Development boards DroneCode Probe development board by ZubaxZubax DroneCode Probe is a generic JTAG, SWD and UART console adapter compatible with most ARM Cortex based designs and in particular with hardware maintained by the DroneCode project. http://docs.zubax.com/DroneCode_Probe micro controller: STM32F103CBT6 USB: micro USB connector size: 22x44mm order code: 38169