Google has made the hardware specifications and accessory design guidelines for the Fitbit Air tracker publicly available, encouraging creativity among independent designers. This initiative follows the community's innovative efforts to customize the device since its launch last month.
The released materials include 2D CAD drawings of the device's pebble-shaped sensor housing and the Performance Loop Band sleeve. These drawings provide essential specifications, such as mating dimensions and attach-detach force requirements, crucial for creating high-quality accessories.
Developers are advised to ensure unobstructed sensor clearance and maintain consistent skin contact for optimal performance. Recommendations include a minimum pressure of 35 mmhg (0.68psi) for effective heart rate and SpO2 monitoring during movement. Additionally, Google emphasizes the use of skin-friendly materials to minimize irritation or allergic reactions.