About John E KVAM

John E KVAM · 2025-02-05

If your VL53L8CX gets past the 'is_alive' function but you cannot get it to run, it might be because you are running on a big-endian machine, and the ST code you downloaded assumes a little-endian machine. Try swapping your vl53l8cx_is_alive function...

John E KVAM · 2024-11-26

An anonymous customer was trying to get the best possible range accuracy with a VL53L5 sensor. His temperature range was from 25degrees C to 50 degrees. This was his plot with no temp cal. After calibrating between the ranges he got: These plots ...

John E KVAM · 2024-07-08

I heard that ST has extended the lifetime of the L0, L1 and L3. Can you tell me what the new dates are and where on the website I can find them?

John E KVAM · 2023-02-01

Customer asks me how I evaluate where the photons go.

John E KVAM · 2022-07-19

I am checking signal status also for Big obstacle it showing Distance up to 2.1 meter(210Cm) and status is 0, and for small obstacle showing distance up to 1.2 meter(120 cm) and status is zero, it is not useful in outdoor environment , and it Hangs a...

John E KVAM · 2025-03-06

1) The accuracy and the distance is a function of how many photons are returned. In order to reach the distance and accuracy numbers, we adjusted the timing budget to meet those target numbers. And the longer one ranges, the more power one consumes T...

John E KVAM · 2025-03-05

The easy thing to do here is to just buy the L1. It has the ULD you want. It is, however, more expensive. But I can tell you a secret. The L3 is an L1 with the lens removed. So you can use the L1 ULD on the L3 - if you modify the function that checks...

John E KVAM · 2025-03-04

I connect my L8 satellite board as in the enclosed document. (Sorry it's not a very good doc - just my notes.) But I did cheat a bit. Notice that LPn is jumpered to J3-1V8 and the center pin. I needed to remove the jumpers on the other side of t...

John E KVAM · 2025-03-04

SPD will track the first person into the FoV. This is because we were trying to sell it into the PC market and we assumed we were following the main user. And when 'he' left we assumed we could shut down the PC. We really did not build in a second us...

John E KVAM · 2025-03-04

I'm not exactly sure what you mean by external trigger. By default, the sensor runs as often as you specify up to 15 frames per second and you get an interrupt whenever the sensor completes. Or you can set up thresholds and interrupt on changes in di...

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VL53L8CX will not initialize correctly on big-endian machine

VL53Temperature calibration really helps the accuracy.

VL53L0, VL53L1 and VL53L3 Longevity

Where do the photons go?

Typical issues with VL53L1X, range and status

Re: Request for ULD Library Support for VL53L3CX Distance Sensor

Re: Request for ULD Library Support for VL53L3CX Distance Sensor

Re: X-NUCLEO-53L8A1 with NUCLEO-F401RE on Ubuntu

Re: VL53L7CX et VL53L8CX

Re: Need help configuring VL53L8 firmware