Current Pedorthics September-October 2017 - Vol.49, Issue 5 - Page 46

AN IN-SHOE COMPLIANCE MONITOR FOR THERAPEUTIC FOOTWEAR FIGURE 2. AN FSR POSITIONED ON THE UNDERSIDE OF A SHOE INSOLE FOR EXPERIMENTAL TESTING. Figure 1 shows the FSR and Figure 2 shows the sample and digitize sensor voltages, process the location of an FSR on the underside of a shoe insole samples, store the results in non-volatile memory, for experimentation purposes. We monitored the and receive commands and send out data upon voltage output of a typical FSR sensor circuit versus request. The microcontroller also can use its digital time for the FSR positioned in the shoe as in Figure input-output ports to turn on and off power to other 2 for several persons walking for 1 min., standing for devices or circuits and to receive digital inputs from 1 min., sitting with feet flat on the floor for 1 min., other devices. sitting with legs outstretched and heels on the floor for 1 min., and sitting with legs outstretched and 6. NEXT STEPS heels resting up on a stool for 1 min. As hoped, we found that the FSR circuit output can be used to The next steps are to integrate and fully test the distinguish different conditions of shoe usage and combined in-shoe hardware and software and to subject activity. develop the most appropriate package for the in-shoe 5.3. MICROCONTROLLER components for patient comfort and robustness, including allowing the clinician to place the sensor wherever desired. Also needed is to develop the 44 The heart of the compliance monitor is an cable interface for communicating between the integrated circuit chip called a microcontroller. A in-shoe monitor and a PC. This interface must microcontroller is a miniature computer that can supply an appropriate level of power to the in-shoe Pedorthic Footcare Association www.pedorthics.org