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Make this IR Remote Control Range Extender Circuit

Last Updated on by 57 Comments

In this post I have explained how to increase or extend the range of an ordinary infra red or IR remote control through a 433MHz RF remote control system.

IR Range Extender Concept

The idea of this circuit is to feed the IR data from an IR transmitter into the transmitter input of an RF module through an IR sensor, and transmit the data in air so that the distant RF receiver module is able to receive the data.

After receiving the data the RX would decode it and convert it back to IR based data, which could be used for triggering the relevant  IR operated distant device.

Block Diagram

TSOp block

Parts You will Need to Build this Circuit

Transmitter Stage

433MHz or 315 MHz RF Encoder Modules, as shown in the following article, and assemble them as show:

How to wire RF Module circuits

All below shown Resistors are 1/4 wat t 5% CFR, unless otherwise specified

1M - 1no, 1 K - 4nos, 100ohms = 2nos,

Transistor BC557 = 1no

Capacitor 10uF/25V = 1no

Receiver Stage

433MHz or 315 MHz RF Decoder Modules, as shown in the above linked article, and to be assembled as show:

1K = 1no, 10K = 1no, 330ohms = 2nos, 33K = 1no

IR photodiode (any type) = 1no

Transistor = BC557

RED LED = 2nos

Capacitor -= 0.01uF

The IR to RF Range Extender Transmitter Circuit

extended transmitter

The figure above shows the basic layout for the infrared remote control range extender transmitter circuit, wherein a 433MHz or a 315MHz RF encoder circuit can be seen built around the chips HT12E and TSW434, and we can also see an attached simple IR sensor circuit stage using TSOP730.

The IR sensor can be visualized at the extreme right side of the diagram with pinouts: Vs, Gnd, and O/p. The output pin is connected with the base of an PNP transistor, whose collector is integrated with one of the 4 input pinouts of the RF encoder IC HT12E.

Now, to enable transmitting of the IR data to a distant location to extend its range, the user has to point the IR rays on the sensor from a IR handset and press the relevant button of the IR handset remote.

As soon as the IR rays hit the TSOP sensor, it converts the data into its respective PWM format and feeds the same to the selected input pinouts of the HT12E encoder.

The encoder IC picks up the converter IR signals, encodes the data and forwards it to the adjoining TSW434 transmitter chip for allowing the transmission of the data into the air.

The signals travels through air until it finds the antenna of the corresponding RF decoder module using 433MHz or 315MHz as the operating frequency.

The Range Extender RF Decoder Receiver Circuit

IR extender receiver circuit

The circuit diagram shown above represents the IR data receiver circuit which receives the transmitted signal from the transmitter end and reverts the signals back to the IR mode for operating the IR device extended at this remote end.

Here the RF decoder module is built using HT12D IC and the receiver using RSW434 chip. The receiver chip picks up the transmitted IR to RF converted data, and sends it to the decoder IC, which completes the process by decoding the RF signals back to IR frequency.

This IR frequency is appropriately fed to an IR photo-diode driver circuit built using a PNP transistor and an IR photo-diode device, as shown at the extreme right side of the circuit.

The decoded RF to IR frequency is oscillated and transmitted by the photo-diode and applied on the device which is to be operated at the remote end.

The device hopefully responds to these RF decoded IR signals and functions as per the expected specification.

This concludes the IR range extender circuit using RF 433MHz modules, if you think I have missed something in the design or in the explanation please feel free to point them out through the comment box below.

Another IR Remote Control Extender Circuit using Rx, Tx Modules

This schematic was graciously contributed by Mr. K. Ayyappan to benefit all the interested readers. We sincerely appreciate his valuable contribution.

SimpleTX RX Final

Circuit Description

In this always on circuit the demodulated signal out of IR receiver is fed directly to the transmitter module TX02. At the receiver RX02S side, the on-air received signal is modulated with CD4093 marked IC1. IR LED driver can be an NPN(Emitter Follower configuration) or a PNP as shown. The resistor in series with IR LED controls the IR range.

This may be one of the simplest IR extenders with minimal component footprint. The Tx and Rx home made boards as per given schematic using a Veroboard KS 110, cut as required, have been tested for over a year. No performance reduction, components failure or spurious operations have been observed despite some issues as described below:

The IR LED remains on with lesser intensity when no signal is received. This is observed to be due to

1. The ASK Receiver is prone to noise pick-up from various sources like a passing motorbike's engine, fan or any other motor, TL, etc.

2. The free running modulator IC1 using CD4093 cannot be turned off when not required without increasing the complexity of the circuit via pin 6 of IC1 segment marked IC1 - B as an "enable" signal.

Other considerations:

1. T1 base current may be reduced using a higher value R1 to reduce IR LED no-signal intensity though it may not be possible to eliminate it totally.

2. Resistor R2 at IR LED driver T1 is not required at all and can be dispensed with.It does not serve the intended purpose due to factors listed above.

3. Components used were lying around in stock except for Tx/Rx modules. No calculations were done to arrive at values shown or selection.

Though the Rx module from DIGIMORE has a 434MHz oscillator, modules from other vendors having other oscillators do work. For e.g. an Rx module with 6.7458MHz crystal has been tested to be working properly.

Special mention: Thanks to Nuts & Volts Magazine for the modulator frequency calculation.

Reader Interactions

Comments

  1. Tried HT12E/D circuit as given here though I had my reservations about them as mentioned earlier. It did not work.
    I just used an LED at D0 of both encoder and decoder ends to see if they mimic each other. The demodulated output from IR receiver is fed directly to D0 of encoder and also after inverting using a NAND gate. The LED at HT12E blinks with slightly lower intensity on direct connection and brightly when used with a NAND gate as expected. But at HT12D decoder end the LED either remains on or off – static. And at times the LED at decoder end comes on on power up and stays so. Both HT12E/D operated on 9V battery via a 7805 regulator with appropriate filtering.

    Reply

  2. Hi,

    Thank you for posting my schema. However please note that for an NPN driver, the C should at high side and E at R/LED side. This may sound obvious but for a newcomer this is essential. NPN tried was 2N2222A.

    Reply

    • Thank you sincerely for your valuable efforts to enhance this design. I hope the readers will find the information helpful and take it into account as they proceed.
      Additionally I have updated the circuit description based on the suggestions you shared in your email.

      Reply

  3. Hi, greetings. The IR extender as described here seems interesting. Has this been tested to be working? I have been using a simpler IR extender without HT12E/D for over a year now. I can mail the schematic if desired. But it has one glitch – the IR LED at receiver end remains pulsing thanks to the RF receiver picking all and sundry noise from other sources. With the receiver side remaining on 24Hrs all these days, I was expecting the IR LED performance to reduce or IR LED to perish but luckily it is still working. If the designs as given here using HT12E/D works it would do a lot of good perhaps to keep IR off when no addressed transmission is present. Using the not so easily available HT12A instead of HT12E would be an option but not tried so far. And I am not sure if HT12E is capable of handling pulsed inputs. Please let me know. Thank you.

    Additional info: The IR Tx/Rx boards made on perforated project boards(6 x 3.5 cms) are encased in HDMI extender boxes which may contribute additional noise. Though the HDMI extender boxes have built in IR they did not support RC5/6 protocols.

    Reply

    • Hi, the circuit is not yet tested by me….if you are using a photo diode or an IR LED, it can be enclosed inside an opaque tubing, open at the ends, then it can be blocked from spurious light sources and triggered only through legitimate IR sources.
      HT12E can probably handle pulsed inputs if the frequency is in kHz.
      You can send me the schematic at my email
      homemadecircuits
      @gmail.com

      Reply

      • Hi, thank you for your prompt reply. I have already tried HT12E/D but with different values for HT12E/D oscillators but no go. I used readily availble Tx/Rx boards with HT12E/D and made changes accordingly. Please see the mail for the schematic of the one that I use.

        The Rx side noise is due to ASK Rx picking up external noise probably due to built in AGC. I could verify this with Tx off and use a non-infra LED and an R at data out of Rx. I will try HT12E/D combo avoiding the pre-fab boards and revert.

        Reply

        • Thank you very much for your kind feedback, and for sending me the schematic; I have successfully received it. I have included it in the article above to ensure that other readers can benefit from your contribution. Your generosity is greatly appreciated!

          Reply

        • I’m not convinced that HT12E/D are capable of handling IR as described in IR extender here. For e.g. RC5 has 14 bits and takes approx 25ms per frame. With 8 address bits 4 data bits how the 14 bits are expected to be sent to transmitter module is a big question. Besides HT12D is a latch type. They are suitable for one of two states ops only.
          These E/D have been existing for years now but not one article mentions about its use in IR control of devices that has more than 4 ops and that too not an On/Off static state given that so many brilliant heads out in the world. So there’s nothing to revert with for use as an IR extender by me.

          Reply

  4. Dear
    i have seen one IR Remote Control in which IR led give too long range up to 50 to 60 feet with good degree.
    i test many IR led like Osram, Everlight ,Merubeni & some other chinise also with same Remote but i am still less satiny. There is one golden filament type net on waffer shown inside it.
    Some one say if we use Laser IR then it will possible.
    Kindy suggest me what technology used inside for increase range of IR led ?

    Reply

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