bros. i m working upon 'automatic room lights ' project, assigned at university.... In which we have to switch 'on' or 'off' the lights of a room for a person...
For good linearity you want to use the photovoltaic mode. Put the diode from ground to the (-) input of a good op-amp, and ground the (+) input. Wrap a...
From what you wrote I would assume they are talking about one of those IR motion detectors used on lighting. They don't generate any IR beam of their own....
I'm going to make a beer pong table and I want to have led sensors on where the cups are suppose to go. i want it pretty simple, only 2 colors or just have the...
Well, what you need might be PIR sensor. Try this link: www.glolab.com This is a passive IR sensor. It detects the change of thermal IR radiated by our body...
I am working on a path planning mobile robot project right now and I do not know what sensor model to use. I need a sensor that will return its distance from...
... Sounds like an occupancy sensor like they sell at Lowes or Grainger [mod]: Clarification for our friends outside US. Lowes is a chain of stores selling...
You could check this link: www.astech.de/english/ldm41a_e.html They named it laser distance meter (LDM). It is just alike our lab's digital interferometer....
Hey, I got this material that can detect bipotentials i.e low frequency signals. I need to characterize this material over a range of frequencies, just to know...
Hi Hrishi, Interesting material. How does it react to a potential? From your post sounds that it shouldn't matter where the potential comes from (all other...
If you are actually going to use it to detect signals from people, you need to characterize it as medical devices do. There is a human skin impedance...
Hi We wish to do a project on Self Defense trainer kit. We will be preparing a dummy into which we would place some kind of force sensors in different parts...
Hi Shafi, I believe the best kind of sensor for this kind of application would be based on piezoelectricity. piezoelectric materials are a kind of ceramic that...
1) Microfones or piezo sensors acting as such 2) There is one resistor in form of a string, you bend the string it changes resistance. 3) Build your own...
Look at Piezo film sensors such as these http://www.imagesco.com/catalog/sensors/film.html They are cheaper and I think they would work better than monolithic...
Hello, I have a question on inductance measurement. Do anybody in this group has an experience on designing such sensor (inductive sensor). Could you...
There are several different ways of measuring inductance. They are all based on the properties of an inductor; i.e., a device which resists a change in the...
Hello Sir, My project is based on agriculture end in which I want to extract the information fome the field(soil) that is full wireless based project if you...
yes i known all these parameter are same but i want some suggestion from you about the sensors selection if you know some sensors name o ic number please tell...
Folks, Have anyone used the forward voltage of the LED to estimate LED's own temperature? Here's my application. The light from the LED is used periodically ...
Hi Nick, ... I don't have practical experience with this myself, but with diodes in general it is possible to measure the temperature by running two different...
All semiconductors, including LED's, have a temeprature coefficient that follows the square law---the voltage change will be exponentially related to the...
Hm, this idea didn't get shot down. Here's a schematic for the circuit. http://www.prolifictec.com/filehost/LED_driver_rev01.pdf I'll post measurements when...
I want some suggestion from you about the sensors selection if you know some sensors name o ic number please tell me related to agriculture field. then please...
I don't think you understand the purpose of the Ref pin (pin 5) of the AD620. That is a GROUND reference, usually set to the ground potential of the...
Hi Doug, thanks for looking at my schematic! Vout = (Vin(+) - V(-)) * G + REF. You're right - REF = +5V wouldn't work for me. At the same time, I wouldn't...
I think it might work, but I also think it would be lesser cost just using a NTC to measure LED temperature, when compared with measuring LED light spectrum....
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