I am reading from the analog light sensor, and I get values between 500 and 700 or so.
But, what are these values? How do I convert these to lumen or lux?
That’s a really good question.
I’ve read more on this sensor and I found out that the
light sensor's model is
datasheet can be found here:
So, by going over the datasheet, you may find some interesting bits of information. Especially on
What you need from this
datasheet is a plot between the light sensor’s
resistance and the amount of
lux - take a look in the
After you get the graph, we then need to interpret it in order to get a formula - this thing can take a lot of time.
datasheet doesn’t seem to be really informative - it’s quite hard to decipher it.
You may want to take a look on this forum - these guys are also struggling with this
sensor in particular and their solution may be worth something:
Then, I’ve looked over the
Grove Light Sensor's schematics and I saw the following:
Let’s say we find out a correlation between the
lux and the output
voltage of the
But there’s another impediment we have: it’s the
amplifier we have there. We’re not sure what are the
Again, we would need to calculate (physics involved too) in order to reach a correlation between the
lux and the
Grove Light Sensor's
output voltage. And this thing can be prone to human errors as-well.
Anyway, here’s the
The good thing about this
datasheet (which comes from
TI) is that it’s a lot more explicative.
Personally, I think you have 2 alternatives which sound a lot better:
Use a professional light sensor in order to calibrate this
Grove Light Sensor. For each reading, you would find out the ratio between the
analogReadvalue from the
The bad thing about this method is that you need to take lots of measurements (tens of them) in order to get a somewhat precise sensor - that’s because the sensor’s
resistanceisn’t proportional to the amount of
Light Sensorthat’s made for measuring the
lux- it needs to have a
Groveconnector. We currently don’t have another sensor in our catalog that suits this need, but
The following sensor is compatible with our
Here’s a link to it: https://www.seeedstudio.com/Grove-Luminance-Sensor-p-1941.html
Please let me know what decision you further want to take and if there’re any more questions, Luca, please bring them on to me.