Features

• PCB only
• Carrier for the STM32 Blue Pill Board
• STM32F103 CPU
• I2C Hub - PCA9544A, 4-channel
• Independent 3.3V/5V power for each I2C channel
• Separate interrupts for each channel -- Header for FTDI USB to Serial
• GVS connections for Blue Pill pins
• Reset switch
• Flexible 5V power sources
• Flexible 3.3V power sources
• 5V power distribution

STM32F103 Arduino Pin Mapping

• Arduino pin 2 = B7

• Arduino pin 3 = B6

• Arduino pin 4 = B5
• Arduino pin 5 = B4
• Arduino pin 6 = B3
• Arduino pin 7 = A15
• Arduino pin 8 = A12
• Arduino pin 9 = A11
• Arduino pin 10 = A10
• Arduino pin 11 = A9
• Arduino pin 12 = A8
• Arduino pin 13 = B15
• Arduino pin 14 = B14
• Arduino pin 15 = B13
• Arduino pin 16 = null
• Arduino pin 17 = C13, onboard led, input only.
• Arduino pin 18 = C14
• Arduino pin 19 = C15
• Arduino pin 20 = A0
• Arduino pin 21 = A1
• Arduino pin 22 = A2
• Arduino pin 23 = A3
• Arduino pin 24 = A4
• Arduino pin 25 = A5
• Arduino pin 26 = A6
• Arduino pin 27 = A7
• Arduino pin 28 = B0
• Arduino pin 29 = B1
• Arduino pin 30 = B10
• Arduino pin 31 = B11