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Design of a Light Activated Switch for Persons with Cerebral Palsy
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A light activated switch for persons to operate switch-controlled computer software or other communication device has been developed. A light emitting diode is attached to the user’s forehead. An array of photo transistors is mounted at a fixed position from the body. It requires a small but controllable motion to activate the switch by aiming the LED beam at the target area of the receiver. The false activation due to uncontrollable motion will be a problem associated with cerebral palsy. The LED in the transmitter is driven by oscillator at 1 kHz and the band pass filter which is in receiver is tuned at that frequency1. The level of received is detected by an amplitude demodulator once the signal is filtered. When the signals amplitude reach’s the threshold, a one short timer is triggered which then latches the switch for predetermined period. The system was tested by an 8 year old child and has demonstrated a satisfactory result. The sensivity and specificity are important factors for reliable operation of the light activated switch associated with the cerebral palsy.6
Keywords
Switch Technology, Computer Access, Cerebral Palsy (CP), Spastic Cerebral Palsy, Assistive Technology (AT).
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