Shooting laser to measure distance
Вставка
- Опубліковано 6 лют 2025
- I show you how to measure distance with this laser distance sensor. With the help of the Adafruit library is this I2C sensor an easy-to-use item.
It's emitting a laser beam of 940nm and is also known as Time-of-flight sensor
Project page:
rohling-de.blog...
Buy @ Amazon
CJVL53LOXV2 - amzn.to/2txNegJ
Breadboard - amzn.to/2p7SW7N
Ultrasonic sensor - amzn.to/2p8OwN6
Arduino Nano - amzn.to/2p4ntDK
Hello, could the measurment be improved to a longer range with a lens or any other device?
I give it a like.
I have to wonder what is measured. Light travels 300m per microsecond, 0.3m per nanosecond, timing would be in picoseconds to get centimeters.
The sensor filter is to cut out visible light. Check the reflection of IR from black surfaces some time. At least some reflect IR.
The datasheet doesn't state the concrete method. But usually a ToF sensor really calculates the distance by the time the light takes to travel forth and back to the object.
I operated ground-surveillance doppler radar in the 70's. Electronics I don't know allowed the return frequency to subtract the outgoing frequency and we listened to the difference which was FANTASTIC with detail.
Something like that, any movement made noise.
I'd love to see something like that with range enough to incorporate a selective return window, even 20m.
They still make tape measures, in case anyone wants to take a measurement without batteries or interference from sunlight, dust, or some filth over a lens.
can you please tell me what is the angle of detection for this, like in ultrasonic sensor it only measures in line of sight... is that the same case in ToF sensor??
I think it's 25 degree
can it measure with 3 digits accuracy, for example 40.231 cm; 50.446 cm; 21.273 cm, etc ?. And what is maximum range ? . I want to measure distance between 2 cm to 300 cm
Nice tutorial. Can it measure distance from a transparent surface?
Do you think it's possible to use this device to actually focus a laser instead of a image like a lrad military laser defense system
Does it works during night time? And which sensor is the best for measuring distance of uneven surface e.g. human face
Hi and thanks for your nice and informative video,
I was searching for something and found your video,
I have an fixed origin point A and I have another point B in space(not far, in 50cm range) and I want the XYZ coordinates of the point B relative to point A, give me a clue where to start and what to do if possible,
Thanks anyway.
Can you hook 4 of these to a nano?
Hello and thank you! could you please tell what is the sampling time, so I can figure out how many times can I get a good reading per second?
I took a look in the datasheet of the sensor. For the best accuracy the timing is at 200ms.
Can measure in 0.1 mm range??
Will it be used to measure the level of a water container? I need to determine if the level has dropped below a limit and in that case, light a pump so that it refills again.
I would recommend using a ultrasonic sensor for this task. It's more reliable when it comes in measuring water level.
nenioc187 the problem is that when working with salt water (it is a marine aquarium) the oxidation is very fast. that's why looking for an alternative.
Congratulations on the video, very interesting.
I wanted to ask you:
can it also measure the distance of transparent objects?
if the object is not perpendicular to the sensor, can it make the measurement?
I need to measure up to half micro meters in precision, will this thing work?
Half a micrometer? No.
this sensor is similar to ultrasonic sensor??
Thanks for making the video. I was wondering if the laser dot is visible to a camera? The reason is that I want the laser to scan and locate for some object. I want to use a regular camera to see where the laser dot is. If I know where the laser is shooting then I know where my object is located.
Why not using a second, visible laser as a guide on top of this sensor?
Thanks for the suggestion. I prefer using one laser otherwise it will be more complicated I need two lasers and calculate the delta of the two lasers. If the first one is not visible to the camera it is not clear whether the delta is correct.
Since the sensor has a maximum range of about 125cm the deviation would be insignificant.
Is it possible to use laser sensor to measure the water level?
I would probably go for an ultrasonic sensor to measure water level.
@@nenioc187 thanks. I'm just interested in the input voltage that TOF sensor offers
Got 2 different ones. They work great. Now I am trying to figure out how to hook up 2 at once for a position monitoring system. .
The ToF sensor has a fixed I2C address (0x29). It can only changed via a complex programming process. And since they all have the same I2C address, you cannot attach two of those to one controller.
What you can do is to use two controllers, one for each sensor, and let both controllers communicate to each other.
@@nenioc187 Actually I did end up hooking up 3 with a multiplexor. watch this video and here is the links to the ones i used . ua-cam.com/video/zzieeHmFSis/v-deo.html - ebay.us/WBEZpK - ebay.us/9UweGi
How well does it work at finding the distance to the surface of water? Will it absorb too much of the energy, or does it work?
I haven't tried it with this sensor, but many people use an HC-SR04 Ultrasonic Sensor for water level detection. I see a lot of water level detector projects on the ESP8266 Subreddit. A good thing about the ESP is it's super power efficient and it has built in Wi-Fi (at least many do). It does have 3.3v logic instead of 5v though, so you should get an HC-SR04P or HC-SR04+ as it can use 3.3v logic, or you can get a Logic Level Converter.
Hi! Thank you for the video! I've been working with Vl53l1x but It has real problems with precision, %3. Do you know a similar sensor with a high precision and resolution? By the way, I need it for 2,5 meters
For this distance I would go for a ultrasonic sensor. You can increase the accuracy even a little more by adding a air-pressure .sensor
@@nenioc187 I didn't find the cheap HC-SR04 ultrasonic sensors very accurate. Generally they worked fine, but it would regularly give me a random 'out of range' reading. It also depends on the shape of the object, if it's a nice flat surface the sound will bounce right back, but if it's pointing at a human walking past which is more rounded and covered in clothes it doesn't bounce back the sound very well. So pretty good for self drivng cars that have to detect walls and good to detect the water level in a water tank or well, not amazing for a burglar detecting system. But the more expensive ones should be múch better I've heard. They can get pricy though. I do think the cheap ones have a range of about 3 meters which is nice.
Each distance sensor is limited by it's reflective characteristics. But I took a measuring tape to verify the accuracy of the ultrasonic sensor. I've tested it with an accuracy of about 1cm and it still reached the 3m. Of course under perfect conditions. But you are right - you usually can't expect industrial precision of a 1 € sensor. For a anti-burgular system, I would recomend another approch anyway.
@@nenioc187 ok thank you!
i want to use it for people counting in a room. i need direction for + and - for counting
Point it to the door. If distance stays constant, no one enters or leaves. If the distance decreases, someone moves away from the sensor. If it increases, someone moves towards the sensor. Or use two of them close to each other as a barrier. If sensor 1 and then sensor 2 changes distance, someone enters. If sensor 2 triggers first and then sensor 1, someone leaves.
Does anyone know if it possible to code in a 'set' button, so the screen reads '0' and the measurent counts up as the item moves closer?
Thanks
Of course. You can do it through the code. But it won't extend the range. So if the sensor has a maximum range of 1 meter and you place an object 20cm in front of it and reset this distance to zero. Than you only have 80cm distance left for measurement.
Great video! Did you notice if it can detect quickly moving hand wave across sensor?
I didn't test it. But surely it could detect a hand. Just by identifying whether the distance has changed for a short period. Although it cannot detect gestures. But there is also a sensor for that ;-)
so what is the range with the protective film removed?
The standard range is up to 120cm. You can change the range profile so that it measures up to 200cm (only in a dark environment).
i2c detects 29 but that code only returns 65535 on mine. I have 2 and get same results on both. Also notice the baud rate is 115200 on yours. Changed my com pot to 115200 in Windows. Still not working?
"and maybe works a little better after removing this protective skin." Dude you need to retest it, that sticker looked like it would attenuate the signal a lot!
Actually it doesn't increase the range or accuracy. But I was getting less false positive results without the foil. And that's something ^^
Do you have a multiplexor to hook up 2 of these at once? I am trying to figure it out for 2 precision triggers.
I have a question...is it possible to measure distance from a non-flat (rounded) object? Thank you!
Only if you hit it directly. But there is a high chance that the laser beam is reflected NOT back towards the sensor. Because of physics.
Thanks a lot, I tested and it worked.
You cannot use that on sunlight ,I tried it and it is blind but perfect inside
Hi, is this sensor can usable behind glass window?
Can we use this somehow to measure in three dimension and not just two dimension.
did removing the protective film change the sensor results?
It seems that I get less false positive results when removing the film. But I didn't verify it scientifically.
You will still get inaccurate results on matte black objects, obviously.
Do you know which surface gives the best results?
@@opolip001 i guess that would be white reflective surfaces ;)
what is the range of the sensor
But sir i want to know how to program it with rasperry pi can you please make a video on this or you can please help me with the code
to how to program this with rasperry pi
Hi. Thanks for sharing. What sort of minimum refresh can it achieve? 10ms, 100ms? I wonder how many RPM would it detect using wheel with opening. Also, is it possible to weather seal it?
Corresponding to the datasheet it has a high-speed mode. Then it has a low accuracy, but a refresh rate of about 20ms.
www.st.com/content/ccc/resource/technical/document/datasheet/group3/b2/1e/33/77/c6/92/47/6b/DM00279086/files/DM00279086.pdf/jcr:content/translations/en.DM00279086.pdf
Thanks. I might go with Infrared sensor of a sort instead.
Eddie what's your application? I used an IR prox sensor left over from a line following robot project in a project that required wheel speed measurement. We were using pieces of reflective tape as triggers, not openings, but I suppose the latter would work just as well.
Fed the output into a comparator to adjust the noise floor and also to provide a sharp edge transitions. Then fed that into a pin on the timer I/O capture/compare channel set for rising edge capture. That kicked the value of the running timer into memory, then we just used consecutive captures to calculate RPM.
Using this method took everything else out of the equation, leaving only the micro's speed as the limiting factor.
I was thinking of sensing speed of motorcycle's back wheel. But for this I need much faster device. Apparently this device would stop accurate measurement after hitting around 30km/h. I might be wrong though.
I did check iR one and that seems to match my needs.
Eddie for that kind of application I'd be weary of using _any_ light driven solution that isn't self contained in one way or another. Basically, you'd want all sensor elements contained inside a "black box" with a single mechanical input such as a shaft that is well sealed from the elements, and driven by something on the wheel or something already mechanically coupled to the wheel, like the transmission output shaft, sprocket, chain tensioner/follower, belt tensioner/follower, adding one of the above, etc. Our device was extremely temperamental, and the bike wheel was just being used as a way to convert linear motion into rotational, and was used in a very clean environment. Not only in regards to "gunk," but "light pollution" as well. You may be able to find an IR solution that works for your application though. It is a rather cheap and easy option, so even if failed in real world testing you wouldn't be out much.
Another non contact option is using a Hall effect sensor. Also quite cheap, and have been used reliably in the auto industry forever. Also, if the bike is chain driven you might be able to use one of the sprockets as a trigger wheel instead of fabricating one. Or go with the old standby of a magnet(s). There is also a nifty chip that contains multiple Hall sensors for use as a non contact rotary encoder. This requires a small round specialty magnet in/on the end of a shaft. Works great for RPM, but generally requires some kind of calibration.
This all goes for something permanently affixed to the bike and exposed to the elements/road grime/whatever. If it's a diagnostic tool your options open up considerably.
Hope this has been useful in some way for you!
what is the maximum distance of sensor?
2 mtr as per as datasheet...
Got me to subscribe at "pew pew pew pew"
Keep on going with your very helpfull Tutorials. Many Thx for sharing your knowledge with us. Best regards from Frankfurt am Main (Germany) L.Longer
As long there is such a great audience, I'll keep on posting videos. The next one is already made and waits on my cutting table.
And greetings from above the Ruhr ;-)
how does one make one that can measure 1000 meters?
Dude, use OBS Studio to record your desktop. Also, consider a better display than serial dump, like something in processing.
I'll try, if OBS Studio is something I can work with. But the serial dump is what every maker have. And since I'm making videos for beginners and experts the serial monitor is something everyone can handle.
Did you also find out the maximum distance of the sensor can measure?
125cm
I have one problem following your method
What is the sensor's accuracy?
Can anyone suggest what kind of sensor is good for measuring the badminton's birdie smashing speed? I am trying to figure out if i can build an affordable home made (DIY) arduino device for measuring the smashing speed of birdie. The laser sensor can only be used when pointing to the object, correct? The birdie is small and moving object. Will that be an issue for the laser sensor? -Thank you!
The laser sensor can only measure the distance of a fixed point.
what battery would be required this run this for 6 months
Depends what microcontroller you're using. I know ESP8266's can be put in deep sleep mode. If you put it in deep sleep mode, let it wake up to take a reading, let it go back to sleep for a couple hours you might run it for months on a button cell. There are even more energy efficient microcontrollers I think.
You had me at PEW PEW PEW PEW!
Hi. How could it be possible to connect 2 or more of these laser modules?
I think it's only possible if they have different I2C adresses. So maybe you could try 2 different variations of the laser modules (check in the product description of they actually have a different adress) or I think it's possible to change the adress on one of them. But that might require you to change a small SMD resistor on the laser module which is quite tricky.
hello, do you know the error in the measuring of distance ? it is 1 mm ?
Corresponding to the datasheet it's offset is from 10mm up to 30mm max.
what is measurement range ??
I used this sensor with Arduino Mega but it keeps saying "Failed to boot VL53L0X
." Does anybody have any idea how to fix this?
Hello i have a question what is the max distance of the module?
125cm
which sensor did u use ?
can you add code to read few values and have the time at which the value was measured?
You can easily measure the time with the milis()-method: www.arduino.cc/en/Reference/Millis
thanks i will buy this for my thesis haha
This could be used to make a 3d scanner
but how fast is it, is my question, response time
Corresponding to the datasheet, it has a performance of 20ms in high speed mode.
@@nenioc187 Does that mean I could get ~50 measurements per second? I want to create a 3D scanner where the laser (several of them) quickly moves up and down taking measurements while the object being scanned is revolving on a table. Also, how precise were the measurements?
@@nenioc187 Ah, never mind. I just read your response to another: "corresponding to the datasheet it has a high-speed mode. Then it has a low accuracy, but a refresh rate of about 20ms."
Hello.
can i connect it to the PLC ?
my goal is to display the output distance on the HMI, and can export the measurement data to excel file.
Adding a lense should boost the distance to > 10m.
Hey
Can it recognize something as fast as a fly?
A fly is not really "fast". But small and difficult to track.
1.2m doesn't seem like very far, isn't there anything that could scan a room or garden? Say 20m
You can just buy a commercial laser measurement device. Ali has them from 15 to 40 € depending on range. Got a 40m one this week and it's pretty darn awesome. Calculates all sorts of things too - like rectangle, room, triangle sides.
Where is your arduino code?
bonjour quelqu un sait il comment avoir une mesure stable au lieu d avoir une multitude de mesure les unes derrirere les autres qui est inexploitable merci.
Bien sur, tu fait une moyenne sur 10sec par exemple...
Hello,now if I want to study electronics do you give lessons online for unprofessionals moreover I do realise how far life critical motions are changing the mode of science realm I don't know whether I'm right to all wright worlds or not still I can cope through the insensibility of your description here .Hey take any electrical device and tell us these are the latest inventions for it and like that .I know how this life works for good and bad although what mostly matters is your professional certificate and believe me no one in this world will stop you from doing so close your eyes and days will tell you that sharing perfection is an important particle to human faith .Therefore,God gifted me a land of treasures and I do respect that science is a gift too our traders are not sophisticated to the level of equipments (induction & deduction of strategies in between countries contracts) You are a scientist predecessors or a certificate holder this last licence to work is called now a car licence of course it's not a vehicle your mind is and look around you everything is connected to technology a human became a robot or an author as I'm doing here.It's dull to read my words but I advice you to read it more than once (tinker bell magic)
Thanx its good overal
OK, let fined springs can do the job
do you have anything that I can build to help me see in the dark and see heat images in the dark while hunting animals that damage 100s of acres a night?
Kenneth Elston Flir One
what's the cost for a cheap one? Adafruit had them for $400+ the last time I saw them there
flir.com has the Android version for $249. The iPhone version is unavailable until version 3 comes out
and what about lenses?)
Haven't tried it yet
Thanks for video
It's my pleasure!
How do you detect range of 1km with a laser
There are laser distance measurement devices that can detect up to 1km. You can find them at golf accessories. No kiddn'! Look for "golf rangefinder".
nenioc187 Yep I know those. But I'd like to build em with arduino. Any chances?
I won't say you can't. But I doubt it would be easy or cheap. Maybe there is a easier way to archive your task?
It's almost 10x expensive than cheap ultrasonic sensor so not really an economical choice but yeah small size is a plus point
sounds like papa emeritus
So, you're asking, if I am Tobias Forge... Am I? - No, I'm not.
What is the min distance it can measure ??
Corresponding to the datasheet, the minimum distance is 50mm.
My Risk with pololu piece cost me 15 buck
On Aliexpress in 15 bucks, u can get 3-4 of them...!!
ST just release VL53L1X ToF ,They claim it can measure up to 400cm and can be replace VL53L0X with same pinout!
When I find a affordable source for this sensor, I'll gonna test it. Thanks for the hint!
nenioc187 I just ordered the module from the Ebay .Wathing for ~11 days to arrive.
Tell me, if it's worth the 25$ ;-)
I found the module (also ordered amd wait for arrive) price is around 10 bucks
Found it for around 18 bucks. incl. shipping. Ordered it right now ;-)
ich muss furzen
What is the resolution for this sensor?