About John E KVAM

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 · 2022-07-18

How can one adapt the WrMulti() and RdMulti() I2C functions for MCUs that have an I2C length limit? This is an oft-asked question.

John E KVAM · 2024-12-03

ST has done a lot of work in this area. Go to: STSW-IMG039 - Liquid Level Monitoring Code Example using Time-of-Flight sensors - STMicroelectronics and have a look. There is documentation and code for both the L4 and the L5 sensors. The trick is tha...

John E KVAM · 2024-12-02

There is nothing wrong with your schematic. The sensor does not depend on calibrated voltages or light intensity. These ToF chips are measuring when the photons come back and as long there are enough returning, out pops an answer. One thing to check...

John E KVAM · 2024-12-02

the best info on crosstalk is https://community.st.com/t5/mems-and-sensors/time-of-flight-cover-glass/ta-p/49259 It's short, but it references a couple longer, more in-depth documents. Give that a read and see if it explains enough for you.

John E KVAM · 2024-12-02

The 8x8 array covers a 45x45 degree FoV. So in rough terms a 5x5 degree square for each zone. And yes, depending on how far away the ceiling is you are only going to get one or two zones. The only real hardware solution to your issue is more resolu...

John E KVAM · 2024-12-02

Once you lift the LPn pin and re-configure the I2C address, you have to leave the LPn pin high. Dropping it means you have to start over. Whenever that pin comes high it will respond on the default I2C address. (The pin actually drops power to the co...

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VL53Temperature calibration really helps the accuracy.

VL53L0, VL53L1 and VL53L3 Longevity

Where do the photons go?

Typical issues with VL53L1X, range and status

I2C multi-byte read and write functions with i2C byte limit.

Re: Best ToF sensor for liquid measurement

Re: Initial accuracy of VL6180X (i.e. after reflow)

Re: VL53L1CB calibration functions

Re: Question about ToF VL53L8X resolution.

Re: VL53L8CX LPn pin ignored