Monday, June 15, 2015

Motion Sensing Security Light using Passive Infrared Sensor (PIR) Module Circuit Schematic

Eltronicschool. - Maybe you ever know about the name of Motion Sensing Security Light that can activate with a motion sensor rather than by a conventional light switch. In here we will show you one circuit schematic for Motion Sensing Security Light using  Passive Infrared Sensor (PIR) Module like in figure 1 below.

You must know that motion-sensing lights are great for lighting areas that you only use briefly, since they only stay on as long as you need. It is can turning off automatically after a few minutes, they prevent wasted electricity and help conserve energy resources like in your home. Besides, this lights for your home are great deterrents from burglars, who are startled by the sudden illumination and may believe someone awakes inside the home.

Circuit Schematic

Figure 1. Circuit of Motion Sensing Security Light using PIR Module / Electroschematics

Component Parts
  1. PIR Module
  2. Resistors (see figure 1)
  3. Capacitors (see figure 1)
  4. Diode (See figure 1)
  5. FET (see figure 1)


Circuit schematic like in figure 1 above is Motion Sensing Security Light using  Passive Infrared Sensor (PIR) Module. According the schematic like in figure 1 above that  the electronics is very simple and straight forward. In the prototype, only one white LED (3.6V/1W) is used as the light source. After construction, the whole circuit should be housed in a suitable enclosure. The finished unit can be used indoors or outdoors, and can mount to either walls or ceilings of the detection area. The tricky security light can be powered from any external 12-volt dc power source with atleast 500mA output current capacity. Since the input supply is 12-volt, it is possible to connect two – three white LEDs (in series configuration) in lieu of the existing light source. No more changes required here (except in the value of resistor R5), but you should remember to increase the output current of the external 12-volt dc power source upto the actual demand.

One component that very important as sensor is Passive Infrared Sensor (PIR) Module that the diagram is look like in figure 2 below.

Figure 2. Diagram of PIR Module / Electroschematics 

According diagram in figure 1 above that In standby mode, output from the PIR sensor module is 0V, the gate of T1 is at 0V level and T1 is off. Capacitor C1 is now charged via R2 and D1, whereupon T2 comes on so that the light source (LED1) is switched on. When PIR sensor module detects motion, T1 whose gate is linked to the PIR sensor module, cuts off T2, so that the light source turns off. However, C1 is discharged fairly slowly through R4, so that the light source is not turned off immediately (goes out slowly). This turn-off delay may be varied by altering the values of C1 and R4.

Note that, in a PIR sensor module, its output goes to high-level (near 3.3V) for a finite duration after the motion detection, and revert to low-level (0V) thereafter. This time period can be changed by adjusting the on-board potentiometer of the PIR sensor module (refer PIR sensor-related articles and tutorials published elsewhere in this website). Finally, resistor R5 limits the operating current of the light source (LED1). Prototype was tested with a 33-Ohm power resistor (33R / 3W) as R5.

Source: Electroschematics 

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