OPT3001: How to apply calibration data

Hi Mike,

This is shown in equation 5 in your srceenshot. You can see there is a division by 7.3% or equivalently you can multiply by reciprocal. So it is a multiplication factor not an addition. This should be performed on the MCU or equivalent.

Best,

Alex 

Hi Alex,

According to the equation 5 in my screenshot, we already calibrate OPT3001.

But I don't know how to use this compensated  measurement value?

Thanks!!

Best Regards,

Mike

Hi Alex,

According to the equation 5 in my screenshot, we already calibrate OPT3001.

But I don't know how to use this compensated  measurement value?

Thanks!!

Best Regards,

Mike

Hi Mike,

OPT without glass will give the correct lux reading. OPT with dark glass will read a lower value. After applying compensation, the compensated value is equal to the correct lux reading so you can use it as the correct lux reading in your code.

Best,

Alex

Hi Alex,

Thank you for your reply. I  have example as below:

We assume to use 1000 lux fluorescent light and OPT read 50 lux with dark glass.Effective transmission is 5% (50/1000) with dark glass.

Base on assumption, if OPT read 45 lux uncompensated value with dark glass , we can get 900 lux compensated value (45/5%).

So OPT have 100 deviation, it must be equal to 1000 lux.

Finally we can get new equation

compensated value = uncompensated value / 5% (effective transmission)* 1.111 (50/45) (deviation). Right?? 

Thanks!!

BR,

Mike