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Remote Control Circuit for Multiple Appliances

Last Updated on by 79 Comments

The post discusses a simple IR remote control circuit which can be used for controlling many appliances independently through a single transmitter handset. The idea employs ordinary components like IC LM567, IC 555 and does not incorporate microcontroller devices. The idea was requested by Mr. Saeed Abu and also other dedicated readers of this blog.

Technical Specifications

bro thanks for ur reply. Pls develop a simple Infrared (IR) Remote Transmitter/Receiver Circuit diagram.My requirement is:



1) It must be specified for its transmitter.No interference with Tv/Vcd remote or any other type of remote.

2) It(receiver) should be powered by Ac 220v.

3) It(receiver) can be used for multiple load(Light+Fan+..+..) by one transmitter

4) Please develop it very simple.



The Circuit Design

The following design depicts the basic IR receiver module using the IC LM567. The involved stages can be grasped with the help of the following points:

The IC LM567 which is a tone decoder IC or more simply a frequency decoder IC is rigged to produce a particular frequency determined by R3 and C2.

This frequency becomes the bandpass frequency of the circuit such that the circuit now gets locked on this frequency.

The input pin#3 of the IC is attached to a photodiode device for receiving an IR signal which may be tuned to the above set frequency of the IC.

This means that the circuit will now respond whenever D2 detects an IR frequency tuned to the frequency determined by R3/C2 of the configuration.

On detecting a coded frequency from a relevant transmitter the IC M567 output pin8 becomes low and stays in that position until the transmitting signal is prohibited.

Thus this circuit becomes the receiver module and may be triggered by a transmitter circuit tuned at the relevant fixed frequency.

The IC2 which is a Johnsons decoder divider IC is wired as a flip flop circuit, it's integrated to pin8 of the IC LM567

As long as no signal is detected by D2, pin8 of IC1 remains high, the moment a signal is detected, T3 is triggered, which in turn triggers pin14 of IC2.

The above situation prompts IC2 output to change state thereby either activating RL1 and the connected appliance or deactivating them depending upon its initial condition.

For controlling multiple gadgets using a single transmitter handset, many of the above modules may be constructed and integrated with the corresponding appliances for the intended switching.

Circuit Schematic

Controlling multiple appliances using the following single IR transmitter circuit

The following circuit forms the transmitter module of the proposed IR remote control for activating multiple gadgets.

It's a simple IC 555 astable circuit, whose output frequency is determined by the 5 individual capacitors and should be appropriately matched with the particular receiver circuit modules as discussed in the above section.

The capacitors attached with the respective buttons should be calculated and matched such that on pressing the relevant button, the corresponding receiver gets triggered for toggling the corresponding appliance.

R1, R2 may be chosen arbitrarily, but Cz must be selected in accordance with the receiver module frequency determined by R3 of the module.

Multiple Frequency Transmitter Circuit

 

Reader Interactions

Comments

  1. hi it’s oz your favorite locksmith lol
    is there a way to build an IR blaster that can connect somehow to the alexa platform
    and allow alexa to be “programmed” to control multiple devices like cable box, tv, dvd players, xbox?

    Reply

  2. Hi Swagatam
    Can you please tell me how much R3 would be in K ohm.
    For 10 Khz.
    And could I replace R3 with a fixed resistance with a adjustable resistance in series.

    Reply

  6. Hi Swagatam
    I have been experimenting with the LM567 as I want to build a IR gate lock, I have tried the circuits on here and elsewhere with limited success, but I am making progress in the right direction. I built this one tonight and yeah I have a winner,sort of. The problem I have is with the transmitter, I am powering it from the same voltage source as the receiver circuit and when I power it with its own separate power source it fails to register with the receiver. Just wondering if you shed some light on this problem.
    Regards
    Geoff

    Reply

    • Hi Geof, if the circuit is responding only when a same power supply is shared by the transmitter, then I am afraid that's not correct because that implies the LM567 frequency could be leaking through the power supply into the 555 IR diode and transmitted back to the LM567 receiver.

      The transmitter should be able to make the Rx work using separate power supply or a battery.

      I think the IC 555 frequency might not be matching correctly with the LM567 frequency….did you verify whether the frequencies of the two modules were exactly similar or not….please confirm this first in order to assess the operations correctly.

      Alternatively, if you have a spare LM567, you can use it as the transmitter by using identical RC components as used in the receiver unit, this would enable a perfect matching of the frequencies and thereby utilization of separate power supplies.

      Reply

  7. Sir,
    Is it possible.. to make remote control home appliances(more appliances control by one remote) by using Encoder-Decoder…

    If possible then help me by giving the circuit diagram & instructions.
    Thank you..

    Reply

    • Narottam, yes it's possible, but it's better to buy the module than of making at home, since the readymade version is perfectly optimized and assembled on a good quality PCB.

      You can buy a 4 relay or a 8 relay module and wire them with the respective appliances…..all these could be operated from a single remote handset having 4 or 8 buttons.

      Reply

  9. Sir,
    I tried to make this but I did not success.
    So, I want to make a simple remote control home appliances only control a single appliance and as remote I want to use CR2025(this is a remote control of small audio amplifier machine, 21 bottoms).
    So, please help me….

    Reply

  10. Sir, I want to make a circuit with multiple mode operation.

    For example, I want to design a remote with two buttons and two different outputs.

    For that I am using to use same transmitter circuit as yours. With two different Czs. Of frequencies 38 KHz and say, 40 KHz.

    If I use two different TSOP circuits at the receiver, that is TSOP1738 and TSOP1740, will that work?

    I am planning to connect 1 uF Capacitor at the output of both the TSOPs.

    Thanks in advance.

    Reply

    • Chaitanya, I think that would work only because of the presence of the LM567 IC…which will effectively distinguish the two frequencies and allow only the selected one for the particular set….so I think that will do…

      Reply

  12. Hi Swagatam,
    In this circuit, the transmitter has 5 capacitors, each one with its push button. You have named them Cz…. are all 5 the same value? Or are they all of diferent values?

    Best Regars.
    Nélio

    Reply

    • Hi Nelio,

      All the capacitors needs to be of different values, so that different corresponding frequencies are generated through the selection, assigned for controlling the relevant appliances individually without interference.

      Reply

  13. Hi Swagatam,
    I'm looking for a circuit that could control a 12V DC fan, during a specific period of time after power-off (therefore a battery and charging circuit would have to be present as well). In other words, when power is applied, the fan would run and at the same time the battery would be charged. As soon as power went off, the fan would cotinue to run during a time set, in minutes. I don't supose you have something similar, do you?

    Best regards, and keep up the good projects…
    Nélio

    Reply

  14. Hi Swagatam,

    Thanks. Can you let me know the range of frequency that I have to target. Currently, I have no idea about the frequency at which the emitter and receiver can operate.

    Thanks,
    Vijay

    Reply

    • Hi Vijay,

      did you tune the 555 frequency with the LM567??

      the 4017 configuration presented by me is correct and foolproof…I have used all the outputs of the 4017 so that accidentally the output trigger may not get lost across the 10 outputs…this feature is not taken care of in your linked circuit.

      I'll be deleting this comment because of the external link you have included in it.

      Reply

    • …in my circuit just connect the pin15 to ground through a 1M resistor and connect a 0.1uF cap across pin15 and positive…this will never allow the IC 4017 to trigger the relay on switch ON

      Reply

    • Hi Swagatam,

      Thanks. I'll try that with the 4017. And yes I did tune the LM567 and it correctly works because if I press the button (within 10-12 cms), the relay energises and deenergises. I would like to know how I can increase the range.

      Thanks,
      Vijay

      Reply

    • Hi Vijay,

      "tuning" means that the IC 567 will respond only to the tuned frequency and not to any other frequency, did you confirm this?? because if it's tuned correctly then it will respond over greater distances comfortably.

      you can try the same with your TV remote and see how it works.

      Reply

    • Hi Swagatam,

      Yes, I did conform that the IC 567 responds only to the tuned frequency and not to any other frequency. But the range is the problem. As I couldn't source BP104, I used an IR receiver LED (that looks like a normal LED but darker in colour. The IC doesn't pickup the TV remote signal as I haven't yet tuned to that. But I tried a different circuit with TSOP and it does pickup the TV remote input but I wanted something that doesn't pickup signals from remote controls as TSOP is too sensitive.

      Thanks,
      Vijay

      Reply

    • Hi Vijay,

      for experimentation, try 12V with the IC 555 circuit but make sure to use a 1K resistor in series with the photodiode, it could be the low voltage which is not allowing the LM567 to detect the signals from a greater distance.

      if still the range does not improve, then you can try replacing the LM567 photodiode with TSOP…it will not pick the TV signals once it's tuned with a different frequency and matching with the 555 circuit…try these and see the response

      Reply

    • Hi Swagatam, thanks and I'll do that. I always thought that the TSOPs respond only to a certain frequency (for ex 38KHz) and not anything other than that. If a TSOP can pickup the frequencies I'm trying, that would be great.

      Regards,
      Vijay

      Reply

    • Hi Vijay,

      yes that's correct, TSOP are designed to pick only between 30 to 40kHz, but we can modulate this frequency with another frequency for making it unique, first check it with LM567 at its specified carrier frequency if it works for greater distance then we can modify it differently.

      Reply

  15. Hi Swagatam,

    The LM567 datasheet says the max power supply voltage is 9v. Are you sure we can use 12v? The datasheet also says it can run at 5v. Can I? Because, I would like to run it at 5v.

    Thanks,
    Vijay

    Reply

  17. Sir,
    If the transmitter circuit frequency are 218.59 Hz and recever circuit frequency are 217.76 Hz then it will work or not ?
    Actually I'm trying to say that the both frequencies are same as point to point ?

    Reply

    • Narottam, I am not sure how accurately the IC is specified to detect the frequency…you can check its datasheet to find the level of accuracy this IC may be featured with, however a difference of 1 Hz might be too less and the IC would not be able to differentiate this minute difference

      Reply

    • Bro, it's not yet tested, but if were to make it I would succeed with the results 100% sure, the design is very obvious and there's no way it can fail….but it's not for the newbies, if a newcomer tries it there could be a 100% chance of failing…

      Reply

  22. Dear Swagatam,

    As you said in the circuit request:
    – It(receiver) should be powered by Ac 220v.

    But it is clear form the circuit that the IC need an external 12V DC source ?

    How I can do it without external power source or with 220V AC

    Reply

    • you will have to do it by calculating and also by practical testing through trial and error. I cannot provide the values because the calculated results and practical results could vary and may not precisely match.

      Reply

    • frequency for each LM567 module may be fixed by using the following formula
      F = 1/R3xC2

      Accordingly to get a matching set, the relevant capacitor from the 555 may be determined by using a online 555 frequency calculator.
      R1 and R2 may be selected as 220K

      the idea is to select a slightly different frequency for each Tx/Rx set with each set having an exactly matching frequency, this matching or pairing can be also done by using a frequency meter.

      Frequency measuring option is normally available on all digital multimeters.

      Reply

  32. dear swagatam,
    thank you for your help.
    can you tell me if i can to use another IC instead the 4017.
    in this moment i haven't this component.
    thank you so much
    regards andrea

    Reply

  33. dear swagatam,
    seen that the 4017 is connect as an flip flop, it can be replaced with another IC for example the IC 4047 or ne555?
    for to activate more appliances i must to built more received circuit of first diagram?
    on the first diagram the value of R3 depend from the frequency for set, but in that order of values?
    d1-d6 can i use 1n4148 or what other type?
    thank you so much
    best regards
    andrea

    Reply

    • dear Andrea,
      no, 4047 or 555 cannot be used for 4017
      yes more receivers for more appliances
      R3 will need to be made different for different receivers
      d1-d6 = 1N4148

      Reply

  34. Hi Swagatam

    For an astable 555 vibrator, the timer will oscillate only when the timing capacitor is connected. The momentary connection due to the pressing of the push button will allow the oscillation momentarily…….in practical there will be oscillation for only a fraction of a second or no oscillation. And I wonder, if that momentary oscillation will trigger the receiver module.

    Reply

    • Hi Abu-Hafss,

      yes momentary connection is what we want from the transmitter…if it's pointed correctly toward the receiver, the response will be instant, moreover the user has the option of keeping the button pressed for a few seconds until the receiver responds

      Reply

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