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pycom / pycom-libraries

MicroPython libraries and examples that work out of the box on Pycom's IoT modules
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Add lux calculations to the LTR-329ALS sensor class #97

Open amcewen opened 5 years ago

amcewen commented 5 years ago

The light sensor on the pySense boards reports two light values from the LTR-329ALS sensor.

Reading the datasheet for the sensor that's because there are two sensors sensitive to different wavelengths of light.

The datasheet mentions that there is a formula for calculating the lux level from those two readings. It would be good to have the lux reading available from the LTR329ALS01 class as well as the raw light readings.

amcewen commented 5 years ago

The datasheet doesn't actually include Appendix A, but i received a copy of it from LiteON when I asked them about it.

I've implemented the new method in my fork of the libraries, in https://github.com/mcqn/pycom-libraries/commit/3faed579996044865ab9ea84625852782d5cad97

Happy to submit a pull request, but at the moment I've already got PR #95 outstanding, so it looks like that would need to be accepted/rejected first?

Kriskras99 commented 4 years ago

Your implementation does not work if light_level == (0, 0), because the ratio calculation would be a division by zero (ZeroDivisionError)

amcewen commented 4 years ago

Yes, sorry I forgot to update this issue - that bug was fixed in the next commit to my fork - https://github.com/mcqn/pycom-libraries/commit/8d655f9990f1a6c642ba8844d18ccb2b20556cf8 - a few weeks later.

osmoralv commented 4 years ago

Hello @amcewen , could you share the file with the formula please?, I am working on a Light sensor using the LTR-329ALS-01 on my job and I need a reliable reference for my programming algorithm. The work will be share on github in C language and libraries for PIC mirochip microcontrollers. I really appreciate your help.

JobStokkermans commented 1 year ago

Hello @amcewen Could you share appendix A with me? I am working on the LTR-329ALS-01 as well.