For the last three months I have been designing a custom interface for the auditory lab at Carnegie Mellon University. I built an array of infrared sensors and interfaced them to MATLAB using PIC18f25k20 and other proprietary hardware. The chassis was put together by Guilliaume Lemaitre and Nicolas Zuniga from the auditory lab. The goal of this project is to measure motor response time to auditory stimulation.
Below are photos of the setup and circuits. The sensor unit shown below is a part of this circuit. The infrared LED driver portion can be seen on the cpu board. They were separated to minimize sensor size. The cpu board accepts up to 4 sensors: one IR long distance (5cm) sensor and three IR (1cm) sensors. The 5cm sensor is used to detect vertical movement and the 1cm units detect if and object is above it. The IR sensors used to be contact switches, but they had to be replaced because it contaminated the auditory stimuli.
