9V IR Detector

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9V IR detectorby Candymanproductions on April 15, 2011

Table of Contents

9V IR detector ................................................................................................................

Intro: 9V IR detector ........................................................................................................

Step 1: What you need ......................................................................................................

Step 2: Assembly Part 1 .....................................................................................................



Step 5: Soldering ..........................................................................................................

Step 6: A bit more soldering ..................................................................................................

Step 7: Cutting ............................................................................................................

Step 8: Attaching the 9V battery clip ............................................................................................

Step 9: Using the mounting tape ...............................................................................................

Step 10: Glue is the solution ..................................................................................................

Step 11: Last Step! .........................................................................................................

Step 12: You're done!/Problemfixes .............................................................................................

Related Instructables ........................................................................................................ 1

Comments ................................................................................................................ 1
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Intro: 9V IR detectorThis is a great, simple project to make a small and robust 9V IR detector. It can be used to seek out security cameras that use infrared light to "see" or to check if youremote control is still working.

Image Notes1. LED2. 330 ohm resistor

3. IR Phototransistor4. 9V battery clip5. Hey! My fingers!

Step 1:What you needFor this project you will need:-A 9V battery clip with a flat cover made of plastic-A 9V battery-LED (any color although it should be clear in order to see it better)-330 ohm resistor (orange-orange-brown-gold or silver)-Infrared Phototransistor-perf board (see 2nd picture)-double sided mounting tape-wire-needlenose pliers-wire snipper-dremel or hack saw to cut perf board

-clear epoxy-like glue-Soldering equipement: -soldering iron -solder with flux core

Image Notes1. 330 ohm resistor (orange-orange-brown-gold or silver)2. 9V battery clip (cover made of plastic and flat3. LED (any color although it should be clear in order to see it better)

Image Notes1. This is the kind of perf board you should use


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4. IR Phototransistor5. perf board

Step 2:Assembly Part 1First up is putting the LED in. Bend the leads over and insert it in the perf board like in the picture (note that you should start in the corner to make our application as sas possible)

Image Notes1. LED2. shorter lead (negative lead)3. long lead (positive lead)

Image Notes1. leads bent over

Step 3:Assembly Part 2Next, put in the 330 ohm resistor like in the two pictures.

Image Notes1. LED

2. 330 ohm resistor

Image Notes1. resistor lead

2. resistor lead

Step 4:Assembly Part 3The last step is to insert the IR Phototransistor like in the pictures. Pay attention that with this part the long lead faces the negative pole.


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Image Notes1. IR Phototransistor2. 330 ohm resistor3. LED

Image Notes1. Long phototransistor lead2. Short phototransistor lead

Image Notes1. Make sure that the short lead doesn't touch the other leads

Step 5:SolderingAfter step 2-4 you'll need to solder the parts to the perf board to make your detector usable.If you're a first-time solderer, you should watch this video: http://www.youtube.com/watch?v=I_NU2ruzyc4 .(I didn't make the video, thanks go to CuriousInventor)After soldering, your project should look like the example in the first picture.Then, clip off the excess component leads, making sure not to break the solder joints.
http://www.youtube.com/watch?v=I_NU2ruzyc4


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Image Notes1. These joints must be connected

Image Notes1. Carefully clip off the leads2. Keep the longest leads

Step 6:A bit more solderingTo finish off the soldering part, you'll need to connect two soldering pads like in picture 1.For the bridge you can take a snipped off lead from one of the components. I first bent my lead to put it through

the holefor stabilisation like in picture 2, but you don't have to. The result is all that counts.

Image Notes1. Soldering joint2. Other soldering joint3. bridge

Image Notes1. This part goes through the hole2. This is going to be the bridge

Step 7:CuttingAfter soldering, you'll need to saw/cut off the excess perf board.Make sure you leave space for the negative & positive wires that are connected to the battery.


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Image Notes1. battery wires go here -> leave space!

Image Notes1. Battery wires go here -> leave space!

Step 8:Attaching the 9V battery clipTake your hardcover 9V battery clip and cut it's wires to about 1/2 inch (1,4mm) lenth like in the 2nd picture.Then solder the battery clip to your detector and make sure you get the polarity right!After soldering your gagdet should look like pictures 3 & 4.

To prepare it for the next step, twist the 9V battery clip so it can be bent under the circuit like in picture nr.1.

Now is a good time to check if your device works. Carefully clip it on a 9V battery.If you try it out during the day, the LED will be partially on depending on how bright it is where you are.To be sure that it works point the Phototransistor to the sun/roomlight and put your finger over it.The LED should get dimmer when your finger is in the way. If nothing works, check out the last step for possible solutions.


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Step 9:Using the mounting tapeNext up is fastening the circuit to the battery clip, the most efficient way I found is to use double sided mounting tape.To keep everything in place for the tape to stick and for the next step I used wire to wrap it up.

Image Notes1. Twist the wire to hold the detector together2. Mounting tape3. For best results wrap the wire over the resistor

Image Notes1. The mounting tape should be as big as the circuit and should cover all theconnections.

Step 10:Glue is the solutionTo ensure the detector's long life, glue is used. Just cover up the circuit (except for the LED and the IR Phototransistor), the border on both sides of the mounting tapeand the wires from the battery clip with a thin coating of epoxy glue. Let the glue dry over night.


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Image Notes1. Put a thin coating on the circuit2. Leave out the Phototransistor (and the LED)3. Leave out the LED (and the Phototransistor)

Image Notes1. Make sure to cover the ends of the perf board and mounting tape

Image Notes1. To prevent the wires from being ripped off cover them too.

Step 11:Last Step!After letting the glue dry take off the wire used to let the mounting tape & glue bond.If you have problems taking off the wire then you've put too much glue on, but that won't affect thefunctionality of your device.


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Image Notes1. After the wire is removed

Step 12:You're done!/ProblemfixesIf you jumped to this step because you have problems with your devices:1. Check if your battery has enough juice (the "putting the contacts on the tongue" trick will work)2. Make sure all the solderconnections are nice & smooth

3. Check if there any shorts in the circuit (solderbridges that shouldn't be there)4. Check if any leads/wires from the parts or battery connector are broken, sometimes too much stress on the parts makes them break.5. Did you put the LED & Phototransistor in the right way around / did you get the polarity right?

-----------------------------------------------------------------------------------------------------------------------------For all the others:Fetch a 9V battery and try your IR detector. Clip it on and... you're done! Have fun!

Comment, rate & follow!

Image Notes1. 9V battery2. The LED should light up

Image Notes1. sideview


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Comments

11 comments Add Comment

rtty21 says: Apr 30, 2011. 7:49 PM REPWhere do you find your pad-per-3hole perforated board? lol! perforated board sounds so much more technical and geeky than perfboard!

Candymanproductions says: May 1, 2011. 3:44 AM REPyou should check for cheaper pricing but here is an example:http://www.allelectronics.com/make-a-store/item/ECS-3/SOLDERABLE-PERF-BOARD-3-HOLE-PAD//1.html

compaqxp123 says: Apr 27, 2011. 6:15 PM REPI've wondered if you could send music over IR. For example have a transmitter hooked up to the radio, nothing complicated there, and have a recived on thother end connected to an amp.

Perhaps I'll try and Idea I have.

blackdragon27 says: Apr 29, 2011. 5:57 PM REPhere is the same concept but with lasershttp://www.youtube.com/watch?v=HKRPfa66_po

they also have those ir headphones you could find the schematic for that and alter it for your use.

carmaster says: Apr 29, 2011. 7:03 AM REPThat will not work directlyyou have to modulate the signal with a sine wave, producing varying intensity values which can then be picked up by the receiver

or you can use an A to D converter and transmit the data digitally, on/off the IR transmitter.

That would be a cool project but... no use?
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