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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35 views

Ir high power remote

I want to take the output to the ir led of a remote control and output it to a much more powerful remote control powering a powerful led. A circuit would be appreciaed The scenario is side of a ...
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44 views

Simple Issue With Ground on Circuit Connected to Raspberry Pi Zero

This circuit is my attempt to reiterate a circuit I already have working two times over. The circuit is an infrared detector, using a photodiode and two op amps to get the voltage and current to the ...
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Is there a way to measure or infer the color of a material from a distance (~2m), without using visible light?

I've recently started working on a graphics/SLAM project. We've encountered a problem that requires us to measure or infer the color / spectral reflectance (and ideally albedo) of points on objects in ...
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Optical measurement of CO2 with LED

This teardown of a personal weather station shows an LED which is apparently used for detection of carbon dioxide with an accuracy of +/-5% within 0-5000ppm: All the commercially available carbon ...
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Simple Op Amp Non-inverting Amplifier Circuit Not Working

I am only just starting to learn about circuits and electricity, so please bare with me. I am attempting to build the circuit pictured below: And this is my rendition of it: Here are the parts used:...
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68 views

do is anyway to detect Tablets Pills package is empty or not? [on hold]

do infrared sensor can pass through transparent plastic and work?
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How to fix/reduce inconsistent IR Receiver Modules performance

i am trying to copy an IR signal from a remote for a project. I noticed that the data i am recieving from my TSOP38238 is different from the what the remote is transmitting. To show my problem here is ...
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68 views

Practical issue aiming non-visible infrared light at a reflector

I built a beam breaker set-up, with the transmitter and receiver next to each other, and a reflector about two meters out. Basically, the transmitter is an IR LED and the receiver a TSOP. Between the ...
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59 views

Understanding Responsivity of an IR sensor paired with a black body IR emitter

I'm building an air quality measurement system with the following components: IR Dual Channel sensor by Pyreos Axetris IR Balck Body emitter Reading the sensor datasheet I've seen there's the ...
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6answers
172 views

Reflect IR beam off reflector instead of emitting straight to TSOP receiver

I have a working set-up to detect beam breaks using an IR LED, modulated at 36kHz, and a TSOP receiver connected to a comparator. It outputs the count via Arduino. The range is about the width of a ...
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71 views

How does a Black Body IR Emitter work?

I'm going to buy some IR sensors for gas detection measure. As soon as I need lights on specific waves length for measure specific gas, I have opted for a black body IR emitter, specifically this one ...
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1answer
81 views

Has someone tried to keep a CD at a further distance from the CD-pickup-reader?

So, I basically want to know the range of the IR light that comes from a CD reader/writer (KSS-213C). I used an IR sensor(IR Photodiode) to detect the light that comes from the pickup reader, but ...
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37 views

How to make/duplicate a NEC Infrared Transmission Protocol

what i am trying to achieve to be able to duplicate/recreate the infrared signal of my remote control using my arduino. The arduino has a already a library for this, unfortunately it doesn't seem to ...
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2answers
54 views

Build electrical characteristic for gas measurament via IR sensor

I'm building a CO2 measurement unit via Arduino and I'm the phase of choosing the sensors. I've found out this IR sensor that, thanks to an emitter with WL of 4.26um is able to output a voltage ...
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1answer
75 views

TSOP34838 noise in dark areas

I'm using a TSOP34838 IR reciever on an ATMEGA MCU, However, I see a problem in dark areas... If I put my finger in front of the receiever, it starts spewing out garbage, even worse when the room is ...
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51 views

Circuit topology name and function for PNP transistor in light barrier circuit

I have seen this rather simple circuit for end position detection of a DC motor drive mechanism. An infrared LED (V402) and a phototransistor (V401) are used as a light barrier. Can someone give me a ...
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37 views

IR Sensor Replacement

I am currently designing a circuit, where output is switched on and off as obstacle passes IR (Infrared) beam, produced by IR LED and received by IR sensor (IR photo-transistor). The problem is that ...
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1answer
32 views

How mount IR gas detector sensor for outdoor use

I'm in search of a Gas detector sensor for outdoor use and I've found this sensor. My only concern is how do I mount it for outdoor use as, on the datasheet, there's no information about the mounting. ...
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1answer
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How are solar spectra simulators used and are they used to test photo-diodes and image sensors?

For example here is link to a Xenon lamp solar spectra simulator Xenon lamp AAA Class Solar Simulator. Two spectra are shown in the plot given in the link, one for the AM1.5G reference an other of ...
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42 views

IR Light Transmission Delay Error

The following circuit consists of two IR (Infra-Red) LED diodes; one as light transmitter (IR1) and other as light receiver (IR2). They are spaced for approximately 4 cm, so distance is not the issue ...
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101 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
156 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 (out of 16) I will be able to tell at what position the gear is by placing an IR reflective sensor under the teeth. The ...
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1answer
71 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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31 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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34 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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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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63 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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143 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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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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1answer
547 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
78 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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40 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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87 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
115 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
138 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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47 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
45 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
44 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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71 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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77 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
36 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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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
42 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
235 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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50 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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116 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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56 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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69 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 ...