While building a Toastmaster timer, I needed a switch to act as a Start/Stop switch. I first built it with a long flexible coax cable, but as time went on, it turned out to be impracticable: it could be too long and people could trip on it. So I was looking for a circuit to remotely control the timer without wire, and it almost has to be cheap and built from readily available household components. Let's see what do I have around my house which can function as a wireless device. Eureka! a bunch of  old and abandoned IR remote controls.
The idea is very simple: the IR remote control sends out a stream of 10 bits, and the simplest way so far to convert this stream to a simple pulse is using an One shot circuit to generate a simple pulse when any remote button is pushed.

## Step 1: Component list

Very short: 2 IC and 4 passive elements.

555 (8 pin)
Caps: 10uF, 1uF, 0.1uF
Resistors: 18K

<p>the circuit is rapidly turning my LED on/off and not giving one output at once. what should i do?</p>
Well, he's using a timer, so if you do something wrong it's dead
brother plz give me a perfect and simple remot controll ckt via email.Ayan.megamind25@gmail.com..this ckt is not working..I need one.plz brother
<p>Can I use it to control an electromagnetic ?</p>
<p>Thanks for the introduction to a 555 timer's Monostable Mode/Operation. This circuit depending on the R and C will give you the delay timer capabilities of an egg timer, cool right ? The governing law is the time constant of t (sec) = 1.1*R (ohm)*C(farad)</p><p>There are other modes, including Bistable (of 2 digital outputs, HIGH, and LOW), and Astable(of waveform signal). Try to read [1], [2], and amazing i'ble by [3].</p><p>[1]<a href="http://www.ti.com/lit/ds/symlink/lm555.pdf" rel="nofollow">http://www.ti.com/lit/ds/symlink/lm555.pdf </a> </p><p>[2]<a href="http://www.ti.com/lit/ds/symlink/ne555.pdf" rel="nofollow">http://www.ti.com/lit/ds/symlink/ne555.pdf</a></p><p>[3]<a href="http://www.instructables.com/id/555-Timer/#step8" rel="nofollow">http://www.instructables.com/id/555-Timer/#step8</a></p><p>[4] http://www.dummies.com/how-to/content/electronics-components-555-timer-chip-in-monostabl.html</p>
<p>You need to provide a 5V input to the cirduit.</p><p>To control the relay you need some sort of driver such as a power transistor or an IC such as ULN2003.</p>
Where should 5v input in this diagram ?
Where should 5v input in this diagram ?
Very great tutorial can u explain hot to connect this circuit with relay module ?
<p>Hey Guy, Is the circuit with the 555 IC and TSOP1838 is the circuit for the receiver, then the remote is the transmitter? </p>
<p>what is the output of the 'out' in this circuit? should i pair it with the + or -? also, i still get a pulse output from the out. i only had a 10k resistor on hand. would this be the case? i need a circuit that switches negative and give a solid output while the ir is receiving a pulse. and is just an open circuit when it is not receiving signal. can you give me a bit more info here? thanks</p>
<p>I've connected the circuit, as shown in the fig.</p><p>What should I do to check its working?</p><p>What do I connect in the output?</p><p>Should it be a pnp transistor used as a switch?</p><p>Please reply.</p>
<p>Please tell me OK circuit because your schematic &amp; step 4 diagram are not matching with circuit diagram</p>
<p>sir, can u please tell me the use of 10micro F capacitor here</p>
<p>It is for noise filtering, and decoupling.</p>
<p>sir, can u please tell me the use of 10micro F capacitor here</p>
<p>sir? can we make it as a switch to a contactor? we badly needed your reply. thanks.</p>
<p>This circuit only provides you with a digital output. To operate a AC switch, you need a relay. If you don't know what I am talking about, then don't try to build such a circuit, it may be dangerous messing with 120 or 220V.</p>
<p>I think you have to use a relay 12V to make and break the contact of 120V AC or 220V AC. But the continuous power required for the relay to latch is much higher than 200mA of current safely handed by 555. I would also suggest to use a Darlington Pair with Blocking diode (TIP120) or Motor driver IC (L293) to handle Eb or Back EMF of the Relay Coil. I will post a circuit if interested.</p>
<p>what is a contactor?</p>
<p>sorry for the late reply sir. we are planning to make a project which is a wireless switch for a motor. and to make it we need something that is like this circuit. yes , we need a relay to switch the contactor. and the contactor will switch on the motor.</p>
<p>we will connect a circuit to a relay in which when it will be trigger by a signal through a ir remote it will energized the relay and closes the contact of the contactor.</p>
Hi
<p>Sir, Could i know that how to design this circuit to get the out put voltage around 12V ?(And input voltage should also around 12V)</p>
<p>hi, I want to make a circuit wireless attaching plane and control wireless, control by the left and right, above and below and do not forget engine plane means five points of control , Here's my account on Facebook and you please e-mail me * <a href="https://www.facebook.com/profile.php?id=100005274394656" rel="nofollow"> https://www.facebook.com/profile.php?id=100005274...</a> * Thank you</p>
<p>sir can u plzzz help me for my project...</p><p>i want to do a project..that is &quot;&quot;FACEBOOK OR TWITTER THROUGH CONTROLLING A TOY CAR...for that what component required and circuit required,,if there any program required so what it is..i want do on a breadboard .. </p><p>i badly needed your reply. thanks.</p>
<p>it is great, simple and easy to handle single appliance., great.</p>
Simplicity is the design goal here.<br>Thank you.
<p>how do we connect this circuit to an appliance? or is it safe to make it as a switch to an appliace?</p>
<p>how do we connect this circuit to an appliance? or is it safe to make it as a switch to an appliace?</p>
<p>I will get the parts to make this circuit and test it. What I am confused about is if I make 10 of these (for local &quot;lego city&quot; we are building), how do I tell which button is pressed remotely, so I know what to trigger? </p><p>Example: a) will this trigger on with any key press of a remote for this frequency? b) is it keyed to a specific key press on a specific remote+key?</p><p>thank you</p><p>sa </p>
<p>The circuit will trigger on any key press. That's why the design is kept simple.</p>
i have completed the circuit but its not working. i m confused about to which pins connecting any component to run(eg. motor,led,etc.) &amp; which pins are connected to ground(-ve).pls tell me about these.<br><br>i know that the components one terminal should have to connect to middle pin of tip1838 but which? -ve/+ve?<br>And where to connect another terminal of component? <br><br>whinh pins are connected to power supply?<br>how to connect the capacitor of 10mF?<br><br>pls tell me about these.........................<br>
<p>from the front side of TSOP1838 , 1st pin from left is Signal out, 2nd middle pin is for Ground and 3rd right side pin is for +ve voltage. </p>
Wonder if you have solved this yet... <br><br>The little triangular marks means it's connected to ground, when using battery that's usually the negative pole.
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<p>This would work well with the Arduino too, when there would be only a requirement of only level based changes, saves controller code :) good work man!</p>
Hi, <br> <br>I want to make IR blaster. Its operation is, tv and such that devices are controlled by mobile. have any idea about this...
Simple and effective. Well done.
great idea. Thanks for the idea. You are very right using 555 IC there are some false triggers or some time due to sun light. i am so clear with the schimet trigger circuit. <br>i want to use your circuit to switch ON/OFF the light or fan in my room. can you help me what is the modification i have to do
hi, is this a latching On/Off switch, or momentary? i need to just have a momentary on contact to start /stop a recorder remotely. Just need to complete the circuit every time i push the remote, this looks like it is close, just not sure if it is momentary or not ,what kind of range? i have a small canon remote from a camera that would be real nice if i could use...thanks.
So long the remote button is pushed, the circuit is activated. Once you release the remote button, the circuit is deactivated. The range is quite far, it would bounce off the wall as well. <br>Bic
that's just sweet, think you could hook it up to different things through different buttons?
hi, i just wondered if this could be integrated in a startup/shutdown switch for a computer? how would it fair with other ir devices and remotes being used in the same area? would it respond to any ir signal? <br> <br>thanks
Can I use this circuit for powering on my computer CPU instead of the push on-push-off button?
If you know how to design a relay driver circuit. What you need is a driver: ULN2003, and a 5V relay like the TQ2-5V. A nice feature of the ULN2003 is that it has an internal diode, and the logic is TTL. <br>Bic
Can you provide a schematic for this? I am new to electronics so it would be hard for me to design this circuit .thanks
The transmitter is the Remote control: any remote control, any pin.<br>Receiver is the integrated TSOP 1838.<br>Pin 3 is the logic 0-5V acting like an ON/OFF signal. This can be used on a transistor switch.<br>Off course if you want to control a relay, you may need a little bit more circuit.
As I understand the transmitter is just a basic IR remote control like for TV and audio. TheIR Receiver is a TSOP1838. These are available for peanuts and have ground, a plus and a signal pin.<br>The TSOP1838 picks up the signal from the Remoet control, regardless which button is pressed and puts that on its signal pin<br>The schematic is such that the 555 reacts to ant signal coming in and gives a pulse on its outpu