OLIMEXINO-STM32 Development Board Olimex OLIMEXINO-STM32 Development Board is based on the Arduino open-source electronics prototyping platform and the Maple project. It is designed around the ARM7 STM32F103RBT6 microcontroller, a high-performance ARM Cortex™-M3 32-bit RISC core operating at a 72MHz frequency, with high-speed embedded memory, and an extensive range of enhanced I/Os and peripherals connected to two APB buses. The OLIMEXINO-STM32 Board uses a DC/DC power supply which accepts power from 9 to 30VDC, making it possible to use virtually any power supply adapter on the market and also enabling applications which operate on an industrial power supply of 24VDC.