Imaging (sensors)

I'm collecting 100 samples on a 200ms timing budget and reporting the average once a minute, so if it's just one sample, it's high by what you see * 100. The behavior appears sensitive to the value for sensor.setSignalRateLimit(). I have it down from 0.25 (25kcps) to 0.025 (2.5kcps) for the bulk of the graph. For the right ~10% of the graph it is set to 0.005 (5kcps) to see if that reduces the frequency of occurrence.With higher SignalRateLimit() settings, or the default value, I get more frequent and several levels of spike indicating that one or more readings are just some overflow value x.01, .02. .03 or .04, depending on whether the condition occurs 1, 2, 3,4 etc. times in 100 samples. I can deal with it at this point and have a useful system, but it's bugging me. The L0X is installed in a ~half full steel 275V oil tank with zero ambient light and it has a cover with cross talk barrier.I know that the 4CD would probably be better, and I

Dear Sir,We use VL53L1X for our application. We use a glass cover and found crosstalk problem.We try to compensate the crosstalk. There are three functions in VL53L1X ULD driver as1)VL53L1X_ERROR VL53L1X_SetXtalk(uint16_t dev, uint16_t XtalkValue);2)VL53L1X_ERROR VL53L1X_GetXtalk(uint16_t dev, uint16_t *Xtalk);3)int8_t VL53L1X_CalibrateXtalk(uint16_t dev, uint16_t TargetDistInMm, uint16_t *xtalk);Would you like to tell me how to use these functions to realize the crosstalk compensation?I would like to get information or calibration procedure steps for crosstalk compensation.Looking forward to hearing from you soon.best regardsDai Sai

I've manufactured 160 boards implementing the VL53L0CXV0DH/1. Many work as expected but some of them (approximately 50 units) give 8191 always as a result. I've noticed that these devices should be treated carefully using a recommended reflow profile. Also they are susceptible to shock damage.What could be the cause of the result being 8191, in those defective devices?thanks in advance,gaston

Hello,I am trying some settings on VL6180x for avoing "Max_Signal_To_Noise_Ratio" when ranginf under sunlight conditions.I have tried to disable DMAX (#define DEF_DMAX_ENABLE     0), but still I get the MAX snr errror.I have been trying to set other limit to SNR, Which I managed to do it, But no succes when ranging at sunlight.I do not need high accuracy.Regards, Ramon.

Hi.Regarding the VL53L7CX, I downloaded STSW-IMG036 (API Source) from the product page and tried running the Nucleo board and sensor using the example project included there. However, the default sensor operation setting in the code is 16(4×4) zones, but I don’t know exactly how to change it to 64(8×8) zones.In the user manualThey say it can be changed in vl53l7cx_set_resolution(), but there is no detailed explanation, so it is currently not possible to modify it. It may be because I don't know C language well, but please help me with a detailed explanation.STSW-IMG036https://www.st.com/en/embedded-software/stsw-img036.html

Hi ! I'm using the VL53L4CD sensor's example with the Nucleo-L432KC.A first problem I solved was that the VL53L4CD didn't have the adress 0x52 as in the documentation, but 0x29 (this problem has already mentioned in a topic).My current problem is that the following code return a good status but a wrong id :'''/* (Optional) Check if there is a VL53L4CD sensor connected */status = VL53L4CD_GetSensorId(dev, &sensor_id);if(status || (sensor_id != 0xEBAA)){printf("VL53L4CD not detected at requested address\n");printf("Sensor ID :

There is an explanation about Zone mapping in the document as follows ： The area number in the above figure is consistent with the example VL53L5CX_ How do the return results in VL53L5CX_SimpleRanging ?In VL53L5CX_SimpleRanging ，There is the following code：(long)Result->ZoneResult[j + k].Distance[l],I printed the output of [j + k]（Taking 4 * 4 as an example）：3 2 1 0  7 6 5 4 11 10 9 8 15 14 13 12 Is this value of [j + k] the corresponding area number？

Hi @John E KVAM and @Anne BIGOT I'm attempting to mimic the ideal operation of the VL53L8CX in simulation. I've traced out 64 rays from the sensor within the the 45x45 degrees FOV as shown. Consider the top row (underlined in black) the rays are drawn at a vertical angle of 19.6875 and a horizontal angle of [-19.6875, -14.0625, -8.4375, -2.8125, 2.8125, 8.4375, 14.0625, 19.6875] with the centre positioned at (x, y, z) = (0, 0, 0). The intersection points with the plane presented slighly drop down resulting in a curve as shown by the black line due to the plane being closer to the sensor for the smaller horizontal angles. This ensures the ray is centred in each ~5x5 pixel. Does this accuretly depict the sensor operation? Please find the picture attached.

Hi,I am working on a project where I am using an array of 16 VL53L4CX to measure both the X and Y coordinate of any object in front of my sensor array. I want my loop time to be less than 50ms, so I am using 1MHz I2c clock. Currently I'm able to read from all sensors in 33ms on average. Even though I'm using the blocking function which is VL53L4CX_WaitMeasurementDataReady(), I'm seeing a pattern of no values at times. Initially when I was not waiting for measurement I was getting around 12 proper readings and 12 no object detections. This behaviour was happening all the time so I decided to use the blocking function. This eventually helped me to correct that behaviour, but now when I read

Hi there, I am involved in a project comprising 16x VL53L4CX Sensors, we are trying to measure and track the x and y coordinates of an object in front of the sensor array. Currently, I can read from all sensors in 33ms on average. Even though I'm using the blocking function which is VL53L4CX_WaitMeasurementDataReady(), I'm seeing a pattern of no values at times.Initially, when I was not waiting for measurement I was getting around 12 proper readings and 12 no object detections. This behaviour was happening all the time so I decided to use the blocking function. This eventually helped me to correct that behaviour, but now when I read from more than one sensor, 90% of the time I get no object detection or

Hello,I am currently working with an STM32 MCU equipped with 128KB of flash memory, alongside the X-NUCLEO-53L8A1 Time-of-Flight expansion board featuring the VL53L8CX sensor. It has come to my attention that the sensor's firmware, as defined in vl53l8cx_buffers.h (here)  within its drivers, occupies a substantial 84KB of flash memory. This firmware array is written each time the sensor is initialized. I am seeking guidance on potential methods to bypass or optimize this process to conserve memory for my application. Any insights or recommendations from the STM community would be greatly appreciated.   

I am using the latest ULD driver of vl53l8cx. The sensor can work now. But when I use the function vl53l8cx_set_sharpener_percent to change the sharpener param, it does not work. There is no effection on the distance. I also used the vl53l5cx_set_sharpener_percent before, and it can work well. So, Why does the vl53l8cx sharpener param can not be set ? BR. thanks.

I downloaded the simplified driver for the VL5L5CX from https://www.st.com/en/embedded-software/stsw-img023.html#overview .Is there a version of platform.c and platform.h for the Raspbery Pi 4?

The eval board for the VL53L5 has a GUI that displays all of the zones. Is there a similar GUI for the 53L8 eval board? I don't see one listed on the Tools and Software tab for the eval board. Or is there a way to make the L5

Is it possible to control the VL53L1X ToF sensor using the stm32f407? because I am looking for the average website using the nucleo board.

Is there any way to get an overview of the 16x16 (time-integrated) SPAD array signals? I would like to see how the VCSEL spot looks on the SPAD matrix. Clearly, this information must be present on the chip itself, as it knows about its optical center. However, is it also possible to access this data via I2C somehow?

Hello,I am planning to use VL6180 sensor in my application which is going to communicate with STM32L071. I would like to ask a question since the specification for the AVDD mentioning about optimal value is 2.8V. Do I need to provide some special LDO for stabilization this voltage (ripple reduction, etc.) or I can supply VL6180 directly from step down converter as long as I keep +/-100mV tolerance on 2.8V output? STM32L071 should works well. Thank you in advance for your help and sorry if this question was already answered but I had difficulty to find it. Jacek 

Hi everybody,I have purchased SATEL-VL53L8 package containing 2 breakout boards with VL53L8 ToF ranging sensor, and I encountered a peculiar hardware issue. A breakout board has been connected to an ESP32 dev board (3.3V logic level). I have been trying to get it working using SPI bus + ULD driver. When I call the vl53l8cx_is_alive function, a sequence of 4 SPI transactions is executed in order to confirm the presence of the chip on the SPI bus. I connected the logic analyzer to observe the SPI, and on the first glance everything looks fine:However, the MCU always reads 0s on the MISO line. I h

Hello,I am interested in the ToF-Sensor VL53L8CH to get access to the histogram data. Is there any Evaluation-GUI to easily try out this sensor and to see the histogram data, similar to the GUI for the VL53L8CX (STSW-IMG041 - VL53L8CX Demo GUI)?Thanks and BR

On same Win10 PC and same NUCLEO-F401RE, STSW-IMG004, STSW-IMG008 can not. STSW-IMG024 can.Does anyone know the reason?

Greetings Team,Have a question (that may not be so quick). Currently working on a project where I need to detect a tube's length, using the VL53L0X, from ~30 to 200mm. The problem is that the inside dimensions of the tube are 20x11mm, quite tight. I've been experimenting with various 3D-printed "caps" to limit the FOV, but with limited success. So far, I've only been able to get up to 150mm. Any suggestions? Thanks!

The datasheet mentions putting the sensor into sleep by driving XSHUT low. measuring the power consumption shows that the power is consumed more when I connect XSHUT even when I drive it low by 200 microAmp. The XSHUT is normally pulled-up on the breakout board so no leakage is assumed.

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Hello! I am an undergraduate student interested in gesture recognition based on ToF ranging sensors. How to use the gesture library to train a model for the STM32CubeMX project?Is there a tutorial? If possible, could you provide the complete project code?

Hi,I am using the VL53L3CX distance sensor for a project and I am wondering if it's possible to create my own library functions. The MCU I am using is the ATmega328PB XPlained Mini from Microchip, which only has 32KB of flash memory. The API library that I downloaded is way bigger than that, so I am wondering if I can just limit the API file to just a few functions:Data_InitStartMeasurementGetMeasurementDataReadyGetMultiRangingDataClearInterruptAndStartMeasurementI am able to create my own functions to do I2C read and write (I was able to get 0xEA and 0xAA to reference register 0x010F and 0x0110 respectively). My question is how can I setup the functions to get the I2C working? Would I have to go through all the registers (and if so, what are the registers), or would it be better to use a specific setup? Are there a specific file, headers, library that I would have to use that is less than