Name: Adafruit EYESPI BFF for QT Py or Xiao - 18 Pin FPC Connector
SKU: 807442

QT Py/Xiao boards are a great way to make very small microcontroller projects that pack a ton of power - and now Adafruit have a way for you to add a small, colorful, and bright display to any project.

Adafruit's most recent . This is intended to be a sort-of " for displays" - a way to quickly connect and extend display wiring that uses a lot of SPI pins. In this case we need a lot of SPI pins, and we want to be able to use long distances, so we go with an 18-pin 0.5mm pitch FPC.

With such a slim and flexible cable, its a perfect match for to make extra smol microcontroller boards with .

Don't forget you'll also want an . And of course an too - look for the EYESPI logo on the back to know you've got one that can clip in.

MOSI/MISO/SCK SPI pins are connected to the default SPI port on the QT Py
SDA/SCL I2C pins are connected to the I2C port on the QT Py headers - some boards have a separate QT Py I2C port so keep in mind they may be separate busses.
TFT CS on TX pin - but can be re-configured/disabled by cutting a solder jumper.
TFT DC on RX pin - but can be re-configured/disabled by cutting a solder jumper.

There are also 'sometimes used' pins that can be re-configured/disabled by cutting a solder jumper:

IRQ on A0 pin - Many of our displays don't use the IRQ pin unless there's a touchscreen.
Touch CS on A1 pin - Many of our displays don't have a touchscreen.
Memory CS on A2 pin - Only our E-Ink displays have a separate memory SRAM chip, which you may be able to skip using on most QT Py's.
SD Card CS on A3 pin - Or use for whatever you like if you aren't using the SD Card socket on of our display breakouts.

There's also two through-hole solder pads for extra pins that are often considered optional and we didn't have any more IO to spare. If you aren't using any of the 4 pins above or the I2C port, you could wire these two pins with jumper wires as you desire.

Backlight control - this is default on for most of our displays, or unused on E-Ink,
Display reset - this is default on for most of our displays. Sometimes its used for low-power on E-Ink.

Adafruit include some header that you can solder to your QT Py. , you'll just need to trim down the headers to 7 pins long.