Source at github

r2-Backplane

This is a backplane PCB for Digitabulum containing the power-management block and associated support circuits.

Intended usage

This PCB, combined with a Compute board, and a Digitabulum-r2 board (plus sensors) forms a complete electronics package for a single motion-capture glove.

The power-management block of this backplane is broken out in the PowerPlant-Module.

The CPLD GPIO pin has been routed to the 2v5/3v3 selection signal.

Features

• ESD protection diodes for ingress-resistant USB port.
• Supports full software management of battery.
• Supports reduced-voltage operation and full power down of the sensor package for maximum battery longevity.
• JTAG breakout for in-circuit programming of CPLD.

Source at github

Compute-WROOM32

This is one possible compute PCB to be used with Digitabulum-r2.

Intended usage

This PCB, combined with a backplane, and a Digitabulum-r2 board (plus sensors) forms a complete electronics package for a single motion-capture glove.

Features

• Integrated USB<–>Serial converter with Espressif monitor reset support.

Attribution

This project uses adamjvr’s KiCAD library for the ESP32.

Source at github

This is a backplane PCB for Digitabulum. When combined with the PowerPlant, it has the same schematic as the r2-Backplane.

Intended usage

This board is intended as a testing harness for functional subunits designed for use with the Digitabulum sensor package. This would be the board you would want for prototyping new CPLD designs, power supplies, or compute modules.

If you do not want to do those things, but just want a working glove, you should use the r2-Backplane instead.

The CPLD GPIO pin has been routed to the 2v5/3v3 selection signal.

Features

• ESD protection diodes for ingress-resistant USB port.
• Supports full software management of battery.
• Supports reduced-voltage operation and full power down of the sensor package for maximum battery longevity.
• JTAG breakout for in-circuit programming of CPLD.

Source at github

This is the power-management block of Manuvr’s motion-capture glove. It has been broken out as a module for testing and re-use.

Intended usage

A software-mediated single-cell li-ion battery manager for cases needing bursts of a few watts and supporting long periods of quiescent standby.

Features

• Fused battery
• Charger and fuel gauge are both i2c
• Secondary regulator has three voltages (0, 2.5, 3.3), and can be changed dynamically.
• Integrated 4-bit level-shifter (i2c capable)
• 2.54 headers
• Single-sided assembly for easy thermal-relief

Primary components

Constraints

• Battery must be li-ion chemistry.
• Primary regulator is always on and fixed at a 3.3v output.
• No single regulator may provide more than 1.8A, and the module’s maximum output wattage is 4.2 watts. See below.

Charge and discharge rate on the battery must not exceed 1A, or the internal sense resistor in the fuel gauge will burn out. There is a resetable fuse to prevent damage, but this forms the limit on the module’s practical output rating. However, the charger IC can handle up to a 20v input, and could conceivably draw more than the module’s maximum output from the input source as it charges and powers the load. Fuse accordingly. :-)

Source at github

Provides a breakout to the compute/comm PCB connector on the r2-Backplane. It is also useful as a template for a custom Compute PCB.

Intended usage

This project has two purposes:

1) To be used as-is as a signal breakout for using Digitabulum and the r2-Backplane with a new microcontroller without rolling a PCB for it.

2) To be used as a template for a custom compute PCB to be attached to the r2-Backplane.