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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34 views

MLX90632 eeprom write problem

I am using an MLX90632 (MLX90632-S-LD-BCB-000) infrared temperature sensor to build an application which reads an object's temperature among other things. MLX90632 manual The MLX90632 comes with a ...
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48 views

Calculate spherical surface area of IR emitter

I have an IR LED emitter. It has a 20 deg. beam width. The total power radiated is 70 mW. I want to calculate the power density (mW/cm^2) at a range of 30 cm. How do I calculate exactly, the area of a ...
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77 views

Infrared LEDs with minimal RED glow

I'm trying to find a 940nm SMD infrared led with minimal red glow at night. The TSAL6400 gets close to it, but it's still not completely invisible and not SMD. I've noticed IR leds have different ...
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27 views

Replace half-duplex electrical connection with light?

The digital pins of two Arduinos are connected for half duplex communication: Now I want to connect the electrical connection with optical communication through a light pipe: Drafts for separate ...
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91 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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42 views

How to IR LED as half-duplex transceiver or just receiver?

I'm i need to capture IR signals in their raw form from IR remote to analyze them. Currently I'm doing it by connecting logic analyzer directly across led on the remote. I want to skip that step and ...
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120 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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253 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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262 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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60 views

Why does my IR receiver spit out random codes when my motor is on?

I'm learning electronics and trying to understand why my IR receiver spits out random codes when my motor is on. I have a basic setup with this: Arduino Power supply set to 5V IR sensor receiver ...
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97 views

Why does a IR Transmitter need a VCC?

I'm building a IR hub to control several LEDs stripes, and a projector in a room and noticed that my IR transmitter works even when VCC is not connected. Should I wire it in anyways? Why is it there? ...
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63 views

How to decode an IR from device [closed]

I have the Mitsubishi DA-R45P receiver, but I don not have a remote for this device. And without remote this device can not work. I see that there are universal remotes with learn function, but for ...
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134 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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29 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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28 views

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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113 views

Is it safe to directly connect an infrared led to an Arduino?

I have a KY-005 infrared transmitter connected to my Arduino Uno. But currently I can't get it to work. On this website it says that you must connect the led directly to a digital pin on the Arduino, ...
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86 views

Sharp IR Distance Sensor gives the wrong readings

I am using the SHARP GP2Y0A21YK0F IR distance sensor. According to the datasheet, the output voltage to distance graph should look as follows: I attached the sensor to a power source straight from ...
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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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562 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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Why do IR remotes influence AM radios?

When I put my IR remote near any AM radio and push any button on the remote, I can hear a sound from the radio speaker (like beeping). This phenomenon is very weird for me because the radio has no IR ...
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177 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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348 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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43 views

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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448 views

Converting an analog signal of varying maximum and minimum values to a series of pulses

I have a situation where I need to convert an analog waveform into a series of pulses. The generated signal will be coming from an IR LED/photo-transistor pair that will output a signal whose maximum ...
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104 views

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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89 views

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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86 views

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? [closed]

do infrared sensor can pass through transparent plastic and work?
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What are the relevant parameters for a reverse-biased LED light sensor?

Following this appnote (PDF) on using photodiodes, I'm connecting an IR LED as a light sensor and emitter, configured like this: To emit light, I pull PIN1 high ...
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3k views

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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96 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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3answers
70 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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60 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
206 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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102 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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75 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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82 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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39 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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62 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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35 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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77 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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53 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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47 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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171 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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17 views

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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44 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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171 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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292 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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139 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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157 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 ...