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Is it something like, I require three different currents to drive these three LEDs in order to make the intensity same? I'm measuring its intensity using LUX meter. Is it accurate?
Yeah, i can understand that. But my question is, I'm driving all these three LEDs with a single current source of 20 mA and switching is done to sequentially pass the light into the sample and the transmitted light will be detected at the other end. But with 20 mA current source, each LED...
so, what is it?? im not able to understand it... can we make the intensity of the red, green and blue led as the same? if so, how? and if not, why? please explain me in simple words bcoz im not that great in understanding physics...
Hey guys, can anyone help me with in resolving this problem?
I'm using three LEDs namely Red, Green and Blue for my project. I have to drive these LEDs at a particular constant current where these three LEDs emit light at the same intensity. I tried characterizing these LEDs with a LUX meter...
Hi friends, Can anyone help me solve this problem. I'm using three LEDs in my circuit. I have to switch it one by one so that when one LED is ON, the other two has to be OFF. Right now I'm not specifying any time period for the time which the LED has to be ON for. I'm supposed to do it using...
Hey kazzam, I'm working on building a colorimeter and not calorimeter. Both are different. I don't know what you meant. But in my project, I'm trying to build a colorimeter which can measure the concentration of the substances present in a chemical solution. Mostly in analytical laboratories...
Thanks for your help. But, I just need a basic idea about it. Can you just brief your work.. I just need to know the Block diagrams that you used,then with 3 i.e., RGB colors how did you manage to get the entire absorption spectrum of it? Which kind of switching circuit that used to generate...
Thnx a lot milind... which is the microcontroller that are using? Are you working on colorimeter project? Actually, I need lots of papers to do literature survey. I tried to find but cuddun't get much papers as possible...If you have any, can you post it? Thankyou!!!
Hey guys, Can someone help me in doing this? Thankyou!!
The digipot ic that im using is MCP41010. Its an spi interface, I have to vary the gain using 8 bits, combinations of 0's and 1's. This is given to the PIC16F877A as inputs. The output from the controller are sck, si and CS (chip select)...
hey milind.a.kulkarni thnx a lot for d post.....i m doing my projct on building a colorimeter....do u hav any idea abt producing multi colors from three led's (Red, Green and blue) so that i can pass each colour in the visible region to the sample and measure its absorption....
Hey guys, I m trying to build a colorimeter. I want some ieee papers related to it for doing literature survey. can someone post the papers if you have it? I need a start for the design. I know the basic design of a colorimeter. The problem is i need to produce all the colours using three led's...
hey guys, i m really in need of help....can someone explain me wat digital potentiometer actually does..i have no idea about microcontrollers...the project that i m doing is programmable gain amplifier. The specifications given to me are
-> gain has to be varied from 10 to 100
-> cmrr of 100dB...
Hey guys, I m using a voltage comparator, LM311 in my circuit. A pull up resistor is required for the o/p of the collector to go high ryt?? so on wat basis the resistor value is decided? Is there any particular design for it? If so, can you please help me?
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