Begin hardware setup guide

Programming-Debugging-the-pyboard-using-ST-Link-v2.md

@@ -18,6 +18,20 @@ You can now configure IO pins, interrupts, etc. Selecting Generate Code will gen
 
 One such configuration that has been tested in using [CLion](https://www.jetbrains.com/clion/) and it's [OpenOCD plugin](https://github.com/elmot/clion-embedded-arm/blob/master/USAGE.md).
 
+# Hardware Setup
+
+First, connect the ST-Link/v2 USB cable to your development host.
+
+Second, from the [micropython README](https://github.com/micropython/micropython#the-stm32-version):
+
+> connect the 3V3 pin to the P1/DFU pin with a wire (on PYBv1.1 they are next to each other on the bottom left of the board, second row from the bottom).
+
+This is needed because the programming pins on the pyboard are shared with LEDs, so if the MicroPython firmware it running, it conflicts with the ST-Link/v2 programming.
+
+In the following diagram, P1/DFU is labelled BOOT.
+
+![pvbv11-pinout](https://micropython.org/resources/pybv11-pinout.jpg)
+
 # References
 
 - [Programming the STM32F4DISCOVERY using External ST-Link/v2](https://electronics.stackexchange.com/a/410840/194001)