Imaging (sensors)

I saw somewhere in the forum that the TOF sensors see [optical] pings from other sensors as ambient light (meaning they are able to ignore them) but are still able to detect their own bounce. Is that true? If yes, can someone explain how that works?Note, I'm referring to the situation where you have independent devices in an area moving around, each of which have their own TOF sensor(s) for obstacle avoidance. The point here is that there is no synchronization between each device, so there would surely be overlapping [optical] pings.(I accidentally posted this to the wrong forum group, so this is a re-post of the same question) 

Hi, I am struggling to understand how to calculate the load capacitance when adding the pull-up resistors in my circuit with VL53L4CD ToF sensor to run the sensor in fast mode plus. The datasheet states that:Suggested pull-up and series resistors for I²C fast mode plusI²C load capacitance (CL)(1) Pull up resistor (Ohms) Series resistor (Ohms)CL ≤ 90 pF 1.5 k 10090 pF < CL ≤ 140 pF 1 k 50140 pF < CL ≤ 270 pF 0.5 k 50270 pF < CL ≤ 400 pF 0.3 k 501. For each bus line, CL is measured in application PCB by customer.VL53L4CDI am using a NUCLEO-F401RE evaluation board that is communicating and driving the ToF VL53L4CD-SATEL board. Anybody can help with this? Thanks in advance.

Hello everyone,I am trying to read data from three SATEL-VL53L7CX, using only their mini-PCB part, with a Nucleo F401RE.To do so, I did the following wiring:each sensor is using a different I2C bus (sensor 1 is plugged on SDA1/SCL1, sensor 2 on SDA2/SCL2, etc)the GND of each sensor is connected to the Nucleo’s massIOVDD and AVDD are respectively connected to 3.3V and 5Vthe LPn pins are connected to 3 different GPIO pins (D2, D4, D6)I am using Arduino IDE to develop the code. Here it is:/************************** INCLUDES **************************/ #include <Arduino.h> #include <Wire.h> #include <vl53l7cx_class.h> #include <stdio.h> #define DEV_I2C Wire #define SerialPort Serial #define LED_PIN PC13 #define TOF 3 // number of ToF #define LPN_PIN1 3 // sensor #1 wiring #define LPN_PIN2 5 // sensor #2 wiring #define LPN_P

As it is described both models are dedicated for  AI applications. Where can I find examples of usage or materials to start?I assume I can use NEAI Studio?

Hi, I was wondering what is the SR03 settings in initialization of VL6180X ToF sensor? I had gone through the user manual & application note AN4545 but i couldn't get the answer. If someone knows please explain. It just for educational purpose only.Thanks in Advance,AK.

Vl53l3CX works well when i init it with DataInit and StartMeasurement Function,but when i add a OffsetCalibration to its init sequence,it output a distance of 8191 mm,which is obviously wrong .Paraments of calabration function are shown in the  following picture,is there anything wrong.any advice will be appreciated.

I purchased X-NUCLEO-53L5A1 and NUCLEO-F401RE board. I assembled them and followed the Quick start guide X-NUCLEO-53L5A1 manual. I can't connect the device in the VL53L5CX. I update firmware and ST-Link before. I connected to the ST COM port via terminal. Report you can find in the attachment.Why does this happen? Thank you in advance.Jan

Dear Sir,     I am trying to read the distance from the VL53Lox i can read upto 400mm , when i try to measure more the 400mm it is not reading proper reading. Please guide 

Hi there!​I was wondering, for a school project, if it is possible to disable te autocalibration on the VL53L5CX and if it would be possible to manually calibrate it?​Thanks! :fox_face:

The ULD driver VL53L7CX_ResultsData object type contains range data from the VL53L7CX.  Each member that holds data for multiple zones and targets is organized in an array.Items signal_per_spad, range_sigma_mm, distance_mm, reflectance & target_status contain one entry for each possible target for each 8x8 or 4x4 zone.  Additionally, members ambient_per_spad, nb_target_detected & nb_spads_enabled contain one entry for each zone.  Lastly, member motion is a 32 element array.  According to the user manual, this contains motion intensity for each zone.  Given that there are 64 possible zones, it is not clear why this array size is 32.I could not find any documentation that explicitly states how the data is organized in term

Hello There,I'm successfully able to run VL6180 with interrupt functionality. But have some functionality queries.The application is intended to generate interrupt when reading a distance below specific threshold. I found that we need to Clear Interrupt bits every time after interrupt is generated. Actually, I don't want to do that as per the application requirement. With that GPIO1 I would be driving external hardware (mosfet to be more precise) directly without involving MCU.So, how is it possible to make the sensor generating interrupts continuously without clearing interrupt bits?Regards,Keshav Aggarwal

I want to know whether the calculation of integration time using kcps and signal peak count is correct or not Signal = 3.83 kcps/spad (3.83*1000*211(SPAD ea ))/2099  =385    =>  1/385 = 2.6 ms Ambient & signal kcps, is the integration time the same?      

Hi everyone!I have a not conventional question to this device. INT pin is used in library to send interrupt to MCU. In my case i use just necessary part of library so the INT pin is not used at all.So now the question. Is it possible to use it now the way i want it to?  For example there is a register i can change so the state of INT pin will also change?  

Dear Sir, We are currently in the process of conducting crosstalk calibration using the VL53L1X ultra-lite driver, but unfortunately, the results we're obtaining are not as expected. Our approach involves utilizing an A4-sized gray chart board as the designated target. Presently, the xcd reading registers at approximately 840mm, with the chart positioned at a distance of 1000mm from the VL53L1X sensor. The corresponding signal strength is indicated as 11064. After implementing the calibration procedure through the VL53L1X_calibrateXtalk() function, we retrieve an xtalk value of 0x99C6. This value is subsequently applied in our crosstalk compensation calculations for ranging. Our observation involves ranging a stationary target. Curiously, despite maintaining the target's immobility, the resulting range status reads as 7. As an experiment, we moved the chart closer to the VL53L1X by 100mm. This adjustment led to a range status of 0 and a corresponding range dista

Hi there, My team and I have noticed an irregularity in our VL6180X sensor data that we do not understand. Despite having a stationary target (~75mm away), the calculated range values from the VL6 appear to "wave" over time, and do not settle into a steady state (see screenshots). When running as expected, the sensor typically reads a consistent range value with a variance of +/-3.5mm between readings. Please note that we have eliminated all sources of cross talk as well and are conducting our experiments in a closed, dark tube that is not exposed to direct light. What could be the issue here? Is this normal behaviour for the sensor? 

Hello,I'm working with VL53L4CD to have the distance between the board and some liquid. This distance could go from 20mm to 250mm. We want to protect the board with a glass and then do a calibration, first Offset then Crosstalk. Into the user manual, I found that I need to do the offset calibration on a 17% reflective target at 100 mm and the crosstalk calibration on 17% reflective target at maximum ranging distance without under-ranging. My questions are : - Do we really need a 17% reflective material as target ?- 100mm is mandatory for the offset calibration ?- As our system goes from 20 to 250mm, is it possible to perform the Crosstalk calibration or do we need to take the board outside of our machine to be at the right distance ?Thank you for your help,Kind regards,

I am presently in the process of evaluating the VL5315CX LiDAR sensor without a coverglass. However, I anticipate the need to incorporate a coverglass soon due to the dusty environment in which it will be deployed. My inquiry pertains to the sensor's performance when using the coverglass. Specifically, I would like to know if the VL5315CX, equipped with Xtalk calibration, can continue to accurately detect objects at close range (ranging from 2cm to 60cm) when the coverglass is in place. Additionally, I am curious about whether the VL5315CX still requires Xtalk calibration for distant objects (beyond 60cm) when the coverglass is utilized

by using the cover glass can the sensor still able detect close ranges (after calibration)

..

Hello,I'm using a VL53L1CB with X-CUBE-TOF1 but when i try to use the blocking one shot mode, i always get 0 target.If i use the blocking continuous mode, the first measure will always return 0 target and only the second measure will return a target.The workaround is not ideal because it use 3 times more energy than the failing one shot (~1.8mC vs ~0.6mC).Is there something special to do to make the one shot mode working correctly ?

I'd like to work with the raw histogram data from the VL53L8CH, which I don't believe the VL53L8CX has. Currently, I don't think that there's an evaluation board for the VL53L8CH, but it says it is "pin-to-pin" compatible with the VL53L8CX. Does this mean that I could remove the VL53L8CX from its evaluation board and drop in the VL53L8CH?As a side question, I know that the VL53L3CX is not supposed to have accessible raw histogram data, but does if you view the raw serial data after connecting to the evaluation GUI. Is this the same for the VL53L8CX? I was just discussing this with a professor who I believe was helped by @John E KVAM a while ago.Also, thank you all so much for your help! Forums like this make it so much easier for researchers to get new ideas developed.

I am trying to read the distance from VL53l0X IC, but could not read succefully. I need the simple sequence of I2c commands , so that i can read the range continuosly. 

Does anyone know the MTBF for the VL53L5 sensor?  Thanks.

Hi ST experts,Is VL6180X comparable with TMD2635? 

Hi there, I have recently met a problem in calibration of VL53L8CH/X. So I need to get its intrinsic matrix. Where can I find it?