How to use the red laser module KY-008 with the Arduino Uno | UATS A&S #3

The Ultimate Arduino Tutorial Series: Actuators & Sensors #23
How to use the red laser module KY-008 with the Arduino Uno
In this tutorial, it shown how to build an optical barrier. The barrier detects any movement between the sender and the receiver. The sender is a laser module (Keyes KY-008) that emits red light (wavelength: 650nm). The laser detector/receiver is an unnamed module that returns either a LOW signal or a HIGH signal (no “analog values” in between).
Written tutorial available at: www.mschoeffler.de/2017/01/20/...
:: List of materials ::
-- Arduino Uno
- Aliexpress: 1smart.click/search/st/ali/ms...
- Amazon: 1smart.click/search/st/azn/ms...
- ebay.com: 1smart.click/search/st/eby/ms...
-- Jumper wires (female/male)
- Aliexpress: 1smart.click/search/st/ali/ms...
- Amazon: 1smart.click/search/st/azn/ms...
- ebay.com: 1smart.click/search/st/eby/ms...
-- KY-008 red laser module
- Aliexpress: 1smart.click/search/st/ali/ms...
- Amazon: 1smart.click/search/st/azn/ms...
- ebay.com: 1smart.click/search/st/eby/ms...
-- Unnamed laser detector/receiver
- Aliexpress: 1smart.click/search/st/ali/ms...
- Amazon: 1smart.click/search/st/azn/ms...
- ebay.com: 1smart.click/search/st/eby/ms...
Video Chapters:
0:00 Tutorial Introduction
0:49 Wiring
2:02 Programming
3:19 Example demonstration

[@diogobarbosa2001]

Thanks alot!

[@liszcgsedt]

Hi, and thanks for the tut. One question that puzzles me a bit though, much as it seems to be answered by Shaun: the transmitter has VCC, GND and SIG pins. My understanding is that the transmitter only needs power, that is VCC and GND ... although it can be powered (and toggled) from an Arduino digital pin. But in case I want a detector in the doorway, having both modules hooked to the same Arduino is rather inconvenient and I will be just fine powering the tranmitter from an external 5V source and only having the receiver hooked to the Arduino (along with a buzzer or whatever output I want). Correct? I mean, I wonder why it has all three pins where two seem to be enough...

[@user-kf8kt4rq1o]

Hello sir can i ask if this sensor can detect the object like plastic bottle,can or paper

[@ahmedmohamed9013]

Does the laser and laser detector both comes with the 41 sensor module kit

[@speedsoft]

is it possible to use this device on 3.3v? ive got a step motor using 5v already.?

[@kozaczi]

Is the light much foucused? Is it like a laser pointers? From 2meters dot is which size?

[@shaunr9950]

Thanks for the video, Michael. Just one thing about the laser transmitter and it not being able to operate in normal light conditions. This is not correct. Your video shows the laser transmitter receiving current when Pin 2 (I think) is set HIGH. This means the transmitter is receiving power from the Arduino board, which is a relatively small power source and not able to fully power the laser light. The laser transmitter has a 3rd pin (+) which should be connected to a 5V power source independent of the Arduino board. This will provide the laser light with enough power to operate under all light conditions. I have the same laser transmitter and receiver set up on my desk, in bright office lights, and it is working just fine. I even went one step further and shone the light from my smartphone at close range onto the laser receiver and still, the laser was powerful enough for the receiver to detect it correctly.

[@rondlh20]

Here the problem is that the sensor picks up too much background light, so increasing the laser power doesn't help... unless you change the sensor sensitivity. I would suggest to provide some shade for the sensor and use an analog input and use modulation.

[@hankhomaomes2830]

Sir, i m a newbie , I want to know if it is possible to make arduino uno/nano led strip such as wd2812b music sync via internal audio from the pc, I don't want to wire a mic module or audio in jack to a breadboard but simply play my spotify / youtube audio which will react to my LEDs.

[@chihauccisoilconte4474]

Nice tutorial! I have a question: I tried to connect the laser diode to a pwm pin (D12 of Arduino Mega) and for some reason the laser blinks in stead of staying on, do you know why is that (and what can I do to fix this...)

[@nachnamevorhanden3335]

you can google what pwm actually is.

[@simonemastroianni1985]

You can also use a photoresistor without buy the laser detector

[@mschoeffler]

Yes that's true. The laser detector has the only "advantage" that you do not have to enter a threshold value for your photoresistor. The detector module returns only LOW and HIGH (no analog values).

[@gurpreetkourkamthekar8630]

Can u send me the manual of laser transmitter and detector module? & it would be helpful if u show what's inside the detector , what principle it uses?

[@mschoeffler]

Unfortunately, I do not have a manual :( However, these kind of modules are based on phototransistors / photoresistors.

[@JoeX92]

So, what's the middle connector of the laser transmiter for??

[@rondlh20]

The middle pin is for +5V

[@daniel_gaming783]

Is the laser harmful to your eyes?

[@winter1616]

if it goes on 0 can you let go an alarm of ? and how to instal AND wath is thad thing where evrithing is connected on ?

[@tysonbastick1118]

dude its an Arduino, yeah you can set the alarm to go off but thats a lil more complicated

[@rajthakor7]

Where we can see the results 1/0 ?

[@rajthakor7]

Thanks mate

[@RoyAndrews82]

So in order to turn the laser on, it's 5v on the S Pin and GND on the -- pin?

[@mschoeffler]

Yes, correct.

[@syaidatulfarhana9095]

y the output always 1? n the laser detector can not detect the object

[@rian6759]

Can you related why the laser sensor can't opperate normal ? Because my modul ( laser sensor) can't receive signal from laser modul