Re: Infrared transmitter/receiver ?
From: John Fields (jfields_at_austininstruments.com)
Date: 07/16/04
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Date: Fri, 16 Jul 2004 15:17:16 -0500
On Fri, 16 Jul 2004 18:47:10 GMT, "Zucker" <zuckuss@comcast.net>
wrote:
>I am in the process of making an infrared transmitter/receiver circuit. The
>transmitter is made up of an infrared LED in series with a 180 ohm resistor.
>The receiver is made up of infrared transisitor in series with a 50k pot.
>The junction of the transistor and pot is sent to the input of an LM324
>configured as a comparator.
>
>I can only space the transmitter and receiver two feet apart before the
>comparator's output goes from high to low.
>
>I need the circuits to be four to six feet apart. Does anyone have any
>suggestions on how to increase the distance?
--- 1. Get an IRLED with a narrower beam. 2. Get an IRLED with a higher power output. 3. Pulse the LED you're now using close to its maximum current/duty cycle limit. 4. Collimate the output of the LED you're now using. 5. Match the LED and phototransistor's wavelengths. 6. Drive the LED with a 40kHz carrier modulated on-off and use a 40 kHz receiver to recover the modulation. 7. -- John Fields
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