Introduction: Make an Simple Motion Sensor Light! (PIR)
Make an Small & Simple Motion Sensing Light with Less Hassle and Less Components.
A Beginner Could Also Make This.
A Simple Understanding of how transistor works and knowledge of Anode and Cathode is only needed so Make it Tension Free!
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.
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 will accept 12v.
Step 3: Breadboard Circuit
For Those who want to build it on a Breadboard.
Step 4: Eagle PCB File.
Just Print the Pdf Attached.
and i will be using the Toner Transfer Method.
it would be your choice which method you will choose because end result would be same.
Step 5: Transfer the Artwork
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.
Question 8 months ago on Introduction
Is there any chance you'll add more features to this:
- turn-off delay
- light sensor (making it only power the LEDs at night
- variable LED brightness
9 months ago
ERROR: the LEDs on the breadboard are positioned backwards. + and - are reversed
1 year ago
I built this on a perfboard, but no matter what voltage I supply there would always be only 3.3V at the LED. I tried 4 batteries (=5.5V) and a 12V 1.5 A power supply. I double and triple checked my wiring. It is as described in the instructable.
Reply 1 year ago
The output of the pir will only ever be 3.3-5v
Question 1 year ago on Step 3
Just the project I'm looking for. But I need it powered by 9v and only 2 leds. Thank you for sharing
Question 2 years ago
I’m a beginner and I’m confused how to power it can someone help thanks
Answer 1 year ago
you could use a 9V block with only 3 LEDs. There are adaptors for these batteries that have plus and minus leads.
Or buy a battery holder for 4 regular 1,5V batteries if you want to power 4 LEDs. These ususally have plus and minus leads integrated.
Question 1 year ago on Step 13
Hey, great project.
However, could you tell me where to add the power source?
Answer 1 year ago
Connect power + to Vcc (red wire) and connect - to GND (black wire), according to The breadboard photo at step 3.
Question 2 years ago on Step 2
I made this but when I power it up the led lights up! why
Question 2 years ago on Step 2
Can we use motor(1.8M) instead of leds?
Question 3 years ago
What are the measurements in mm?
Question 4 years ago on Step 3
Will this circuit work with less than 12vdc example 3vdc using one LED instead of the four?
Question 4 years ago on Step 6
Hey so I was wondering how much hydrochloric acid and how much hydrogen peroxide do we mix in? I have no idea since I do not have any Ferric Chloride at the moment.
Question 4 years ago
Pls I want to build a power bank for my computer pls i need your on de components
Question 4 years ago on Step 2
I want to custom made a motion sensor and dimmer for led strip.
Sensor range max 20cm
The led strip is 24v DC
Here is a link to the sensor with only 15cm range.
Check out this product on Alibaba App DC12V - 24V 3A Hand Wave mirror Sensor Dimmer Switch for Mirror Light
Question 5 years ago on Step 13
How small is the sensor?
Question 5 years ago on Introduction
What is the cost of this project...
Question 5 years ago
could i power a 12v LED strip in place of the 4 four LEDs
5 years ago
Can you please help me with the circuit diagram,As
I have 3.7V lithium ion battery and i want to glow 4 v led strip.
So which circuit would be good enough so that i can receive full illumination from led strip.
and in some lights there is on function coming , that if there is no motion than the brightness of led light decreases but if suddenly any motion is detected than it illuminates to full its full brightness.
So please let me know ASAP.