Receive Infrared with IR LED

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George Sephton

Senior Member
Ive searched around the forums but without luck, im about to start making an ir circuit but apparently (according to the manual) the ir receiver has 3 pins and is a module. I have an ir receiving led (attached) is it possible to use these instead of the module?
George S.
 

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hippy

hippy

Ex-Staff (retired)
You can interface an IR photodiode ( which I guess it is ) to a PICAXE but it will require some amplification to get the signal levels suitable, plus it will not demodulate an IR stream, so you cannot decode data sent using INFRAOUT without using the IR Receiver chip ( three legged ) and INFRAIN.

You can probably find a circuit to do the demodulation with an IR photodiode but it will be far easier, simpler, better and more reliable to use the IR Receiver which has that circuit built in.
 
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manuka

Senior Member
Your image is too fuzzy -down here in the summery South Seas anyway-to see IR diode internals, but I assume it's just a simple non amplifying detector. What are you trying to do? Data or just detection? If just detection then consider a digital camera, or simple discrete circuits => http://hackedgadgets.com/2007/11/10/ir-detector-circuit/

For IR data forget 2 legs- well IR 2 legs anyway- as Vishay style 3 leg IR versions are such an all in one rip snorter that I'd STRONGLY recommend using them. Although more costly, they consist of an infra-red photo diode detector and signal processing circuits, (amplifier, limiter, bandpass filter & demodulator), & detect the ~38kHz modulated pulse from an IR remote control (or sending 08M) to give a TTL level output.

As both Tx & Rx IR encoding/decoding features & commands are 08M inbuilt,the IR datacomms field has become almost redefined around them as a result. Read the PICAXE manual!
 
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Michael 2727

Senior Member
You can sometimes recycle the IR Detector from an old VCR, CD or DVD player.
As long as they don't operate at some obscure OEM frequency.

You could probably dumb-down a normal IR or Photo detector to ignore the 38KHz
part of the signal and just spit out the raw data blocks. You make the frequency response
of your IR/Opto detector slow or sluggish by adding a small capacitor across the output.
You will probably still need a small amplifier anyway.
But as Hippy said, just go buy a proper IR Detector, as all the hard work is done for you.
 
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BeanieBots

Moderator
My advice is get a 'proper' three pin demodulating detector.
However,
You if you only want short range in a "quiet" environment you might get away with a simple amplifier such this:-
http://www.tkk.fi/Misc/Electronics/circuits/irdetector.html
but you would not benefit from the reasons behind modulating in the first place.
Another (still somewhat simplified but better) approach would be this:-
http://online.physics.uiuc.edu/courses/phys405/P405_Projects/Fall2005/Nabil_IR_Remote_Control_Demodulation.pdf
 
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George Sephton

Senior Member
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westaust55

Moderator
George Sephton said:
No Jaycar are just australia and NZ
Click to expand...
Jaycar Aust website gives:
United Kingdom techstore@jaycarelectronics.co.uk
Techstore United Kingdom Ph 0800 032 7241

http://www.jaycarelectronics.co.uk/

http://www.jaycarelectronics.co.uk/productView.asp?ID=ZD1952&CATID=&keywords=ZD1952&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

£1.95 ea so Rev Ed / Techsupplies at £0.48 ea are cheaper.

.

Then as BB states, Rev Ed also sell the same type of device.
 
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eclectic

Moderator
@George.

Just my opinions:

If you go the Rapid way,
you could stock up on Picaxes and other components, for future use.
Easy to achieve the £35 postage free threshold.

It might be worth thinking about the 55-0902 receiver.
http://www.rapidonline.com/Electronic-Components/Optoelectronics/Infrared-Devices/Infrared-photo-modules-38kHz/71292/kw/infra

It's wired in the same way, but works down to 2.4 volts.


@westaust55
I've bought from Jaycar, a couple of times.

http://www.jaycarelectronics.co.uk/delivery.asp

£5 delivery charge is OK, but, it takes a long time to arrive. :-(



e
 
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Dippy

Moderator
Wise move George.
42p is peanuts even if there is a couple of quid for carriage.

As a slight aside, please may I stir things up?
It is Christmas after all.
(NOTE: I am NOT talking about George here)

Why oh why do so many people moan and whinge about a few quid for carriage?
I know some places are expensive, so I put those ridiculous ones to one side.
But most charge 4 or 5 quid delivery (usually free over X pounds/dollars/goats whatever).
Whats the problem?

You have to pay some bloke to hunt down your products from a bin in a warehouse.
Someone has to confirm that the item has been packed and enter it into the stock database.
Someone else has to pretend to check it and then stick it in a packet.
In many cases it goes by a next-day Carrier and has to be signed for.
Or, often in UK, by recorded delivery (signed for) which will cost a quid plus the price of a Jiffy bag.
Suppliers are not charities.

And, in many cases, if the product is a bit sicky, they will replace it FOC with FREE carriage.
Examples: Rapid, RS Components, Farnell and CPC and probably dozens of others.

And I guess these same people wonder why Microchip (and others) have mostly stopped FREE samples to the General Public.

At this time of year, it beggars belief that Scrooge is alive and kicking....

PS. I don't hear anyone moaning about Amazon 'partners' who advertise stupidly cheap headline prices then charge stupid amounts per item and not per order....
now that's a rip off!
PPS. Notice I have whinged about Amazon and not Ebay for a change.

Happy Christmas to tout le monde in Toutes le Monde. (Apologies for pidgin)
 
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George Sephton

Senior Member
I know you weren't aiming it at me but just to say £5 really is a lot to me as im only 16 and don't have a job or anything, I rely on summer jobs and birthday money so I dont want to waste loads of my money on £5, thats why I buy off ebay as its cheap and postage isn't fixed.
 
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BeanieBots

Moderator
Club together with a few friends and/or make the order worth while with a few extra itmes. I always have a list of "bulk up the order" items such as caps and chips which will be needed tomorrow if not today. Always have a stock of consumables such as perf-board. Only buy consumables as order bulking and ask around if anybody else wants some.
Many do free delivery with orders over £35 or there abouts.
 
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boriz

Senior Member
"im about to start making an ir circuit"

Dunno what that means. Maybe the two leg device will work just fine. Depends on what you are trying to do. What is transmitting the IR signal? Is it data? Remote control? Beam break?
 
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