adafruit learning system Joy Featherwing Manual page 3

This FeatherWing features Adafruit Seesaw technology - a custom programmed little helper microcontroller that takes
the two analog inputs from the joystick, and 5 button inputs, and converts it into a pretty I2C interface. This I2C
interface means you don't 'lose' any GPIO or analog inputs when using this 'Wing, and it works with any and all
Feathers! You can easily stack this with any other FeatherWing because I2C is a shared bus. If you have an I2C
address conflict, or you want to connect more than one of these to a Feather, there are two address-select jumpers so
you have 4 options of I2C addresses
There's an optional IRQ (interrupt) line that you can use if you'd like the Wing to let you know when a button has been
pressed. Since its optional (and most Feathers are perfectly happy polling the Wing for data) we left a bunch of solder
jumpers so you can select what pin has the IRQ on it. Or just leave it disconnected!
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