How to Make a 2 Sensor Proportional Line Follower in EV3-G

[@samtenthije2419]

being efficient is always good ;)

[@jakubfrgal7112]

I just made proportional program, but better. When the robot drive of the line he remember witch sensor saw the last value 25 (white) and the second too it will get the last value and then come back to the line. It works really well. Sorry for my english :P

[@gerardgarcia9265]

Thank´s for your time !

[@alialqallaf6565]

Keep up, you're my teacher please don't stop. 😘😘

[@Builderdude35]

Don't worry, more tutorials to come!

[@Karl-yq1hd]

While I was playing around with 2- and even 3-sensor line followers, I came up with quite a bit ideas, however the one you utilised didn't come to mind! Way simpler than what I had done, I must admit. However can your robot react to if it has lost the line, for example if it has to turn a 90 degree turn? My 3-sensor design can :p I will make a video of it soon enough, you will see what my idea was.

[@samtenthije2419]

how does that work? 3 sensors?

[@Karl-yq1hd]

sorry replied with my other account, I mess up sometimes. :p (Karl Aleksander Leoste is me, just another account) but, back to the point, how 3 sensors works is the two front ones detect which way the line is going and the middle one detects how far off the line the robot is. I also added a memory system to keep turning if the robot should be off the line.

[@thomasq.z.4615]

great job! keep it up!

[@Builderdude35]

+Qian Zheng Thanks!

[@arhamjain7306]

Nice and I will make it to my blocks

[@hongleiyu1730]

Builderdude35, thank you. I like ur vids and u have helped me out a ton. And the pid line follower was way to complicated for me and my dad said that it was college stuff. By the way, this isnt my utube account

[@Builderdude35]

I'm glad to have helped! and yes, PID line following IS college level. But it's certainly not necessary; there are simpler programs that work about as well.

[@jeroenodb]

I think that if you do the sum of the two sensors, with one minus that you a better result.

[@gabrielferreiragomes6220]

Hello, I'm Brazilian. I do not speak English and I'm using the translator to talk to you. It explains to me which part he sees in black and in which part he sees white could answer that comment to explain me. I look at the translator.

[@combatwombat4957]

So helpful very epic

[@anushiyak8116]

hi!! dude this is gud ...We tried this program ...could you please explain about the values u given for two math blocks???

[@nromy2006]

did you try it to cross an intersection with a green mark?

[@anamtaassociates1909]

Want to make for completion help which would be better

[@kitsune7017]

Could this tackle smooth curves?

[@efthymiosn3381]

hi, i love your videos. thnxs very much. I'd like to ask you if we have made callibration and set white to 100 what should 35 be replaced with?

[@Builderdude35]

+bob xatzibasiliou Use "Port View" and place the color sensor half over the black, half over the white to measure the value. It should be about 50.

[@efthymiosn3381]

thnx

[@bohnman]

What is the model number of the wheels you use?

[@Builderdude35]

+bohnman #88516 and #88517

[@timothykim6693]

Hi, also I was wondering if you can make a video of how to make a autonomous soccer bot.

[@Builderdude35]

+Timothy Kim I have a video on how to build one, but not one on how to program one.

[@johnnyfalcon184]

I tried you 2 sensor proportional program but I couldn't get it to work. Any suggestions. I want it to go 2806 degrees and then follow a curved line and then stop.

[@Builderdude35]

Send me an email through the "Contact Me" form on my website (builderdude35.com) with a description of your problem and what went wrong.

[@timothykim6693]

Hi, like your video but I was wondering if you can make a video of how to make a robotic arm.

[@Builderdude35]

+Timothy Kim I have some videos similar to that. See "How to make a Claw and Lift Mechanism."

[@timothykim6693]

+Builderdude35 thanks

[@teghveersinghrekhi2339]

Hey i was wondering if u could explain the use of math blocks in the program again

[@Builderdude35]

+Teghveer Singh Rekhi Sorry, I don't think I can explain it better than the video. :)

[@teghveersinghrekhi2339]

Ok thanks

[@ΘάνοςΜαρκούλης]

Can we take a close turning or just a turning with this robot because in Greece we have a contest and i need to know.Please give me an answer quickly because I need it.Thank you very much!

[@Builderdude35]

+Θάνος Μαρκούλης Sorry, I'm not sure what you're asking.

[@ΘάνοςΜαρκούλης]

+Builderdude35 sorry i mean turns

[@Builderdude35]

+Θάνος Μαρκούλης You can adjust the turning to your needs with this follower.

[@KolisiHoorn]

Can you make a video building 2023 robot ideas😊😊😊

[@abcs1942]

Hi Builderdude35! I have a question. How do I limit how many rotations/seconds the robot line follows?

[@aureliony]

use a loop block and loop for X number of motor rotations.

[@safaemirilbey565]

I don’t now a white line follower How can ı make it please help me you describe you new video ı am from turkey so ı speak some english ı want to add a turkish subtitle

[@safaa8065]

hi! i was wondering, after the robot finishes the black line, does it just stop? bc u always cut it off and i never know what happens to it. thx :)

[@Builderdude35]

No, this particular program repeats infinitely. You need to program some kind of case for it to exit the line following loop.

[@anmolkaran57]

@@Builderdude35 How do I do that?

[@rascubulous]

you should do a 9 sensor PID line follower

[@Builderdude35]

I like that idea!

[@ggg-pq8jq]

can it do curves?

[@siddiqkhancmsrobotics3136]

Plz make maiz solver with 3 color sensor if possible

[@anmolkaran57]

How do I make it stop at the end of the line instead of continuing to go?

[@Builderdude35]

Check out my tutorial on loop interruption.

[@ahmedabbasi6976]

hi . what if i use the line as a track the after following it for couple of inches i want to switch to do a mission next to it

[@Builderdude35]

+Ahmed Abbasi Set the Loop block to end after a certain number of degrees or seconds.

[@ahmedabbasi6976]

+Builderdude35 thx

[@Brian-jn2pi]

How could you convert the proportional part to PID? Do you put a PID program where you put the proportional part?

[@Builderdude35]

Excellent question! The PID line follower is an extension of a proportional line follower, so you can start by programming a proportional line follower then building more on top of it. My video on PID line following will explain everything: kzbin.info/www/bejne/d36liImVfayMoJY

[@Brian-jn2pi]

Great thanks!! i've watched the video twice haha. Thank you so much for these videos!!

[@Builderdude35]

You're very welcome!

[@KhoaNguyen-mq1he]

Can you make a Gyro Turning Program? I have my own, maybe you could put that on a video?

[@Builderdude35]

See my video on Gyro Following.

[@minhnguyenduc2620]

What is the link?

[@novarecondo3868]

How did you place those sensors?

[@Builderdude35]

They're simply attached to the dig gear interface on the front of the robot. The sensors are placed one stud apart.

[@hindalrobaidy9739]

Excuse me , I want the robot form desine steps please

[@itteacher9168]

how can i program it, if i want the color sensor to compare the colors, not to compare RLI. ???

[@Builderdude35]

+it teacher Check out my video on the color sensor, coming this Thursday.

[@itteacher9168]

+Builderdude35 i will wait for your video. BTW, i tried the program in this video.. i doesn work. the robot only turnning around. i did exactly as you did in this video.

[@weeettyremmle8041]

cool

[@fasihah5425]

Hi may I ask

[@chrisweixunlai5677]

What should i do if my 1 of my ports till remain color

[@Builderdude35]

Sorry, I'm not sure what you mean.

[@advaitmalhotra5384]

can it turn

[@ahmedabbasi6976]

the robot does not stay stable and carve out of the track

[@Builderdude35]

+Ahmed Abbasi Sorry, not sure what you mean here.

[@melcclem9750]

Probally your logic is wrong.... go check your cable where you plug the motors and where you plug your light sensors

[@andrewrommel900]

Does anyone have the code in labview

[@ahmedabbasi6976]

i have another problem

[@GiorgosLegoEv]

What do you mean threshold value 65 when both sensors are over the white line. That's what you said on the video and it makes no sense. And why do you divide by a factor of 1.5. Shouldn't you have multiplied by 1.5. The Formula is Turning = (a-b)*c where a is the light sensor's value, b is the threshold value and c is the turning multiplier. You are confusing people if you are using Math operations out of your mind.

[@Ilianaisme]

In text code this is only 2 simple lines of code with 2 variables. This is why Id never use visual language lol its way too long

[@Builderdude35]

I agree, text-based languages are more efficient in this respect.

[@rascubulous]

that was a joke!!!!!!!!

[@Builderdude35]

I may decide to make it a reality!

[@arhamjain7306]

It is very complicated I have a very much very much easier