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Ambient light level with vl53l8cx ?

kgb
Associate III

Hello Everyone !

I would like to know if it is possible to measure ambient light levels  either directly or indirectly , using the VL53L8CX sensor.

Thank you in advance

1 REPLY 1
John E KVAM
ST Employee

The short answer is no.

There is a filter over the receive section of the sensor that blocks out all the light except the 940nm produced by the VCSEL (laser). So ideally all we see is the light we sent out. But the sun also generates 940nm light. And this 940nm light from the sun is what we call ambient in the VL53L8 manuals.

One could I suppose get a measure of the ambient 940nm light from the sun and guess at how bright the day is. But indoor lights generate almost no 940nm now that halogen lights are a thing of the past.

At one time ST made a part (VL6180) that had an ALS embedded in it. But after a grand run of 10 years we replaced it with a better ToF sensor, and there wasn't the demand to keep the ALS. 

If you need an ALS and you want it small, consider the VD6283 from ST. It's really quite good and amazingly tiny. 

Have a look.

- john


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