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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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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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40 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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43 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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104 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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57 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
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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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37 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
92 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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37 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
869 views

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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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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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
202 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
127 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
118 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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102 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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31 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
103 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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60 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
83 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 ...
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1answer
28 views

multiplex multiple photodiodes to one transimpedance amp

TIA = transimpedence I have lots of photodiodes for barrier detection, I tested one photodiode with one TIA op amp, and it was OK 1) Now I want to multiplex multiple photodiodes for my project, and ...
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Digital IR Distance Sensor - Too Sensitive

I am building a few productivity timers that will be used on an assembly line to track the pace of operators as they work. The assembly line consists of a long frame with rollers spaced every 6 inches....
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57 views

Helpful guides for a novice to build VCSEL based illuminator

I need to build a VCSEL based 850nm IR illuminator. (LEDs are not strong enough, and I need the light originating from the smallest point) Are there any good guides/schematics which could help shed ...
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1answer
98 views

reading values from an IR receiver in a laser tag gun

I'm trying to mod an existing laser tag gun adding new features. To do this I need to "piggy back" on the guns IR receiver and read values from it using a microcontroller (in my case a microbit) ...
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3answers
85 views

How can I indicate that an IR LED is functioning without detecting its emissions?

I have salvaged, non-documented, IR LEDs. Without a datasheet I do not know how much current they can handle. I have run into this before: I confirm the LED is good with by viewing it through a ...
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1answer
48 views

IR emmiter and reciever layouts for custom sensor

I'm having a hard time designing a PCB for a sensor array that need to detect if there is a small reflective object (3-20 mm section) in the way. That object can slowly rotate around a shaft. I have ...
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1answer
19 views

Asking about resistors for a FreeTrack IR clip

I have been working on a project for a freetrack IR clip to use with some of my simulators, and I had a question regarding resistor values. The guide I am using is here, and it details the use of 30 ...
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1answer
83 views

Transmitting through IRDA as if its a native serial port. Possible?

I'm currently making a lazertag project that utilizes the standard UART data format for data I/O. Before I go make up another circuit board that connects a photo-transistor that senses a laser beam ...
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1answer
93 views

Replacing obsolete photodarlington with phototransistor

I've got an old circuit design I need to replicate, function wise, to fit into an existing larger design. Logic I can usually handle, anything with transistors starts to get me lost. My strength is ...
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Arduino IR reciver module XC4427 not working

I have bougth an IR module(which uses the TSOP1838) like the one in the below image for using it with my arduino uno. It worked a while then died (I think). The problem is that the SMD that is close ...
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1answer
38 views

Modulated IR for optical transmission of encoder data (TSOP 4840)

Some background: I am a mechatronics engineer and I have just recently started my first job out of university as an electrical engineer. I feel a little out of my depth but I wasn't going to turn the ...
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72 views

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 ...
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802 views

Why IR remote waveform is a saw-tooth or am I measuring it wrong

The measurement circuit is as follows: simulate this circuit – Schematic created using CircuitLab The waveform looks like this in my measurement: Is this because I'm measuring it wrong and ...
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What resistors and capacity do I need for TSOP382 IR Sensors?

I already asked in the RasPi section because I'm using my IR sensor with one but they told me I could get more specific answers here. That's why I ask here again 😀 I'm interested in the correct way ...
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500˚C IR thermometer from available 100-380˚C parts

All Digikey and Mouser available IR temperature sensors max out at 100˚C (analog) or 380˚C (digital). Is it possible to get these parts functioning at the 500˚C range? If so, how? I need a low cost ...
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86 views

Drone Thermal Imaging solution: Power Supply Module - Design Review & Load Sharing Query

I'm designing a DIY Thermal Imaging solution for my DJI Mavic Pro drone. Whilst the full design has been included for background info, this post refers to the power supply module design. The pertinent ...
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661 views

How do I determine eye safety limits for IR LEDs?

IR LEDs typically report wavelength and radiant intensity (mW/sr). There are many warnings abound on the internet and from other local engineers to be careful of eye damage, but I find it difficult to ...
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1answer
63 views

How Do I Make sure That IR Emitter signal Reached Receiver?

I am a trying to make a TV remote with one improvement that if the receiver doesn't executes the command, my remote should be able to broadcast the signal repeatedly until executed. The problem is ...
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Am I soldering this IR sensor/emitter array properly?

So I'm following this book called Arduino Robotics (ISBN: 143023184X). I am very new to electronics in general and I'm not sure if I'm doing this right. Below is a video showing the way I soldered it ...
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Aluminium foil not blocking IR signal

I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite ...
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3answers
1k views

Is smoke sensor safe for eyes / kids? [closed]

So I was researching stuff about smoke sensors and I may be paranoid but I was wondering if they were Safe for kids and in general , I read they had infrared LEDS which I heard were very harmful for ...
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2answers
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How to measure body temprature and HBR with just one IR transmitter and receiver

I want to measure body temperature and heartbeat rate only with a IR receiver and transmitter. How could I do that? Is it an accurate method? Or I have to use IR temperature sensor for this.
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83 views

How can I predict the spread/span of a single IR beam?

I want to project an IR field across a 5 inch hole to detect if an object passes thru it like a mouse, a ball or other such object; say a 4 inch ball, how can I determine or predict the spread or span ...
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2answers
668 views

Eliminating or reducing the red glow from IR LEDs at night

tl;dr; my question is simply this: is there a way to hide a bunch of IR LEDs (for a night-camera) so they don't get such a red glow at night? Preferably not at the expense of the light output, but ...
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2answers
67 views

Adjustable brightness for IR remote signals

I'm using and Arduino, an IR Led, and a transistor to for sending RC5 signals (36khz). For the next step I need to be able to adjust the brightness of the signal, basically changing the range. The ...
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Can an IR blaster built-in to some devices damage appliances? [closed]

I once have a tablet (Samsung Galaxy Tab 3 GT-P5210) that has an IR blaster built to it. I sometimes use it to control the TV on our house if the remote is lost. Now, I don't understand that if I ...
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78 views

Infrared LED, color cover/dome interactions?

Might not be the best forum, but sort of at a loss of where else to try... I'm trying to find a cover/dome for an IR LED project that I'm working on. The only thing I've found so far is: http://www....
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377 views

Time of Flight vs. Infrared Distance Sensor

I am working on a project where I require a high-resolution distance sensor, millimeter to sub-millimeter preferred. From my experience, TOF sensors are a bit more reliable than IR distance sensors (...
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2answers
167 views

RPM measurement using interrupt

I am controlling the speed of the motor and measuring RPM using IR module. The method I used works fine (I rotated the motor manually). I am facing problems when I connect the motor to the power ...