Generic EUC GD32F130 microcontroller

This generic EUC was bought on Ebay and was really cheap (280€ including the tax and shipping to Portugal, on January 2016).

It is underpowered and slow, even if the battery, motor and controller board seem to be similar with other more powerful generic EUCs. As a guess, seems that the lack of power is due to a low current configuration on the firmware.

The board uses GD32F130 microcontroller, which is a chinese clone of STM32F103 microcontroller. See more here about this.

Also the board have a 4 pin header for "F_WRITE" and another for "DEBUG" that I bet is the serial port connection!!! There is no data out on the debug port while the firmware is running.