Magnetoresistive force sensors for an Instrumented Pen applied to tetraplegic writing

The project involved the design and construction of a magneto resistive (MR) force sensor to work as a feedback element in an Instrumented Pen for tetraplegic writing using Functional Electrical Stimulation (FES). The sensor was designed by using silicon rubber as a force to displacement primary sensor, whilst the MR sensor was used as the secondary one. It was possible to obtain a lateral displacement sensitivity for the MR device of −40 mV/mm in a 1.5 mm range.