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STM32duino

The STM32duino board is based on the ARM Cortex M3 like the Arduino Duo. The version I use is the Blus Pill I bought on E-Bay.


USB Fix

Unfortunately the board comes with a 10k pullup resistor from D+ to 3.3V (in the schematic it's a 4.7k resistor to ground). That can cause problems on some PCs. Just take the R10 out and with an 1.5k resistor like shown here: http://wiki.stm32duino.com/index.php?title=Blue_Pill#Hardware_installation


Schematic

Here one find the schematic and the manufacturer data.


Specification

 Model: STM32F103C8T6
 Core: ARM 32 Cortex-M3 CPU
 Debug mode: SWD
 72MHz work frequency
 64K flash memory, 20K SRAM
 2.0-3.6V power, I/O
 Reset(POR/PDR)
 8MHz crystal