A photodiode converts light to an electric current.
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1answer
33 views
Interfacing PSD [duplicate]
The PDF link shown below leads to the schematic for measuring the position of a laser beam by using Quadrant PSD. Do the outputs X and Y themselves indicate the position or are they needed to be ...
-3
votes
0answers
67 views
Information about Position Sensitive Detector [closed]
I want to know what equipment and software would be needed to use a quadrant position sensitive detector to measure the position of the laser.Below is a link regarding the datasheet of a quadrant PSD. ...
0
votes
0answers
37 views
Using ldr to power a circuit on night
I've been trying all night to use a 10k ldr to power on a circuit at night without sucess.
It's a simple circuit that uses a MAX1555 to charge a lipo battery and at night it should turn on a led ...
4
votes
1answer
53 views
How to calibrate an optical particle sensor (Mie scattering)
I have a very simple sensor that basically emits infrared light (1 micron wavelength in the infrared range). The light scatters off particles whose diameter is of the same order of magnitude as the ...
1
vote
2answers
83 views
Finding wavelength from infrared LED in a photodiode sensor
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I have a dust sensor that emits LED light, scatters the light of the material and records the light intensity via a photodiode. I know the LED will emit light in the infrared range. I want to know ...
0
votes
1answer
63 views
Low power IR detector for microcontroller wake-up
I am working on an ultra low power infrared wake-up circuit for a microcontroller (Atmel XMEGA). I have IRDA comms working but the receiver uses too much current to keep on all the time. I need to run ...
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
170 views
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
...
4
votes
1answer
127 views
Connecting phototransistors or photodiodes in series
I am designing a velocity measuring device and want to use 2 strings of 30 phototransistors in series. The strings are 15mm apart and are illuminated by separate collimated light sources. The output ...
2
votes
2answers
214 views
Calculating photodiode current based on A/W for simulation
I'd like to simulate photodiode current for a silicon photodiode, one example device the project may use has the following specifications:
Based on the above plus a guess at Rs for the moment from ...
2
votes
1answer
219 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 ...
0
votes
1answer
102 views
Low Voltage Photosensor
I'm looking for a photosensor/photo IC part (combination of photodiode, linear amplifier, Schmitt trigger and output transistor) that can be powered with 3.3V. Fairchild QSE256/257/258/259 is almost ...
4
votes
1answer
179 views
Designing a wide-range light detector circuit
I'm looking for a few hints in designing a light detector circuit.
Priorities are that the circuit is simple (both as in few parts and as in relatively easy to understand), rather cheap, and can ...
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 ...
14
votes
4answers
2k views
Does this photodiode circuit work?
Oli used this circuit
in an answer, and it pops up a lot on Google images too. But does it work? If it does a theoretical explanation will be welcome.
6
votes
3answers
293 views
How to design for a component that says “Electrical Design: DC PNP” in the datasheet?
I'm not a guy from electrical engineering and I'm having a little trouble with a small garage project that I'm working on.
I want to use a photoelectric sensor to measure distances. I'll probably ...
3
votes
1answer
2k views
How do I connect a photodiode?
I'm trying to design a circuit to measure the ambient visible light (380nm to 750nm). Accuracy isn't too important.
I've been looking at photodiodes, but I'm not sure how to connect them up.
I need ...
2
votes
2answers
200 views
What does “case” mean exactly for this three-prong photodiode?
I'm very interested in measuring the the precise amount of amperage coming out of a Si photodiode for an experiment of mine while under illumination. We use Gamry potentiostats for these measurements. ...
1
vote
2answers
236 views
LDR Component Obsolescence
The Light Dependent Resistor (LDR) that I use in MintyTime, Excelitas Tech VT93N2, has been discontinued by the manufacturer. I'm having trouble finding a comparably priced (e.g. < $0.50 @ 100+) ...
3
votes
2answers
1k 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 ...
6
votes
1answer
670 views
Reducing noise in audio circuit (optical pickup + op amp)
I am building an optical pickup using a photodiode connected to a LM741 op-amp. My circuit is similar to this one:
Except that I've added a passive high-pass filter after the output of the op-amp, ...
0
votes
2answers
731 views
Forward Bias Photodiode circuit
I have made a quick search but couldn't find anything specific around.
I need to design a rudimentary circuit for a photodiode in conductive mode. I am interested in high speed rather than ...
2
votes
3answers
305 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 ...
1
vote
4answers
319 views
Characterizing Photodiode's angular response
I like to make a simple experiment to characterize the angular response of a particular photodiode. (SFH206K). Current thinking is to use a flat table, use a red laser, turn off the lights, point the ...
1
vote
2answers
178 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 ...
5
votes
1answer
1k views
Measuring light levels with a photodiode and an ADC
I'm trying to use a photodiode to measure light levels via an ADC on an ATMega168. I've got the microcontroller code working properly (measuring values on a pin and reporting it as an led brightness) ...
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 ...
