16-899D/NUR 2840 Project Page
The preliminary designs are near
ing the finishing stages. Thus far, two ideas for haptic control are being investigated.
Each method is inexpensive and is intended to produce adequate information regarding the user's motion. A mock-up of the second method was implemented using switches instead of FSRs to determine force. The device works well and will be tested once we have secured a roller-walker. The following pictures and movie demonstrate this prototype.
We have recently completed the data extraction portion of this project. Taking he ideas and designs from PHASE 1, we constructed a set of handle bars from PVC pipe, force-sensing resistors, and insulation foam and attached them to a commercial roller walker. The interface circuitry used to extract pressure readings took the input from the force-sensing resistors into and voltage-follower op-amp, which was then converted into a digital signal and queried from a serial port.