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Discussion in 'Microcontrollers, Programming and IoT' started by shadrackthox, Feb 22, 2012.

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  1. shadrackthox


    Dec 10, 2011
    i want to count the number of persons entering/leaving a room and display the output on a 2x16 lcd display....i.e when one enters the room the counter is incremented and the opposite is true,..any help?
  2. donkey


    Feb 26, 2011
    there are device that do this already. they work of 2 infared beams positioned accross the door about 30cm apart. if you walk one way they send a signel to count up, if you walk the other they send a signal to count down. they have some mis fires but generally work well. will try to see if I can find one for you
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