Picture of Turn any IR remote control to a wireless control ON/OFF switch
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)
TSOP1838 (Vishay IR receiver 38Khz)
Caps: 10uF, 1uF, 0.1uF
Resistors: 18K

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kittt10 days ago

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)

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].




[4] http://www.dummies.com/how-to/content/electronics-components-555-timer-chip-in-monostabl.html

bic (author) 4 months ago

You need to provide a 5V input to the cirduit.

To control the relay you need some sort of driver such as a power transistor or an IC such as ULN2003.

kehaldoshi4 months ago
Where should 5v input in this diagram ?
kehaldoshi4 months ago
Where should 5v input in this diagram ?
kehaldoshi4 months ago
Very great tutorial can u explain hot to connect this circuit with relay module ?

Hey Guy, Is the circuit with the 555 IC and TSOP1838 is the circuit for the receiver, then the remote is the transmitter?

DanielRB126 months ago

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

Vaishali447 months ago

I've connected the circuit, as shown in the fig.

What should I do to check its working?

What do I connect in the output?

Should it be a pnp transistor used as a switch?

Please reply.

lprasad17 months ago

Please tell me OK circuit because your schematic & step 4 diagram are not matching with circuit diagram

nawnit.sen.18 months ago

sir, can u please tell me the use of 10micro F capacitor here

bic (author)  nawnit.sen.18 months ago

It is for noise filtering, and decoupling.

nawnit.sen.18 months ago

sir, can u please tell me the use of 10micro F capacitor here

hgrancho1 year ago

sir? can we make it as a switch to a contactor? we badly needed your reply. thanks.

bic (author)  hgrancho1 year ago

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.

Samiran bic9 months ago

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.

bic (author)  hgrancho1 year ago

what is a contactor?

hgrancho bic1 year ago

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.

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.

sumon1010 months ago

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)

Al-MuhaditA11 months ago

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 * https://www.facebook.com/profile.php?id=100005274... * Thank you

BINYROZAR1 year ago

sir can u plzzz help me for my project...

i want to do a project..that is ""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 ..

i badly needed your reply. thanks.

divudi21 year ago

it is great, simple and easy to handle single appliance., great.

bic (author)  divudi21 year ago
Simplicity is the design goal here.
Thank you.
hgrancho bic1 year ago

how do we connect this circuit to an appliance? or is it safe to make it as a switch to an appliace?

hgrancho bic1 year ago

how do we connect this circuit to an appliance? or is it safe to make it as a switch to an appliace?

samighi111 year ago

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 "lego city" we are building), how do I tell which button is pressed remotely, so I know what to trigger?

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?

thank you


bic (author)  samighi111 year ago

The circuit will trigger on any key press. That's why the design is kept simple.

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.) & which pins are connected to ground(-ve).pls tell me about these.

i know that the components one terminal should have to connect to middle pin of tip1838 but which? -ve/+ve?
And where to connect another terminal of component?

whinh pins are connected to power supply?
how to connect the capacitor of 10mF?

pls tell me about these.........................

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.

Wonder if you have solved this yet...

The little triangular marks means it's connected to ground, when using battery that's usually the negative pole.

Lots of IR ,RF and wireless remote control receiver and transmitter,pls contact me,Skype ID:jia98851,Email: wyl@zdremote.com. http://preview.alibaba.com/product/1861573545-212930085/Sound_sensor_light_remote_control_switch_with_push_cover.html

devangs31 year ago

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!

Mohaideen1 year ago

I want to make IR blaster. Its operation is, tv and such that devices are controlled by mobile. have any idea about this...
mpep1 year ago
Simple and effective. Well done.
indiasomu2 years ago
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.
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
danw20022 years ago
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.
bic (author)  danw20022 years ago
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.
my wookie2 years ago
that's just sweet, think you could hook it up to different things through different buttons?
shawaj2 years ago
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?

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