Introduction
DevKit 2 builds on top of and expands the DevKit1 capabilities, while keeping the necklace form factor. It still runs on Xiao nRF52840, but adds 8GB onboard storage, and a speaker, and replaces the on/off switch with a programmable button. This enables the device to listen in standalone mode, although you still need to connect it to the Friend app for processing.
You can see the new device announcement on X.
How to get it
Assembled Device
You can order assembled Friend DevKit 2 from the Based Hardware website.
Parts
If you prefer to assemble the device yourself, here’s the list of the parts you need:
- Seeed Studio XIAO nRF52840 Sense
- Adafruit 5769 Audio BFF Add-On for QT Py
- OWS-091630W50A-8 Speaker (8Ω, 1W, Top Port, 95dB)
- 502030 250mAh LiPo Battery
- 4x4x1.5 SMD Button
- Micro SD Card (any)
Circuit Diagram
Assembly Notes
- The speaker connector on the 5769 board should be unsoldered/removed with clippers.
- Speaker connection polarity doesn’t matter.
- ETC: To be updated.
Firmware
The firmware for the DevKit 2 is under development. You can use the DevKit 1 firmware for now, but it will not take advantage of the new hardware features.