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This is the general purpose I/O pin set for the microcontroller.
All logic is 3.3V
Nearly all pins can do PWM output
All pins can be interrupt inputs
#0 / RX - GPIO #0, also receive (input) pin for Serial1 (hardware UART). Also PWM out
#1 / TX - GPIO #1, also transmit (output) pin for Serial1. Also PWM out
SDA - the I2C (Wire) data pin. There's no pull up on this pin by default so when using with I2C, you may need a
2.2K-10K pullup. Also PWM out
SCL - the I2C (Wire) clock pin. There's no pull up on this pin by default so when using with I2C, you may need a
2.2K-10K pullup. Also PWM out
#4 - GPIO #4, PWM out
#5 - GPIO #5, PWM out
#6 - GPIO #6, PWM out
#9 - GPIO #9, PWM out
#10 - GPIO #10, PWM out
#11 - GPIO #11, PWM out
#12 - GPIO #12, PWM out
#13 - GPIO #13, PWM out and is connected to the red LED next to the USB jack
SCK/MOSI/MISO - These are the hardware SPI pins, you can use them as everyday GPIO pins (but recommend
keeping them free as they are best used for hardware SPI connections for high speed.)
Analog Pins:
A0 - This pin is analog input A0 but is also an analog output due to having a DAC (digital-to-analog converter).
You can set the raw voltage to anything from 0 to 3.3V, unlike PWM outputs this is a true analog output
A1 - This pin is analog input A1 but is also an analog output due to having a DAC (digital-to-analog converter).
This is the second DAC, and is 'independent' of A0. You can set the raw voltage to anything from 0 to 3.3V,
unlike PWM outputs this is a true analog output. Also can do PWM.
A2 thru A5 - These are each analog input as well as digital I/O pins. These pins can also do PWM.
These pins are available in CircuitPython under the
other names are as is. So #0 / RX above is available as
Parallel Capture Peripheral
There's a 'camera' input peripheral you can use with some camera chips to capture video with 8-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 Feather M4
© Adafruit Industries
board
https://learn.adafruit.com/adafruit-feather-m4-express-atsamd51
module. Names that start with # are prefixed with D and
and
board.D0
board.RX
for example.
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