Thanks for the tutorial. My 8 year old daughter was able to input the program and we got it working with a little trouble shooting... we had the Move Tank set to On for Rotations rather than just ON. So great to finally create something with the EV3 that works really well. We created a wavy line and it still followed it smoothly at 50% output to the motors. Thank you for your video!
Thanks so much for sharing, I had the team I was coaching watch this video. You did such a good job of explaining that the 5th graders were able to program themselves and even troubleshoot per our unique lighting challenges. You deserve a hug.
If you have a long straight line, how about follow the line for a fixed distance, then simply move forward until the RLI value out of certain range? When there is a curve, the RLI value will be out of range, then use the follow the line program to get back on track.
hi, i have a problem, i folowed u`r instruction, got irl for black between 8 and 12 and for white between 62-72. so i`v made this program, but the robot isn`t folowing the line, hes turning to much and lose the line, then its start to spin in circles. what is the problem? do i need negative powers? the color sensor is situated between the wheels, exactly at the midle point where are the red parts of the motor
Hi Emma! Is it possible to make the robot stop after it sees no black line I need this for a project. Or is it possible to make the robot stop when it sees no ground (exe) i put it on a table and it goes straight to the edge and stops?
MegaJustshutup this is tricky, you can try to let the line following program exit loop when the RLI value > you white area RLI, or RLI value = 0 (if the color sensor go out of the edge, the RLI value =0)Or, if it's acceptable, you can define the line following program to stop after certain distance.
Kobi Haig technically, you only need one color sensor to follow the line smoothly with this program. In a competition, you may want to install 2 color sensors to follow different lines based the position of the line...
this is a really helping. I built the robot and it seems to work very well in smooth curves but fails in sharp corners even if I reduce the speed. please help
Erik Art -Add Loop-Move Forward (Turn Moving Steering On)-If the left color sensor sees a black line (Use Switch Block)-Turn Right (Moving Tank)-If The Right Color Sensor sees a black line-then turn left-Loop back (Repeat The Process)
When you do propositional line following, the robot follows the edge of the line. whether you follow the right edge of the line or left edge of the line, it depends on whether you pass B-Power to B motor, and pass C-Power to C motor. If you want to follow another side of edge, try to pass B-Power to C motor, and pass C-Power to B motor. You can take a look "EV3 Programming 2.1: How to follow a line with sharp curve". In video 2.1, it shows you how to switch the edge. hope it helps.
I have a problem now, I changed the C value once then changed it back but now the B-motor keeps turning in sync to the C-motor on right turns and I am very confused. Could you please tell me if there's perhaps something wrong with the program or anything else? Thanks!
This is a great explanation on how to use Data Blocks in an EV3 Line Follower program. I like how you show the math involved, and how you superimpose the robot's turning action onto the EV3 program screen -- it really helps understand what the B-Motor and C-Motor are doing. Our FLL team has been using a simple switch-within-a-loop Line Follower program, but the robot "waddles" too much and the driving action is not very smooth like your program is. Keep posting these kinds of videos -- they are really helpful!
Hi blue angle u did a great job may i ask u question i do same programming but the problem is so slowly the robot how can robot be fast with ur program
Yes thanx i crease the c its work 😍but i have another question 🙈if u dont mind iwant to put another sensor how can i complete programming at the same program that u did
+بينه الكواري do you mean put another color sensor? You can use the same program, just make sure to change the color sensor port value to the one that you plugged in color sensor.
+Cachivaco C Hi, If you just want to follow the line, our program in the video only need one color sensor. For FLL game, we recommend you to have two color sensors to let the robot better understand its position.
Hi the robot can catch the line from the right edge of the line but what i want is i want my robot to catch the line from both side how can i do it thanks.
Hi Stav, you need to measure Reflected Light Intensity (RLI) to get your values (they might not be exactly as 78 and 8). Following video will help you on how to measure: EV3 Programming 1.8: How to measure Reflected Light Intensity (RLI) with color sensor @watch?v=a-Pw2aNvKpg
Hi, Thanks for sharing the beautiful program. I tried this one at home but once it exits the black line and white comes it starts spinning. This happens only during a left turn as it turns right when it sees white. Can you please guide me with this?
Hi Ayan, the c value controls the speed. If you watch from 7:04 she shows you how the robot goes too fast with a c value of 1, but goes slower with a c value of 0.4. Try adjust the c value.
Hi! Would this work if I needed the robot to follow a white line? Also, do you know a good program for following a white line up a board that is inclined 30 inches?
Thank you for sharing your time & expertise - very cool & easy to follow. What are the implications of putting the read variables on a second line to feed into motor power, vs. just appending them to the end of your original path? I didn't realize seperate paths could just dead end (like after feeding the motor) - thanks for that tip too!
Cool - thanks! Our team competed in our city elimination rounds yesterday here in Alaska - this is our first year and we only got 73 points on the table, but we had such a blast & will be trying again next year. Thanks again for sharing/explaining your techniques. You helped us be better than we would have been otherwise.
I suggest you get a better mic, at least a decent one, there was a lot of this, cukkkkkk in your mic. And thanks, this will help me out in my Robotics class, after a summer I forgot how to. I competed in my country's Robotic Olympics, but idk why. Ey Blue Angel, did you compete in the WRO?
Hi I need help with a program which is very complicated! I want you guys to teach me how do reverse the robot onto a black line and keep on moving forward? Please reply to this message and please make a video about this 🙏
Can anybody tell me how can ev3 detect randomly placed object in an arena and how ev3 will distinguish between fence and object? Beacon control is not allowed.
+Me “Dapaca” ow You can try move forward faster when the RLI value is in a certain range. When the RLI value is out of the range, let the robot follow the line again.
I tried following before: Follow the line for the fixed distance first. Then, just move forward with higher speed without following the line. If the robot see RLI value out of range (you need to test it to find appropriate value), let it follow the line again. You can include above steps in Loop block.
+Anna Mayer The c value controls the speed. If you watch from 7:04 she shows you how the robot goes too fast with a c value of 1, but goes slower with a c value of 0.4.
This should only take one sensor. It 'leans' against the line, veering towards it and turning away when it meets it. She explains this in more detail at 0:55
+alicia derby you can try to increase "c" value to make it go faster. Or, if the line is straight, the robot should be able to follow the line after certain distance, then, you can just let it go straight faster instead of following the line. For the white line, that's tricky. You can try to let the robot follow the black line with fixed distance until getting close to the white line, and then go forward until the RLI value is close to the RLI value of white.
+bob xatzibasiliou The 'c' value can be adjusted according to the task. If the robot is simply following a straight line, you can try increasing the 'c' value. Conversely, if the black strip (that the robot has to follow) is slightly curved, then the 'c' value has to be decreased.
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
Hi Emma! A big thank you from Belgium for your very usefull lessons! The kids in my classroom, P5, actually are learning to program the EV3 robot by watching your videos! We are very interested in your lessons for following the black line and recognizing the different colors. We are trying to combine the two ideas into our program for following a black line, then switch to the yellow line as a shortcut, and then switch back to the black line again. For My students It is a hard nut to crack... Could you help us? And a big thank you again for all the good work!
Olivier Dijkmans Hi, If you are able to install 2 color sensors, you could use 1 color sensor to follow the back line, then use the other color sensor to detect the yellow line, and following it. If you only have 1 color sensor, you can follow the black line for a certain distance (RLI mode), then you can just let the robot go straight (color detection mode) until it sees the color yellow, then it can follow the yellow line.
+Blue Angel My freind is having problems. I can't really get it to work. /: is it for INSIDE the line, or is it for following one? If its for following the inside then you should rename it. no offense. alos sorry if im strait foward, its just that we have a WORLD tournament coming soon and we can't get a program to work.
+The Luckycraft When you do propositional line following, the robot follows the edge of the line. whether you follow the right edge of the line or left edge of the line, it depends on whether you pass B-Power to B motor, and pass C-Power to C motor. If you want to follow another side of edge, try to pass B-Power to C motor, and pass C-Power to B motor. You can take a look "EV3 Programming 2.1: How to follow a line with sharp curve". In video 2.1, it shows you how to switch the edge. hope it helps.
hello Emma , I am Anan from Qatar & I really need ur help , my team and I entered a robot competition and we have some problems with Following a red curved line . so I was wondering if you could help us with it and we would really really appreciate it . and it would be nice if you give me your email address or facebook . thank you .
U are younger then me , but u are better then me
U did a very great job of creating this genius programme
Thanks for the tutorial. My 8 year old daughter was able to input the program and we got it working with a little trouble shooting... we had the Move Tank set to On for Rotations rather than just ON. So great to finally create something with the EV3 that works really well. We created a wavy line and it still followed it smoothly at 50% output to the motors. Thank you for your video!
+Peter Vree Sounds great! Glad the video helps. :-)
Thanks for your comment. We were having the same problem too and that's what it was. - Just change tank block from # rotations to ON.
I don't understand
Thanks so much for sharing, I had the team I was coaching watch this video. You did such a good job of explaining that the 5th graders were able to program themselves and even troubleshoot per our unique lighting challenges. You deserve a hug.
Thanks Kevin! Glad the video helps! :)
I'm impressed by the way you handle the theme, you make it awesome, keep that way and you'll go far
Thanks Sergio!
Hi Emma, You are an inspiration for my students. This was very helpful for us.
Thank you ACS Robotics! :)
Woooww the best video "following a line" I have ever seen on youtube..
Thanks Dener!
You did a very good job, Emma. I love blue angel robotics.
Thanks Alicia. :)
how to follow a line smoothly AND do left and right curves
Thank you! This was a great tutorial to follow!!!! By far the best I found on this task :) Thanks so much!!!
Glad it helps!
NO PROBLEM ALWAYS HAPPY TO HELP OUT
my robotdid not follow the line and it only moved if it was on the white but if it went on the black it would not move at all. plz hlp
Hi, how about check the setting of your loop block. Try set to "unlimited" loop, and see whether it works.
I had this too
Just calibrate the sensor and it will work
You guys are so good at robotics!
Thanks!
this doesn't work for me
:c
the robot just spin around the line
plz help us!
What's the RLI value for your white area and black line?
Question. Any ideas on how to make it follow the line faster?
+Sarah Lloyd Hi Sarah, you can try to increase "c" value to make it go faster.
Have you tried it?
Hi! how can I make this faster? because if I put a bigger value (like 1) the robot is not/following the line straightly.
If you have a long straight line, how about follow the line for a fixed distance, then simply move forward until the RLI value out of certain range? When there is a curve, the RLI value will be out of range, then use the follow the line program to get back on track.
Very nice job. Clear instructions and good explanations. Thanks
+Rob Cormier Thanks Rob!
+Blue Angel thanks for the video!!!!!!
Dude this is like...rad
hi, i have a problem, i folowed u`r instruction, got irl for black between 8 and 12 and for white between 62-72. so i`v made this program, but the robot isn`t folowing the line, hes turning to much and lose the line, then its start to spin in circles. what is the problem? do i need negative powers? the color sensor is situated between the wheels, exactly at the midle point where are the red parts of the motor
Stefan Cristian Hi Stefan, the negative power might help.
@098 2:04 Play nextPlay now
EV3 Programming 2.1: How to follow a line with sharp curve
great video👍 the program worked really well
thanks for the video. it desnt work with me. whats the problem?
didi you connect your mindstorm? Ow wait it has been 4 years, i guese you already have found the problem :(
Hi Emma! Is it possible to make the robot stop after it sees no black line
I need this for a project.
Or is it possible to make the robot stop when it sees no ground (exe) i put it on a table and it goes straight to the edge and stops?
MegaJustshutup this is tricky, you can try to let the line following program exit loop when the RLI value > you white area RLI, or RLI value = 0 (if the color sensor go out of the edge, the RLI value =0)Or, if it's acceptable, you can define the line following program to stop after certain distance.
can you please post a video on
the bot finding the lego remote.
i will :)
Amazing video! Wow, you are one talented and creative kid! Thanks SOOOO much!
how do I test for a quarter? That would be great.
how many color sensors do you need for this im looking for one with two sensor
Kobi Haig technically, you only need one color sensor to follow the line smoothly with this program. In a competition, you may want to install 2 color sensors to follow different lines based the position of the line...
this is a really helping. I built the robot and it seems to work very well in smooth curves but fails in sharp corners even if I reduce the speed. please help
Bikie Rapelang No worry, I will post a new video in several days to help on the sharp turn.
thanks
Bikie Rapelang We posted it :)
Thank you very much Blue Agel
Thank you for a wonderful explanation.
Great idea on having the 'C' variable in the equation.
You are very welcome Sumanoharan!
What if i wanted to use 2 color sensors on each side of the EV3 in order to follow a "road?"
Erik Art Hi Erik, how does the road looks like?
Just tape put on the floor, with some winding turns. Like a normal street road with 2 lines on either side of the ev3
Erik Art -Add Loop-Move Forward (Turn Moving Steering On)-If the left color sensor sees a black line (Use Switch Block)-Turn Right (Moving Tank)-If The Right Color Sensor sees a black line-then turn left-Loop back (Repeat The Process)
this program follows the left edge . what Changes should we do in order to follow the right edge?? plz help
When you do propositional line following, the robot follows the edge of the line. whether you follow the right edge of the line or left edge of the line, it depends on whether you pass B-Power to B motor, and pass C-Power to C motor. If you want to follow another side of edge, try to pass B-Power to C motor, and pass C-Power to B motor. You can take a look "EV3 Programming 2.1: How to follow a line with sharp curve". In video 2.1, it shows you how to switch the edge. hope it helps.
I have a problem now, I changed the C value once then changed it back but now the B-motor keeps turning in sync to the C-motor on right turns and I am very confused. Could you please tell me if there's perhaps something wrong with the program or anything else? Thanks!
Hello, My robot forward is backward. So how can I change the values in this program?
If that's the case, take a look EV3 Programming 2.6: How to follow a line backward smoothly
This is a great explanation on how to use Data Blocks in an EV3 Line Follower program. I like how you show the math involved, and how you superimpose the robot's turning action onto the EV3 program screen -- it really helps understand what the B-Motor and C-Motor are doing. Our FLL team has been using a simple switch-within-a-loop Line Follower program, but the robot "waddles" too much and the driving action is not very smooth like your program is. Keep posting these kinds of videos -- they are really helpful!
dluders Thanks! Glad our video helps! Good luck in the FLL Tournament.
Hi blue angle u did a great job may i ask u question i do same programming but the problem is so slowly the robot how can robot be fast with ur program
+بينه الكواري Have you tried to increase "c" value to make it go faster?
Yes thanx i crease the c its work 😍but i have another question 🙈if u dont mind iwant to put another sensor how can i complete programming at the same program that u did
+بينه الكواري do you mean put another color sensor? You can use the same program, just make sure to change the color sensor port value to the one that you plugged in color sensor.
+Blue Angel do i need use a switch block when i have 2 color sensor at the same programming that u did
Please make an updated version, as when i did this my robot just spun in circles and didn't follow the line at all.
You can try to reduce motor speed to avoid spin. If the speed is too fast, the robot doesn't have enough time to response when it's on the blackline.
Thank you for the tutorial. Does it work on sharp turns too?
EV3 Programming 2.1: How to follow a line with sharp curve
it should work on sharp turs but it might read the first black line so watch out for that
how many color sensors did you use in the robot?
+Cachivaco C Hi, If you just want to follow the line, our program in the video only need one color sensor. For FLL game, we recommend you to have two color sensors to let the robot better understand its position.
Very very much useful THANK you VERY MUCH
You are welcome!
your programming is superb....hope that you can post more...i learn more with u...hehehe:)
Thanks!
Hi the robot can catch the line from the right edge of the line but what i want is i want my robot to catch the line from both side how can i do it thanks.
How could I use this for following a green line?
Meris Yates You can replace the RLI value of black line with the value of green line.
Thank you! I don't know why I didn't realize that.
how did you get to the 78 and the 8 values
Hi Stav, you need to measure Reflected Light Intensity
(RLI) to get your values (they might not be exactly as 78 and 8).
Following video will help you on how to measure:
EV3 Programming
1.8: How to measure Reflected Light Intensity (RLI) with color sensor
@watch?v=a-Pw2aNvKpg
Hi, Thanks for sharing the beautiful program. I tried this one at home but once it exits the black line and white comes it starts spinning. This happens only during a left turn as it turns right when it sees white. Can you please guide me with this?
go for the middle of the black line, not at the right or left ;)
works great I subscribed but is there any way to make this program faster so the ev3 can move through the line in less time
Hi Ayan, the c value controls the speed. If you watch from 7:04 she shows you how the robot goes too fast with a c value of 1, but goes slower with a c value of 0.4. Try adjust the c value.
thank you
Thank you, Emma! This really helps! It is really complicated.
Lixia Fan Glad it helps! :)
Is there a way to make the robot a bit faster?
and which value "c" is needed to increase?
Hi Arslan, you need to increase both of the "c" values.
What do I change of my motors are A and B
If *
You would change it in the motor block to A and B, and then you would also change the variables to A-Power, and B-Power. Not too much of a change.
I am using a different bot and it is too heavy. how to account for this?
Make it lighter 😄
Hi! Would this work if I needed the robot to follow a white line? Also, do you know a good program for following a white line up a board that is inclined 30 inches?
Thank you for sharing your time & expertise - very cool & easy to follow. What are the implications of putting the read variables on a second line to feed into motor power, vs. just appending them to the end of your original path? I didn't realize seperate paths could just dead end (like after feeding the motor) - thanks for that tip too!
Hi Jerry, the purpose that I put the read variables on a second line is to make it easier for other people to read and understand. :)
Cool - thanks! Our team competed in our city elimination rounds yesterday here in Alaska - this is our first year and we only got 73 points on the table, but we had such a blast & will be trying again next year. Thanks again for sharing/explaining your techniques. You helped us be better than we would have been otherwise.
Glad our videos help Jerry. Check out our facebook next year, we published our engineering book there. Hope it helps you team as well.
hi :) my robot has to follow a red line what should I do ?
just bring in the red colour from the colours from the menu
how to make the robot follow dashed line?
+it teacher I honestly don't know, just see if it works.
+it teacher Hi did you found out how to make the robot follow dashed line ?
Thank you for the tutorial very clear instructions
+Ashton Kling (Ashprogamer) you are welcome Ashton!
+Blue Angel Any idea on how to make the robot faster while following line? With tutorial if possible thanks :-)
+Ashton Kling (Ashprogamer) Hi Ashton, you can try to increase "c" value to make it go faster with the program in the video.
your smart you know and thanks that helped me a lot with the math blocks
let me ask you a question
is this like the avoiding the line program
because my robot didn't even want to touch the line
oh made it wrong sorry
Thanks
Văn Tiến Đỗ You are welcome!
I suggest you get a better mic, at least a decent one, there was a lot of this, cukkkkkk in your mic. And thanks, this will help me out in my Robotics class, after a summer I forgot how to. I competed in my country's Robotic Olympics, but idk why. Ey Blue Angel, did you compete in the WRO?
This is very nice, I loved it,
good luck Blue Angel :)
Obaida Aloushi Thanks!
Welcome :) Blue Angel
could you please contact me?
why u didint try the block coding to see whether it was working or not
Hi I need help with a program which is very complicated! I want you guys to teach me how do reverse the robot onto a black line and keep on moving forward? Please reply to this message and please make a video about this 🙏
Can anybody tell me how can ev3 detect randomly placed object in an arena and how ev3 will distinguish between fence and object? Beacon control is not allowed.
Great job! The program worked perfectly.
+JS Great! Glad it helps.
after troubleshooting my ev3 i found that the port on my color sensor block did not match the port i connected it to
Is it possible it make it faster, while keeping it smooth?
+Me “Dapaca” ow You can try move forward faster when the RLI value is in a certain range. When the RLI value is out of the range, let the robot follow the line again.
+Blue Angel how
I tried following before: Follow the line for the fixed distance first. Then, just move forward with higher speed without following the line. If the robot see RLI value out of range (you need to test it to find appropriate value), let it follow the line again. You can include above steps in Loop block.
Errrr...I only have 1 colour sensor. Could you do a video with 1 colour sensor?
I installed 2 color sensors but this line following program only uses 1 color sensor.
I in a robotics class and as a test, my robot has to go through a maze.Can you help me?
this is really helpful nice and clear instructions... keep it up >.
+Ömer Yahya Darkstone Thanks Omer!
thanks for the support
thanks a lot my friend you saved me
Why do you multiply by 1?
+Anna Mayer Or what is c used for?
+Anna Mayer The c value controls the speed. If you watch from 7:04 she shows you how the robot goes too fast with a c value of 1, but goes slower with a c value of 0.4.
+Cookies713 Thanks Cookies713 :-)
Thank you very much, this tutorial was very helpful! You give very good and clear instructions.~Em
+SydPaigeEm You are welcome!
Wonderfully done! Thank you!
Thanks Krish!
Can you make a vid where you are using one light sensor? I only have one and my robot was all over the place that would help a lot ;)
This should only take one sensor. It 'leans' against the line, veering towards it and turning away when it meets it. She explains this in more detail at 0:55
same :)
Thanks, it was very helpful.
Joseph Zhang Thanks! Glad the videos help. :)
woah nice
look Joeseph is thankful!
OMG I take robotics at Harker and this is easy,,, light censor brick leads the waaaayy!!!!
ofc
LOVE this video. Thank you so much!
+Kristi Felder Glad it helps Kristi!
Does the line have to be straight?
Thank you, Emma! You are good!
hugo mello passos Thanks! Glad it helps. :)
what hapens wen the line is blue?
when the line is blue, you can measure the RLI value of blue line to replace the RLI value of black line in the program.
how do you make it go faster and also make it stop at a white line if it is following a black line?
+alicia derby you can try to increase "c" value to make it go faster. Or, if the line is straight, the robot should be able to follow the line after certain distance, then, you can just let it go straight faster instead of following the line. For the white line, that's tricky. You can try to let the robot follow the black line with fixed distance until getting close to the white line, and then go forward until the RLI value is close to the RLI value of white.
+Blue Angel I love your videos. But if as you say we increase c wont it be more jaggy??
+bob xatzibasiliou The 'c' value can be adjusted according to the task. If the robot is simply following a straight line, you can try increasing the 'c' value. Conversely, if the black strip (that the robot has to follow) is slightly curved, then the 'c' value has to be decreased.
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
Hi Emma! A big thank you from Belgium for your very usefull lessons! The kids in my classroom, P5, actually are learning to program the EV3 robot by watching your videos! We are very interested in your lessons for following the black line and recognizing the different colors. We are trying to combine the two ideas into our program for following a black line, then switch to the yellow line as a shortcut, and then switch back to the black line again. For My students It is a hard nut to crack... Could you help us? And a big thank you again for all the good work!
Olivier Dijkmans Hi, If you are able to install 2 color sensors, you could use 1 color sensor to follow the back line, then use the other color sensor to detect the yellow line, and following it. If you only have 1 color sensor, you can follow the black line for a certain distance (RLI mode), then you can just let the robot go straight (color detection mode) until it sees the color yellow, then it can follow the yellow line.
Are you from Singapore?
I take it back works perfectly thank you
+Kenrick Nembhard Glad it works for you. :-)
Your video was very helpful have you got the information in text format? so I can print it and give to students?
+Kenrick Nembhard The text is in "cc".
fookin doesnt
HOW CAN I SPEED IT UP MY INTENSITY IS TOO MUCH LOW
You might want to reset the color sensor: menu "Calibrate"->"Reflected Light Intensity->Reset.
I need to download right.
You did a great job!
Thanks Charlie!
You have more subs than my teacher
It's so helpful! thanks!
Welcome Jonathan.
working smoothly! Thanks!
+ღSingstress AJღ Great!
Excellent video. :)
Thanks Rob!
This is great, I will subscribe this.
And it works for me, too!
this is complicated, where can I see how wvrything works?
Zdravko Malić Hi Zdravko, the whole video is to explain how everything works. if you want to see the final code, see the video at 7:30 minutes.
ok, tenkju
Merci beaucoup pour cette video très simple mais très utile
Glad the video helps!
There really is an easier way, and you can program it in less than 1 minute
What is the easier way?
I agree with you
Good work!
thanks for the videos
James Lin You are welcome James!
Thanks this help a lot!!!
dude VERY COOL MAN.
+The Luckycraft Thanks!
+Blue Angel :D
+Blue Angel My freind is having problems. I can't really get it to work. /: is it for INSIDE the line, or is it for following one? If its for following the inside then you should rename it. no offense. alos sorry if im strait foward, its just that we have a WORLD tournament coming soon and we can't get a program to work.
+The Luckycraft When you do propositional line following, the robot follows the edge of the line. whether you follow the right edge of the line or left edge of the line, it depends on whether you pass B-Power to B motor, and pass C-Power to C motor. If you want to follow another side of edge, try to pass B-Power to C motor, and pass C-Power to B motor. You can take a look "EV3 Programming 2.1: How to follow a line with sharp curve". In video 2.1, it shows you how to switch the edge. hope it helps.
uhh...
hello Emma , I am Anan from Qatar & I really need ur help , my team and I entered a robot competition and we have some problems with Following a red curved line .
so I was wondering if you could help us with it and we would really really appreciate it .
and it would be nice if you give me your email address or facebook .
thank you .
im from qatar
lol
For a robot with caterpillar treads or wheels.
wow hank, that was really helpful :)
Glad it helps!
10/10 would copy and paste again
Great video!!!!!
+Bob Bobber Thanks Bob!
Model name?!?!?!???
+Nerijus Barisauskas Lego Mindstorms EV3