Imaging (sensors)

Several questions:1. Dimensions of smallest object that can be detected.2. Maximum Sampling rate (60Hz). Can sampling time be adjusted for multiple sensor array.3. Plan to use multiple sensors. What pattern should I use to place the sensors?4. Can interrupt be generated when object is first detected?5. Any other advice would be appreciated, such as best part to use.

HI,I am using ULD API function VL53L1X_CalibrateOffset() and VL53L1X_CalibrateXtalk() to calibrate the sensor and then I store the parameters in EEprom and everything works fine: with VL53L1X_GetResult() I can see the distance of the object and when it moves away, the status returns "2 ", then I can ignore the measured distance and assume that there is no object.The problem is that when I restart the board and send the previously saved calibration parameters with VL53L1X_SetXtalk() and VL53L1X_SetOffset(), the status always returns NO ERROR and an incorrect distance.I also tried the following procedure from VL53L1X ultra lite driver with the same results.Any suggestions?Thanks.Lucio 

Hi,I have a VL53L8CX Sensor on a Satel-VL53L8 board that I am controlling with a custom microcontrollerboard that has an ESP32-S2 chip. I want the microcontroller to sleep until the sensor triggers the Int Pin, based on a threshold that I configure in advance. My knowledge of configuring thresholds goes as far as the provided example of the VL53L8CX arduino library (here). I havent really found a documentation for configuring interrupts.As far as I understand the Int Pin trigger has to be a falling edge. However I think the sleep method of the ESP does not provide a falling edge trigger for waking up (see). Only triggers on low/high level are allowed.Therefor my question is, if it is possible, to adjust what kind of trigger the Int Pin sends? And where can I find more documentation about thresholds and interrupts of the VL53L8CX? (Sorry, if I overlooked it)

Used sensor: VL53L1XApplication: TOF sensor is on bottom of a liquid filled container to measure the fill level. The light of the TOF-sensor is reflected on:1) Liquid surface (water to air, oil to air)2) Container roof surfaceIs it possible to mask out one of the reflective surfaces by limit the accepted distance for the measurement (or better: time of flight) to an expected range?E.g: The red light in the sketch will have a longer 'travel time' as the magenta light because the time to travel trough the air volume is added. If I could mask the sensor to 'see' only times below/above a given limit, I could mask out one of the reflective surfaces. 

I am trying to use the VL53L5CX with Zephyr. The read and write functions of the platform files seem to work well, but when running an example and attempting to initialize the sensor, when I reach the point of resetting the MCU, I receive a 255 from register 0x07, which stores the value in go2_status1. According to the UDL documentation, this is a timeout or I2C error, but I don't know what could be causing it. The I2C address of the device is correctly configured, and I am unsure about the cause of the timeout. Any ideas? Thank you very much.

I need to find out what data does xtalk buffer provide to sensor. I know what some parts of it mean, but I need to know what is the meaning of all parts. Is there any documentation about it?

Hello All,in the function VL53L0X_PerformSingleHistogramMeasurement from api library it is said that the code isn't implemented yet. Is there a way to get histogram measurements using this chip ? otherwise which chip should I choose to get histogram data ? Thank you

we have a toys company we think to use the VL53LDK can be used for toys for 6+ ?

Hello ST community, I am currently working on a project using the VL53L1X sensor with Arduino, and I am seeking guidance on dynamically changing the measurement mode and Time Budget (TB) within the VOID LOOP of my Arduino sketch. Specifically, I would like to know: Is there a way to dynamically switch between measurement modes (e.g., short, medium, long) during the execution of the program? How can I adjust the Time Budget (TB) for the VL53L1X sensor within the VOID LOOP to accommodate different measurement scenarios? Any code snippets, examples, or insights on how to achieve this dynamic configuration within the loop would be immensely helpful. Thank you for your assistance.

I communicate with a VL53L1X-SATEL over I2C from a PSoC 5LP as I2C-master. The sensor as I2C-slave acknowledes commands as expected, but each register I try to read returns 0x00. I tried a for loop to read every register from 0 counting up, but the sensor always return 0x00. What could be a reason for such a behaviour? Please see the scope view of a read sequence to register 0x83.      

I am renewing this conversation because I had added this concern to a conversation with the same subject that was marked as solved. Originally posted by @MBela.3 .I have not received a response. However, it is very important to me not only for my application with the VL53L5CX but for every forum member interested in these sensors.UM2884-Rev 3, chapter 5.5 Results interpretation, shows in table 4 (list of available target status) a short description of the target status 0 to 13 and 255.Do you have any additional information regarding target status codes? I am currently working with a fixture consisting of 3 VL53L5CX sensors at 8x8 resolution and a 15Hz sampling rate. We have a substantial amount of data, and we are encountering many target status codes that differ from the ideal code 5, with this deviation occurring at a rate of 80% under various real-world working conditions.I have the feeling that we might be missing out on valuable measurements due to these target status co

Hi guys, I'm using vl53l7cx without cover glass.I use the Example_1_ranging_basic in VL53LMZ_ULD_API driver, but i alway receive the result with target_status 6 and the  result's distance_mm seem not correct.Eg i put an target about 300mm in front of the sensor and get result as below in resolution 4x4:1168-6, 1348-6, 1302-6, 1243-61213-6, 1371-6, 1330-6, 1249-61240-6, 1381-6, 1332-6, 1253-61215-6, 1360-6, 1317-6, 1248-6So i wonder if i miss any config to get the correct ranging result?Thanks.

In VL53L5CXV0GC Typical application schematic, The pin RSVD6 must connect a 47 kΩ pullup resistor to IOVDD. If I keep this pin as floating, what will happen? Will power consumption increase? Or is the detection inaccurate?Thany you. 

Hi, I have two VL53L5CX and use glass to cover them. We can call them A&B.To A, I use the VL53L5CX_XTalkCalibration   function after init. To B, I do nothing.But result of both are close. Does it mean I can cover the glass without calibration?@John E KVAM, @Anne BIGOT,

Hi,I am testing a VL53L4CD sensor for a measurement application. I am using the example code from the API to test out the sensor and I'm having an issue with the minimum distance of the sensor. It will not report a measurement range less than 70mm and when the target is closer than 70mm it reports range status 3. The API documentation says that range status error 3 means that the distance is below the detection threshold but has no other information about the error. I have tried changing the detection threshold to 0 with the API function (VL53L4CD_SetDetectionThresholds) but it had no effect on this error. I don't see any other information in the API manual that appears relevant, but this API doesn't seem to have as much documentation as the APIs for other sensors (I have used the VL6180X a little bit as well, with no issue). Any help with this is much appreciated.

Hi, I was wondering if there was additionaly theory avaliable about the operation of the VL53L5CX TOF sensor? I've already read the datasheets and applications notes. I'm particulalry interested in how the SPAD array identifies the transmitted light pulse? Does this work off the prinicple of lambertian relfection? Also how does the sensor account for the the offset between the FoV of the transmitter and receiver? Would you be able to supply sources where I could read into this theory or is this a company secret? @John E KVAM, @Anne BIGOT, Just mentioned these two names as they seem the most active in response to VL53L5CX quieres.   Kind regards, David   

Hello all,We are currently considering using the VL53L4CD and other ToF / FlightSense products (e.g. the VL6180X) for close-proximity applications.Could you confirm or otherwise that the system field of view of the VL53L4CD - and other sensors based on the same technology and having similar emitter-receiver configurations - is the area of the SPAD receiver's field of view (FoV) that overlaps the VCSEL emitter's field of illumination (FoI), on the target's surface? (red area in picture attached)We have gone through the documentation available on https://www.st.com/en/imaging-and-photonics-solutions/vl53l4cd.html, especially the datasheet and application note AN5894, however we have not found this detail documented.Confirming this would lead to understanding better the spatial resolution capabilities of the sensor(s).We have created some renders to accompany this case and und thus help you understand better what we are asking about. Please refer to the pictures attached.Thanks for your t

I'm using the VL35L0X.ino demo code on an Arduino UNO and a clone VL53L0X sensor. I very carefully measured the off-perpendicular distance measurements obtained from the VL53L0X and compared them to actual tape measure measurements. On average there was about 20mm difference between the two.Also, the VL53L0X gets a little flaky more than 20-30 deg off perpendicular, reporting a '20' about every 3-4 measurement, making it a bit dubious for real-time measurements unless a 5-10 pt average is taken. Granted, the measurements were being done at 1 measurment per second so I would have plenty of time to average, but...Anyone else care to weigh in on this issue?TIA,Frank

when I use VL53L5CX and get a status, then check with the table, but I still need further description than can explain STATUS means what.It's better like the picture below. Now I meet status 2, but I do not know why this happened.  

Hello, I want to ask about the maximum range of VL53L1CB, as it says in the table (as seen in attached photo) that it's up to 8m. However, in data sheet or specification just says over 400cm.1) So is the performance should be good at 8m range outdoors? 2) What does it mean 8x8, what kind of data will I receive? Thanks.

I'm trying to implement the VL53L5CX ULD v1.3.4 on an Atmel ATSAM4L. Per an Total Phase I2C analyzer, I have it almost all running correctly. It's uploading the firmware, and the firmware bytes captured by the I2C analyzer match the bytes in vl53l5cx_buffers.h. I send sensor config parameters that match those sent by an eval board, and the sensor reports those parameters back correctly (8X8, integration time 10ms, power mode 1, ranging freq 10, sharpener 14%, target order 1, ranging mode 3). But when I enter the ranging loop the calls to vl53l5cx_check_data_ready() are responded to by FE 04 CA 81. The high bit in 81 appears to be a GO2 error. I attached screenshots from the analyzer and printf() diags. Any ideas what's wrong?

Hello, i've been using a couple of VL53L4CX tof for a month with no problem so far, but recently i bought a few more and none of these work. (These new ones are the same model that the ones that worked).Analyzing with a digital osciloscope the I2C commands i saw a difference between this two.Apparently the two tofs seems to be sending without a problem the init commands, but when it tries to access this register (VL53LX_GPIO__TIO_HV_STATUS 0x0031), the one that works answers with a 0x02, meanwhile the bad one responds with a 0x03 (I attached both screenshots).This happens in the driver's function VL53LX_GetMeasurementDataReady, when it calls VL53LX_is_new_data_ready in vl53lx_wait.c (I attached also a screenshot of this function) Does anyone know why is this happening? Could it be solved by software? Or it's a hardware issue? 

Please tell me the brightness range of sunlight that VL53L5CX can be used with.

Howdy,I am working on a project that utilizes a VL53L5CX ToF Sensor, and I am looking to use the STSW-IMG035 libraries for M0+ chips in my project. In the databrief for the sensor, it refers to "an easy-to-read user manual" which I cannot seem to find anywhere on the internet. Is there a user manual for these libraries? And if so, where can I find them?Thank you

Hello,I've already used the vl53l5cx and it worked flawlessly, so I decided to try the newest one. I'm working on an esp32s3 and a satel-vl53l8 using the ULD. I completed the platform file, and it initialized the sensor without errors. But when the sensor tries to start ranging, I get an VL53L8CX_STATUS_ERROR caused by two data sizes which should be the same but aren't.//In vl53l8cx_api.c //vl53l8cx_start_ranging() if(tmp != p_dev->data_read_size) { status |= VL53L8CX_STATUS_ERROR; }I can’t figure out how to fix it. If you need any additional information, I will be pleased to answer.Thanks