Tagged Questions

1
vote
0answers
449 views

Arduino IR Transmitter & Receiver w/ LEDs Flickering Issue (What's wrong with this circuit?)

I have an Arduino Uno connected to two IR transmitters and respective receivers. Basically, when one of the receivers detects a beam break, I have a strand of LEDs display a pattern. This all works in ...
0
votes
3answers
116 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 ...
1
vote
0answers
126 views

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. ...
-3
votes
1answer
185 views

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 ...
2
votes
4answers
279 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 ...
0
votes
2answers
206 views

IR LED (VSMY7850x01) 850nm to 750nm

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 ...
1
vote
1answer
223 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 ...
5
votes
3answers
1k 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 ...
2
votes
2answers
1k views

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 ...
4
votes
3answers
970 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 ...
2
votes
3answers
854 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 ...
0
votes
2answers
277 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 ...
5
votes
2answers
175 views

Roomba - IR LEDs

I was wondering if it was possible to create a DIY virtual wall for the iRobot roomba. Can anyone explain how I'd go about figuring out how this works?
2
votes
3answers
321 views

Technology for precise distance measure?

I want to create a system that's able to scan the environment around him and create a depth image of what's around it, like this image, where the color lightness is inversly proportional to the object ...
1
vote
4answers
252 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 ...
1
vote
2answers
532 views

IR Led Strobe - Arduino

I need to modify the schematic below to accommodate for the change from 6 5mm IR Leds to a single 5w LED star. Previous 5mm LEDs High output infrared LED 5mm 1.2VDC 100mA 940nm ...
4
votes
1answer
921 views

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 ...
4
votes
3answers
2k views

Cheap effective proximity sensors for detecting people?

I'm building a small device that will be mounted on the ceiling (along with many other identical ones), facing downwards. I'd like to detect when someone walks underneath it. Due to the constraints of ...
1
vote
3answers
505 views

Choosing The Right IR Emitter for a Photodiode

I am working with the following IR photodiode http://www.mouser.com/catalog/specsheets/bpv22nf.pdf However, I am having some trouble figuring out what sort of IR emitter I can use with this. I am ...
2
votes
4answers
1k views

Using 38 KHz IR receivers to measure distance

Can I somehow use Vishay's TSOP series IR receivers and IR LEDs to measure the distance from an object? Has anyone done that before or has any idea how one could do it(clever programming or circuitry, ...
11
votes
6answers
370 views

Keeping those IR LEDs

For all the other stupid things I often do, I've found ways to boobytrap myself. For example keeping my wallet on the floor where the door opens - I can't help but stumble on it when I leave the ...
3
votes
2answers
1k views

IR LED Detector question

I need to buy some IR LED Detectors but I am having a hard time finding anything except for the 940nm. It seems that there are only three types of IR LED emitters and detectors sold. 850nm, 880nm ...