The board used in this community contribution is a STM32F411CEU6 based board from IngenuityMicro called Electron. The board has only 12 pins of which 3 are already used for 3.3V, 5V and GND, leaving use of only 9 pins.
These pins can be used for:
- 1 x TX/RX
- 4 x PWM
- 4 X ADC
- 1 x I2C
- 1 x SPI
In addition, the board has two on-board LEDs connected to PA1 and PA8 and are tested for use as GPIO, PWM.
Further information can be found on http://www.ingenuitymicro.com/products/electron/ where firmware, board layout and schema can be found.
Checkout the C# managed helpers available for this board.