The article discusses a simple IR remote control circuit which is configured for operating a DC motor in response to the switching made from a standard IR remote handset such as a TV remote or a DVD remote.
The connected motor can be moved either ways and also can be made to halt.
The circuit may be understood with the following explanations:
How it Works
As can be seen in the given circuit diagram, the sensor is any standard three pin IR sensor module which would typically respond to any TV IR remote handset.
When an IR (infra red) beam is focused at the sensor, the pin which is designated as the output becomes logic low. This situation persists as long as the beam remains focused at it.
The transistor T1 which is a PNP responds to this logic low signal and conducts switching the attached relay RL1.
The contacts instantly connect the instantaneous positive potential at the collector of the transistor to pin#14 of the IC1 which is wired as a flip flop circuit.
Assuming the initial logic sequence to be at pin#3 of the IC, the above triggering shifts the sequence to pin#2 of the IC, making it high.
This switches ON T2 and the corresponding relay RL2.
RL2 conducts and connects the particular wire of the motor to negative supply. Since the other terminal of the motor gets a positive from RL3, it starts moving on the set direction.
Now suppose, the sensor is given a subsequent trigger through the IR remote handset, the above process repeats and the output sequence shifts from pin#2 to pin#4 of IC1, which instantly switches ON T3 while switching OFF T2.
The above action reverts the relay connections forcing the motor to instantly flip its rotational direction .
With another subsequent trigger from the remote handset, the sequence bounces of back to pin#3, which is not connected to anything and results in switching off of the motor completely.
The inclusion of L1, C1 ensures that the circuits does not get influenced with spurious triggering of the sensor.
L1 can be experimented to get the optimal value so that it "grounds" only accidental stray external signals and not the actual IR signals from a remote control handset.
Parts List for the above IR (infra red) remote controlled motor circuit.
R1 = 100 ohms,
R2 = 1K
R3,R4,R5,R6,R7 = 10K
C1, C4,C6 = 100uF/25V
C2,C3, C7 = 0.22uF
C5 = 1000uF/25V
C6 = 0.22uF
L1 = 100mH choke
T1 = BC557
T2,T3 = BC547
D1---D7 = 1N4007
IC1= IC4017
IC2 = 7812
All relays = 12V/400 ohms/SPDT
sensor = TSOP1738
Motor = 12V Dc motor
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David Castro says
Hi, I am a student and I'm willing to try this project; what about if I want to control two 24V motors? Can it be done with same remote controller?
Thanks for your attention and kindness
Swagatam says
it may be possible with a small modification.
isolate the relay coil positives from the relay contact positives.
connect the relay coil positives with the 7812 12V output, and connect the contact positives with the +24V source which could be from the transformer output
alikhan saadat says
hello
i can not find in library Proteus TSOP1738
plz help me or send me library file TSOP1738 in my email:Alikhan.saadat1@gmail.com
Anonymous says
Hi Sir, can you use an 8051 Microcontroller instead of the Ic? If so how would the circuit diagram look like?
Swagatam says
you will have to program the IC exactly as the 4017 IC is designed to function in the above shown circuit, then the transistor driver stage could be used identically with the 8051
MUHAMMAD ASYRAF says
hello sir,can i set the time at ir sensor to make the motor function? that's mean when ir sensor blocked by something at certain time and then circuit will start function.
Swagatam says
hello muhammad, the above circuit will not work as per your requirement, you may have to replace the 4017 with a 555 IC monostable circuit for fulfilling it.
Jayanath Ranasinghe says
RL1 is continuously triggering what is the wrong with my circuit?
Swagatam says
remove RL1 and connect the collector of T1 directly at the junction of R3/R4 and check the response
initially do not connect the motor, only check the RL2/RL3 triggering by toggling the transmitter handset.
KHODAL DHAM says
hello sir,
i want to rotate the 3 hp induction motor in both direction by wireless remote for the farm house gate..
so motor may be operated through contactor and contactor operated through relay..
so please suggest the circuit for this project..thnx..
Swagatam says
Hello Khodal,
I'll try to find a suitable circuit for it, if possible, and post it soon.
Jayanath Ranasinghe says
any resistor values to be reduced?
Swagatam says
no, not required.
Jayanath Ranasinghe says
what are the modifications to be done for 6v supply?
Swagatam says
only the relays will need to be changed to 6V
Muhammad Ahsan says
plz give me a complete circuit diagram of universal tv remote and its working with out using any IC only 555 can be used , its urgent , i have to make a universal tv remote , its my project.
Swagatam says
I am sorry, I don't have this circuit right now with me.
Rony says
Nice project keep it up 🙂
Swagatam says
thanks!
Zubin Bekawala says
Swagatam Sir, u r really n inspiration for i am student of class 12th sci….n i want to make a remote contorled robot which jst have to move forward n backward not more than that can u plz help me out for science fair…!!!
Swagatam says
You are welcome Zubin,
The robot will only roll forward/backward, right/left on wheels, will that be enough?
Making it move on legs will be very difficult.
Anonymous says
Is this circuit realised? because when i tried to simulate it in multisim i did not get an output?
Swagatam says
remove RL1, connect collector of T1 at the junction of R3, R4, and check it now.
siraj shaikh says
hi
thank you for your precious reply!
I don't have L1 so can i make it on my own
Swagatam says
I think it won't be required, you can carry on without it.
siraj shaikh says
thanks for your reply
where should i connect the battery ,what should be the voltage
i have a doubt , is the relay 1 connected correctly
what is meant by spurious operations
what is that l1
Swagatam says
Battery voltage should be 12V
remove IC2, interconnect the IC2 pin1 and pin3 with a wire link.
connect battery (+) to this line (pin16 of IC1)
connect (-) of the battery to pin8 line of IC1
spurious means unwanted disturbance
L1 is a 100uH choke coil, may be removed if you don't get it
siraj shaikh says
thank you very much for your reply
i made the above circuit but it was not working i didn't connected L1
i have made it on bread board
the voltage across pin #2 of IC was 2.5 V and across pin #4 of IC it was 2.5 the relay 1 was not working i powered the circuit by using 4 lithium ion 3 V cells
Swagatam says
If the sensor receives and responds to the signals then the relay will surely operate.
In the diagram, RL1 coil's lower pin is not connected to ground, please connect it to ground.
If still it doesn't work, then remove R5 link from the relay contact and connect it directly to the collector of T1
Swagatam says
I have made some modifications in the diagram , please do it as per the new diagram, you may connect junction of R3/R4 directly to T1 collector if RL1 doesn't respond.
siraj shaikh says
hi,
thanks for your reply
should i connect the collector of T1 to negative
i connected collector of T1 to an LED ,it was blinking but when i connected relay it remained malfunctioning what should i do now
Swagatam says
Connect T1 collector to the junction of R3/R4.
siraj shaikh says
hi
can it work without mains suply that is with a battery
Swagatam says
yes it will work with battery also
eee says
hey impressive work very interested but the relay 1 what is its purpose and from where does it get the 12v supply?!?
Swagatam says
Thanks, RL1 is powered by the transistor but the emitter should be connected to the 12V supply, I'll correct it soon, the relay being less sensitive by nature will respond only to strong, and legit signals and thus will avoid spurious operations.
Swagatam says
instead of connecting the emitter to main positive, I have made IC2 a 7812.
riyaz says
I know it might be a stupid question or is clear from the diag but what is the tranformer rating and the output voltage and current from the rectifier side?? thx a lot for support.
Riz
Swagatam says
It should be rated according to the current rating of the connected motors.
Jeaneer Jay Matalines says
Is it alright if my DC Supply is a 9V battery like an eveready ? i will try increasing the capacitor sir, thank you very much for the replies 🙂
Swagatam says
If the load is an LED or a buzzer then a PP3 9V battery will do.
Jeaneer Jay Matalines says
Hello Sir , good-day , I am Jeaneer Matalines from the Phil. and i would like to make the SCR Security Monitor System that you have posted in : www.brighthubengineering.com/diy-electronics-devices/121484-simple-thyristor-circuits-explained/#comment-372635225
My problem sir is that i don't know what equipment will I use in the touch trigger, it would surely help me if you would reply to my message,
thank you sir 🙂
Swagatam says
Hello Jeaner,
You can use an ordinary screw as the sensor point, connect it with the trigger point, and use its head as the touch pad and for triggering the circuit.
Jeaneer Jay Matalines says
Thank you for the reply Mr. Swagatam Sir, I have another problem , My circuit is not working i don't know why but i followed everything on the circuit diagram , i have change the SCR C106 to another Gate Sensitive SCR that can be bought in our electronics shop is that maybe the problem why the circuit is not working properly ?
Swagatam says
You can try increasing the capacitor value which is connected at the base of the transistor….may be to 10uF/25V, and then test the response.
riyaz says
I am very much interested in this circuit but i have some doubts.
– What is the motor which is used in this circuit and what kind of motors can be controlled using this circuit.
-What is the Transformer used in this project and the output rectified voltage.
-What is the connection in the relay parallel to the diode
– what is the availability of the sensor TSOP1738 is it possible to scavenge it from any common appliance
thanks a loot you are a great inspiration. i am a student so sorry if some of these doubts are common sense.
Swagatam says
Thanks!
I think I have explained everything in the article……. you can refer the parts list for the part numbers.
The relay coils are connected parallel with the diodes.
you can Consult the parts dealer he would know better regarding the availability of the parts.
riz says
What kind of motor's can be controlled by this circuit?
Swagatam says
DC motors.