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Topic: Is OPT101 valid replacement for TSL237? (Read 2998 times) previous topic - next topic


Oct 19, 2019, 01:16 pm Last Edit: Oct 19, 2019, 01:19 pm by Mimseey Reason: Forgot picture attachment
Could I use this sensor instead of TSL 237 light to frequency converter? I need to use it to measure absorbance values of aqueous sample. Could somebody explain do both of these sensors work on same principles?


Oct 20, 2019, 02:34 pm Last Edit: Oct 20, 2019, 07:01 pm by 6v6gt
Well, these devices both measure light intensity:

OPT101: http://www.ti.com/lit/ds/symlink/opt101.pdf

TSL237: https://ams.com/tsl237

The difference lies mainly in how they present the light intensity at the output.
The OPT 101 delivers a voltage which increases linearly with intensity.
The TSL237 delivers a frequency (Square wave 50% duty cycle) proportional to the light intensity.

You can work with both using an arduino. The OPT 101 you can read maybe with a voltage divider direct by an analog pin. The TSL237 is a bit more complicated because you have to write code to measure the signal frequency (up to 1Mz which could be around the limit without simple additional hardware such as a frequency divider chip)


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