AbdullahBaloch

We have to create a model not an actual room. we have to use our own equipment but these parts don't cost much.

We have a project in which we have to count people entering in a room and automatically turn on the light when the first person enters the room and turn off the lights when the last person leaves i.e no one is there in the room anymore. I was thinking of using 2 laser diodes and LDR to make a sensor and then monitor the order in which the sensor detects something for example if the 1st one detects an obstacle and than the 2nd it means someone has entered the room and vise versa.