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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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74 views

Photodiode showing triangle waves instead of square? (re: need op amp?)

I'm trying to visualize an infrared signal using a IR receiver diode but my oscilloscope is showing triangle waves instead of square for the carrier frequency: One of the guys at EEVblog said I need ...
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1answer
33 views

Controlling Mosfet with ATTiny85 and IR Reflective Sensor

My plan is to start a motor, then stop the motor when the gear teeth gets to 15. I will be able to tell at what position the gear is by placing an IR reflective sensor under the teeth. The sensor is a ...
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1answer
66 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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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
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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33 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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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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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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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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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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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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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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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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1answer
82 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
113 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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2answers
136 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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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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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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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
76 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
39 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
109 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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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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1answer
110 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
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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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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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
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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97 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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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 ...
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4answers
144 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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1answer
63 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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1answer
235 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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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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2answers
101 views

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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2answers
75 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
123 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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0answers
32 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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2answers
47 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
93 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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91 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
65 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
78 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 ...