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From: Richard Rasker
Newsgroups: sci.electronics.design
Subject: Re: Infrared led tester
Date: Thu, 19 Dec 2002 14:55:38 GMT
Organization: de Kooi Internetdiensten
Message-ID: <20021219.14553800@techno.linetec.nl>
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On 12/19/02, 3:35:25 PM, "Gregory Calvert" wrote:
> Anybody know of an easy way to test ir leds? Be gentle, I'm a beginner=
.
Very simple: make sure you have an appliance with a working remote=20
control unit, preferably a TV or radio with an indicator led that blinks=
=20
when a valid IR signal is received.
Push one of the continuous function buttons on the remote (e.g. the=20
button to lower the volume). Keep this button pressed, switch on the IR =
led (by driving it with 20 mA) and check if the appliance stops receivin=
g=20
the remote control signal the moment you switch on the led. The idea is =
that your led will "blind" the IR receiver for the remote control signal=
.=20
(This is also the method I use to check whether an arbitrary remote=20
control unit is working or not.)
You may have to fiddle around a bit with distance and direction of both =
IR sources - leds in a remote control are often driven with considerably=
=20
more current than 20 mA (but only during short bursts), so even a workin=
g=20
IR led can not always block the sometimes stronger signal from a remote =
control. Also, receivers usually compensate for more or less constant=20
background levels of IR light, so this might only work for a second or s=
o=20
- although you can overcome this by quickly switching your led on and of=
f=20
with a pushbutton.
Regards,
Richard
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