Haptivest 2.0

Short preview hardware description of the next generation based upon David Antón Sánchez OpenVNAVI: A Vibrotactile Navigation Aid for the Visually Impaired. A more detailed construction description as well as the software will follow soon.

It uses combined I2C-PWM expander boards with driver circuit for the vibration motors, which are connected with a pinheader at the side for with crimped connectors with the motors and each other (I2C) as well as power supply.

Both motors, wiring and pcbs are hold in place with 3D-printed clips, the power pack is also hold in place with such a 3D-printed housing as well as the Up-board for processing.

Files for both PCBs and 3D-printed parts can be found on github. All 3D-printed parts for connecting electronics with the textile are designed such that they are printable without support structure.

A basic layout is cut into a textile layer (a prefabricted vest, waist belt), the example pattern cna be found also on github. Each vibration motor (5mm diameter, 8mm length with encapsulated excenter) is clipped on the textile with the 3D-printed motor housings. Normal wires are used to connect them with the driver PCB on each size, crimped connectors allow an easy exchange for faulty motors.

The wires are hold in place on the textile with additional 3D-printed clips. Each PCB get its own power line to the power pack on the pack, to reduce current stress on the wire, while the I2C lines are bundled at each side and the connected with the Up-board.

This serves as brain for controlling the motors, we use a design from the internet as encasing. A Realsense camera is connected with USB3 with the board, hold either in place in the middle of the vibration motor matrix with 3D-printed connectors or elsewhere on the users clothing.

Created by thar. Last Modification: Sunday 23 of April, 2017 18:49:57 by thar.

Media Computing Group at RWTH Aachen