Motion Detector

[d0n]

Hi guys i need to build a simple motion detector counter shown in a 7 segment. The two sensor will be place together at the entrance to count people, if someone pass through sensor1 it will increment 1 and shown on the 7seg, where else if that guy leaves the room(through sensor2 first) it will decrement. Anyone got the circuit diagram? Sorry i'm new to engineering, i can only explain this far.

X Y Z
0 0 Nothing happen
0 1 Decrement
1 0 Increment
1 1 Nothing happen

 

[Someone Electro]

One option wod be to have an rotaing door.So that evry guest wod rotate it an a switch wod make an pulse to an binary counter that drives an LED display.

On other option is an IR photo cell that detects wen someone breaks an IR lignt beam.The same cod be done whith an ultrasonic sensor.

There cod also be an plate that sencser wen someone steps on it.But this is unacurate.

 

[tansis]

https://www.electro-tech-online.com/custompdfs/2005/07/beectr.pdf

Ok it not directional , but have seen a circuit some place :lol:

 

[zevon8]

One possibility would be to use an up/down counter like the 4510. You would need to do two things, (1) generate a single clock pulse from each sensor, and (2), based on which sensor is generating the clock, use this signal to set the 4510 to either count up or down.

Have a search for "up down counter" here and in google.

One link: **broken link removed**

 

[DigiTan]

I have a related question. What is the smallest PIR sensor on the market? I'm not interested in the alarms or lenses, just the component that senses the IR change.

 

[Nigel Goodwin]

I have a related question. What is the smallest PIR sensor on the market? I'm not interested in the alarms or lenses, just the component that senses the IR change.

You need the fresnel lens to make it work!.

 

[tansis]

You need the fresnel lens to make it work!.

Fresnel denotes a type of construction method nothing else,
IR lenses can be concave or convex if needed.