Imaging (sensors)

Hi, I ran into a weird issue initializing a VL53L8CX over SPI where the firmware was seemingly failing to load correctly (the firmware checksum was wrong, and trying to read back some of the firmware from the sensor showed that it didn't match the data that was written). I found that I could get it to work if I increased the SPI frequency from 0.5 MHz to 2 MHz, and the threshold between working and not working seemed to be at around 1.1 MHz. After experimenting a little more, I observed that it didn't seem to be the SPI frequency itself that matters, but rather the time that it takes to download the firmware - for example, it will fail if I add a 300 ms delay invl53l8cx_init() just after the comment "Download FW into VL53L8CX". It seems like the firmware download needs to finish within about 600-650 ms or it will fail. This isn't a problem when using the VL53L8CX with I2C - it works even with 100 kHz, which takes much, much longer than 600 ms. Can anyone confirm whether

Do you have an example of SPI communication with VL53L8CX ?

HelloI have a question about distance measuring with VL53L0:Execution of initialization functions seem to work (all returning VL53L0X_ERROR_NONE):if ( VL53L0X_DataInit( Dev ) != VL53L0X_ERROR_NONE ) return false;if ( VL53L0X_StaticInit( Dev ) != VL53L0X_ERROR_NONE ) return false;uint32_t refSpadCount;uint8_t isApertureSpads;if ( VL53L0X_PerformRefSpadManagement( Dev, &refSpadCount, &isApertureSpads ) != VL53L0X_ERROR_NONE ) return false;uint8_t VhvSettings;uint8_t PhaseCal;if ( VL53L0X_PerformRefCalibration( Dev, &VhvSettings, &PhaseCal ) != VL53L0X_ERROR_NONE ) return false;If ( VL53L0X_SetDeviceMode( Dev, VL53L0X_DEVICEMODE_SINGLE_RANGING ) != VL53L0X_ERROR_NONE ) return false;if ( VL53L0X_SetLimitCheckEnable( Dev, VL53L0X_CHECKENABLE_SIGMA_FINAL_RANGE, 1 ) !=  VL53L0X_ERROR_NONE ) return false;if ( VL53L0X_SetLimitCheckEnable( Dev, VL53L0X_CHECKENABLE_SIGNAL_RATE_FINAL_RANGE, 1 ) != VL53L0X_ERROR_NONE ) return false;FixPoint1616_t signalLimit;FixPoint1616_t sigm

When performing I2C communication from the MCPU on a board that independently implements VL53L8, there is no ACK from VL53L8 at the first address transmission, resulting in an error. If you check the LPn, SCL, and SDA signals, you can see the start condition, SCL and SDA at address 0x52 have clean waveforms, but at the 9th clock, confirm that SDA remains High and there is no ACK from VL53L8. Did. The voltage level of the above signals is 5V for LPn and 1.8V for SCL and SDA. Do you know why ACK is not returned from VL53L8? Is it possible for the I2C address of VL53L8CX to be other than 0x52?

Hello,I'm using the VL53L1CB sensor to detect objects from a long distance. Unfortunately, I can't always guarantee ideal working conditions. Sometimes, there are objects (structural elements) within the detection area that cannot be removed. Their presence causes 'noise'. Is it possible to perform some calibration that would cause all objects seen by the sensor during calibration to be ignored and considered as background?

Hello,I am trying to calculate the x,y,z coordinates of each points of the VL53L5CX sensor to determine the angle error between a surface and the plan of the sensor.I have two problem with my system :- the resulted error is not symmetrical with one rotation side or with the other,- and the resulted error is very depending on the material I chose.Here is a graphic of the mean angle error with 2 surfaces (wood and black metal) repeated with 3 differents VL53L5CX (I took 50 measures each 5° degrees).So I am wondering if my calculation of the coordinates x,y,z of each points of the VL53L5CX is right, and if I didn't forget some details. I'm almost sure that the plan calculation is right.So here is the way I calculated the coordinates:The VL53LCX give us 16points, and the returned value of each distance is the adjacent side of the FoV as said in this page of the forum : https://community.st.com/t5/imaging-sensors/vl53l5cx-distances-don-t-match-theory-what-am-i-missing/td-p/82657.We know tha

Hello Everyone, I'm working on a project where I need to use the VL6180X sensor with the PIC18F. However, I could not adapt the set register and get register functions in Arduino to the PIC using CCS C. All I want from the experts here is to adapt the two functions I shared below to work in the CCS C program in accordance with PIC. uint8_t VL6180x::VL6180x_getRegister(uint16_t registerAddr) { uint8_t data; Wire.beginTransmission(_i2caddress); // Address set on class instantiation Wire.write((registerAddr >> 8) & 0xFF); // MSB of register address Wire.write(registerAddr & 0xFF); // LSB of register address Wire.endTransmission(false); // Send address and register address bytes Wire.requestFrom(_i2caddress, 1); data = Wire.read(); // Read Data from selected register return data; } void VL6180x::VL6180x_setRegister(uint16_t registerAddr, uint8_t data) { Wire.beginTransmission(_i2caddress); // Address set on class instantiation Wire.write((registerAddr >> 8)

I woulke to know the dead time of VL53L8CH to know the max value of one bin, but there is no information in the datasheet. Besides, currently I am using  the example in VL53LMZ_MassMarket_ULD of cubeide to get the histogram, I want to know if the number of the bin represent the number of the photons or does it need to multiply with some special scale value?

Hello!   I am working on a project where I would like to be able to detect which type of sensor I have connected (via I2C). For example, I am currentky planning on using a VL53L0x, but would like to be able to detect on boot if I am still using the VL53L0x or have switched to a VL53L1Cx, etc. I recognize that the initialization and read processes are a bit different, and would simply set a flag so I know which to call. Basically, I would like to be able to swap sensors in the field and be able to detect those changes. Is there any sort of ID Register? Is there a different way? I looked through the VL53L0x data sheet but did not find any mention of anything like this. Thanks!

I need to measure a distance within a 1 degree field of view (FOV) in front of the sensor at a distance well within the range of the sensor. I know I can't use focusing optics on the emitter side without changing the laser class - so I won't. Using a simple aperture to narrow the FOV at the detector side, I would reduce the amount of light returned by roughly a factor of 18. A lens would be more effective, but ST does not provide information about the integrated lens and the effective focal point.  Also, I cannot find the calculator AN5894 refers to "Cover glass integration guides and aperture calculator tools are also available on st.com." 

Hi,i saw that the VL6180X is set to NRND.I need the functions of gesture detection and ambiation light measurement.I want to use it in a new product which should be produced more than 10 years but in this case i dont think that this is the right one.Does ST recommends a replacement type? Thanks for helping.Jo

Hi,I would like to ask about the difference between the two modes of offset (PerformOffsetSimpleCalibration and PerformOffsetPerVCSELCalibration).Because when the crosstalk calibration value is high(calibrationData.customer.algo_crosstalk_compensation_plane_offset_kcps>8000),I use the " PerVCSELCalibration" mode, the offset calibration value will be very large, causing my distance data to wait a lot.But when the crosstalk calibration is high and I use "SimpleCalibration" mode, the offset calibration value is not very large and the distance data is normal.So I would like to know more about it:1, the difference in how the two offset modes work.2, does the crosstalk calibration value have any effect on the offset calibration?Thanks  

(A translator was used for this inquiry.)Hi,I am using the vl53l0x sensor.I would like to inquire about the detection range of the sensor.What value do you get when the wall you want to measure the distance against is tilted? (Refer to image1)What point distance do you get if the minimum length between the sensor and the wall is 100 mm and the maximum is 200 mm?I know that the maximum measurement distance of the sensor is 2M.I would like to know the range of the detectable area when the wall and the sensor are 2M away.(Refer to image2)Thank you.

Hello guys,Im trying to learn about LoRa and else. Now, I am using an SubGHZ_Phy in stm32wl sdk. The problem is, when I am using vl6180x codes in while loop without sequencer, it does work! But, When I am trying to implement it with a 5 min util timer and a sequencer; VL6180x sensor does not work properly! It needs to measure a singleshot distance, in first start my readRange command returns 0. After first attempt, second and other attempt; it gives a value but I know it isn't true. I have already read about sequencer, I thought that my mcu turns off every peripheral and thats causes a problem like this. How can I solve it?

I want a code to reset the sensor, and put it before all my routines so I can get the MCU and the sensor to re-synchronize.That are the steps of the technique to reset 1.to find gpio pin has the ability to lift and low And Connect that pin to the Xshut input. 2.A bootup lower the GPIO, wait a few ms, then lift it. Wait a few ms for the sensor to boot, and carry on. Should fix you right up.I find a code my colleague suggests that to me he uses it to for BME sensor but I want to use it for Vl6810X sensor This code is also prepared for hardware error (handled elswhere, by a simple if. ).He told me : So if really not able to start it and variable Emergency_stop_all goes over 3 all functionality will be stopped for safety. (Is controling a 120L electric water heater. it has 2 BME280, using different address, on one almost 2m wire and still reliable. 1m of it is inside of a metal tube inside of the water heater, that acts as a shield.)if (BME.getMode() != 3){BME.reset();szenzor_1_e

Hello guys,Im trying to learn about LoRa and else. Now, I am using an SubGHZ_Phy in stm32wl sdk. The problem is, when I am using vl6180x codes in while loop without sequencer, it does work! But, When I am trying to implement it with a 5 min util timer and a sequencer; VL6180x sensor does not work properly! It needs to measure a singleshot distance, in first start my readRange command returns 0. aAfter first attempt, second and other attempt; it gives a value but I know it isn't true. I have already read aabput sequencer, I thought that my mcu turns off every peripheral and thats causes a problem like this. How can I solve it?

Hi how are you …i bought a new esp8266 (also I bought logic level shifter and 74125 IC) and built the project from the beginning as the schematics in the beginning it works fine the rgb ring lights up and the sensor responds and performs the interruption function BUT when I reset the esp nodemcu v3 or unplug the replug the usb to pc the sensor didnot respond …do yoou think that because I still didnot connect the logic level shifter or the ic between the ring and the esp ?note :I connect the shdn pin on the sensor to 3.3v but that part nit in schematics

I‘ve seen that on the datasheet of VL53L8CH it saysHighly configurable CNH in order to meet user expectations– 64 zones with 18 bins at 15 Hz– 32 zones with 36 bins at 15 Hz– 16 zones with 48 bins at 25 HzMy question is how can I configure the frame rate of the CNH data output and how can I estimate the real data output frame rate？

Hi,I'm using P-Nucleo-VL53L8A1 multi-zone time of flight sensors for smoke detection in the open air.I've seen STSW-img043 MZAI_EVK_v1.0.1 for calibration and recording sensor data of VL53L8CH.I would like to know what is the best Machine learning method (ANN, CNN or ...) for training a reliable model with small footprint for STM32WLE series.Does STMicroelectronics support ready to go example for building and training an ML model for classification of VL53L8CH data?Which tools should be used to convert the model to a c library for embedding the ML model in the MCU? Thanks.

Hi,Just receive the SATEL-VL53L8 kit. It contains 2 boards but which one is the VL53L8CX or VL53L8CH.RegardsJP

Angle of incidence webinar question follow up… Original question - What angle of incidence performance information is available for these devices?  More detail - For multizone FlightSense sensors, looking into the corner of two walls for example or at a concave/convex  surface, each zone is not perpendicular to the sensor.  At high angles of incidence I assume the distance result from that zone will the average across the area of the zone.  Is that correct?  I'm assuming that at very high angles the histogram function might start to come into play, perhaps not, but if so what angle would the histogram function start to think there were multiple targets?  Or does the histogram functionality recognize that the distribution is kind of linear so the surface it's viewing must be at some angle?  If it does recognize that it's at an angle does it use this information for the average distance to the surface and or to calculate the estimated centroid of the su

Hi, could I please get access to the 3D CAD Models for the LPS28DFW and VL53L4CD products? On both of their "CAD Resources" page you only offer the PCB Footprint and Symbol and not the 3D Model. I need to utilize the 3D model for designing a component that utilize both of these sensors. The datasheet dimensional information provided is not sufficient for this. Any help with this would be greatly appreciated. Thank you

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. Question 1: Our application sometimes also shows status 14, which is not described there. What is its meaning? Question 2: Some of the short descriptions are self-explanatory, others are not clear. Is it possible to provide a more detailed description that explains the status in more detail, i.e. what it really means, under what conditions does it occur and what is recommended to avoid it?

Hi, i would like to increase the range of the VL6180X but i don't know which register i have to modify. I see the code in the RangingAndALS_NucleoXXX sample but i don't understand how the VL6180X register have been modified in order to increase the measuring range.

Hi there, I'm planning to integrate the VL53L4CD sensor into my custom board, which features the STM32G484CEU6 MCU. After reviewing the datasheet, I found that the sensor operates within a voltage range of 2.6-3.5V (nom 2.8V). I just wanted to double-check if it's safe to connect this sensor directly to the MCU, considering that the I2C interface of the MCU is 3.3V. Thank