# Adafruit EYESPI BFF
## Overview
Our QT Py boards are a great way to make very small microcontroller projects that pack a ton of power - and now we have a way for you to add a small, colorful, and bright display to any project.
Our most recent [display breakouts have come with a new feature: an 18-pin "EYE SPI" standard FPC connector with flip-top connector](https://www.adafruit.com/?q=eyespi&sort=BestMatch). This is intended to be a sort-of "[STEMMA QT](https://learn.adafruit.com/introducing-adafruit-stemma-qt) 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, it's a perfect matching for [our QT Py boards](https://www.adafruit.com/search?q=qt+py) to make extra smol microcontroller boards with [big bold colorful displays](https://www.adafruit.com/search?q=eyespi+display) or [power-sipping E-Ink](https://www.adafruit.com/search?q=e-ink).
Don't forget you'll also want an [18-pin EYESPI FPC cable](https://www.adafruit.com/product/5462). And of course [one of our EYESPI displays](https://www.adafruit.com/search?q=eyespi) 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.
We also have '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.
We include some header that you can solder to your QT Py. [You can also pick up an Itsy Bitsy short female header kit to make it removable but compact](https://www.adafruit.com/product/4174), you'll just need to trim down the headers to 7 pins long.
- Comes as an assembled and tested PCB
- For any QT Py or Xiao boards
**QT Py, display and EYESPI cable are not included**.
- [Next Page](https://learn.adafruit.com/adafruit-eyespi-bff/pinouts.md)
## Primary Products
### Adafruit EYESPI BFF for QT Py or Xiao - 18 Pin FPC Connector
[Adafruit EYESPI BFF for QT Py or Xiao - 18 Pin FPC Connector](https://www.adafruit.com/product/5772)
Our QT Py boards are a great way to make very small microcontroller projects that pack a ton of power - and now we have a way for you to add a small, colorful, and bright display to any project.
Our most recent [display...](https://www.adafruit.com/?q=eyespi&sort=BestMatch)
In Stock
[Buy Now](https://www.adafruit.com/product/5772)
[Related Guides to the Product](https://learn.adafruit.com/products/5772/guides)
## Featured Products
### EYESPI Cable - 18-pin 50mm long Flex PCB (FPC) A-B Type
[EYESPI Cable - 18-pin 50mm long Flex PCB (FPC) A-B Type](https://www.adafruit.com/product/5462)
Connect this to that when an 18-pin FPC connector is needed. This 50mm long cable is made of a flexible PCB. It's A-B style which means that pin one on one side will match with pin one on the other side. How handy!
Out of Stock
[Buy Now](https://www.adafruit.com/product/5462)
[Related Guides to the Product](https://learn.adafruit.com/products/5462/guides)
### EYESPI Cable - 18 Pin 100mm long Flex PCB (FPC) A-B type
[EYESPI Cable - 18 Pin 100mm long Flex PCB (FPC) A-B type](https://www.adafruit.com/product/5239)
Connect this to that when a 18-pin FPC connector is needed. This 25 cm long cable is made of a flexible PCB. It's A-B style which means that pin one on one side will match with pin one on the other side. How handy!
In Stock
[Buy Now](https://www.adafruit.com/product/5239)
[Related Guides to the Product](https://learn.adafruit.com/products/5239/guides)
### EYESPI Cable - 18 Pin 200mm long Flex PCB (FPC) A-B type
[EYESPI Cable - 18 Pin 200mm long Flex PCB (FPC) A-B type](https://www.adafruit.com/product/5240)
Connect this to that when a 18-pin FPC connector is needed. This 20 cm long cable is made of a flexible PCB. It's A-B style which means that pin one on one side will match with pin one on the other side. How handy!
In Stock
[Buy Now](https://www.adafruit.com/product/5240)
[Related Guides to the Product](https://learn.adafruit.com/products/5240/guides)
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