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Posts: 11
Registered: ‎03-11-2016
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Si1145 VIS Light & IR Light &UV Index Measurement

Hi,
      I wish to use Si1145 to measure the visible light , infrared light and Ultraviolet Index, but the result I read from Si1145 is big different to "Digital Lux Meter".
      I want to confirm the formula I used is right or not. My test environment is indoor with “Cool white” fluorescent light.

      According to the datasheet , I think the measure result should be calculate with flowing formula.2016-03-23_220214.png

2016-03-23_220430.png

2016-03-23_220614.png

 

     Is there anything problem with the formula ?

    My Calculate value is as flowing:

    VisData = 289 lux, sometimes is 246 lux,  

but the "Digital Lux Meter" measurement data is 212 lux;

   IrData = 18

   UV Index  is aways 0.

 

  I really appreciate all precious comments and suggestions ! 

 

     

 

Posts: 75
Registered: ‎02-22-2016

Re: Si1145 VIS Light & IR Light &UV Index Measurement

Hi,

 

Your formula is correct. The sensor takes VIS and IR measurements' data and estimates approximate LUX and UV values. The calculated LUX and UV results are reasonable, but it's not going to exactly match LUX meter or UV meter's reading.

 

Regards,

Tony

Posts: 11
Registered: ‎03-11-2016

Re: Si1145 VIS Light & IR Light &UV Index Measurement

     I really appreciate your patience in answering all my questions.
And I will optimize my code , make sure the result is more reliable.