Description
Compact microcontroller expansion made simple. The Adafruit Terminal Block BFF Add-On transforms QT Py and Xiao boards with screw-terminal blocks on every pin, dual-socket headers for wire connections, and integrated Stemma QT connectivity. Features built-in LiPoly battery charging (250mA, adjustable to 500mA) with automatic USB power switching, plus support for standard AA battery packs. No soldering required for plug-and-play operation with pre-soldered headers. Stack-compatible design preserves all GPIO pins. Ideal for portable IoT projects, sensor integration, and rapid prototyping. Works with any QT Py or Xiao board—no code needed. Dimensions: 43.2mm × 30.3mm × 10.7mm. Weight: 8.5g.
We call our like of QT Py / Xiao accessories BFF - a "Best Friend Forever". When you were a kid, you may have learned about the "buddy" system; well, this product is kinda like that! A board that will watch your QT Py's back and give it more capabilities.
Unlike most BFF's, this one has sockets for a QT Py to plug right into. If your board has headers already soldered on, you can plug and play. If not, either solder pin headers on, or use press-fit / solderless headers.
Also, no pins are 'used' by this BFF, so you can stack this with other BFFs if desired.
- 0.1" / 2.54mm pitch terminal blocks on every pin
- Double-wide socket header so you have a socket pin free on every pin for plugging in wires
- Four mounting tabs, they can be broken off if not needed
- Stemma QT / Qwiic (JST SH) connector on 3V / GND / SDA / SCL for connecting any of hundreds of displays, sensors, etc. No pullups are included on the BFF - but most boards have their own.
- 3.7V/4.2V LiPoly battery support with charging through the USB port. Will auto-switch to USB power when plugged in, and charge the battery with extra power. Charge rate of 250mA, can be adjusted to 500mA by soldering a back jumper
- Lipoly battery charging can also be disabled (cut back jumper) so you can use non-rechargeable batteries like AA's in a battery pack with JST PH connector.
No code required to use, so it works with any and all QT Py / Xiao boards!
Technical Details
Product Dimensions: 43.2mm x 30.3mm x 10.7mm / 1.7" x 1.2" x 0.4"
Product Weight: 8.5g / 0.3oz
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