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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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64 views

Using an IR diode as an emitter and receiver?

At the recent Maker Faire Berlin, I was told that LEDs can be repurposed as photo diodes. I assume the same is true in the infrared range. This sounds like a nice solution for building a transmitter. ...
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1answer
171 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
36 views

Receive and send IR signal to smartphone at low cost [closed]

A universal remote (for television, AC, microwave etc) consists of the following components: IR sensor to learn the signal codes from another remote interface which end user interacts with, usually ...
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0answers
54 views

IR camera improvement [on hold]

I am working on a project to improve the IR camera. The task initially is to process the data coming from read out integrated circuit (ROIC) on raspberry pi. Which software can I use to emulate the ...
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1answer
29 views

IR range problem after coding burst/gap rate and ratio for TSOP1236

I programmed an ATTINY13 to drive an IR led on 36kHz with this code: ...
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1answer
112 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
199 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
19 views

Relation for the current generated by a photo-diode in photo-conductive mode

If a photodiode with responsivity R is operated in photo-conductive mode with reverse bias voltage Vb and load resistance Rld what relation gives the output current from the photo-diode flowing ...
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32 views

Two (or more) 'connected' IR sensors?

I would like to use two (or more) 1838 IR sensors, to be able to read a (TV?) remote control for controlling my project. The reason I want two or more is that I want to be able to point at the device ...
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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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3answers
112 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
207 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
59 views

9 volt battery and a 10 watt IR LED [closed]

I connected a 9V battery to a 10V IR led and the brightness lasts 3 seconds before "dimming" down to a soft glow. How do I maintain the initial brightness? Do I plug in a few AA or do I buy a 30 or ...
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24 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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2answers
213 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
538 views

What part is used in this IR receiver?

I bought an IR repeater with the simple schematic: What is this receiver component? It looks almost like TSOP4838, has the same pinout, but it outputs an encoded signal and I cannot find what is it. ...
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1answer
68 views

Single transistor IR repeater

I need the IR repeater to pass IR (TV and so on) remote signal to remote devices in some box (pass the IR signal from outside the box). So, I bought a cheap IR repeater on single 2TY transistor, 4838 ...
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1answer
109 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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0answers
57 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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1answer
1k views

Measuring the angle to an object using IR sensors?

I would like to be able to use IR emitter/receivers to measure the ANGLE to an object. As far as I am aware this is how the Sharp IR distance sensors work, by using triangulation to measure the angle ...
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0answers
22 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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2answers
135 views

Connect IR Emitter (+) to IR Receiver (+)?

I have a vehicle stereo deck that has an IR receiver input (+) and a steering wheel control module that has an IR emitter LED (+/-). The steering wheel control module, "translates" (using a mapping ...
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1answer
80 views

Why use a transistor to drive an LED?

Why I should us a transistor to drive an IR LED? I see many schematics which use the following circuitry: If I connect the IR LED directly to an Arduino digital pin, it works. But with the ...
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1answer
545 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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1answer
34 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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3answers
14k views

Can I electronically trigger a PIR motion sensor?

I would like to trigger a PIR sensor using an infrared LED. Is that possible? My goal is to simulate motion in front of the PIR, when there otherwise is none. I tried using a handheld remote ...
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1answer
41 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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7answers
28k views

If Infrared not visible, why the red LEDs?

If infrared light is not visible to the human eye, why do most tv remote controls and security cameras appear to have a visible red colored LED lit when the infrared light is being emitted? Is that ...
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2answers
2k views

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 ...
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1answer
44 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
41 views

IR transmitter Frequency for Universal Remote of TV and AC [closed]

I have searched thoroughly but still confused which IR transmitter will be best for making a universal remote of TV and AC. Standard frequency is 38 kHz and others are 36, 38, 40, 42, 48 and 56 kHz. ...
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2answers
318 views

How is the Correct Surface Load of a Heating Element Determined and Verified?

A heating element should be operated below its maximum surface load (power per surface area.) For a given element, one might be tempted to say the surface load is the power given by Ohm's law divided ...
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3answers
65 views

identify infrared receiver

My CD player's infrared receiver for its remote control has failed. (The remote still works with a friend's identical player.) I'd like to buy a replacement receiver and solder it in. How do I ...
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3answers
75 views

How Much Current is Usually Used with IR Transmitting LEDs, in Remote Controls?

If you take various Remote Controls from your home, such as for a TV, Audio System, TV Box, etc, and measure the current that is supplied to the IR LED in the remote, what would be common current ...
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1answer
34 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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1answer
38 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
38 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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1answer
103 views

Driving IR led from 3.3V GPIO using 2N2222 transistor

I am using the following circuit to drive an IR led from a NodeMCU. simulate this circuit – Schematic created using CircuitLab However, im seeing the following on my scope. (Please ignore the ...
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0answers
32 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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0answers
18 views

Difficulty interpreting normalized output vs FOV plot in ZTP-115M datasheet

I am slightly unsure as to how I should interpret the normalization output vs FOV plot of the ZTP-115M datasheet (page 2) My question is 2-fold: Do IR light sources beyond some FOV angle contribute ...
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0answers
55 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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1answer
88 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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1answer
65 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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1answer
28 views

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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3answers
96 views

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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3answers
105 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
116 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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1answer
98 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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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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3answers
92 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 ...