Time-Domain-Based Measurement Technique for Pressure Measurement in a Wearable Wireless Sensor Patch

Implementation of a Pressure Ulcer Prevention System would reduce health care costs by improving pressure ulcer prevention, enabling patient treatment, monitoring outside a hospital setting, and easing workload on caregivers. In order to achieve the above said goals, it is important to be able to measure local skin pressure accurately. Disadvantages of a voltage-based resistance measurement technique include the need for a steady reference voltage and accurate ADC, each of which introduces additional error and power dissipation. This paper presents a novel interfacing technique for resistive force sensors, allowing the determination of resistance using a time-based measurement approach.