For "dusk to dawn" daylight measurements for balcony/terrace plants, is there a preferred GAIN and INTEGRATION TIME setting to obtain realistic values? I currently use TSL2591_GAIN_LOW and TSL2591_INTEGRATIONTIME_500MS and on an overcast day at around 10am obtain around 1800lx, which seems sort of in line with the values provided here https://en.wikipedia.org/wiki/Daylight but is that reliable?
Thanks!
TSL2591 daylight LUX
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- adafruit_support_bill
- Posts: 88141
- Joined: Sat Feb 07, 2009 10:11 am
Re: TSL2591 daylight LUX
In general for a sensor like that I aim for the lowest gain setting and integration time that will give me a reading in the middle 50% of the scale. Lower gain means less noise and mid-scale tends to avoid any non-linearity that might exist at the extremes.
If your application requires speed, you may need to increase gain to allow shorter integration times.
If your application requires speed, you may need to increase gain to allow shorter integration times.
- Systembolaget
- Posts: 344
- Joined: Wed Mar 08, 2017 1:01 pm
Re: TSL2591 daylight LUX
Cheers, speed is not an issue, so that is why I chose TSL2591_INTEGRATIONTIME_500MS (highest integration time) and TSL2591_GAIN_LOW (lowest gain). I guess that should deliver fairly reliable results.
Please be positive and constructive with your questions and comments.