In this Instructable I will show you how to make a simple infra red (IR) detector.
When your TV stops responding to the remote it is hard to tell if the TV is broken or the remote doesn't work. With this little pocket-sized gadget you will know.
Spying has become more and more accessible to the average man. Whit this gadget you can check if someone has installed a night-vision camera in you room or office.

First I am going to show you how to build it and then how to use it.

If you are just interested how IR remote control works got to step 7.

Step 1: Electronic Components

For this project you will need a couple of electronic components,all in total 3$.

1. Fototransistor (IR_Transistor);( in this chase I used RadioShack 276-0145);(picture 2)


3.Micro switch.

4.330 Ohm resistor (picture 3)

5.An electronic solder board (holes)

6. 9V battery snap

7. 9V battery

8. Rubber band

(all of the electronic components can be bought at your local RadioShack)
<p>instead of using fototransistor i can use photodiode</p>
I made one on a breadboard before I move on to making a treasure chest my son can open with his Magiquest wand. Lots of fun, thanks for this.
<p>I have been trying to make this on a bread board before soldering it and the LED lights up and stays on. Any reason why it would do that?</p>
This might be because the detector is detecting the infrared light that is being emitted by the lights in your room. If you cover the tip of the detector with your finger or turn the lights on, does the LED still glow?
<p>There are 3 different types of Photo sensitive Devices and they can look almost identical. I have bought plenty off E Bay and from sellers here and in China claiming they are such, but are in fact much cheaper less useful IR Photoresistors (LDR's) Black or clear in the same 3mm or 5mm package these make Nil output exposed to light, their Resistance just drops like in <a href="http://www.instructables.com/member/jconell1/" rel="nofollow">conell1</a> project I suspect. You need a proper Photo Transistor like the one listed, or similar like the Kingsbright L-93DP3C </p>
but it is very weak :(<br>tnx anyway it was fun to learn :)
well can we use a smt ir
<p>can we increase its range</p>
<p>can we use a ir led of a remote in place of fototransistor.</p>
<p>our body also releases heat so can we make a circuit to detect it .</p>
<br>This is a cool little circuit. I used almost an almost identical circuit to be able to close the doors on my TV/music component cabinet (extender). I just used a external power supply instead of the 9V battery. I used the imitter off an old control instead of the red LED. I love to see all the young people coming up with these ideas. MaBu.
Will it work if we build the circuit on a breadboard instead of an electronic solder board???
You could easily make this into a receiving end of a laser tag system by changing the led into an alarm and the micro switch into a switch that can stay on. <br>To make the sending end, connect a IR led to a battery, resistor and micro switch.
I made one of these years ago when i was reparing VCRs. I put it all into a atari 2600 game cartage case and the remote head fits just right in the frount to test.
Nice! Do you have some pics of it? :)
<p>I&nbsp;will have to find it ,baried somewere on my desk who knows, but when i do I&nbsp;will take some pictires of it as a whole and apart.<br /> Bill</p>
Great!<br /> Really wana see your creation!&nbsp;:)<br />
Hey Comodore I tried to uploaqd some pictures of this but 7 hours later i came back and it was still trying to upload....I can send you the pictures by email if you send it to me vader0ne@yahoo.com
Sorry Commodore ,I just found my IR tester and my Cammera.Made with old parts from a VCR and a Atati 2600 game case it was the right size for this project...Hope you like....Bill.
Wouldn't a 390 ohm be much more fitting for a 9v? Or does the transistor really put out that much resistance?
I want to be able to switch a single led on and off with the use of ir remote, I have been scouring the internet to figure this out and come up empty. Can someone please tell me how this is done? Do not need any thing fancy, just basic as possible.
so............ does this mean in theory you could build an ir aray on any digital camera and have a night vision camera?
Check out kipkays version <br />
Dear Sir, <br> <br>I think my detector is not working. When i connect it with the 9 volt battery the LED turns on from first only and when I bring it near to my tv remote and press the tv buttons nothing special happens! I have checked and rechecked the steps <br> <br>Thank You
Did you check your polarity. I don't know if this will work abut make sure your polarity is correct. Good luck <br />
I got a detector out of a a vcr that was being thrown away and when the switch is pressed the led lights up and stays that way with or without any tv remote, could the ir transistor be broken to just let current flow?
what an awesome project i wrote a blog post on it here it is:<br><br><br>http://electric-kids.blogspot.com/
can i use led from tv remote as ir transistor?
WIll the red Led Flash to the binary code preset into the remote ?<br /> <br /> Say if 1 is on and 0 is off If the code was 1 1 0 0 1 0 1 Would the Led go on on off off and so on<br />
if you replace the led with a buzzer it would be pretty cool it be like beep, beep, off, off, beep, off, beep
With a buzzer, depending on what kind you refer to, it may need it's signal amplified or converted from a pulsed DC to a waveform (if the buzzer or beeper runs on low voltage DC, then you can ignore everything I just wrote :-)
i was thinking a low voltage one but thanks for the tip :)
Well, by low, I meant &quot;very&quot; low :-) There will be less then 3 v running through the LED, so it'd have to operate in that kind of environment
yup!&nbsp; It's does just ask you explained!&nbsp;&nbsp; <br />
Ahh thank you . Will be going to maplins tomorrow to buy the components for this<br />
Good luck and keep me posted on how your project goes!&nbsp;&nbsp; :)<br />
will post a picture tomorrow if i finish it !<br />
is it tomorrow yet?
Great! Can't wait to see them!<br />
I once took an old remote from a broken DVD player and took out the IR LED and soldered in a green LED. Then I could see the remote flash as I pushed the buttons. And if you wave the remote around, you can see the 1100101 patterns and you can see that they are different when you push different buttons. Of course only do this with a remote that you no longer need, not a good idea to do this just to find out if the remote is working!
All respects!<br>But You do not need to built this!<br>Reason:<br> - You have a mobile phone with camera (any format)<br> - Turn Your camera on mobile phone ON<br> - Point camera at front of remote (20-30cm)<br> - press button on remote<br> - if button send IR command You will SEE white beam from the IR LED!<br> - Repeat press all buttons on remote and check IR LED response !<br><br> MOBBILE PHONE CAMERA SEE IR LIGHT !
One reason TO make this is to have a seperate circuit to work with for other projects: sound sources, turning on or off other switches, etc with IR, ...there are a host of reasons TO build this; even if only to learn how it works.
some people dont have a camera and i think this is a neat project
I once had a stereo that if I were to hold the switch on my halogen bed lamp close enough to the on position that it would make the light flash, I could make my stereo open/close the CD drawer, or even change the volume, depending on how close or far the contacts of the switch were apart.
That is very interesting, I never heard something like that, but I can bet you there is a scientific explanation for it! Hmm, interesting, tell that to teck-king, he might have an explanation....
I wonder if one of the LED's isn't &quot;detecting&quot; the signal? That can happen, but normally only if there is a voltage already applied to the circuit.
possibly the halogen lamp emits a flickering ir signal (all heat consists of ir rays)from the mains 60Hz/50Hz and then the device gets &quot;confused&quot;?
Sounds very likely...I didn't know then what I know now about that kind of stuff, though it's marginally more now...XD
Oh likely, but it was still neat to do. I think the stereo that did it was the one I also blew the amp in...

About This Instructable


272 favorites


Bio: stanislav.drca@yahoo.co.uk stanislav.drca@gmail.com ______________________ One of my favorite inventors, and one of the most brilinat minds that ever walked ... More »
More by comodore: How to Make an Electronic Metronome LED Snake Film Canister LED Flashlight
Add instructable to: