Dreamer Maple-A 32-bit ARM Cortex-M3 Powered Controller
The Dreamer Maple is a microcontroller board based on the STM32F103RET6 microprocessor. It runs at a maximum of 72 MHz, has 43 digital input/output pins, 15 analog inputs, native full speed USB, 3 USARTs (hardware serial ports), integrated SPI/I2C support, a power jack, and a reset button.