Simple Motion Sensor Light! (PIR)

Step 1: Gather the Parts

One can Buy Everything Used in this Project from Ebay.

While i Get most of the Things from my Local Electronics & Robotics Store so i don't buy from ebay.

Anyways , Here is the List of Parts which are Needed :

1) PIR Motion Sensor. ( Main Part , i am using HC-SR501 )

Note that every PIR Manufacturer might have a Different Pinout. So Please confirm the Pinout of PIR Before Performing this Project. [ My PIR Had Pinout - VCC | Output | Ground || (From Back Left to Right Direction) ]

2) BC547 NPN Transistor

3) (4 Pcs.) White 5mm Leds

4) Small Copper Board

5) 2 Pin Screw Terminal

6) 3 Pin Right Angle Header

Step 2: Circuit

A Simple Circuit , Controlled by two major Things.

1) BC547 Transistor

2) PIR Motion Sensor

This Can be Done on Perfboard too.

Explanation :

When PIR Sensor sense any Human interference or ir Light running @ 38KHz

then it's Output Pin Become from LOW to HIGH which result in 3.3v Supply in Output Pin,So We Would be using that output pin to switch the transistor on and off which will lead to On and off of leds too.

Leds are Connected in Series So that they would consume all 12v Supply once switched and which would not lead to burning.

Note : Only Supply 12v , If Voltage Greater than this than it will lead to burning of leds.

and PIR has an in-built Regulator which accept 12v.

Step 3: Breadboard Circuit

For Those who want to build it on a Breadboard.

Just Press Hardly with an iron with full High Temperature Dial for 4-5 mins.

After this immediately dip into Water and Gently Rub the paper on pcb with your thumb.

The Artwork must have Attached to Pcb.

Otherwise if traces are broken then try again.

Step 6: Etch It!

Now put the PCB in Ferric Chloride.

You may use HCL+ Hydrogen Perxide too.

Step 7: Drill Holes.

I use my Hand Drill to drill holes.

it was just useless drill bought from ebay for 2$ , Got it's Spring loose after making 15 pcb's

So, I am switching to a motorized drill for my future projects. ;)

Step 8: Solder Screw Terminal

Make sure to drill with 1mm bit for this because they have a kind of broad legs.

Step 9: Solder Right Angle Header

Step 10: Solder Leds.

I Use white because 3v x 4 leds = 12v

which will not burn the leds.

and make sure the Anode and Cathodes of leds.

Step 11: Solder the Transistor

Be sure to face the flat side of transistor towards leds.

Step 12: Solder the PIR

Till now you might have known that why i soldered the right angle header.

it was soldered to position it motion sensing part towards our self.

Step 13: Power It.

Now power it with 12v.

Give the sensor a warm-up time of 10-60 Sec.

And test it.