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.

Filter by
Sorted by
Tagged with
4
votes
3answers
1k views

Reverse-engineering IR check bits/CRC

I'm trying to build a simple Arduino-based IR remote control for a cheap toy IR-controlled helicopter (same as this one - it's called "Diamond Gyro" or "Diamond Force"). I've decoded the IR protocol ...
4
votes
3answers
4k views

IR to audio converter (frequency and level)?

What kind of IR detector and converter circuit could be used to down-convert an IR remote signal (in the neighborhood of 35 to 45 kHz) into audio frequency signals (0.1-20 kHz) of the appropriate ...
4
votes
2answers
37k views

How much voltage to give my IR LED?

I got a new IR led, emitting light at 850nm. It says 5v reverse voltage and 1.5 forward voltage. How many volts should I give it? I have DESTROYED three other IR LEDs because of giving them too ...
4
votes
1answer
541 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. ...
4
votes
2answers
6k views

How do I calculate Distance between two sensors?

How do I calculate the distance between the two light sensors (ie. Infrared LED and PhotoDiode). Actually I am designing a device based on the similar principle of GPS to control the mouse position on ...
4
votes
1answer
5k views

Can I use a 940nm laser diode for a remote control?

Most TV remotes use 940-950nm LEDs. The TV-B-Gone uses a combination of short ranged, wide output and long ranged, narrow output LEDs, to have a combination of easy mark hitting and longer range. Say ...
4
votes
1answer
12k views

Best wavelength for IR LEDs to be used with a hacked up IR camera?

So, I recently saw this question and thought it looked simple enough. Instead of a webcam though i used an actual (but old, 3MP) digital camera. The camera was a bit broken anyway(always exposed with ...
4
votes
5answers
252 views

Is there a sensor for counting the number of cards in a flipping scorecard? [duplicate]

I have a stack of cards and want to know how many cards are in the stack at any given time. Any thoughts on how I might be able to do this? Would it be possible for me to put a tag on every card and ...
4
votes
3answers
2k views

Is it feasible to use fiber optics to increase the detection area of an infrared photodetector array?

I'm working with an infrared emitter/detector system based on an Osram SFH 4545 IR LED collimated through a 40mm dia, 120mm fl lens and a sensor array based on three separate sets of three Vishay TSOP ...
4
votes
1answer
2k views

PIR sensor triggered by itself when using timer, works without timer

TL;DR A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered. Without using the timer to wait the sensor works as expected. Background and setup I ...
4
votes
1answer
540 views

Sharp Infrared sensor-Filtering supply ripple

I am using Pololu's sharp infrared sensor board part# GP2Y0A60SZLF and I am trying to minimize the noise caused by the sensor on the voltage supply as much as possible. I have made a filter and ...
4
votes
1answer
1k views

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 ...
3
votes
5answers
2k views

Infrared LED and Photodiodes

I am currently working on a project that uses an IR LED and a photodiode in a proximity sensor configuration (shown below). My question is, I have read some sites that state that your human body ...
3
votes
4answers
980 views

How to tell how sensitive a photodiode is?

I am looking to buy some new photodiodes for a project. Currently, I have been using expensive photodiodes with a picosecond level rise and fall time and a very small area to pick up light. The ...
3
votes
5answers
1k views

What type of photo sensor/light combo best for detecting a falling drop of water?

I am trying to setup a rig for water drop photography. This is where you take a picture as a water drop is impacting against another object or body of water. The trick is to detect the drop as it ...
3
votes
6answers
4k views

Control a lot of IR sensors with Arduino / Build a game board tile

Is it possible to control a lot (let's assume 100) of TCRT5000 IR distance sensors with one Arduino? So just use one or a few pins but not 100? I am relativly new to the Arduino/electronics area and ...
3
votes
2answers
4k views

Beam Angle vs Viewing Angle

I am looking at the product specs for an IR light and see that it has: Beam Angle: 50 deg Viewing Angle: 25 deg What is the ...
3
votes
3answers
3k views

Understanding voltage and current of a phototransistor w/ collector resistor

I want to study the circuit of an Infrared proximity sensor, so I assembled a circuit with an infrared LED (940nm) and a phototransistor. When no current passes from the LED, obviously the ...
3
votes
2answers
11k views

Can an IR camera be used in broad daylight?

I am wondering if it is at all possible to have an IR camera that can be faithfully used in broad daylight. I have already seen this question here, but I am looking to understand if a full blown ...
3
votes
2answers
194 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 ...
3
votes
2answers
8k views

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?
3
votes
5answers
438 views

Simplest remote IR?

What I need is: when I turn on a IR led, a receiver circuit in the other side would have 5V or 0V depending on the state of the transmitter. Simple. I have a IR transmitter and a photo-diode for ...
3
votes
2answers
4k views

Hardwire rgb-led-controller instead of Infrared

I think most of you know these cheap rgb-strip-controllers with ir-remote. I try to control it via hardwired gpio from raspberry3, simply replacing the ir-receiver. from ...
3
votes
3answers
1k views

Sending audio over infrared?

I am an undergraduate and new to electronics. I wanted to know if it is possible to send audio over an infrared LED? I plan to use a 555 timer to generate PWM output with carrier at around 44 Khz to ...
3
votes
1answer
4k views

how do i connect a photodiode detecting laser?

I want to send data through a tissue using a 850nm Laser diode. I would like to know how to connect a PIN photodiode on the receiver side?
3
votes
3answers
1k views

Components for a WiFi enabled IR controller

I don't have any experience with electronics really but I do have experience in programming. I'm interested in writing a program to control my stereo, TV etc. To achieve this I'll need a piece of ...
3
votes
1answer
80 views

Help identifying modulation scheme

I'm trying to identify the following modulation scheme being used to transmit a infrared code. It looks like manchester, but there's some gaps where there's no transitions. The code being ...
3
votes
2answers
737 views

tsop348 infrared receiver

Why do they tell that • Burst length should be 10 cycles/burst or longer. After each burst which is between 10 cycles and 70 cycles a gap time of at least 14 cycles is necessary whereas I see ...
3
votes
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 ...
3
votes
2answers
2k views

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....
3
votes
3answers
580 views

How to short two nodes electronically

I am using a Phillips SAA3010 IR transmitter IC to send a modulated IR signal. The IC has two types of inputs: Z0---Z3 X0---X7 And one type of output: DR0---DR7 Each legal operation corresponds to ...
3
votes
3answers
703 views

Remote Control Design

I am want to design a remote control. All I need is the appropriate IR LED and the Receiver to use, that will yield optimal performance. i need real practical experience here. What is the best ...
3
votes
2answers
310 views

Which infrared bulb should I use with a photodiode?

I'm currently using a photodiode (found here) along with the appropriate emitter to send data between mobile robots. I'd like to the sensor to optionally be used as an ambient light sensor using a ...
3
votes
2answers
868 views

How would I make an IR beacon system

I'd like to make a beacon system for robots where the beacon will have some IR LEDs around it pulsing at some known frequency. The module that hooks up to the robot will have a few IR ...
3
votes
2answers
2k views

How do I determine eye safety limits for IR LEDs?

IR LEDs typically report wavelength and radiant intensity (mW/sr). There are many warnings abound on the internet and from other local engineers to be careful of eye damage, but I find it difficult to ...
3
votes
3answers
336 views

Please explain why this simple circuit is latching 'on', but only when a fan is attached

My son and I made a circuit using an electronics kit. It's supposed to work so that when the IR receiver receives a signal from a remote control, it turns on the motor. It does that, but I noticed ...
3
votes
2answers
3k views

How to use an audio output to generate IR frequencies

I have an idea for a project but need some help on achieving what I want to do. I want to create a device which will insert into the audio jack of my iPhone which will emit IR signals to control my ...
3
votes
2answers
417 views

IR Connector for Sharp

I bought one of these, and forgot to get the connector. http://www.sparkfun.com/commerce/categories.php?c=139 Now I need to buy a hall effect sensor and was thinking/looking at mouser, Does anyone ...
3
votes
1answer
600 views

maximizing IR range and peak current

I ordered a bunch of infrared detector diodes (aka IR diode) and infrared transmitters. luckily the detectors are blue (and don't respond to normal room light). I am planning to order a bunch of ...
3
votes
1answer
1k views

Universal IR Receiver for TV Remotes

I'm trying to build a device that is able learn a command from a TV IR Remote and recognise when this command is sent to it. I've see that the most common protocols used are NEC and Philips and that ...
3
votes
2answers
3k views

Point-to-point range measurement using an IR receiver

I am interested in using an IR receiver (as opposed to a standalone PIN photodiode or phototransistor) to measure distance/range. I thought I had found an appropriate match in Vishay's TSSP4P38 mid-...
3
votes
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 ...
3
votes
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, ...
3
votes
1answer
2k views

interface IrDA with encoder

We have a pair of IrDA and its encoder/decoder. After reading the datasheet, we still dont know how to interface IrDA with En/Decoder. Here is our current connection: When using BAUD rate 9600, we ...
3
votes
4answers
3k views

How to detect a heat emitting object in a distance from 10 - 50cm?

If I have a heat emitting object like a heater, radiator or hot cup of coffee, what sensor can I use to detect it by the fact that it is emitting heat? I have hc-sr04 sensors but they use ultrasound ...
3
votes
2answers
2k views

Astable 555 frequency problem

I'm trying to build an oscillator circuit for driving several IR LEDs at 38 kHz 50% duty cycle. The circuit layout I used is shown below.(Source link: http://www.electronics-tutorials.ws/waveforms/...
3
votes
2answers
665 views

Under water distance measurement

For a laboratory / field test, I'm looking for an easy solution to measure the soil surface elevation. The test runs a flow on a bed. When the erosion takes place the sediment concentration goes high ...
3
votes
1answer
478 views

Helicopter rotor blade system detection approaching objects

I am working on this project to detect anything that is entering the zone of RC helicopter blades (around 10cm diameter) region and stop the rotor. It needs to detect any solid object so metal or ...
3
votes
1answer
187 views

Circuit Board Design Help (Novice) [closed]

I would like to see if the project that I am currently working on is something that can be done. Any help I can get would be much appreciated. I hope I am providing enough information. I am looking ...
3
votes
1answer
223 views

Strange and contradictory AGC characteristics in datasheet

I am trying to select an IR receiver for a remote controlled unit, from this table. Here is one example, but all of the parts exhibit the same seemingly contradictory specification. Having a look ...