灯光控制系统电路,ht Control System

It is easy to install a couple of infrared emitter and receiver at the entrance of your room and maybe you connect them to the light, but you cannot control the light in this way! You will never know how many person inside and if the room is empty or not. In this system, every thing is under control, because it is smart enough to know how many persons inside; and it can identify the direction of them, so the light will be turned OFF when the room is unoccupied; and roundtrip="0">OP295to produce the infrared beam, & two detectors in front of the emitter to detect the infrared beamOP598. Since the main idea in this device is to know person direction; and so, to get this approach, we have to use tow pieces of infrared detector in order to

 A

Detectror

Detector

1   

 High

High

2  

 Low

High

3  

 Low

Low

4  

 High

Low

5  

 High

High

 Tip:If you have a camcorder, or just a camera mobile phone, you can see the infrared light! Just point the infrared emitter at the camera then you will be able to see the infrared light in the viewfinder. If you point your remote at the camera and push a button, you will see flashing light!

identify the direction of the person as shown in Fig 2.

When Infrared beam become brokendue to any body, the output signals from these detectors will be changed in unique sequence. Controller will identify the direction of the person by analyzing these signals as shown in the table at right "from 1 to 5 passed IN, 5 to 1 passed OUT":

Since detectors output signals are analogue while the controller can roundtrip="0">LM393.

Controller will increase the number of the persons in side the room by src="/data/attachment/portal/201007/ET28010201007211053152.png" border=0>

  Notes:
- You have to isolate detectors from any kind of light, except the infrared radiation.
- UseTIP110to drive relay current; it has Base-Emitter Shunt Resistors built in. Diode D1 is acting as a freewheeling diode.
- Analogue reference voltage should be less than voltage produced by the detectors; otherwise, the system will not function properly . "Less than 0.1V is recommended"
- The maximum speed of the body to be detected by the Light control System is 1.67 metersecond = 0.462 KmHour this value is accurate height=357 src="/data/attachment/portal/201007/ET28010201007211053154.png" width=359>