The problem with increasing the FoV is that you are spreading the light, and there is only so much of it. So what you end up doing is reducing the distance at which the sensor can range.
There are 3 areas customers wish we could improve. These are 1) distance at which we can range, 2) the Field of View, and 3) the power consumption.
Unfortunately, enlarging either of the first two, increases the power consumption.
We are working on a wider FoV, but as the power is fixed, the distance is going to have to go down.
So to your problem.
If you place the sensors 45 degrees to each other, 4 of them will cover the a 180degree swath by 45 degrees.
To cover an entire hemisphere would take a lot.
I had one researcher use 9 of them. But using 3 sensors to cover the 180 degees would leave some gaps in the coverage.
Luckly he was looking for people moving and it's difficult to move around and stay in those gaps.
You can play around with a looking for a configuration. One does not need to see an entire body to know someone is there.
And that increases the effective FoV somewhat.
And leaving a bit of a gap in your coverage does solve any interferrence problems you might have if the sensors overlap.
The other thing to consider is the bandwidth. Each collect can generate 2000 bytes of data if you turn on all the options. And with as many as 9 sensors and 10X per second thats a lot of data.
You are going to need multiple I2C busses.
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