User Manual

A2 thru A5 - These are each analog input as well as digital I/O pins.

Please note, A3 functions as expected but happens to be a different microcontroller pin than the one on the Metro M4

non-WiFi version. This shouldn't affect you but if you're doing something special with that pin, like a timer or SERCOM

config, check the schematic for the underlying hardware pin name

Right side

SCK/MOSI/MISO - These are the hardware SPI pins, are are connected to the 2x3 header on the right hand side.

These are also used by the ESP32 so they should not be used for anything but SPI connectivity - not for GPIO.

Additional analog inputs

In addition to the A0-A5 pins, there are extra analog inputs available. There's not a

ton

because we ended up going

with prioritizing the PCC camera peripheral pins rather than try to stuff as many analog inputs as possible

SDA is also A6

SCL is also A7

These pins are available in CircuitPython under the board module. Names that start with # are prefixed with D and

other names are as is. So #0 / RX above is available as board.D0 and board.RX for example.

Parallel Capture Peripheral

There's a 'camera' input peripheral you can use with some camera chips to capture video with 10-bit data width. We

thought this was neat so we made sure all those pins were available. Here are the PCC pins (left) and the Metro M4

Express AirLift pins it's mapped to. Unlike other peripherals, you cannot mux these signals to other pins!

DEN1: MOSI

DEN2: SCK

CLK: MISO

D0: D13

D1: D12

D2: D10

D3: D11

D4: D9

D5: D8

D6: D1

D7: D0

D8: D5

D9: D6

QSPI Flash and NeoPixel

As part of the 'Express' series of boards, the Metro M4 Express AirLift is designed for use with CircuitPython. To make

that easy, we have added two extra parts to this Metro AirLift: a mini NeoPixel (RGB LED) and a 2 MB QSPI (Quad SPI)

Flash chip