BodyBytes

Current Design Decisions:

• A WiFi capable microprocessor will manage the operating system (OS)

• On boot a sensor (likely hall-effect) will trigger the device to enter a read-only recovery bootloader located on a more robust memory sector (likely FRAM)

• The operating system can be updated by the user via this bootloader

• The bodybytes can be configured for multiple different use cases beyond just a simple wifi file server

• A large user accessible memory sector (likely flash) will serve as the primary data storage medium for the OS and for user data like documents, pictures, and video

• Bodybytes will use wireless power delivery

• Capacitive energy storage (likely polymer aluminium electrolytic) will act as a buffer for brown-outs induced by spikes in power draw and temporary misalignment of the coil

• A battery powered option is possible but not planned at this time

Current Specifications:

• WiFi capable microprocessor

• MT7628DAN MediaTek Router CPU

• Bodybytes v1 will use a Trolink module

• Operating System

• Currently forking OpenWRT

• Sensor

• Currently planning to use a digital Hall-effect sensor

• May present issues with the wireless charging, but the switching noise can be filtered out

• Recovery bootloader

• Currently planning to use a separate IC with a more robust memory architecture like FRAM

• User accessible memory sector

• Currently planning to use an SDXC high density SD card directly as a component on the PCB

• Wireless power delivery

• Currently planning to use BQ51013C Texas Instruments WPC v2.0 compliant receiver IC

• Capacitive energy storage

• Currently planning to use a polymer aluminium electrolytic capacitor bank. Low ESR and high ripple current, low profile, low environmental impact, moderate cost 

Grindfest Project Notes:

Major Contributors: PJabbs, NiamhAstra, Xander52, Amal, Satur9

Project Directories/Resources: Google Drive, DT Forum, BHD Channel