Some of the STM32L072CZY6 pins are used by the LoRa module, so fewer GPIOs are available on this board.

These pins are not available on the board: PA6-7,15; PB0-1,3-4,10-11; PC0,13-15

These pins are available, but dedicated to the LoRa module: PA1, PC1-2

By default, A1, A3, A4, and A5 are not connected pins.

A1 and A3 can be connected to the same GPIOs as A0 and A2 by closing solder bridges SB7 and SB8.

A4 and A5 can be connected to PB9 and PB8 using solder bridges SB11 and SB12 (note that PB9 and PB8 do not have any analog/ADC capabilities though).

A third analog/ADC input is available as A6 on the PA5 pin.

There is no PWM on Arduino D5 (PB7), D6 (PB2) and D9 (PB12) unlike Arduino Uno.

For further information, please refers to the UM2115: Discovery kit for LoRaWAN (TM) and LPWAN protocols with STM32L0