In the photograph, there is a vertical white line slightly to the left of
the midpoint. To the right of the line are the STM32 F100, crystal oscillators,
two user accessible LEDs, a user accessible push-button and a reset push
button. To the left is the hardware debugger interface including an STM32
F103, voltage regulator, and other components. The regulator converts the 5V
supplied by the USB connection to 3.3V for the processors and also available
at the board edge connectors. This regulator is capable of sourcing sufficient
current to support the additional hardware used for the tutorials.