ARM module STM32F103C8T6. The chip is much better than the Arduino UNO, it has a 32 bit processor, 10x more memory and 2x more flash memory. Can be programmed using Arduino IDE. Specification: - Microcontroller: STM32F103C8T6 - Core: ARM Cortex M3 32-bit - Frequency: 70MHz - Flash memory: 64kB - RAM memory: 20kB - Power supply: 3.3V - Dimensions: 5.3x2.2cm - Reset (POR / PDR). - On-board Mini USB interface https://elecena.pl/product/22605115/stm32f103c8t6-stm32-cortex-m3-compatible-module-arm-arduino 2023-02-22 https://elecena.pl/product/22605115/stm32f103c8t6-stm32-cortex-m3-compatible-module-arm-arduino 2023-08-14 https://elecena.pl/product/22605115/stm32f103c8t6-stm32-cortex-m3-compatible-module-arm-arduino 2025-10-25 https://elecena.pl/product/22605115/stm32f103c8t6-stm32-cortex-m3-compatible-module-arm-arduino 2025-10-29