Seeed have a detailed assembly diagram clearly detailing how to rivet each PCB to the included strap. The NFC antenna appears to be slightly longer than its allocated holes, but fits comfortably regardless. The battery PCB is installed connector-down in order for the rivets to attach, which implies that the 11-pin connector should be twisted before connecting.
Source code for an example RePhone watchapp is available, as is a pre-built .pbw. The example app demonstrates the Battery, Location and Navigation, and NFC Services. The Xadow battery voltage is displayed, and pressing select allows the user to enable charging of the Pebble itself from the smartstrap battery. Location, speed, altitude, and satellite data are displayed. NFC tag IDs can be read by placing them under the included antenna.
The current firmware implements Battery, Location and Navigation, and NFC Services using Pebble's standard smartstrap protocol. The firmware source is available on the ARM mbed Developer Site and the adapter can be flashed in the standard mbed fashion of uploading a cloud-compiled binary to the device while in USB mass storage mode. A simple connector can be fashioned by bending 0.1" header pins inward slightly to match the pad layout on the adapter.
- Seeed RePhone Xadow Pebble Time Adapter wiki page
- Seeed RePhone Strap Kit for Pebble Time watchapp
- Seeed RePhone Strap Kit for Pebble Time firmware
- Xadow GPS v2 wiki
- Xadow GPS v2 source
- Xadow NFC v2 wiki
- Xadow NFC v2 source
- RePhone wiki
- RePhone forums
- Xadow Pebble forums
- Seeed RePhone Strap Kit for Pebble Time Kickstarter campaign
- Seeed RePhone Strap Kit for Pebble Time Unboxing
- RePhone Strap Kit for Pebble Time demo video
- Original Pebble Xadow concept