simonfrfr

Hi,This instructable doesn't exactly do calibration any justice. So what you are going to need to do is, find the spectral efficiency curve, and multiply the values from this curve to your data. You probably will want only a few, so find your LED's wavelengths. I recommend using an RGB LED so that you can select which wavelength you are using. Then you can use a Look Up Table to be able to determine wavelength. Next, after that, you MUST model the nonlinear function for light irradiance. So if you just took your values and took the ratio, then you wouldn't get anywhere because the operation curves of the photodiodes, phototransistors and LDRs are nonlinear. Finally, I would recommend using the entire detector area to ensure you are measuring the irradiance.Just a few thoughts I had this...

Hi,This instructable doesn't exactly do calibration any justice. So what you are going to need to do is, find the spectral efficiency curve, and multiply the values from this curve to your data. You probably will want only a few, so find your LED's wavelengths. I recommend using an RGB LED so that you can select which wavelength you are using. Then you can use a Look Up Table to be able to determine wavelength. Next, after that, you MUST model the nonlinear function for light irradiance. So if you just took your values and took the ratio, then you wouldn't get anywhere because the operation curves of the photodiodes, phototransistors and LDRs are nonlinear. Finally, I would recommend using the entire detector area to ensure you are measuring the irradiance.Just a few thoughts I had this morning,Good luck!Simon

You put a Processing Sketch (A different program than Arduino) in the Arduino IDE. to download the software for that program, visit: processing.org

There is a USB to serial converter that is wired up to the UART pins of the MSP430G2553 (Then its a COM port)