Infrared motion detector circuit
Description.
Here is the circuit diagram of an infrared motion detector that can be used to sense intrusions.Infra red rays reflected from a static object will be in one phase, and the rays reflected from a moving object will be in another phase.The circuit uses this principle to sense the motion.
The IC1 (NE 555) is wired as an astable multivibrator .The IR diode connected at the output of this IC produces infrared beams of frequency 5Khz.These beams are picked by the photo transistor Q1 .At normal condition ie; when there is no intrusion the output pin (7) of IC2 will be low.When there is an intrusion the phase of the reflected waveforms has a difference in phase and this phase difference will be picked by the IC2.Now the pin 7 of the IC 2 goes high to indicate the intrusion.An LED or a buzzer can be connected at the output of the IC to indicate the intrusion.
Circuit diagram with Parts list.
- Comparators IC2a and IC2b are belonging to the same IC2 (LM1458).So the power supply is shown connected only once.No problem.
- When there is disturbance in the air or vehicles passing nearby,the circuit may get false triggered.
- POT R5 can be used for sensitivity adjustment.
what about pin 7 in IC 555???????
Thank u all
what is the range of the transmitter? please can u tell me the formula for sensitivity ? if it possible to increase the range ? it can be applicable for hot body objects which emits IR rays ?
Hi Admin,
I’m doing this for my project and my due date is near. I’m facing a problem fixing the power supply. This is my first time facing a -ve voltage supply. Please enlighten me on how to connect it as my current way – by bringing two 12V supplies to parallel does not seem to work. Would I need a voltage regulator for this circuit?
Reply to Tracie
A +12/-12 V dual power supply circuit suitable for this project is shown below.
http://www.circuitstoday.com/regulated-dual-power-supply-circuit. Make this power supply circuit and connect it to the motion detector circuit.
If you have further doubts, then comment in here. I will give you a more detailed reply.
thanks.
admin
Do I have to construct that separate circuit for the power supply? I have DC power supply source at +12V and -12V, I am just not sure of how to connect it to the circuit. My due date for project is really near. The transmitter circuit is working but the receiver side does not. when I on the power supply and start to tune R5 and R7 to ring, it will keep ringing regardless of whether IR is emitted to the diode or not.
This is my first time constructing a circuit and I do have alot of things which I have not learnt to construct in college. Please enlighten me on this.
Thankyou so much.
hi Admin,
i’m doing this for my project (just like the others)… my problem is that once i turn the power on (i did the schematic you gave for a dual power supply circuit) the LED lights up immediately… what might be the problem… please help… my project is due a week from now… THANKS… in advance…
GOOD AFTERNOON
THANKS FOR THIS GREAT CIRCUIT, ITS BEEN REALLY HELPFUL. I JUST HAVE A FEW QUESTIONS. IS IT A MUST I USE THE LM1458? IS IT COMPULSORY I USE A PHOTO TRANSISTOR, CUZ, I BOUGHT AN IR DIODE AND RECEIVER. HOW IMPORTANT IS THE INDUCTOR? PLEASE CAN U GIVE ME A FORMULA SO I CAN MAKE IT MYSELF, I CAN’T FIND IT ANYWHERE. AND I NEED TO KNOW THE OUTPUT VOLTAGE, IS IT HIGH ENOUGH FOR A MOTOR?
THANKS FOR YOUR ATTENTION!!
hi Good morning, may i check that the circuit and all the pin is it correct?
“”"”TO ANA”"”"”"-i think the problem is when u power on the circuit it create signal in pin7.because this circuit work is based on two conditions,it’s like a OR GATE,when ic2a get a relevant frequency it’s works and prevent the signals to ic2b,if ic2a didn’t get the correct signal ic2b get a signal and amplifier it.so when u power on mean the the ic2a get relevant condition,i think if u focus the ir beam to photo transister it works properly.bye
Is there any wrong in receiver circut?
when i am applying power supply then led turn on.
L14G phototransistor will work in the circuit?
is L14F available?
plz help……as soon as possible.urgent.
I’m doing this for my final project. My due date is very near and I have a problem with the receiver circuit. The LED lights up as soon as the power supply is on. I couldn’t find the phototransistor L14F but I was told another one would work the same.is there any wrong with receiver circuit?
plz help. urgent.
Hi I have not yet tried this circuit, there is no load resistance for Q1. R4 should get shfted to emitter and collector should get connected to +12volt, i dont see any other problem.
L14G phototransistor will work in the circuit? L14F1/L14F2which will work?
L14F is available in kolkata?
plz give me information.
Hi iam also working for this cct as my project , but i dont understand that how 50k n 100k potentiometer work , why we r using it ? i dont understand , somebody help me ?
@ Anjum – Click on this link to know more
http://www.circuitstoday.com/potentiometer-and-rheostat-working-and-comparison
can i attach a relay on this circuit?? so that if it detact somthing the light keep lighting up
Hi Anjum 100K pot is for gain of the receiver. 50K pot is for threshold setting (once the input -ve voltage to pin 6 exceeds the -ve voltge value set at pin5 by pot 50K) the out put at pin7 will go high.
Hi Win you can use a buffer transistor say 2N2219 (as the IC output cannot drive a relay directly), connect a relay to its collector and +12volt supply rail. Do not forget the freewheeling diode for the relay.
SEETHARAMAN, Hi thanks for that, and i also want to use this 2N2219 buffer transistor with relay ,
i also have to give +12 volt supply to pin 7, which give power to buffer n relay ?
but when iam giving =12v to pin 8 n -12 volt to pin 4,
Is this necessary to give power to buffer n relay separately ?
Hi Anjum You need not connect +12volt to pin no7. you connect the base of 2N2219 to pin7 of the IC (if you feel a resistance is a must use a 100ohms between base and pin7 of the IC). and emitter to 0 volt. collector to relay and relay to +12 volt. whenever the in put signal is available to the receiver out put at pin7 of IC will go high (an active element in side the IC between Pin8 and Pin7 will conduct to give an output at pin7)that will make the trasistor to conduct and relay will come on.
HI Its necessary to give +12volt to transmitter , we cant give it 9 volt battery ?
SEETHARAMAN: As you know that infrared and photo transistors dont show or give any indication .. for that purpose(b/c its cant be seen from humen eyes) i have to put buzzer or any led or any thing , but the think is that i want to run my circuit as the infra red transmitted its rays and photo transistors recieve at the reciever end , actually i want to run my circuit when the connection b/w infrared and photo transistor break( mean some body walk out b/w the connection of ir and photodiode) then buzzer or led give some response .. so that we can called this circuit infra red motion dectector .. plz give me your response soon , i dont have much enohgt time …
Hi Anjum you can use 9 volt battery for the transmitter without any modification, use only alkaline for longer life. Regarding your requirement, IR ray generated by the transmitter falls on IR sensor L14F, when the signal breaks the voltage at pin6 of IC2a will go positive and IC pin no7 will go low hence the relay will get de-enrgised. you can use normally closed contact of the reay for the purpose. if you want the relay to come on during ray interruption inter change IC2a pin 5 & 6. That will reverse the operation. Hope I am clear.
You are saying that if i interchange pin5 50k pot to pin 6. n in pin 6 work as the pin 5 is working . then when interuption is perform b/e ir reciever n photo transistor , then buzzer start its response .
i have completed this circuit , but 1 think is that i havnt put buzzer in pin 7 .
Hi Anjum please go ahead and give further feed back. thanks
thanks seetharaman for your reply! so i need to connect a 2N2219 than connect to e relay? btw how many voltage relay do i need?
Hi Win you have use additional transistor(2N2219) because the IC cannot drive a relay directly since its maximum drive current is only 10mA.
as the power supply for the circuit is 12volt, you can go in for a standard relays available in the market 12volt with a coil resistance of 100 to 120 ohms. (you can even connect a 12 volt electronic siren to 2N2219 collector directly, without the need for a relay)
hi,ADMIN
please give me the details of transmitter circuit. its working principle. plz..
SEETHARAMAN:There is the problem in reciever circuit . iam giving 10k potientionmeter to pin 2 of the reciever, but its giving same voltage at pin 7 has . why is so ? plz reply me as soon as possible , my transmiter is ready , but reciever has problem , pin 7 never go low or high its give me same voltage , as coming as from pin 2. plz solve this problem as son as possible . Iam in Hurry
and 1 thing more can i use “ir reciever” instant of L14F
Hi Anjum you please refer to my April 12 th feedback on load resistance for Q1. You can use any IR sensor available in the market for TV remote receiver. I am using that only. a 3 lead device with no marking on it costing around Rs20/-. As an alternate You may connect the emitter of the sensor to ground and take the signal from its colector and load resistane R4. this is what i have used for my IR remote control checker.
I request ADM to reply AVI’s request.
Great circuit. I’ve been looking for such circuits for doing my collage project and I found some good circuits on Circuits today and CircuitSector…thank you very much
I am one of the fans of circuitstoday.The circuits that has been displayed are really helpful for doing projects
this is a nice circuit for beginners and hobbyist alike i hope there will be a similar ckt for IR door or garage opener with the IR’s located on the same position,jst like the entrance opener on malls thank you
Hi.. Can anyone Please tell me the Series of (8-pin, 5-Bit) Infrared ENCODER and DECODER IC which should be easily available from market….
I need a separate IC for Encoder and Decoder.. I’ve searched a lot but can’t find any…
Please help me guys…
thanks fpr your best articles.
can you make the fish caller please
Hi Dedi You may try the following circuits
http://www.sentex.ca/~mec1995/circ/fishcall.html
http://media.gibsontron.com/9918np.pdf
What is L1 ( 10uH )
Hi Ponting it is an inductor L1 with capacitor C3 forms a tuned amplifier for IR frequency.
Thank you very much for this circuit,i wanna use it in my project and i hope it shall work fine.
please send me coding of the motion detector and can we do MD in visual basic pls help
can i used my old ir receiver from olt stock tv?also can i use lm339 as a voltage comaparator on d receiver stage??pls help me guys…tnx
to ANA and AVI…i think d circuit is working,coz any moving object near the circuit,reflects ir rays and it will pick up by d rcvr side..try to leave the room a moment den observed d output..that is wen der is intrusioun/moving around/near the circuit,led is ON,its OFF wen nothing around..
hi..i am doing this as my project..bt i think the connection L14F is incorrect…i guess this has to be connected in common collector mode right??
also pls explain the detailed function of Lm1458 in the receiver side…is this circuit tested??
Hi KT kindly go through my april 12th comment on L14F connection.