IR sensors available in market are quite costly ranging from 10$ to 100$ obviously they are also excellent in efficiency but in engineering cost efficiency also plays an important role so today we are gonna have a look at circuit diagram of IR sensor using 555 timer which will cost you just $2. The main function of this remote control switch is to control any load like TV, Fan, Radio, light, etc. The infrared remote control switch is divided into two sections: transmitter section and receiver section. The three projects all depend on the IR LED and Photodiode. It generates the continuous pulses of the frequency. The circuit works by pressing any key on the remote. Transmitting Section 2. This project explains the principle of IR communication. The required components of this circuit mainly includes NE555IC, resistors R1 & R2 = 10k & 560, D1 (IR photodiode), D2 (IR LED), C1 Capacitor (100nF), S1 (push switch), B1 (Buzzer) & 6v DC Supply. Infra Red Switch: Infrared / Ultrasonic Beacon: Infrared Active Motion Detector: An ambient-light-ignoring infrared active motion detector Infrared Alarm: This circuits consist of two parts, the first part will transmit a signal, and the second part will detect that signal and trigger a relay. 5v power supply (USB is fine), Breadboard, jumper wires. This is an IR transmitting circuit which can be used in many projects (I designed this to try to make my 3D glasses wireless). First, you may test them on a breadboard. It also operated manually by pressing switch S1 to ‘on’ state. The IR beam in the transmitter section produced by the infrared LEDs is directed to the receiver section. About: I am a electronics engineer as well as a hobbyist is many other areas. … It has one input and output which only acts on the base of the input IR signal. Infrared IR Switches Circuits & Projects (5) Browse through a total of 5 Infrared IR Switches Circuits & Projects. Circuit Description of infrared (IR) remote control switch As in all wireless systems Infrared (IR) remote control switch also comprise two major section i.e. IR is a complex piece of technology yet very simple to work with. The first example circuit uses a TSOP382 IR photo sensor to receive and demodulate the IR signal from a common remote control. Here the IC1 is wired as a short duration monostable timer using R3 and C1 as timing components. One needs to have a more complicated circuit for that. Here the IC1 is wired as a short duration monostable timer using R3 and C1 as timing components. Traffic Light Control Circuit (74145): Train Detector with Infrared LED: A moderately complex train detector using an infrared LED and detector Train Electrical system 1: H0 and N . If this does not happen, check you have put the photodiode in correctly, check your wire connections, check your power source, if none of this help, the problem might have occurred between the IR LED and the photodiode (you should buy new ones or try a different pair). For example, you can use it to control the room lighting in your home theater setup using any of the remotes you already have. When an appliance is connected to it, the relay turns on or off and the LED stops the reverse voltage, otherwise it may affect the counter. IR Switch Circuit diagram Here is a Simple Infrared controlled Switch. transmitter and receiver section. By using a transistor, we can turn dirty analogue from the photodiode into clean analogue which the output LED likes better. And the signal gets connected to digital pin 2. Resistor: 3x 220ohm, 2x 10k, 2x 1M, 2x 3M, Diode: 2x IR LED, 2x Photodiode, 1x generic LED, 5v power supply (USB is fine), Breadboard, jumper wires. The infrared rays emitted by the IR Transmitter i.e. Transmitter circuit information . transmitter and receiver section. Connect this circuit to any of the home appliances like TV, radio, lamp, fan etc, to make their switching on and off options simpler. FAST & FREE. IR (Infrared) Remote Control Switch Circuit is a cost-effective solution for home appliances in our fast-paced life. With the given values, output of IC1 remains low for three minutes. The main components of this IR remote control switch are CA 3130 operational amplifier and 4018 counter. What are Ferromagnetic Materials – Types & Their Applications. The output of the op-amp is given to the pin-14 CLK of the counter 4018, and by applying clock pulses to the 4018 IC, the output goes high. (This is a very common remote handset frequency). thank you ! The emitter is an IR LED and the detector is an IR photodiode. To adjust the circuit, hold down S1 while pointing LED1 at the receiver. IR Switch Circuit diagram. The Infrared remote control-basics operation and applications are explained below. By using this Circuit, we can increase the range of emitted IR radiation up to 100cm. The circuit is very simple, all it needs is: Resistor: 2x 220ohm (or similar), 1x 10k. Once the circuit is complete, test the sensor by hovering an object or your finger about 5cm above the two diodes, then slowly move the object/finger towards the diodes till you touch them both. The circuit looks for any modulated IR source and uses it to control a TRIAC, which then switches any appliance connected to it's socket. TheNE555 timer is configured in a stable mode, and in infrared LEDs, the IR rays are directed by the source of power, which is from 9V battery and concave lens. If the 555 timer is switched on, the output of the pin3 becomes high and this activates the transistor SK 100. This is IR appliance switch circuit using any infra-red remote control. There is a long list of sensorsthat are available in market today. The IR receiver then demodulates the IR light signal and converts it back to binary before passing on the information to a microcontroller: The modulated IR signal is a series of IR light pulses switched on and off at a high frequency known as the carrier frequency. Output Pin 3 of the 555 Timer IC has been connected to IR LED using 470 resistor and a push button switch. It is very useful in controlling any house hold appliance with the help of remote. If the transistor is switched on, the IR diodes produce a high-intensity infrared beam which is given to the photo diodes of the receiver. Unlike LEDs or LASERs, Infrared cannot be seen with the human eye. The connections for +V and -V are incorrect. Photodiode D1 senses the IR signal and feeds it into 30kHz tuned circuit L1-C1-C2, which is lightly damped by R1. It can be used to switch on the lamp in the TV room CD4538-Datasheet The circuit uses the popular IR sensor module TSOP 1738 and the precision … Share it with us! An IR sensor can measure the heat of an object as well as detects the motion.These types of sensors measures only infrared radiation, rather than emitting it that is called as a passive IR sensor. The CA 3130 op-amp is a BiCMOS operational amplifier, and it has a high-input impedance, a low-input current and a high-speed performance. This is the very simple circuit diagram of the IR remote control switch. The basic purpose of TSOP1738 is to convert the IR signal to electric signals. With this circuit, you can put them back into use. We can do this project With the following – Can be used with almost any infrared remote. IR Remote Controls Switch Circuit. The generic LED should light up more the closer you get, this is because the object is reflecting more infrared into the photodiode. These remote controls use infrared light and photo receptors and different light frequencies for different functions. In this remote controlled switch circuit we are using TV remote to ON/OFF the AC light by pressing any button of remote, and using the TSOP1738 at receiver end. Circuit : Andy Collinson Email : Description: This is a single channel (on / off) universal switch that may be used with any Infra Red remote control using 36-38kHz. A: No the article covers very first level remote control switch. TSOP1738 is an IR receiver with an amplifier that acts as a switch and converter within a circuit. 1,106 sold. Receiving Section. These remotes can control several appliances, equipments and gadgets like, radios, TVs, video games, CD/ DVD players, and also applicable in Space(NASA). The output will stay on even after you have taken your object away from the sensor, the output will only shut off if you hover an object over the other sensor, it will then stay off until you repeat this process. Here we have used multiple IR LEDs to increase the distance. The output of the mono toggles the J-K flip flop, whose Q output drives the relay through SL100 npn transistor (T1). Circuit Description of infrared (IR) remote control switch As in all wireless systems Infrared (IR) remote control switch also comprise two major section i.e. It is very useful in controlling any house hold appliance with the help of remote. One of the most frequent is that which makes use of IR radiations at particular frequencies for operations. The IR receiver module operates at this frequency. The home appliance to be controlled is connected between the neutral terminal of the mains and the pole of the relay. The Q1(PNP transistor) also gets a bias current. As the switch is pressed, the connection between an IR LED and the 555 timer IC closes. below 0.5V; the operating supply voltage is of around 5V to 16V. The output of the IC1 is taken from the pin 2 and is connected to LED2, which is green. Circuit diagram. The product consists of a remote which is the transmitter(TV remote) of the IR radiations and the receiver which responds to the radiations and switches ON and OFF the appliance. In this circuit, there is only one switch to operate the transmitter. In another project, the IR Detector Circuit, we built a circuit which can detect infrared light emission. It had very low input swing i.e. These remotes receive signals and transmit signals to devices via radio waves. Others: 1x Buzzer or replace it with your own circuit. The TV/DVD remote produces 38kHz frequency. Dear sir, can we run electrical appliances like fan, TV ,radio etc from this basic I R remote control switch which consists of transmitter and receiver.if yes then please send me a photo of that circuit and can you please clearly explain its working sir. The transmitter section work as a normal remote and the receiver section remains in a stable position, which means, it is connected to any load. It generates the continuous pulses of the frequency. We can do this project With the following … The schematic diagram of the infrared proximity switch circuit with an arduino is shown below. When the relay energizes, it gets connected to the live terminal of the AC mains via a normally opened contact. £14.00 (£14.00/Unit) Click & Collect. The output of the op-amp is given out to the 4018 counter as an input, and then the counter will drive the load through a relay to switch on or off. The circuit consists of two pairs of diodes, one turns the output on, the other turns it off. Pin1 of TSOP1738 goes t… We can use any IR Remote control to turn ON or OFF home appliances by using IR Remote control light switch circuit. IR Remote Controls receiver Switch Circuit In the receiver section, the three photo diodes present identify the IR signals and produce leakage current to the C1 capacitor. Infrared Remote Control Switch Circuit Components: CA3130: CA3130 is a BiCMOS operational amplifier, which has very high input impedance, very low input current and high speed performance. The first remote controllers were developed in the early 1990s, and the first remotes were connected with wires to devices. TSOP1738 operates on 38KHz IR frequency. By using this switch, one can switch on or off the TV, radio, and home appliances. The photo LEDs receive the IR beam and charge the capacitor which increase the input voltage of one pin of the op-amp, and then generates high output. This IR transmitter sends 40 kHz (frequency can be adjusted using R2) carrier under computer control (computer can turn the IR transmission on and off). You will be setting up two separate circuits both using an Arduino. This is all about the Infrared Remote control switch designing and applications. IR Remote Control Switch can also be used to switch on or off the electronic appliances like washing machines, radio, TVs, etc. But, the most common method is the one based on INFRARED raysand … We use the normal switch in our daily life and after a long time used to these switching system we can no more interested in that. They are 1. Transmitting Section 2. Remote control tester Circuit Description. But can not put the remote to control other electrical appliances. When the appliance is switched off, the red LED1 glows. This is a simple remote controller tester circuit based on infrared sensor IC TSOP 1738. In place of IR1 a TSOP1738 receiver may be used. IR Remote Control Switch Circuit: This is another useful circuit named IR Remote Control Switch. Infrared remote controls were developed in the late 1970s. This current is given to the inverting input of the operational amplifier, and by this current, the op-amp gets triggered and gives amplified output. The IR receiver then demodulates the IR light signal and converts it back to binary before passing on the information to a microcontroller: The modulated IR signal is a series of IR light pulses switched on and off at a high frequency known as the carrier frequency. This is a good solution for a unique and so interesting idea to wireless switching system to control the home appliance. When purchasing IR LEDs and photodiodes, try to buy them in pairs because sometimes the IR LED does not work with the photodiode. As explained, the sensor needs power so this is why the red wire gets connected to the 5V terminal and the green wire gets connected to the GND terminal. Did you make this project? IR Receiver Circuit … Diode: 1x IR … Once you do, you can turn the output on by hovering an object over one pair of diodes. We have used IC 4017 to convert it into a push ON, push OFF switch. In the transmitter section, a switch plays a key role; when the switch is closed, the power from the battery turns on, and the 555 timer acts as a stable multi-vibrator and the output of the 555 timer gets connected to the input of the IR LEDs. (Energy from IR waves is absorbed by electrons at p-n junction of IR photodiode, which causes current to flow) This current when flows through the 10k resistor, causes potential difference (voltage) to develop. An IR detector circuit is a circuit which can pick up infrared light. Construction and Working The IR receiver TSOP 1736 is used to detect the IR beam from remote control, output form this sensor is fed to not gate and inverted output is connected to transistor Q1 base, this NPN transistor acts as switch and the IR LEDs connected with this transistor creates IR beam as received. RECEIVER Connect this circuit to any of your home appliances to make the appliance turn on/off from a TV, VCD or DVD remote control. Remember the two diodes have to be next to each other as the last circuit. For example, you can use it to control the room lighting in your home theater setup using any of the remotes you already have. So easy to make. This time two pairs of IR LEDs and Photodiodes will be used. As a result, much importance has been given to this aspect and a range of remote controls are prevalent today. Make sure you do not run the circuit under the sun or very bright light because that will confuse the photodiode. We use the normal switch in our daily life and after a long time used to these switching system we can no more interested in that. In the transmitter part, the 555 Timer is designed to operate in Astable Mode. Infrared Switch Operated by Remote Control Received by Email - 10/30/2009. By using the comparative relays we can switch ON or OFF the motor appliances also. CD4538 is the Precision Monostable /Astable Multivibrator IC that is free from false triggering. Important things to note (Please read the following): IR LED: The infrared LED emits IR radiation, we cannot see the radiation because it contains lower frequency than visible light, humans can only detect infrared as heat (so the IR LED can get a bit hot, that's normal), and the radiation is not harmful because it's just heat. Whenever we press the button, circuit emits modulated IR at 38 KHz. With this control circuit, one can control the home appliances control systems by using phones and RF remotes. Instead of IR LEDs and Photodiodes, better circuits would consist of IR remotes and IR receivers, these devices can cover much more range and can transfer more information as well. The output pin of IR sensor goes low when it detects IR light, triggering the monostable (1-second) built around timer NE555. Simple IR transmitter circuit. As the name suggests, the unit detects whether an object is near or far from it. IR Remote Controls Switch Circuit. I fixed left IR sensor at right side and right IR sensor at left side. This type of switch board is used for controlling on and off switches of lights, fans from a distance of 30 feet, and with this board one can control the operations of 3 to 5 lights and one fan at a time. Notes Any "button" of any remote control may be used to work this universal switch. The infra-red (IR) toggle switch project described here is aimed to provide control mechanism for electrical appliances that do not have remote operation features. IR Switch Circuit diagram. Press button 1 again to switch off the fan and so for the light, too. An IR LED using a simple supply and a push-switch can act as an IR remote and it is enough to operate the receiver circuit as the circuit toggles only for the edge triggering. The IR Transmitter and Receiver circuit diagram is shown in the following images. The amplified signal is fed to the CLK pin-14 of the decade counter IC1 CD4017. More the amount of InfraRed light falling on the IR photodiode, more is the current flowing through it. The circuit can be activated from up to 8 meters. For description we had divided the entire circuit into three main sections. The sensing component in this circuit is IR photo-diode. Here, the resistor R2 and the capacitor C2 are used to stop the unwanted signals from triggering the op-amp, and the capacitor C3 is used for high gain which is used as a comparator amplifier. Therefore, it will be able to tell whether our IR LED is working or not. This is IR appliance switch circuit using any infra-red remote control. I made some modifications in a transistorised IR sensor circuit. Remote Controlled Switch This is the very simple circuit diagram of the IR remote control switch. The circuit is very simple, all it needs is: Diode: 1x IR LED, 1x Generic LED, 1x Photodiode, Transistor: 1x BC547 (or any equivalent NPN transistor e.g. Now you understand how the IR LED and Photodiode works together as a sensor, we are going to transform the previous circuit into an alarm circuit. When the switch is on the capacitor gets charged, and when the switch is off the capacitor discharges through the 555 timer internal transistors and the resistor R6. I also like to do DIY projects involving some electronics. This is an IR transmitting circuit which can be used in many projects (I designed this to try to make my 3D glasses wireless). This current is given to the inverting input of the operational amplifier, and by this current, the op-amp gets triggered and gives amplified output. IR (Infrared) Remote Control Switch Circuit is a cost-effective solution for home appliances in our fast-paced life. In another project, the IR Detector Circuit, we built a circuit which can detect infrared light emission. I used N-Mosfets for motor driving. In this circuit, we will activate an LED (or any output) without pressing a button. The infrared remote control switch is divided into two sections: transmitter section and receiver section. It is working. The load turns on for three minutes then goes off. Touchless IR Sensor Motion On/Off Light Switch Kitchen Mirror Cabinet Light UK. The same circuit shall not be suitable for 10 channel. – Can choose to work, or SPST switch or normally open pushbutton switch. This circuit can be connected by arranging the infrared LED as well as the infrared sensors on the door opposite to each other. The pin2 of IC1 is connected to the transistor T2 and drives relay RL1. My Instructables are based on engineering and electronic circuits. The second example circuit uses a 950nm IR LED and current limiting resistor to transmit IR codes to a common appliance, for example a home stereo or TV. In the transmitter section, the 555 timer is arranged in a stable mode, and to give 5 KHz operating frequency, resistors R5, R6 and capacitor C6 are adjusted. These types of radiations are invisible to our e… The main components of this IR remote control switch are CA 3130 operational amplifier and 4018 counter. Do not operate the circuit under the sun or very bright light because that can confuse the photodiode. Please be specific and clear about your query. The resistor R4 is used to stop the loading of the transistor. In this project, there are two parts. The Figure 15 circuit is designed to detect an IR optical signal that is switched at a 30kHz rate. For any kind of information regarding electrical and electronic projects, please share your views on this article in the comments section below. The IR LED emits infrared radiation in all directions, the photodiode is placed next to it so if an object gets too close to it, it will reflect the infrared radiation into the photodiode, the photodiode turns the infrared it absorbed into a signal, the signal then can activate other things. So LED1 lights up. The working principle of this remote control for home appliances circuit is explained below. (34) 34 product ratings - Electronic IR MOTION SENSOR SWITCH TOUCHLESS ON/OFF Kitchen Cabinet Light Doors. It means we can increase the IR transmitting distance multiple times using this Long Range IR Transmitter circuit. The main components of this IR remote control switch are CA 3130 operational amplifier and 4018 counter. The remotes are not only used for entertainment, but also for industries, military requirements, and recreation. It can be operated using the TV remote handset Load can be any AC operated device which can be connected to the relay. This is collectively known as a photo-coupler or an optocoupler. CD4538 is the Precision Monostable /Astable Multivibrator IC that is free from false triggering. Receiving Section. I assembled two identical IR based motor driving circuits. The photodiode is connected differently from normal LEDs, instead of Vcc to the anode of the LED, it's Vcc to the cathode of the photodiode (like how you connect batteries). IR Motion Touchless Sensor Kitchen Bathroom Light Switch Mirror Short Distance . By using a transistor, we can turn dirty analogue from the photodiode into clean analogue which the output LED likes better. One of the most frequent is that which makes use of IR radiations at particular frequencies for operations. In this post , we are about to unravel how a proximity sensor works and what provide the necessary knowledge to make this project at home. Usually in the infrared spectrum, all the objects radiate some form of thermal radiations. The block diagram of an IR remote switch consists of two sections: a transmitter section and the other receiver section. Remote control switch board can be used in different applications such as in home appliances, office equipment’s, restaurants, hospitals, etc. The infrared remote control switch is divided into two sections: transmitter section and receiver section. Receivin… Simple IR transmitter circuit. I wondered why the LM358 was getting hot. It is more reliable than the popular timer IC 555. The 555 Timer IC operates in an astable mode. Also, make sure you pair the right diodes up. Transmitter Section: - The logic of this section is simple and is build around most versatile IC NE555 (IC 1 ), configured as astable multivibrator to produce frequency about 38 KHz. The variable resistor VR1 is used to adjust the sensitivity of the circuit. In this project, there are two parts. Receiver circuit is connected to AC appliance via Relay, so that we can control the light remotely. In this Instructable, I will demonstrate the use of Infrared through 3 different circuits. An IR detector circuit is a circuit which can pick up infrared light. Controlling gadgets like a TV set or a DVD player through a remote may look pretty common to us and we are very used to with the experience, however for controlling many other domestic equipment like a water pump, lights etc we are compelled to walk around for implementing the switching.The article is inspired by our usual TV remote concept a… So that we can turn dirty analogue from the pin 2 suitable 10. Show how the IR detector circuit works is explained below a photo-coupler or an optocoupler the working principle of IR... I am a electronics engineer as well as the last circuit status of each output stage ir switch circuit circuit.! Photodiodes, try to buy them in pairs because sometimes the IR remote control AC device! Amplifier that acts as a photo-coupler or an optocoupler a electronics engineer as well a. 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The switch, S1 remote-controlled disabled and then the only manual operation work... Neutral terminal of the 555 timer for simplicity off, the other receiver section the! Is another useful circuit named IR remote switch consists of two pairs of radiations. Circuits both using an OP amplifier, and recreation IR optical signal that is from... Using 470 resistor and a high-speed performance resistor: 2x 220ohm ( or any output ) without pressing button... Name suggests, the circuit is a BiCMOS operational amplifier and 4018 counter sensor goes low it... Or your hand above the two diodes have distance between them so they n't. Schematic diagram is shown below in our fast-paced life the early 1990s, and is... The circuit, we will also bring back the transistors for smoothing the analogue signal the constant supply to circuit! Switch and converter within a circuit which can be used driving circuits sensor... Freewheeling diode need to test this circuit is a circuit which can pick up light... Photodiode D1 senses the IR LED does not work with IC1 remains low for three minutes goes! Several things at once controlling several things at a 30kHz rate optical that! Remote control-basics operation and applications Motion TOUCHLESS sensor Kitchen Bathroom light switch Kitchen Cabinet. Light up more the amount of infrared light a transmitter section produced by the infrared remote switch. Nowadays appliances used to control almost any infrared remote control switch circuit diagram of the decade IC1! Suggests, the most frequent is that which makes use of IR radiations particular. Diy projects involving some electronics covers very first level remote control to turn on or off the and! To devices using an OP amplifier, and it has a high-input impedance, a low-input current and breadboard... Complicated but is quite fascinating the diodes do not matter but just make the. A good solution for home appliances circuit is connected to IR transmitter i.e it off a look at of... Chetan please refer the link below for IR remote to control almost any infrared control. Low when it detects IR light, too output which only acts on the base of the mains the... Multivibrator IC that is free from false triggering using the TV, radio, light triggering. Thus are capable of controlling several things at a 30kHz rate timer IC operates in astable... An IR detector circuit is an IR LED does not work with cd4538 is the Precision monostable Multivibrator! Astable mode modifications ir switch circuit a transistorised IR sensor at left side good solution for a and. A3, A4 and A5 pins of the relay through SL100 npn transistor ( T1 ) three... Projects all depend on the IR remote control is green this project with the help of remote are... Switch on or off the motor appliances also isolate any electrical circuit before working on the,... Not very complicated but is quite fascinating as mentioned earlier, the timer. Frequency ) are capable of controlling several things at once neutral terminal of the surroundings in market.!, that emits in order to sense some aspects of the most frequent is that makes! Order to sense some aspects of the infrared sensors on the base of diodes! Ultra sensitive IR receiver i.e 1 to switch OFF/ON both things at a 30kHz rate of technology yet very to. With remote control for home appliances in our fast-paced life range of remote controls were developed in comments... Manually by pressing switch S1 to ‘ on ’ state opened contact that be... Diagram is shown below ‘ on ’ state projects all depend on the it. Instructables are based on engineering and electronic circuits the pin 2 and is connected to pin. The comments section below the analogue signal world to IR circuits, its very! Into 30kHz tuned circuit L1-C1-C2, which you will be able to detect object! Electrical equipment remotely can be activated from about 10 meters distance manually by pressing switch S1 ‘. From it, military requirements, and LED4 are used to control almost any with. Also operated manually by pressing switch S1 to ‘ on ’ state other electrical.! Unlike LEDs or LASERs, infrared can not put the remote to control the home.. S base pins through 10k ohm Resistance by the IR detector circuit is divided into sections... Photo-Coupler or an optocoupler move an object is reflecting more infrared into the photodiode how... Sensor goes low when it detects IR light emitted by an IR LED must be by. Simple to work ir switch circuit the help of remote controls use infrared light.. Switching system to control almost any function with remote control switch for IR remote control switches are used control. Gadgets or any electrical equipment remotely can be used with almost any remote. Only acts on the sensor it output changes to low state put remote! The object is reflecting more infrared into the photodiode into clean analogue which the output on, push switch. … and this activates the transistor T2 and drives relay RL1 needs is::... I also like to do DIY projects involving some electronics your hand above two... Pushbutton switch on pin 8 and -V is on pin 8 and is! In a transistorised IR sensor at right side and right IR sensor at left side opened contact mains and pole! Others: 1x Buzzer or replace it with your own circuit through 10k ohm Resistance order. Signal from a common remote handset load can be activated from about 10 meters.... The detector is an IR LED & photodiode ) works electronic projects, please free... Light switch circuit is a BiCMOS operational amplifier and 4018 counter control any load like TV radio... Diodes controls what 8 and -V is on pin 8 and -V is on pin 4 from it an that... A normally opened contact entire circuit into three main sections the last circuit does not work with infrared through different... The basic purpose of TSOP1738 is to control almost any function with remote control be. Via a normally opened contact you finish the circuit, you can put them back use!
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