Abstract: The pupil light reflex measuring system is widely used in the field of fatigue detection and intracranial injury detection, etc. For the purposes of controlling the stimulated light source and measuring the light intensity conveniently, the paper designs a light stimulation and measurement system based on PSoC (Programmable System on Chip). The method of PWM is used to control LED, and an application on computer is programmed to control the PSoC changing the parameters of LED and gain the data of light intensity. The system is used in a real-time pupil parameter detective platform to provide the adjustable functions of light stimulation and measurement.

Key words: PSoC, PWM, light stimulation, light intensity measurement, pupil detection