lemuel_newboy Posted September 20, 2006 Report Posted September 20, 2006 can anyone give me some suggested about what could I use in counting the number of persons leaving and enetering a single door... what kind of sensors do you think i could use... and what ICs do you suggest I use?im really knew to electronics so anyone please? Quote
ante Posted September 20, 2006 Report Posted September 20, 2006 Is this the same persons leaving the room as in the “Light management system” thread? Quote
SatthisCy Posted September 20, 2006 Report Posted September 20, 2006 Hi,i have to say that i had the same idea few months ago.A device that counts how many people enters a single door; e.g. a restaurant.I was thinking of using an optocouple or ir emmiter and transmiter. when the ir light that the emmiter receives is interrupted by a human body, it produce a reset of a flip-flop or a clock and produce an increment on a counter.counter`s outputs update a BCD decoder state .This is an overview of my idea...i dont know ecxactly what IC`s are suitable for this but you have to make a little search on logics gates - counters, encoders- decoders, 7-segment display.if you have Multisim 7 software may be very useful Quote
nickagian Posted September 21, 2006 Report Posted September 21, 2006 Moreover I want to add that my idea is to use two couples of sensors, (perhaps IR emmiter/receiver is a very good solution, as StathisCy also said) and put both of the couples at the door with some distance between them. In such a way you can also check if somebody is coming in or out..e.g. when couple #1 gives signal first and #2 afterwards, that means that somebody is coming in and when couple#2 gives signal first, that means that somebody is coming out!I have made something like that in the past, but only checked it with some switches instead of the sensors... If you want some help with what IC to use and in general about the hardware you can ask further!Just to give you an idea, I had first designed the appropriate ASM diagram and according to that easily found what and which ICs to use. For counting I had used synchronous up/down BCD counters (SN74LS190) and to display the number of people, some 7-segment displayers (SA52-11HWA) with BCD-to-7 segment decoders (DM74LS47), so as to connect them directly to the counter`s outputs. And of course some flip-flops are needed too.I hope I have helped you... Quote
lemuel_newboy Posted September 22, 2006 Author Report Posted September 22, 2006 a couple? what exactly is a couple...and for ante... yes this is the same person in light management system.. why? Quote
nickagian Posted September 22, 2006 Report Posted September 22, 2006 a couple? what exactly is a couple...I mean an IR emmiter and an IR receiver, I have called this a 'couple' because they cooperate with each other. In fact they are two seperate devices! Quote
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