Design of Counting System Based on Pyroelectric Infrared Sensor

In order to facilitate to get real-time statistic number of people in and out of the building, based on pyroelectric infrared sensor, peripheral circuit and its corresponding control circuit were designed and real-time statistics on the number of people in the building were realized. General structure of the system was given,and hardware and software design of counting system were mainly stated. Practice shows that the counting system of building has higher stability, response speed and precision, and it has low price, so it has a broad application prospect.