Electrical Engineering Stack Exchange
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Questions tagged [infrared]

IR is electromagnetic radiation with wavelengths from about 750 nm to 1000 µm, which is beyond the nominal red edge of the visible spectrum.

Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) in the spectral band between microwaves and visible light (the nominal red edge of the visible spectrum). It is invisible to the human eye.

IR is generally understood to encompass wavelengths from around 750 nm to 1000 μm (400 THz to 300 GHz).

(From: Wikipedia)

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How to build an IR Repeater?

I have a digital cable box that lives in a wooden cabinet under my tv. I would like to use the remote with the doors to the cabinet closed. It looks like an IR Repeater runs about $30+. Can one be built easily for less?
NotDan
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IR rays over carrier frequency of 34Khz?

How is IR rays that have carrier frequency of ~1014 Hz generated by GaAs in remote control carried over carrier frequency of 34Khz to the sensor?
sk1
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Confused by IR pulses

I'd like to decode some IR signals from a TV remote control. I scavenged a 3 pin IR receiver from some old junk and hooked it up. From what I've read about RC-5, I was expecting to see a start bit indicating the bit time, which I could synchronize…
Toby Jaffey
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Sharp Infrared sensor-Filtering supply ripple

I am using Pololu's sharp infrared sensor board part# GP2Y0A60SZLF and I am trying to minimize the noise caused by the sensor on the voltage supply as much as possible. I have made a filter and voltage regulator circuit as shown below, The IR…
Rocky79
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Receiving continuous 38khz IR signal

I want to detect objects crossing a line. I decided to use one IR led (with a 555 circuit to generate a 38khz signal) and one 38khz receiver (TSOP1738). But after testing it on a breadboard I found out that TSOP1738 has gain attenuation, if it…
ahmadx87
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Better Solution to Taping IR Emitter and Receiver Together

I have an HDMI Matrix switch, cable boxes and DVR in a central cabinet that services all of the TVs in my home. The matrix switch allows the sharing of the cable boxes and DVR between all of the TVs. The matrix has IR input and output ports for each…
James P
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Purpose of 1 microfarad capacitor in IR receiver circuit

What is the purpose of the 1 microfarad capacitor in this circuit? The source webpage says: Output of TSOP1738 oscillates at the rate of 38KHz, which is applied to clock pulse of 4017. So we have connected a 1uF capacitor across the output of the…
user1764381
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How to use 2 TSOP1738 (infrared sensor) in one circuit?

Attached picture shows my circuit. In it I use only one IR sensor (TSOP1738) but now I want to add another IR sensor (TSOP1738) to my circuit. So my questions are: 1. Is it possible? 2. How (parallel or series)? Thanks.
Hosein
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Eliminate noise from IR sensor

I have a 5v infrared beam reflection circuit for capturing heart beat from fingertip. I am using LM324 low pass filter to filter out the noise and i have isolated the ir sensors by covering the sides with a black tape but the noise is not…
ArJay
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Infrared LED binary code

I'm a noob of electricity and circuits, so please keep that in mind. Devices have some IR binary codes to operate a function. For example, binary code of a TV for "volume up" is 0001 0111. What do these bits represent? I guess they represent…
Vitiello
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Is there any material from which lenses are made which are fine with IR signal? I mean really cheap ones

I am making a prototype where I need to direct the flow of the IR signal at some specific point. I found out that glass material doesn't work properly in combination with IR. Is there any cheap lens which can do that with IR? The main purpose is to…
Ondrej Tokar
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Best cover for IR proximity sensor?

What would be the best type of cover/front panel for a circuit board that has an IR proximity sensor consisting of an IR LED and an IR photdiode? Would regular plastic/plexiglass work or would that reflect the emitted IR too much and screw up the…
David Högberg
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How to make/duplicate a NEC Infrared Transmission Protocol

what i am trying to achieve to be able to duplicate/recreate the infrared signal of my remote control using my arduino. The arduino has a already a library for this, unfortunately it doesn't seem to support the board that i am going to use the…
Jake quin
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IR beam breaker - range issue

If I can just call on you again to help me advance in a project. My infrared beam breaker circuit is lacking in range. I would need it to be able to bridge a doorway, so about a meter. On the receiver side, I am using TSOP1236, which can be…
Nils Deschrijver
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What is the maximum lumens an Infrared LED can dissipate?

I am planning to shoot a video under Infrared light and want to choose a ton of the right size so that the entire room is illuminated. I am on to build a separate circuit if need be for better visibility. Please suggest
Satish Kumar
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