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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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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
26 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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74 views

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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2answers
52 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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1answer
74 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
48 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
107 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
101 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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4answers
767 views

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
64 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
63 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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34 views

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
28 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
41 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
33 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
84 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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2answers
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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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1answer
44 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
113 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
78 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
121 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
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
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
52 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
1k 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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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
113 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
315 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
141 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
164 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
158 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
33 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
153 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
61 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
116 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
30 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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46 views

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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59 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
125 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
50 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
109 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
100 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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0answers
40 views

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
48 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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1answer
94 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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2answers
805 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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46 views

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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58 views

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 ...