arm-development-board-stm32f103c8t6 2026-02-20