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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Realizing an flexible, but fault tolerant, infrared communication chain

The task fell on me to realize a wireless, daisy chained communication system. The communication must be wireless, esp. via infrared diodes. The end of the chain is connected to a PC (wired). The ...
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1k views

Wrist-based Pulse Oximeter

I'm quite new to EE. I'm trying to design a wrist-based Pulse Oximeter. I have looked through a lot of literature and short listed these: PhD thesis using 6 LEDs A Single-Chip Pulsoximeter Design ...
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IR Remote, use a relay to send on and off pulses

I have a little problem. I'm using the raspberry pi to send a output signal from the GPIO pins to activate / deactivate the relay. I have a IR remote, when i short the two "connectors" on (for example ...
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IR remote output signal without IR Led and TSOP

I have IR receiver module based on AVR + TSOP, it gets IR signal from remote and passes it to RF tranceiver. Now I want to make some improvements and try to connect output (IR Led pins) of IR remote ...
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Is there any circuit like “Burglar alarm ” or “Proximity dector” with a range of 100 meters

I am in search of a circuit which works with IR or RF wave with a range of 100 meter to detect proximity or burglar. I need this to detect the presence of human or animals One thing important is i ...
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1answer
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How to test if a Near Infrared Emitter and Photodiode still working?

I suspect that my NIR emitter and Photodiode are not working. Emitter http://www.thorlabs.com/thorproduct.cfm?partnumber=LED1450E Photodiode http://www.thorlabs.com/thorproduct.cfm?partnumber=FGA20 ...
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1answer
6k views

IR Arduino Transmit n Receive

I am using digital IR Receiver Module and digital IR Transmitter Module connected each with different Arduino Uno. How can I transmit data like "1234" to the receiver and display data on LCD? This is ...
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3answers
651 views

Making a flashing LED magnetic earring

I am interested in finding out if it is possible to take a simple flashing LED magnetic earring (sold as novelties all over) and either converting it or using the housing to then power an infrared LED ...
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1answer
7k views

How to choose an IR receiver?

I am working on a project that requires an IR receiver module to detect particular buttons pressed from a SONY Stereo Remote. I have a regular kind IR receiver that looks like this: The problem ...
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748 views

using the Wii Sensor bar in a project

I'd rather not destroy any of my Wii kit, so I'm wondering if anyone knows what voltage I should drive the Wii Sensor bar with if I wanted to use it as an IR transmitter for a project. If you're ...
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1answer
708 views

Arduino infrared problem with universal remote

I am playing with Arduino and Ken Shirriff's IR library. I am trying to control Sony audio receiver using codes I found on the net. Everything works OK, I am able to control the device by sending IR ...
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Is there an IR receiver with external IR diode?

I need an IR receiver that can directly be used with a microprocessor - the TSOP series from Vishay seems to fit well and there are enough tutorials and software libraries to make use of it. ...
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1answer
527 views

AIC1863: How to use this MC to detect the presense of IR transmission?

I have build simple prototype on STM32 ARM Cortex microcontroller trying to understand the usage of AIC1863 IR Preamplifier for Remote Control System (see the handmade PCB on the breadboard). MCU ...
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2answers
883 views

IR Reflectance Sensor for a Wheel Encoder - Analog or Digital?

I'm in the process of building wheel encoders for my robot and have come across 2 different IR Reflectance sensors. Analog Digital I'm trying to find out what the potential benefits or drawbacks of ...
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1answer
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Design of a system to measure the speed of a falling simulated raindrop

I would like to know if using an IR emitter and a photo-transistor would do the job. Here are the specs of the photo-transistor. Also I'm using the Arduino Uno board; any tips on how to program it ...
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Arduino beacon for IR Seeker v2 (Mindstorms NXT Sensor) - Pulse IR at 38Khz Carrier and 1200 Frequency

I hate to ask a question like this, that is kinda just like "give me the code" but seriously. I've tried reading up on it everywhere, and I just don't seem to get a thing of having both a carrier ...
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What wavelength do I need for a IR pen?

For building a wiimote whiteboard what wavelength should my IR LED be? Would a 940nm one be okay? I am planning on using this software: http://www.uweschmidt.org/wiimote-whiteboard P.S. My specs are:...
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Should I use a resistor in this scenario?

I am building a IR pen and wondering if I need a resistor for this. Here is my specifications for my IR LED: Forward Voltage: 1.2 V Forward Current 100 mA So on and so on. I am powering it with a AA ...
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1answer
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LED Array Resistor Size + Power Source [duplicate]

Possible Duplicate: Calculating resistor value and power rating for LED driving Infra Red LEDs - Voltage Advice I need to make an array of IR LEDs, just want to check what size resistors I need....
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IR Audio Receiver and Transmitter

Let me start by saying that I am a newbie on this, trying to do some hobby stuff. I am a software professional trying to interface with hardware (maybe getting into Arduino). Using this information ...
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3answers
15k views

IR rays over carrier frequency of 34Khz?

How is IR rays that have carrier frequency of ~1014 Hz generated by GaAs in remote control carried over carrier frequency of 34Khz to the sensor?
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Underwater distance measurement/Sensing

I am working on a project from University which includes a ROV. I am trying to come up with an easy way to create a Distance Sensing system, which doesn't require a lot of work. something very simple ...
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5answers
933 views

Infrared spotlight project, need x50 resistors. How many ohms what type to use?

Infrared spotlight project. I have a PCB BOARD set up for 150x 5mm IR LED 1.5-1.6 forward voltage. Forward current is 60 mA 150 LED’s are divided into 50 groups (3 LEDs each + 1 resistor) What ...
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2answers
5k views

Reading an IR signal and running one of 5 motors

Before you judge me, I'm fairly new to electronics besides the very basics, so be gentle. However, I'm quite proficient with computers at a high level; I'm decent at writing code, and have experience ...
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2answers
195 views

Why is it only one of four batteries (Li Ion) is drained?

I have a programmable TV remote control ( a Marantz I've had since 1999 or longer if it matters), it uses 4 AA batteries. I often find (at least when I use Li-Ion, non-rechargeables) that when the ...
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why could i see IR light in a camera? [closed]

Usually we are not able to see infrared rays with our naked eyes. But we could see it when we watch it through a digital camera (or mobile camera). Why it happens?
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IR Thermometer Design

I'm working on an IR contact-less thermometer. I am using Diana Friedman's paper as a general guide. I'm planning on using a circuit similar to the one presented in figure 10. I'm planning on using ...
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2answers
1k views

IR LED (VSMY7850x01) 850nm to 750nm [closed]

Currently I am using VSMY7850x01 IR LED which is 850 nm this IR LED works perfectly for my project however I want to change 750 nm for optimal quantum efficiency of my lens which is in the 750 nm, I ...
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1answer
147 views

Connect TSOP to prolifc serial

I have a prolifc USB to serial cable that I want to use to recieve infrared signals coming from a TSOP Sensor I saw it is possible to connect a classic rs232 connector with TSOP here. How can I ...
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1answer
4k views

IR-Receiver signal almost constant

I have followed the tutorial from Makezine about an Infrared heart-beat sensor, and I have essentially used the same components listed on the video (that is, the same resistors and the same IR Emitter ...
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1answer
331 views

Unexpected pulses in the output signal from IR Detector

I have a Sharp GP1UX311QS IR detector connected to a msp430 launchpad. I wrote a small bit of code to read the output signal from the detector and print the on/off times. However, without emitting any ...
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4k views

IR LED - phototransistor problem

Pardon my noobness. I'm trying to set up a simple IR LED - Phototransistor pair but am having difficulties. My setup is just as in the following link, except my resistor values are 1K. http://www....
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1answer
605 views

How to re-generate a previously saved SIRC protocol waveform?

I am trying to replicate the remote control for my Sony home theater system. I started with anaylzing the demodulated signal of power on button using a TSOP1738 IR demodulator. It looks like this: ...
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296 views

Buspirate Logic Analyzer Mode Issue

I am new to the logic analyzer mode of Bus Pirate, so to play with it i connected channel 3(MOSI) line to the output of an TSOP1708 IR decoder to see if the capture came through. However when I ...
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1answer
2k views

Sending IR signals to Robosapien using Arduino

I am trying to send commands to a Robosapien (first generation) using an IR LED hooked up to an Arduino. I have seen web pages on attaching a microcontroller directly to the toy, but what I want to do ...
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How does the Microsoft Surface table detect objects?

I saw that the Surface table (now called PixelSense) detect objects. The strange thing is that it's basically an IR screen with LCD on bottom. How does it "scan" them then? Here's a video http://www....
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Ideas to measure 2D position of an object constrained to X-Y plane

I am working on a project, and an aspect has come up where I would like to measure (track continuously) the X and Y position of an object across a 2D plane. The object is moved by a person, with the ...
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1answer
172 views

Wirelessly activate devices using light weight and low-power solution

I have several circuits which I need to turn on and off wirelessly. The rules are: They are placed inside a transparent small box (about 50x50x50 cm) The control unit\transmitter can be placed ...
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7k views

What sensors are commonly used for vehicle detection?

I want to make a vehicle detection prototype. I find there are multiple choices of sensors that can be used to detect a vehicle, such as acoustic, ultrasonic, infrared, magnetic inductive sensor. I ...
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How do I properly use Sharp GP2Y0A21YK0F sensor?

I've recently obtained Sharp GP2Y0A21YK0F IR distance sensor and I'm not sure how to make a proper circuit for output measurement, since I'm getting lots of noise. The only thing datasheet mentions is ...
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1answer
2k views

IR LEDs for illumination, as used in night-vision cameras

Being aware that IR LEDs come in various frequency-ranges, illumination intensities, sizes etc., was wondering if someone can help me identify the right type of IR LEDs, a cluster of which could ...
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2answers
3k views

Detecting absolute position

I am working on project that requires me to detect the position of a pen on a piece of normal paper. My first thought was to use 4 IR LEDs on a receiving unit set at the top of the page, and to put ...
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3answers
6k views

Any ideas to make IR LEDs identifiable during position-tracking?

Background Johnny Lee demonstrated various interesting ideas (detailed, e.g., in this video as well as this page) that take advantage of the Infrared camera from a Wii-Remote. The IR camera has ...
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2answers
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How to use this type of photodiode?

I recently purchased the photodiode here and I am a bit confused on how to implement it. The reviews are all mixed on what is what, and the voltage for each is different so I am trying to be rather ...
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3answers
7k views

Why would an IR remote circuit use one resistor/transistor pair for each LED?

I've done some reverse engineering work on the protcol for a remote that... sucks. I'm replacing it with one of my own design, but while I've improved on the interface, the range and view angle of my ...
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1answer
412 views

On/Off with IR Reciever

I want to use a radio shack 38kHz IR receiver to make basically an on/off switch. All I need to do is that when the receiver "sees" any signal from a remote is switch on a 9v supply on. I am trying to ...
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57k views

Powering LED with 9V battery

I want to take an LED and power it with a 9V battery. I just don't seem able to get the math right. Taking an average 9V battery and a 10mm LED, what kind of resistor would I need and how do I know ...
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1answer
4k views

How to demodulate an IR signal

For an Arduino project that I'm building, I'd like to read codes from an IR remote, operating at 455 kHz. There is a combined IR eye and demodulator TSOP7000 that I think would fit the bill perfectly, ...
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2answers
882 views

Good IR LED for tracking with webcam at high speed from up to 50 feet

I'm looking to do some motion tracking on a badminton shuttlecock with a hacked webcam(s) and an IR LED. I went to radioshack and got a few leds but it seems that if i don't point them right at the ...
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3answers
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Can I transfer data wirelessly to the inside of an aluminium can?

My problem is that I have to control (turn on and off) one LASER that is placed inside an aluminium can (not like soda can, but one 2 mm thick). So the question is if there's any way to do that ...

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