5 VL53L1X sensor and algorithm configuration
It is sufficient to set the two FoVs by dividing the 16*16 SPAD array of the VL53L1X sensor into two sub N*16
arrays. For example, N can be chosen within the interval [4, 8]. This means that it is not necessary to use the
same SPADs for front and back ranging. Alternatively enabling 7*16 SPADs is sufficient to see a person in the
two zones at the same time when this person stands directly under the sensor, in the middle of the two FoVs. It is
recommended to configure the sensor to range alternatively on the two zones every 20 ms.
Figure 6. Example of configuration of the SPAD array
The figure below shows the captured distances from two zones, where the VL53L1X is set at 2600 mm from the
floor. The black arrows correspond to the times when a person was detected entering or exiting the area being
tracked. Three crossings are visible. The first two arrows correspond to two entries and the last one corresponds
to an exit. The red and blue dots are distances measured by the sensor from the front and back zones.
Figure 7. Example of captured distances
UM2600
VL53L1X sensor and algorithm configuration
UM2600 - Rev 2
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