Real-time safety circuit based on combined MEMS sensor data for Rehabilitation device

Abstract

The article deals with implementation of MEMS sensors to real-time safety circuit for automated rehabilitation device. It is necessary to acquire information about some dangerous situation during the rehabilitation process as fast as possible. We need a real-time response from sensors, because there is additional time needed to stop a device of several milliseconds. There is designed solution the angle, velocity, acceleration and vibration of each joints of rehabilitation arm are monitored. The Device works independently of the control system, detects critical states, stops rehabilitation process and store critical data. Two accelerometers (analog and digital) and one gyroscope sensor are used in the device. The main information is acquired from combination of MEMS accelerometer values. Gyroscope provides a check data for operation reliability. The designed solution can be used in other automated devices too, where some unpredictable error during the operation can cause a human injury.