The project, called ‘People Counter’, can be assembled in less than an hour and records the number of people entering and exiting a room, indicating when it is safe to allow more people to enter while still maintaining the recommended distance from others. This is particularly effective in retail environments where safe social distancing can be difficult to control. Two photoelectric proximity sensors, or light barriers, detect the direction of movement, while a miniature PLC calculates the number of people in and out of the store in real time. A password-protected CAN touch screen is used to pre-set the maximum people limit and also serves as a ‘traffic light’ system, illuminating green when access is granted and red when access is denied. There is also an audio alert. The miniature PLC processes the data and controls the display. The project design is very simple. All of the parts required are available to purchase from RS, and the full Bill of Materials, 3D data, software and manuals can be downloaded from the RS DesignSpark engineering website. A short video also gives instructions on how to build the system.
RS Components - www.rs-online.com