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Questions tagged [infrared]

IR is electromagnetic radiation with longer wavelengths than those of visible light at 0.74 micrometres (µm) to 300 µm, which is extends the nominal red edge of the visible spectrum.

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Demodulation of a 38 kHz IR PWM signal

I want to learn how to demodulate a 38 kHz IR PWM signal.(Such as that transmitted by a TV Remote Control) I know it can be demodulated easily using a TSOP1738 IR receiver. I realize that the ...
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Switching 3.3V with a Raspberry Pi gpio pin

I recently bought an IR Camera for my Raspberry Pi, something like this: https://www.amazon.com/kuman-Raspberry-Camera-Module-Supports/dp/B01ICLLOZ8/ref=mp_s_a_1_17?crid=M3FSU2COLT5W&keywords=ir+...
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Finding the right multiplexer for my project?

For my project, I am cycling through IR emitters, turning them on and then off. For every emitter, I'm also cycling through all IR receivers, collecting their analog data. I want to use a multiplexer ...
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Help identifying an SMD component [duplicate]

I need help identifying an SMD component it is a small(1 mm X 1.5 mm) black part with an "O" written on top if it. I think it is a Schottky diode for reverse polarity protection ?. (Source, first ...
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58 views

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 ...
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38 views

Light illumination method for video camera and CV detection

My control application implements human face detection and recognition with using of CV library. My device uses usual VGA USB video camera. Problem: Good and uniform light illumination allows ...
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87 views

Infrared High Intensity LED with two anodes?

I got an infrared led emitter, with model ""L1I0-0850060000000" and the datasheet is plenty of technical data but I can`t find why it has three terminals - 2 anodes and 1 catode. Usually it's used for ...
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4answers
138 views

Broadening LED spectrum possible? [duplicate]

I suspect the answer to this is going to be "no", however, just in case anyone knows something... I need to broaden the emission peak of a near IR LED. Is there any generally applicable method of ...
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37 views

Thermopile output voltage range

I'm working with the Amphenol ZTP-101T thermopile to get IR temperature measurements and I'm confused since the thermopile voltage seems to range between -1 and 5 mV at ambient temperature of 25C (...
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124 views

Can you connect multiple photodiodes in parallel and treat it as one?

Im working on an IR sensor based off of the Texas Instr. particle sensor (TIDA-00378). They use just one photodiode in their design. I would like to use multiple photodiodes, lined up with multiple ...
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64 views

Using 1 IR receiver for 4 LED controllers

I've purchased 4 cheap LED controllers from China for controlling 20m LED stripes. After setting the system up, I encountered the problem that at least 1 of the 4 LED controllers doesn't respond to ...
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2answers
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what is the component with the circle mark?

I am trying to build an IR sensor module for line following robots, and I used QTRX-MD-06A module as my reference. The principle and PCB photos are attached here. However, the component with a ...
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74 views

Detecting IR sensor at higher speed

I made a circuit which selects one of 4 sensors and determines if a valid data stream is present on that sensor and counts the number of times data is valid. I narrowed my problems to hardware. In ...
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3answers
79 views

Variable wavelength IR Diode?

I was thinking of building a DIY IR Spectroscope but for this, I need to find an IR diode that can do variable wavelengths. So far I have looked at Farnell and Mouser but all the diodes I have looked ...
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Choosing a camera for near-infra-red illumination analysis

Which parameters are important to look for in camera specs./data-sheets if it will be used for irradiance pattern analysis from near infra-red sources. Typical spectra range of interest is from ~700nm ...
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44 views

Precise On/Off control for IR LED

My goal is to be able to send/receive IR messages in my custom format and send messages ~10 bytes long. My message object will get serialized down to individual bits, which are transmitted by turning ...
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1answer
56 views

IR circuits: increasing sensitivity of simple analog receiver IR LED

I have the following circuit using a TSOP1738 and a simple IR receiver LED (analog): It's basically: a TSOP1738 put to my 5V uC pin, its OUT being read directly by the yellow channel of my ...
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Making LED flash from steady-state signal

I am looking to design a simple circuit that detect objects placed in a spot. So far, the circuit uses simple IR LED and photodiode to detect the object placed between them. The voltage developed in ...
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55 views

IR receiver giving constant current

simulate this circuit – Schematic created using CircuitLab This is a circuit I made with an 1838D IR receiver in order to test if a tv remote is working, but as soon as I press the button, the ...
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76 views

How to emit infrared radiation online without configuring the monitor/hardware?

I wish to make a video streaming application where infrared radiations are emitted out of the display so that if someone tries to record the video through a camera, all they see is a white light and ...
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1answer
56 views

How to reduce ADC noise through PCB routing?

I am routing a PCB board with some through hole IR emitters and transistors and I am trying to figure out placement of ICs/Op-Amps, as well as capacitor placement and route placements to reduce the ...
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1answer
112 views

How to measure the angle of a rope on a moving airplane?

I've got a simple rc plane which I want to fly on a tether. The tether is attached to the bottom of the plane like this: I now want to know what the orientation of the rope on the bottom of the plane ...
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3answers
107 views

Can a series resistor be used to limit the power consumption of a phototransistor?

I’m hoping to use several QRD1113 IR proximity sensors in a device, and they work well but have higher power consumption than I would like. I’ve tested many other ones, but I haven’t found another ...
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How to tell how sensitive a photodiode is?

I am looking to buy some new photodiodes for a project. Currently, I have been using expensive photodiodes with a picosecond level rise and fall time and a very small area to pick up light. The ...
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1answer
74 views

IR control with Darlington Transistor ULN2003A

I need a simple circuit to control a IR device. I'm quite a newbie with electronics so I would like to know if this circuit is correct because seems is not working. These are the datasheets of IR ...
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1answer
79 views

Stabilizing IR Emitter/Receiver circuits

Need some help making these IR Emitter/Receiver circuits, and their power, more stable. Building a large, 8’ x 10’ LED art installation (in progress details included). LED Butterflies in a grove of ...
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Near-me area network embedded emitters with a Raspberry Pi server receiver

I am making a toy for 4-year old children with 10-20 pieces in wood, as in this picture with four wooden boards with names: The goal is that each wooden board triggers a sound, such as "Hello" or "...
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1answer
33 views

Powering 4 modulated IR LEDs through transistor

I've done some research but can't seem to find an answer to my specific problem. I'm using an Arduino as a beam-break sensor. In order to do that it modulates the IR LED at 38kHz by code and listens ...
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1answer
48 views

What is the receiver component in Snap Circuits part U24 (Infrared Receiver)?

I'm trying to find a datasheet for the receiver component in Snap Circuits part U24, which is an infrared light detector/receiver. It looks exactly like a TSOP382 sensor (picture below) but doesn't ...
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1answer
45 views

Refractive index of Infrared light through air and perspex

What will the refractive index of infrared light traveling to air and through perspex be? So n1 is air and n2 is the perspex, I am using Snell's law to prove that as thetha 1 decreases so will thetha ...
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1answer
212 views

Connecting an IR receiver to Transistor for current control

I thought I had a simple circuit ready but I need help finishing it off. I’m using an IR receiver, transistor and a matrix of four 3MM LEDs. Want the LEDs to turn ON only when IR is detected. Using ...
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How do universal IR remote “codes” work?

It is easy to find this kind of reference when searching for IR protocols and codes for specific equipment. The actual IR transmission contains far more data than these small codes can hold. What ...
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48 views

The wavelength region of the IR sensor

I was reading an article that explains the Infrared sensor until I came to the wavelength region's section, which has been mentioned as the following: The infrared waves typically have wavelengths ...
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2answers
126 views

Distance of IR radiation [closed]

I have recently been looking at IR LEDs but having trouble in terms of finding the distance (in meters, cm or mm) the IR radiation travels through a medium such as air using the below diagram. Can ...
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2answers
145 views

What is the best way to track IR led?

I want to build an interactive whiteboard which uses an infrared ped. I want to use a camera to track IR position on the projection screen. I plan to keep the camera a little further away from the ...
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3answers
195 views

Are IR emitter frequencies adjustable? Can modulation of the emitter variate material absorption properties?

A common LED emitter, Gallium Arsenide, apparently has a wavelength of about 760 nm. Then on the receiving end, there is a filtering circuit to eliminate ambient IR and to demodulate the message. Can ...
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2answers
40 views

Capturing and replicating IR signals, how to tell frequencies?

I want to capture and replicate IR signals of various electronics. There are various guides out there. However, I realize that there are various carrier frequencies, which I dont see discussed. How ...
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1answer
97 views

Why we can't copy car remote patterns?

I have a set top box remote that I can use to control set top box as well as TV by using the set button on my stb remote.That remote can copy any remote IR pattern but when I tried it on a car remote ...
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1answer
90 views

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 ...
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5answers
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Infrared LED and Photodiodes

I am currently working on a project that uses an IR LED and a photodiode in a proximity sensor configuration (shown below). My question is, I have read some sites that state that your human body ...
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1answer
34 views

Infrared diodes illuminator scope

Can anyone tell me if there are certain specific criteria that states whether an infrared led can be used as an illuminator particularly the ones they use on hunting scopes. Would a tsal6100 for ...
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1answer
114 views

How to use 8 IR recievers that when one of them sense IR turn on a LED? [closed]

I wnat to use 8 IR sensors (4 on front of vest, 2 on back and 2 on headband like lazertag vest) that when each of sensors hitted by IR, turn on a led. I don't want to use any microcontroller so a ...
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3answers
465 views

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 ...
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1answer
169 views

Reducing LED spread via pinhole

I am making an infrared break beam to detect insects, using an IR emitter LED and detector. The insects fall into a channel and then eventually cross the beam, which travels the length of the channel. ...
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2answers
226 views

High-speed Infrared UART link with photodiode

I need short-distance (about few centimeters) wireless IR UART link with 250k+ baud. I tried to use phototransistor (assume Q1 is phototransistor). Q3 is used to prevent inverting signal. simulate ...
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3answers
262 views

How fast can we measure using IR sensors

Supposing I have an repeatedly object passing through IR sensors and I am looking at the output waveform. What is the maximum frequency the output waveform can have? I think this maybe related to the ...
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1answer
34 views

SC16IS740IPW alternative - want DIP housing [closed]

I am working on Infrared receiver based on Vishay's TFBS4711 and I've added SC16IS740 Single UART with I2C-bus/SPI interface for simplyfing communication with ...
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1answer
243 views

PIC - Problem in NEC IR Decoding in PIC12F675

I'm using PIC12F675 with internal OSC running @ 4MHz. I'm using MikroC Pro compiler version 6.6.2. To Decode NEC protocol, I'm not using Timer or Interrupt. I used delay command to make the code as ...
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1answer
62 views

Adapting an older schematic for use with recent components: How might this circuit need to change?

The schematic below is a bidirectional bluetooth-to-infrared serial device. Computer sends bits to device via bluetooth virtual COM port. Device re-transmits bits via 950nm IR w/ 38khz carrier ...
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1answer
158 views

Setting up a grid of IR sensors

I would like to design an nxn IR long range break beam sensors and place them on a table with receiver at one side and transmitter over the other Length of the table is 155 cm and width is about 140 ...