Components, circuits, or systems that convert between electrical and optical (light) energy.
3
votes
2answers
83 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 ...
-1
votes
1answer
41 views
Optoelectronic lab involving filtering of image with white light [closed]
This is an optoelectronic lab experiment involving filtering of the stylised image of a house with white light and grating.
The objective is to filter the bars on the upstairs window and the ...
0
votes
1answer
122 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 ...
0
votes
1answer
100 views
How to implement a delay OPTOcoupler input there by the circuit remain on for the next 1 second
I have another new project , the project is simple one when a call lands to the mobile an ac machine is triggered and it turns off when the mobile ring stop , for that i have used this circuit
The ...
1
vote
2answers
137 views
Heart Rate Circuit
I am building a heart rate circuit followed the instructions in this site:
http://embedded-lab.com/blog/?p=5508
Basically, the circuit works when we place the photo detector and emitter on the ...
1
vote
1answer
114 views
How do I find a commercial LED with 1625nm wavelength?
I'm looking for a LED with an emission wavelength of 1625nm for a project, but have been unsuccessful thus far in my search. How would I go about finding a commercially available LED in this range? Is ...
1
vote
2answers
104 views
Optical sensor for picking up 15 mm² area at a distance of 1 cm and return RGB value (or similar estimate)
I need an optical sensor for picking up 15mm² area at a distance of 1 cm and return the RGB value or any similar estimate.
I am going to use a custom lens for this focus.
This is basically to read ...
2
votes
3answers
341 views
Microcontroller or arduino alternative for small cell-phone sized device?
I am doing a project in which I need to read RGB values from a color sensor TCS230 and send it to a microcontroller and use an linear equation to get glucose value from it and display it on an LCD.As ...
2
votes
2answers
137 views
Stepper motor phase
I have a question related to stepper motors.
What does the "phase" of a stepper motor mean? I mean when we say that a stepper motor is a 2 phase stepper motor or a 4 phase stepper motor, what does it ...
2
votes
2answers
1k views
Measure power supply ripple with Rigol DS1052E
I recently received (as a birthday gift) a Rigol DS1052E oscilloscope. I read about oscilloscopes but I never really used one.
So my question is:
How can I measure the ripple voltage of a floating ...
1
vote
1answer
104 views
Electrophoretic Displays
I am extremely interested in learning about electrophoretic displays. On their architecture, how they function and also would like to assemble one from the scratch for myself and see how it works (I ...
3
votes
3answers
237 views
Electro Optics vs Optoelectronics > What's the difference?
I've seen both wikipedias of Electro Optics & Optoelectronics but I'm still confused on what the difference is.
I'm currently pursuing a degree in either Physics or Electrical Engineering because ...
2
votes
1answer
225 views
Water Meter Monitoring
Working on a project where I am wanting to monitor water meter via a magnetic sensor which will detect the spinning magnetic disc. It's very similar to the project this person has accomplished:
...
0
votes
2answers
170 views
Creating an electronic switch for controlling a headset's control button
Some background information
I have an Android based phone. The headset that came with it uses a TRRS connector. We normally have a button on the headset which when pressed, would allow you to ...
2
votes
1answer
113 views
Scattering matrix Transmission Matrix lasers
I would like to ask if anyone can suggest me a good tutorial about Scattering and transmission matrices for lasers.
I am really struggling with some issues and the majority of the literature analyses ...
0
votes
1answer
217 views
Laser Turn-on delay
When switching a laser diode, the turn on delay depends strongly on the initial bias current in the off state. This affects the duty cycle when attempting to generate a square wave. It also can ...
1
vote
1answer
700 views
Current modulator for laser driver?
For a project, I like to feed a sine wave to laser, this sine wave must have a DC value of 2V and it should oscillate between 2.5 and 1.5V at 100KHz. The current required is <50mA.
What is the ...
7
votes
3answers
725 views
Using a LED to transmit data
I am curious about the possibilities offered by LEDs to transmit data over a short range (2 or 3 meters), and what maximum data transmission rate can be expected from carefully chosen, but ...
1
vote
2answers
271 views
Cheapest way to do an IR re-transmitter (IR protocol agnostic, dumb device is good enough)
Looking out for ways to retransmit IR, bi-directionally, like this:
...
0
votes
1answer
123 views
Which device amplifies the optical signal in fiber optics?
My teacher ask me one question.
How the optical signal or information was transfered in fiber optics communication?
Then i explained it and use the word optical amplifier then teacher ask me what is ...
2
votes
2answers
232 views
Laser Diode Security System
I'm thinking about making my own laser security system (think mission impossible). So I was thinking I'd use a laser diode to shine a beam across a doorway into a light dependent resistor that's on ...
4
votes
2answers
510 views
11
votes
2answers
7k views
How do I model an LED with SPICE?
What diode modifiers are used in practice to model LEDs with SPICE (Berkeley v.3f5)? These are available to me:
...
1
vote
5answers
712 views
7 Segment Display - Hiding the electronics
I'm building a basic thermometer that displays the temperature on 4 seven segment LEDs. I want to put the circuit in a box with a clear plastic lid.
I'll mount the LEDs on the PCB around the other ...
