Remote Control Circuit Through RF Without Microcontroller

Nidheej January 3, 2011 75 Comments

Remote Control Circuit Through Radio Frequency Without Microcontroller

Description

This is a simple type remote control by using RF communication without microcontroller. In this project a remote has been designed for various home appliances like television, fan, lights, etc. It gives lot of comfort to the user since we can operate it by staying at one place. We can control any of the appliances by using this remote within the range of 400 foots. In this project consist of two sections, transmitter (remote) and receiver section. Whenever we are pressing any key in the remote it generates the corresponding RF signals, and these signals are received by the receiver unit. ASK transmitter and receiver is used as transmitter and receiver. HT12E, HT12D encoders and decoders are used in this electronic circuit. The block digram of the whole circuit is given below.

Appliance Control Block Diagram

Appliance Control Block Diagram

Remote Section

In remote section consist of an encoder (HT 12E) and a ASK transmitter. The encoder generates 8 bit address and 4bit data. We can set the address by using the DIP switch connected in A0 to A7 (pin 1 to 8 ) encoder. If we set an address in the remote section, the same address will be required in the receiver section. So always set same address in transmitter and receiver. Whenever we press any key in the remote the encoder generates corresponding 4bit data and send this data with 8bit address by using ASK transmitter. The transmitting frequency is 433MHz. The transmitter output is up to 8mW at 433.92MHz with a range of approximately 400 foot (open area) outdoors.  Indoors, the range is approximately 200 foot.

Remote or Transmitter Circuit

Remote or Transmitter Circuit

Receiver Section

At the receiver section ASK receiver is present. The receiver also operates at 433.92MHz, and has a sensitivity of 3uV.  The ASK receiver operates from 4.5 to 5.5 volts-DC, and has both linear and digital outputs. It receives the datas from the transmitter. Then the decoder (HT 12D) decodes the date and it will enable the corresponding output pin (pin 10,11,12,13). Each output pins are connected to separate flip flops. The output of encoder will change the state of the flip flop. So its output goes to set (high) from reset (low) state. This change makes a high signal in the output of the flip flop. This output signal is not capable to drive a relay directly. So we are using current driver, SL100 transistor act as the current driver. The appliance is connected to 230V AC through the relay and the appliance will start. The relay will be re-energized when the same switch is pressed in the remote. This is because we are pressing the same switch in the remote control. The output of the decoder again goes to high so this signal will again change the state of the flip flop. So, the relay gets re-energized and the appliance goes to OFF state.

Remote Control Receiver Circuit

Remote Control Receiver Circuit

Components Used

IC HT 12D 1
CD 4017 4
LM 7805 2
TRANSISTOR BC 558 4
SL 100 4
RESISTOR 180 K 4
1 K 4
560 E 4
39K 1
1M 1
CAPACITOR 100nF 4
100MFD/16V 4
LED RED 4
DIP SWITCH 2
PUSH TO ON SWITCH 4
ASK TRANSMITER 433MHZ 1
ASK RECEIVER 433MHZ 1
Comments
  • kandasamy
    August 6, 2016

    i want to control my machine with individual remote by RF method .what will be the cost of remote and receiver unit.approximately 12 nos required.

  • ASHIK NAIK
    June 7, 2016

    nice.
    But what shall i do to operate some small motor or other equipment momentary.I.E. it should operate while the remote button is kept pressed.Once we release the remote push button the o/p stops.
    Can you please guide me?

  • Sree
    February 10, 2016

    Does this cd40174 need a clock signal?

  • subhan
    December 19, 2015

    Please…
    Give me suggestions
    I made this project…it works well
    But problem is..WHENEVER I POWER ON the circuit….4 channels…on and off immediately.. after few seconds it working well…
    But if I remove the remote battery the circuit relays continuously ON.. Until connect the battery to remote..

    Please say where is problem??

  • vismaya k.d
    March 12, 2015

    can i simulate this circuit in proteus

  • vismaya k.d
    March 12, 2015

    which software is used to simulate this remote control circuit through RF without microcontroller.

  • Nayan Sharma
    March 10, 2015

    Can we use ULN2003 relay driver chip to drive the relay instead of the flip flop current driver circuit?
    Thanks!

    • Mdmotiur
      June 6, 2015

      Hi Nayan ,yes you can ,but remember at the receiver section ASK receiver is present. The receiver also operates at 433.92MHz, and has a sensitivity of 3uV. The ASK receiver operates from 4.5 to 5.5 volts-DC, and has both linear and digital outputs. It receives the datas from the transmitter. Then the decoder (HT 12D) decodes the date and it will enable the corresponding output pin (pin 10,11,12,13). Each output pins are connected to separate flip flops. The output of encoder will change the state of the flip flop. So its output goes to set (high) from reset (low) state. This change makes a high signal in the output of the flip flop. This output signal is not capable to drive a relay directly. So we are using current driver, SL100 transistor act as the current driver. The appliance is connected to 230V AC through the relay and the appliance will start. The relay will be re-energized when the same switch is pressed in the remote. This is because we are pressing the same switch in the remote control. The output of the decoder again goes to high so this signal will again change the state of the flip flop. So, the relay gets re-energized and the appliance goes to OFF state.

  • Jeff
    February 4, 2015

    Dear Author,

    I was wondering if I could get a part number for the relay. I’m wondering if I am using the wrong type of relay. When I connect I get a constant buzzing and it is always closed, thus leaving my light bulb on. Please and thank you.

    • manas
      March 22, 2017

      Hello…we are doing project on rf remote control…. we have made the circuit as per the figure given above… but the problem is that the relay and led actuates directly when the main power source is on without the use of push to on switch of the transmitter…connection are all right as per the diagram given in the site..except using 12v battery we use 12v rectifier output in the receiver section…..please do reply

  • susantha
    January 18, 2015

    62 responses to remote control circuit through rf without microcontroller

  • sutar sarfaraz
    January 15, 2015

    What is the value of c3,c5,c7 and c9 capacitor

  • akshay
    December 21, 2014

    if we press two on off butten at a time will it works???

    • susantha
      January 18, 2015

      cd4017 circuits

  • fahad
    October 19, 2014

    dear sir, there is some confusion for me.
    in the receiver section the ICs (U3, U4, U5 & U6) mentioned as CD40714B.
    but, in the component list it is mentioned as CD4017.
    please guide me, which one is right for this circuit.
    the datasheet of CD4017 differs from CD40714B.

    • dileep
      December 20, 2014

      do we require any code for dc motor control by using rf wireless communication …???

  • Harjeet
    October 5, 2014

    hey can i use 9 v battery for receiver circuit..,, and also can i use this sme circuit for making rc robot

  • Rohit
    August 30, 2014

    Hi!. This CD 4017 IC seems to be a decade counter IC. However, CD 4027 is JK Flip Flop. Kindly confirm the use of CD 4017 IC.

  • Macheda
    August 12, 2014

    Is it okay if i can remove the Flip flop and use the current driver?,connected to relay and then interfacing it with the Appliances.

    What type of relay is the one shown in the above diagram?

    thanks

  • Rafael
    June 21, 2014

    Searching more I found this http://maxembedded.com/2011/09/06/rf-module-interfacing-without-microcontrollers/ what could be similar. But I do not have a way to get them in Dominican Republic. If there are substitutes I would like to know which ones. Basically we use quick reference like ECG and NTE. If any body can help me to have them let me know reference and place to pay for them, not problem it be in US.

  • Mani k
    June 18, 2014

    I want the basic robot making ideas and
    related circuit

  • Anoop Sree
    April 15, 2014

    i want bluetooth headset circut

  • Prakash
    April 12, 2014

    i have done this. its working properly. you can use following equivalent components as
    CD4017 = HCF4017
    SL100 = CL100

    • fahad
      October 19, 2014

      hi prakash, there is some confusion for me.
      in the receiver section the ICs (U3, U4, U5 & U6) mentioned as CD40714B.
      but, in the component list it is mentioned as CD4017.
      please guide me, which one is right for this circuit.
      the datasheet of CD4017 differs from CD40714B.

  • sai
    April 11, 2014

    what does the load connected to relay mean here?

  • NITIN
    April 7, 2014

    Hi, this site and circuits are very usefull. For remote circuits can i use existing IR remote just like CTV/DVD/AC remote to control various electrical equipments instead of creating another new remote. If it is possible please tell me in detail.

    • Seetharaman
      April 7, 2014

      No Nitin this is custom made.

  • Vkanth
    June 4, 2013

    Why wasn’t my previous reply posted? I took good effort in putting the questions together!

  • Vijay
    May 29, 2013

    Hello,

    I built this circuit, but it doesn’t seem to work. I’ve assembled the components on two separate breadboard one for each side, and since i dont have an oscilloscope, I’ve tried the following diagnostics so far:

    1. Checked and confirmed that all connections and component values are as per he circuit above.
    2. Can confirm that when any dip switch is pressed then then the voltage at pin 17 on the encoder goes high. That seems to indicate that it’s trying to send something to the ASK transmitter.
    3. I dont know of a way to check the transmitter and if indeed its sending something out. I’ve checked that its receiving exactly 5volts as per the rest of the circuit.
    4 on the receiving side, the voltages at pin 18 and the ASK receiver is measured at 5v exactly. The output pins 10 thru 13 show a -0.00 (?) on my multimeter. Pressing the switches don’t change any voltages here.
    5. I have also replaced all components except the ASK components to confirm its not some defective part, but still no luck. I’ve checked youtube and loads of people have had success with this circuit apparently. One guy replaced the 39K resistor with a 51K one to make it work for him. I tried and still hasn’t worked.

    Note: I have not built the relay driving circuit but instead using bc558 transistors to drive an led each for each output to prove the concern works. If it does then I shall put the rest together.

    After 2 days I’ve kind of given up. My final suspicion is on the ASK components which I’ve ordered again. Any suggestion on what else i could investigate would be appreciated. Thanks for reading my post.

    • avijeet
      December 19, 2013

      Hello vijay,
      I had made this and is working fine.
      For step wise testing purpose first remove rf tx and rx from circuit and connect data out pin of ht12e with din pin of ht12d.all 8 address pin should be in same positions in both circuit.u can sort all this 8pins together with ground directly without using dip switch(I have done this).in normal condition when both circuit is powered up the vt pin and all four output on receiver side will show u high.I.e 5 volt.u can attach five 5mm led on this output and vt pin for testing.on pressing any push buttun on tx side the related pin in rx side will go low I.e 0 volt and u will see led at vt pin flicker with every push.

      Thanks

      • Sanjay Sharma
        September 23, 2014

        Dear Sir,

        Can you tell me about how to pairing of the rf and tx.

      • fahad
        October 19, 2014

        which component u had used as U3, U4, U5 & U6 in the the receiver section.
        pls tell me accurate No.

  • panos
    April 28, 2013

    560E is 560 ohm??

    • Prakash
      April 12, 2014

      yes

  • panos
    April 27, 2013

    whith which one can i replace the sl 100 tranzistor??bc547 is correct?this circuit is working properly but the relay which is 6 volt mine dont work…but the led flashes..it is wrong the 6volt relay or the bc547 with replace sl100??

  • christian dalli
    April 7, 2013

    what is the lowest input voltage and the lowest output the second diagram gives

  • christian dalli
    April 6, 2013

    hallo
    i just want to know about how big both circuits are?
    thanks

    christian dalli

  • NEERAJ PANT
    March 16, 2013

    here what is the use of 4017 ic….

  • Tenzin Karma
    February 23, 2013

    De-Energized, not Re-energized…. that was the only part that got me confused, apart from that, all i can say is that this is exactly what i have been looking for for the past 2 days, in vain… and now that i found this circuit, well. i am so happy that i want to give you a chocolate 😀

  • January 15, 2013

    in this project only used ASK why not use the other technique

    • Anish
      January 19, 2013

      Simple, because it is simple and easily available, low cost and easy to use.

    • Jitendra mattlia
      January 30, 2013

      U can also use IR LED as medium. U have to use 555 ic for genrating 38khz. I build this and working fine for so many years. U can also get circuit using IR remote for 230V ac appliances control. Remote used is a philips tv remote. This required microcontroler. Working fine.

      • anurag
        July 18, 2013

        can you send me circuit diagram of that circuit

  • Imam Hasan
    December 27, 2012

    can any one help me how to genarate 8bit data
    in reciver section and tranmitter section
    i made it but not working
    please help me
    give reply to”hasan08eee@gmail.com”

  • Sheldon Livingston
    November 3, 2012

    Two questions, if I may:

    What are you using for an antenna (small?)?

    A 12 bit encoder = 4,096 combinations. Are aware of a 32 bit encoder?

    Thank you for the info!

  • Francis
    October 20, 2012

    its awesome it works perfectly thank u…….. and congrats who built it.

  • akhil
    August 25, 2012

    the circuit is looking very complex can i see a simple circuit for the development of this as a project

  • bhavin
    August 14, 2012

    plz give me full data for tranmitier and reciever……..

  • Louie
    August 12, 2012

    Hi,

    Can anyone tell me how to add more security for this circuit more than just the dip switch… I’d like to apply this on our house to automate the parking gate so, I want to make it more secured. And also please indicate other alternatives for the IC’s(HT12E and HT12D) included in the circuit if possible.

    Any help would be much appreciated.. 🙂
    Thanks in advance!

  • aswin
    June 17, 2012

    how much it cost ?am from kerala

  • May 30, 2012

    Can somebody hlp me i am frm nigeria the worst country ever i cant even get a 555 timer ic nd i want 2 build an rf remote control circute heeelp!! me pls (umufirdauz67@yahoo.com)

    • Raphael blessing
      January 30, 2013

      Guy u beta, wake up bcs am a nigerian 2, but i av mor dan enough common 555timer chip dat is every electronics shop. Moreover if u tink 9ja is worst goto iraq, mali, egypt etc.

  • Tittu
    March 4, 2012

    Good work,…..suitable for doing Mini projects

  • Tittu
    February 28, 2012

    Hi GP Koruthu

    I am too from kerala,
    kollam

    we made this project success.

    Its pretty easy to find all the components in earnakulam

    • Vinita
      September 9, 2012

      Hey,
      I’m trying to implement the circuit for a small exhibition in my college. Could you help me understand the design aspects of the circiut?

  • Tittu
    February 28, 2012

    Hi Arun,

    As i mentioned in previous comment,

    its easier to make an 8 bit data, just keep an address using Dip switch as same as trnsmtter and recvr

    while switching the 8 bit adress together with data will transmitted

  • Tittu
    February 28, 2012

    Hi anil,

    Its pretty simple to generate 8 bit data, using this circuit…

    First of all you have to do with,,….

    Use same Dip address for both transmitter and receiver……

    And check for the output…

    If still nothing happenned you have to do is remove the rf module completely (both trnsmtr and rcvr) .
    And connect the Din line of encoder to Dout pin of decoder

  • anil
    February 12, 2012

    hi,
    can any one help me how to genarate 8bit data
    in reciver section and tranmitter section
    i made it but not working
    please help me
    give reply to”anila35@rocketmail.com”

  • anil
    February 12, 2012

    hi,
    can any one help me how to genarate 8bit data
    in reciver section and tranmitter section
    i made it but not working
    please help me

  • Mahendran
    January 17, 2012

    Hi, I have make night sensor

  • pradeep
    November 21, 2011

    Can you kindly inform that can i get these IC HD12 and the ASK transmitter and receiver in sri lanka and what is price in doller

  • Jazzy Maistry
    October 23, 2011

    Hi everyone, I Need help. I want to make a disco light that works on 220v power, to work of a remote, please can somebody help me, I found a remote and transmiter but it works on 12V power please help.
    jazzymaistry@gmail.com

  • seetharaman
    July 30, 2011

    Hi Avinash please go through Philips datasheet.
    http://www.nxp.com/documents/data_sheet/UAA3220TS.pdf

  • avr avinash
    July 30, 2011

    hi friends,
    can any one tell me how to get the ask transmiter and receiver. is there any name of that ask transmiter and receiver like a IC have some name

    • christian dalli
      April 6, 2013

      hallo avr avinash
      you con get them from ebay

  • G P Koruthu
    April 9, 2011

    Dear M/s Jojo & Vikas Sharma,
    I am not in Delhi. I am in the southern end,Kottayam,in Kerala.Here electronic shops are rare. May be I can find some of these special items in Cochin or so. Any way it’s a hobbey for me after retirement just out of interest.

  • NILESH SHILANKAR
    February 15, 2011

    it was one of the good mini project,which help me in B.E. 6th semester.
    thanks for the one who design it…

  • vikas sharma
    February 8, 2011

    hello buddy does anyone can told me that i made this but not working may be my receving part is not working and i dont know why can any one tell me how can i give the vt in the ht12d i give it through 2222 transistor does it wright?

    and mr.g p u will get these ic in lajpat ray market is u are in delhi

  • February 6, 2011

    How we set the 8bitaddress.plz help me

  • R KANNAN
    February 2, 2011

    how to increase the range of more than 400 foots and also how to increase the MHz frequency. Is any design procedure is for that. pls provide me…

  • infant
    January 14, 2011

    sr..anybody plzz say the circuitdiagram for wii remote whchich is used for video games(tennis) for my project plzz help mee

  • jojo
    January 5, 2011

    Hello Koruth,

    I think you can get it near your local electronics store.

  • G P Koruthu
    January 4, 2011

    Can you kindly inform as to where we can get these IC HD12 and the ASK transmitter and receiver.

    • Aneesh P
      August 1, 2012

      Ya,its a nice one……

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