User Manual

be aware that this pin naturally 'sits' at around 2VDC due to the resistor divider

#10 - GPIO #10

#11 - GPIO #11

#12 - GPIO #12

#13 - GPIO #13 and is connected to the red LED next to the USB jack

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

SCK/MOSI/MISO (GPIO 24/23/22)- 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)

WiFi Module & LEDs

Since not all pins can be brought out to breakouts, due to the small size of the Feather, we use these to control the

WiFi module

#2 - used as the ENable pin for the WiFi module, by default pulled down low, set HIGH to enable WiFi

#4 - used as the Reset pin for the WiFi module, controlled by the library

#7 - used as the IRQ interrupt request pin for the WiFi module, controlled by the library

#8 - used as the Chip Select pin for the WiFi module, used to select it for SPI data transfer

MOSI / MISO /SCK - the SPI pins are also used for WiFi module communication

Green LED - the top LED, in green, will light when the module has connected to an SSID

Yellow LED - the bottom LED, in yellow, will blink during data transfer

Other Pins!

RST - this is the Reset pin, tie to ground to manually reset the AVR, as well as launch the bootloader manually

ARef - the analog reference pin. Normally the reference voltage is the same as the chip logic voltage (3.3V) but if

you need an alternative analog reference, connect it to this pin and select the external AREF in your firmware.

Can't go higher than 3.3V!

Wake - connected to the Wake pin on the WiFi module, not used at this time but it's there if you want it