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You are here: Home / Remote Control / 433 MHz RF 8 Appliances Remote Control Circuit

433 MHz RF 8 Appliances Remote Control Circuit

Last Updated on March 16, 2021 by Swagatam 83 Comments

caution electricity can be dangerous

The post explains a circuit which can be used for controlling 1 to 8 appliances with a single RF 433MHz remote control handset. Now you can control fans, lights ACs, oven etc within a range of 50 meters with the same remote.

In a few of my earlier posts I have comprehensively discussed regarding these versatile and outstanding remote control modules, for reference you may want to go through the following links:

Simple RF Remote Control Circuit without Microcontroller ...

Make a Hi-End RF Remote Control Circuit | Electronic Circuit Projects

RF Remote Control Encoder and Decoder Chip Pinouts Explained ...

Main Features of 433MHz RF Remote Module

The main features of these 433MHz remote modules are:

1) These are available with different ranges, from a single channel to as many as 8 channels, which allows the user to use 8 different appliances from a single receiver unit.

2) The technology used for transmitting the RF waves are extremely sophisticated which prevents the transmitted data from getting hacked.

3) The distance of transmission is also diverse, ranging from 50 meters to 5 kms.

4) Fully customizable "address pins" which enables us to use different remote control handsets with a single receiver unit or vice versa

Although it provides us with the facility to control 8 appliances from a single RF module, as discussed in the feature no#1 above,  this isn't entirely convenient because since all the 8 relays are fixed in the given receiver board could mean a lot of wiring to be done for different appliances situated at different corners of the house.

This slight inefficiency accompanied in the system compels us to think of some alternative method which would allow us to employ individual single relay modules with the desired appliances and then toggle these individual modules through a single remote handset. This option looks much hassle-free as no extra wiring is required for the installations.

Yes, that's what we would be trying to implement by exploiting feature no#4 by customizing the address pinouts of the transmitter module as well as the associated various receiver modules.

Before jumping into the circuit design it would important for us to discuss how these address pins of the transmitter/receiver are related and maybe customized for specific applications.

How Address Pins Function

If you notice the decoder chip of the transmitter module and the encoder chip of the receiver module you will find that both these ICs include 10 address pins (A0 to A9). These address pins are directly compatible with each other, meaning configuration of the transmitter and the receiver address pins should be exactly similar in order to make them respond with each other.

For example suppose if only A0 address pin of the transmitter circuit is connected with ground then the only A0 of the receiver must be connected to ground for enabling the two counterparts to "talk" with each other.

In this proposed article where we are discussing how to control 8 appliances with a single remote control we take the advantage of the above explained "address pin" feature and configure 8 different receiver modules with a single transmitter remote handset.

The following example circuit illustrates the address pin configuration of the relevant Tx and Rx modules. Here we have employed a 4 channel remote module, however a single channel module could also be employed for getting the same results, just by modifying the indicated address pins of the units.

The Receiver Circuit

The following image shows the basic configuration of the receiver module. It shows the remote control application set up for one of the 8 appliances. Similarly, 7 more receiver modules need to built for enabling the control of the associated relevant appliances.

For all the 8 units only the address pins need to be differently configured by simply changing the pin connections with ground, meaning if A0 is connected to ground for the 1st module, then A1 needs to be connected with ground for the 2nd module, A2 for the third module and so on.

Rx Schematic

433 MHz RF 8 Appliances Transmitter Circuit

The IC 4017 section forms the flip flop circuit which ensures latching up of the load in ON and OFF conditions alternately, in response to the remote button press.

The Transmitter Circuit

The following image shows the single remote control transmitter for the 8 separate receiver units as explained above.

Here pressing only the A0 switch activates the above shown receiver unit, since the A0 in the above design is connected with ground, therefore when A0 switch grounds its own A0 pin, both units "shake hands" and the signal is processed for toggling the appliance.

Similarly, switches connected across A1 toA7 can be made compatible with the remaining 7 receiver units for enabling the ON/OFF control of the attached 7 appliances located across different premises.

The diode network associated with the below shown transmitter unit makes sure that the BC557 activates and simultaneously powers the circuit only whenever the relevant switches are pressed, and otherwise the transmitter circuit remains completely switched OFF...this feature allows the battery to last for a very long time.

Tx Schematic

Please connect pin#13 with ground so that the Tx is able to send signal to the corresponding pin#13 of the Rx unit

If you any further questions regarding how to control 8 appliances or multiple appliance with single remote, please feel free to ask them through your valuable comments.

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Reader Interactions

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  1. Obinna says

    February 22, 2022

    Sir thanks for your site and care,pls I need complete circuit of 4 channel remote control to turn on and off my 4 different home appliances any time I need them

    Reply
    • Swagatam says

      February 22, 2022

      Obinna, the schematic for 4 channel remote is already explained in the above article…..you just have to configure the pin#10, 11, 12, 13 accordingly.

      Reply
      • Obinna says

        February 23, 2022

        Sir am a beginner in electronics so what I saw in that diagram is one relay and I need 4 relays as 4 channel controller so please where can I fix the other three relays

        Reply
        • Swagatam says

          February 23, 2022

          Obinna, you will have to build the following circuit, and connect the A, B, C, D points with the 4 separate 4017 IC flip flop circuits.

          https://www.homemade-circuits.com/simple-100-meter-rf-module-remote/

          Reply
    • Filippo says

      July 13, 2022

      Sir thanks a lot for this article. I have a question: if I press two or more switch at the time, the receivers go on/off simultaneously or there is a sort of priority?
      Thank you again.

      Reply
      • Swagatam says

        July 14, 2022

        Hi Filippo, the receivers will switch simultaneously when more than one button is pressed.

        Reply
  2. Emmanuel says

    January 30, 2022

    Sir please all the ic in those circuit are they already programmed or should I be the one to program it myself

    Reply
    • Swagatam says

      January 30, 2022

      They are all pre-programmed, you just need to configure the pins as per the shown diagrams.

      Reply
  3. emmanuel says

    June 29, 2021

    I will need the diagram

    Reply
  4. Leo Smit says

    March 15, 2021

    why is pin 13 (D3) grounded and 10,11, 12 not, in the Tx circuit?

    Reply
    • Swagatam says

      March 16, 2021

      Thanks for pointing it out, I have corrected the mistake.

      Reply
      • Leo Smit says

        March 16, 2021

        Thank you for this correction😊

        Reply
        • Swagatam says

          March 16, 2021

          Actually, the previous diagram was correct 🙂
          I just forgot that pin#13 was deliberately grounded, as it would be normally implemented when a switch is used between pin#13 and ground.

          Reply
          • Leo Smit says

            March 16, 2021

            so when pin#13 is grounded and pin#1 is also momentarily grounded via switch , there is output on pin#13 on the Rx and switches on the relay permanently , and will be turned off when pin#1 on Tx is
            grounded again; is this conclusion right? if not, how could this be done in anther way??

            Reply
            • Swagatam says

              March 17, 2021

              A0 to A7 work like compatible ON/OFF switches for switching the Rx load ON/OFf. Pin13 of Tx corresponds to pin13 of the RX, so pin13 of Tx must be connected to ground for enabling the generation the required Rf signal at the pin13 of the Rx.

              Reply
            • Leo Smit says

              March 17, 2021

              CLEAR, THANK YOU SIR!

              Reply
              • Swagatam says

                March 17, 2021

                Glad it helped!

                Reply
  5. Lawal Mohammed says

    March 3, 2021

    Please Sir are the switch momentary type?
    Please I needed your help. I wanted to use the above design to control fan regulator for switching 5 level speeds of a fan.

    Reply
    • Swagatam says

      March 3, 2021

      Lawal, switches are not momentary, and this particular circuit cannot be used for 5 step fan dimming.

      Reply
      • Lawal Mohammed says

        March 3, 2021

        Please Sir could you provide me with a design using rf transmitter and receiver to control 5 level speeds of a fan?

        Reply
        • Swagatam says

          March 4, 2021

          We can perhaps modify the last circuit from the following article. Please build the last design without the IR sensor, and manually confirm the response of the circuit. If it works for you, then we can configure the RF remote with the pin#14 of the IC 4017 accordingly:

          Remote Controlled Ceiling Fan Regulator Circuit

          Reply
  6. Lawal Mohammed says

    March 2, 2021

    Please Sir,does the tx used momentary push button switch?
    How to make it use momentary push button switch to enable sudden change of transmission as in remote control button

    Reply
    • Swagatam says

      March 2, 2021

      Lawal, the switches shown across the address pins are all SPDT switches, they are not push buttons, you can use different combinations of those switches to switch specific sets of receivers and loads

      Reply
  7. NÉLIO ABREU says

    February 13, 2021

    Hi Swag,
    Is there a chip that has more than 8 channels?
    Say, 12, 16, or more?
    best regards.

    Reply
    • Swagatam says

      February 14, 2021

      Hi Nelio, yes, it seems they are available on amazon.

      Reply
  8. ali says

    February 5, 2021

    Hello, how can I control 8 DC motors with it?

    Reply
    • Swagatam says

      February 5, 2021

      You will have to make 8 of the receiver units for controlling 8 motors separately

      Reply
  9. Lawal Mohammed Abubakar says

    November 22, 2020

    Please Sir,will you attach the remaining modules at the output pins 12,11,and 10 of the Same Decoder IC HT12D for controlling 4 appliances,while the remaining 4 appliances control modules being attached to another Same HT 12D output pins 13,12,11 and 10 to complete the total modules for the full 8 appliances ?

    Reply
    • Swagatam says

      November 23, 2020

      It will be identical to the pin13

      Reply
  10. Vinod says

    November 20, 2020

    Dear Swagatahm
    I intend to connect this one circuit diagram to an eight dc motor? If possible how can it be rotated in reverse and forward? As well as how to control its speed? please answer

    Reply
    • Swagatam says

      November 20, 2020

      Dear Vinod, operating 8 motors with speed control and reverse forward cannot be done with this simple design

      Reply
  11. Milan Domadiya says

    October 26, 2020

    Hello Swag,
    Here I am trying to implement this Project with little bit modifications which are I have to use one Tx and Rx. At Tx side when I press 1 switch at that time Rx side 1 relay on and same switch press again it should be off like that I used 4 switch and 4 relay. I have found some questions regarding this article,
    1) May I 4 input switch at Tx side for control 4 relay at RX side?
    2) What are the value of C3 Capacitor?
    3) Can you share some video if you have for this simulation perform. I hope this works fine.

    Reply
    • Swagatam says

      October 26, 2020

      Hello Milan, yes you can use 4 channel Tx, Rx unit.

      C3 can be any capacitor between 1uF/25V an 10uF/25V.

      I do not have any video but as we all know that these Rf modules are highly reliable and will always work.

      Reply
  12. Balcha says

    September 21, 2020

    if two or more inputs are given at the same time the Receiver section will work properly ?
    Thank you!.

    Reply
    • Swagatam says

      September 21, 2020

      No it won’t work properly

      Reply
  13. Abba says

    May 8, 2020

    I want to apply the idea into nurse calling. So that the 8 transmitters will represent the patients, while the single receiver rep. the nurse. I want at the output of the ic 4017 at the receiver to have like 8 set of LEDs which indicates the number of patients. Any suggestion pls?

    Reply
    • Swagatam says

      May 8, 2020

      Just make 8 similar transmitter units, and each one of them will be able to send the signal to the common receiver.

      Reply
      • Abba says

        May 8, 2020

        Thank alot i’ll implement it.

        Reply
      • Abba says

        May 9, 2020

        I understand it.
        So now if i have 8 set of T(x) and a single R(x) both having A1 grounded can respond to each other.
        The idea is can 8 set of transmitters be paired to a single receiver if they have common pin grounded. Am i right? With this i can create 8×8 set of transmitters and 8 set of receivers, the first 8 respond to the first, the second 8 respond to the second receiver upto the last 8set responding to the 8th receiver. 64 transmitters and 8 receivers.
        Secondly, as electronics student is there anyway we can also contribute to this website?

        Reply
        • Swagatam says

          May 10, 2020

          Abba, Yes that sounds ok to me.

          I am sorry, guest posts cannot be published in this website, but you can register in the following highly reputed website and contribute there, and also include my website name in it:

          academia.edu

          Reply
          • Abba says

            May 14, 2020

            Okay, thanks alot your help and advice.
            Regarding the circuit, can it work with antenna, i.e can i cover like 200meter wothout installing antenna on the modules?

            Reply
            • Swagatam says

              May 14, 2020

              yes, the antenna plays an important role, you can use a 3 meter long antenna to boost the range, but 200 meter is not possible with this circuit, 80 meter will be the maximum possible range

              Reply
            • Abba says

              May 14, 2020

              Okay, pls what is the max. Range the RF modules can cover without an antenna? I’m trying to avoid for convience.

              Reply
              • Swagatam says

                May 15, 2020

                Without antenna it may be around 10 meters.

                Reply
  14. Abba says

    May 8, 2020

    Hi Mr. Swag
    I’m thinking weather its possible to reverse the circuit, i.e 8 different set of transmitters and one single receiver, so that the receiver can respond to all the 8 transmitters. I will appreciate if you give me a hint about the new configuration. Thanks for your assistant.

    Reply
    • Swagatam says

      May 8, 2020

      Hi Abba, for that you only have to replicate the transmitters.

      Reply
      • Abba says

        May 8, 2020

        Thanks alot

        Reply
  15. Abba says

    May 7, 2020

    Hi Swag
    Pls is that possible to increase the Rx to 16. I want to control 16 items/appliances, is there room for that? I think about using two 4017 ic, but i think it ll not work. What do you suggest?

    Reply
    • Swagatam says

      May 8, 2020

      Abba, if a 16 channel remote chip is available then you can do it.

      Reply
      • Abba says

        May 8, 2020

        Okay thanks alot.

        Reply
      • Abba says

        May 17, 2020

        Sir the antenna that comes embedded with the rf modules, are they enough to cover the max. Frequency or we need the external antenna, for efficiency?

        Reply
        • Swagatam says

          May 18, 2020

          Abba, the built-in antenna is only a few inches long, which can be increased to 1 meter or more to increase the range significantly, otherwise the range will be quite low. So it must be increased for higher range

          Reply
  16. Saurabh Jain says

    April 10, 2020

    Dear Sir can be used this RF Module for 8 Chanel by using 2 HT12D & 2 HT12E Ic.
    By Switching the -ve Supply in transmitter IC

    Reply
    • Swagatam says

      April 10, 2020

      Dear Saurabh, sorry I don’t remember the specifications of the circuit and the IC as it was written many years ago, so i am unable to answer your question correctly.

      Reply
      • JAIN SAURABH says

        April 11, 2020

        Sir if i send u some circuit diagram than can u help me for solving my problem.

        Please sir….

        Reply
        • Swagatam says

          April 11, 2020

          Saurabh, I normally solve problems related to circuits present in this website, not external websites.

          Reply
  17. Jiro Kato says

    February 29, 2020

    Hey swag, how do I send 8 parallel data at the same time with the HT12e instead of 4

    Reply
    • Swagatam says

      February 29, 2020

      Hey jiro, for sending 8 parallel data you may need 8 separate ICs, and configure their address pins in 8 unique ways.

      Reply
  18. Jeff Shrum says

    October 22, 2019

    Hey Swag
    Love your web sight.
    I want to build a RF module to control four 12v vehicle window motors. They are to control doors in a up and down motion stopping when ever you release the control button. I would also like to incorporate micro switches to stop the motors at the end of door travel.
    Thanks

    Reply
    • Swagatam says

      October 23, 2019

      Thanks Jeff, I think the concept explained below may suit your requirement

      https://www.homemade-circuits.com/simple-gate-openclose-controller-circuit/

      S1, S2 can be replaced with Rx relay contacts, while S3, S4 with limit switches which must be Push-to-OFF type.

      Reply
  19. Jayesh Barad says

    December 7, 2017

    Hello sir
    In transmitter circuit diagram transistor is BC547 but in article you mention BC557. So which transistor we can use.
    Another question how can we figure out that signal is sending or not. Is there possible to know our remote is sending signal or not by some indicator.

    Reply
    • Swagatam says

      December 7, 2017

      Hi Jayesh, it seems like a printing mistake in the diagram, it is actually a BC557. I have corrected it now
      In Tx there’s no way to know whether it is sending signal or not, but in the Rx module the pin#17 LED will oscillate when the Tx button is pressed, confirming the transmission reception

      Reply
  20. Jayesh Barad says

    November 30, 2017

    Sir i have one doubt what should we connect to ANT pin in both RSW434and RSW434.

    Reply
    • Swagatam says

      November 30, 2017

      You can connect a long flexible wire as the antenna, use around a meter long wire for best response

      Reply
  21. Jayesh Barad says

    November 15, 2017

    Hello Swagatam sir,
    I have a doubt. In transmitter unit diagram pin no 13 i.e., D3 is connected to R4 as well as ground. Is this correct or we need to connect D3 pin to just resistor R4 only

    Reply
    • Swagatam says

      November 15, 2017

      Hello Jayesh, yes that’s correct, because one of those pins needs to be joined to ground for initiating the signal from the transmitter, along with the selected Address pin switch, otherwise we may have to press two switches simultaneously to initiate the transmitter, which could be difficult..

      Reply
  22. Tesla says

    January 26, 2017

    Hi Swagatam…
    Do have an article here that discusses about making an RF Rx & Tx? Any frequency can do..

    That would be a great help..thanks

    Reply
    • Swagatam says

      January 26, 2017

      Hi Tesla, you can refer to the following article

      https://www.homemade-circuits.com/2013/07/simple-100-meter-rf-module-remote.html

      Reply
  23. NvD says

    November 24, 2016

    sir ,
    is it possible to build and post 8 relay circuit

    Reply
    • Swagatam says

      November 24, 2016

      NVD, you can get it from some other online website….just search for "8 channel RF remote control circuit"

      Reply
  24. NvD says

    November 23, 2016

    sir,
    i dont want 8 individual reciever circuit.i want all the 8 relays to be on the same reciever circuit.sir please provide me a circuit diagram for this.i want the first relay to operate when i press the first remote button,second relay when i press the 2nd button so on…

    Reply
    • Swagatam says

      November 23, 2016

      NVD, if you want 8 relays on one receiver, then you can simply buy an 8 channel RF remote module or build the same at home

      Reply
    • NvD says

      November 23, 2016

      sir
      can you please provide me a circuit for the above purpose
      controlling 8 applications with 8 relays placed in same reciver circuit

      Reply
    • Swagatam says

      November 24, 2016

      presently I don't have an 8 relay circuit, I have a 4 relay circuit though

      Reply
  25. NvD says

    November 23, 2016

    sir,
    could u please how can i use this circuit for controlling 8 devices.can you please explain in detail.also tell me where a1 a2 etc and d2 etc should be connected for controlling 8 devices.if possible provide me a circuit diagram for controlling 8 devices.please sir.is there any pcb available for this project.
    thank you

    Reply
  26. Success Ola says

    August 16, 2016

    Sir,
    I would like to know like to know how to use a PIC16F630 as an encoder and decoder to build an eight(8) channel remote control.

    Pls sir, I would need a detail explanation on how to build it, because am a little new to circuit building.

    Thank you.

    Reply
    • Swagatam says

      August 16, 2016

      Success, sorry I do not have much idea about this…so can't suggest

      Reply
  27. Kannaa Ramesh says

    July 19, 2016

    Sir I succeed with pairing 433 with 9 channel using ic 74hc147 to data in 12e & ic 74ls145 out bcd to decimal for 12d, my quest is i need IR transmission, i tried several methods 38 khz 555, 74132, 40khz crystal 4093, 7400 no use, result 0, pls help me to transmit ir data without using audrino

    Reply
    • Swagatam says

      July 19, 2016

      Ramesh, I would be difficult for me to troubleshoot an external circuit, I can help only with those circuits which are published in this website

      Reply
  28. vennilavu says

    July 18, 2016

    Sir pls help…how it modify for 8 out put or relay circuite

    Reply
    • Swagatam says

      July 18, 2016

      You need to make the first circuit 8 times for the 8 appliances individually and use the second circuit for controlling them through the indicated 8 switches

      Reply
  29. orrie says

    June 27, 2016

    hello sir.this is a good circuit.without muc. i have 1Q. HT12D have 4no. output then how can i toggel 8 relay.if i make 8 relay driver stage then wher i conect it.ht12d ic have 4 output.

    Reply
    • Swagatam says

      June 27, 2016

      orrie, the above RF modules are also 4 channel type, so you can follow and build the above design exactly as it is shown, for your application.

      Reply

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