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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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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560 views

PWM on phototransistor

I am pulsing the VDD with 50% duty cycle at a frequency of 188 Hz (PWM). I get some weird spikes on my output TP3. Am I missing something about phototransistors? Here is the picture of the IR circuit ...
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104 views

Are common IR LEDs harmful to the eyes?

Is it safe to look at the IR LED clusters on security cameras that are commonly available? They seem to be quite capable of lighting up a distance of 6m. What is their energy density? I'm not sure if ...
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83 views

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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40 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
49 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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2answers
273 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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1answer
231 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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1answer
194 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
145 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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97 views

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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188 views

3.5 male to IR Transmitter - Receiver [amplified] back to 3.5 female

Trying to recreate a DIY headphone with IR transmitter and receiver I already searched this is what I have found so far: 1.- http://www.instructables.com/id/DIY-Infrared-transmitter-for-iPhone-iPod/ [...
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143 views

Simple IR gate switch

Regards to all I'm totally new with electronic and I need help with some schematics. I find one circuit that fits my needs: simply instantly turn on the LEDs with press of a switch and dims them on ...
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172 views

Where do I place a decoupling capacitor when the power supply is intermittent?

I'm building a low power obstacle detector. I have an infrared LED and a IR photoresistor wired up to a BLE Nano (a tiny bluetooth IC) running off a small 3v coin battery. My code basically does this....
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1k views

IR LED power density calculation

I made the basic IR LED circuit shown to augment the existing system on a night vision security camera. No datasheet was found for the LEDs so I just measured the current to extract the power of ~0....
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98 views

Making an IR transmitter with a range of 3-4 meters

I am designing a vehicle counter in a parking facility. What I have to do is to detect if a vehicle enters the 4 meter wide entering of the parking. I was initially trying to make an IR receiver and ...
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253 views

Problems with Infrared circuit on a PCB - Is it the board or schematic?

I am using the toner transfer method to apply my circuit for 6 sets of infrared emitters and collectors connected to an RJ15 cable on a PCB for use with a Raspberry Pi B+ board (connected via IDE ...
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2k views

Datasheet for Keyes IR Transmitter (KY-005) wanted

Can someone help me find the datasheet for the Keyes IR Transmitter (KY-005)? I know how the pins work, I just need to figure out its voltage drop and how much current should go through it. Thanks! :...
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2k views

IRDA Through Audio Jack

I'd like to know if it is theoretically and/or practically possible to enable a smartphone (iOS or Android) to communicate with another device via IrDA (IrCOMM) using a simple infrared transceiver ...
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7k views

Arduino IR Transmitter & Receiver w/ LEDs Flickering Issue (What's wrong with this circuit?)

I have an Arduino Uno connected to two IR transmitters and respective receivers. Basically, when one of the receivers detects a beam break, I have a strand of LEDs display a pattern. This all works in ...
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162 views

Is this IR LED driver circuit with a transistor OK?

I am making a custom IR array board with a custom Arduino (only ATMEGA328 and necessary components.) So please tell me will this be fine or if I need to make some changes. IR LED = 940nm, continuous ...
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1answer
21 views

Building DIY TrackIR, need wiring help

I'm attempting to build a homemade head tacking unit for use in computer games using infrared LEDs for my kid. I followed one tutorial where they were wired in parallel. After doing more research, I ...
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Mid-Infrared sensor cover (not PIR)?

I came across this great little sensor (AK9750), which can detect people in 4 directions with a good range of about 2 meters. However, its spectrum sensitivity is between 5000 and 7000 nm, which is ...
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58 views

Microwaves Vs Infrared rays

Microwaves and infrared rays, both are electromagnetic waves. But microwaves easily pass through non-conducting materials, while infrared rays are blocked by such materials. Why this difference in ...
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1answer
20 views

How to properly utilize RPI 1391

I'm trying to get going with the RPI-1391 sensor but I'm obviously doing something wrong. I'm connecting it to a Raspberry Pi, where: Pins 1 and 3 are connected to Pi's ground Pin 2 is connected ...
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25 views

Infrared burst/gap rate and ratio for TSOP1236

My transmitter consists of this exact IR LED, with an 180 ohm resistor, operating at 5V, that is being pulsed by an ATTINY13 using this code: ...
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23 views

How to disable port2 interrupt when port 1 interrupt is active?

I am using MSP430G2553 with IAR. I would like to make an IR communication system which has a transmitter-receiver on both sides. When I try to send my signal, the receiver on the opposite can't ...
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1answer
42 views

Photodiode current vs. irradiance and finding upper limit current

1.) What equation could be used to calculate, or make a decent estimate of the current produced by a photo-diode from incident irradiance and its operating parameters. For example for this PIN photo-...
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1answer
116 views

IR transmission power controlling

Maybe this is a big topic, I will explain my problem. (Reworded) If you want to adjust the distance IR communication can reach, you will face this problem: transmission power adjustment. That means ...
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1answer
49 views

IR Remote with 4 buttons timer

So I was wondering how it would be possible to design an IR remote that consists of four buttons for each channel powered by a battery. How would I be able set something like this: The receiver will ...
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1answer
48 views

Determine polarity of IrED with multimeter

I have an infrared LED as part of an IR transceiver, and I want to determine its polarity. As the device is unmarked, finding its datasheet is out of the question. And, as it is infrared, seeing it ...
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1answer
37 views

2-way mini motion sensor (mirror switch)?

So a mirror switch will switch ON with 1st "swipe" and OFF on 2nd "swipe". I want to set it up in a 2-way configuration whereby if you pass switch 1 it's ON and then pass switch 2 it's OFF, then pass ...
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39 views

driver for IR led board

I'm installing a cheap IR led board like this. Do they need any kind of driver? Or just a 12V power supply switched with a relay (to power on/off) If so, is there any kind of consideration I need ...
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2answers
45 views

Restrict IR sensor field of view

I'm trying to develop a device that can detect or "watch" an infrared beacon that is freely moving side-to-side anywhere within a 180° field of view (-90° to +90°, with center/forward at 0°); i.e. the ...
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55 views

Add IR (infrared) remote control to simple audio amp?

is it possible to add some kind of a remote control receiver to a basic audio amp board that only has a manual volume knob? The IC chip in the amp board is a TDA7498. A general view of the board is in ...
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121 views

Detect Infrared beam projected onto X-Y plane. Save and display coordinates. CMOS sensor?

I'm working on a project in which an IR laser is pointed perpendicular to the surface of an X-Y plane (Think like the old game "Duck Hunt"). I don't know where the IR beam will land on the plane but ...
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58 views

Can the same IR sensor be used to measure distance and temperature?

I am trying to find a distance sensor (for obstacle avoidance) that works in really high temperature zones (~600 degree C). I also need a temperature sensor for avoiding my robot to move in certain ...
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39 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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2answers
76 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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33 views

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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93 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
78 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
35 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
65 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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236 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
135 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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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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182 views

Transistor for 38kHz IR pulse amplification

I am trying to build a timer circuit in which I will send a modulated 38kHz (almost) signal to an IR Receiver (TSOP38238 in Arduino Nano) and I want to amplify the square wave to the IR Led to ...
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1answer
94 views

Design of a proximity Sensor with Digispark MCU

I want to design a battery powered device that detects proximity (through an IR LED and a photodiode), and displays information on a small screen. As it is an autonomous device, it must be low-power. ...
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80 views

Vehicle tracking and direction processing

Im trying to find a good way for tracking vehicles. Its like counting all the vehicles (cars, motor cycle or any vehicles)through a point on the road. Also it needs to count like how many in total and ...