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You noticed! Thanks for the encouragement!

Thanks for the feedback, it's very good to know the videos are appreciated!

It did take me a while! Thanks for your encouragement. Best regards Paul

Thanks for your feedback! Best regards Paul

Please send your email address to pablocutler@gmail.com. I will then mail the pdf file. About your question on the three types of ramp, the advantage of using ramps is to be able to drive a defined distance more accurately. If you just start from zero speed and go to full speed, you will have wheel slip maybe different on each wheel. If you stop abruptly you will have some overshoot, maybe more on one side than the other so you will get some rotation. It is just more controlled to use ramps! Best regards

Hi Marco Thanks for your comments! I only have direct experience of Spike Prime. I am a retired electrical engineer and discovered two years ago that my neighbour's children had entered a World Robot Olympiad competition. It didn't take long for me to get involved. The channel keeps my gray matter active! I find Lego Spike Prime to be great for young people to get started on robotics and the scratch programming is fun to use. A quick search on the internet shows that there are many other systems available, some of them quite advanced. Lego is very well established but clearly limited in its capabilities. It is of course an interesting challenge to find good solutions with limited resources. I am sorry I can't help you further. Best regards Paul Cutler

Hi! I am not sure exactly what you mean, could you explain in more detail. I will do my best to help you!

@why-not-bot it was to instal the extension of more movements, I found that it add it below😅, also thank you and good video :D

Now I see what you mean! I am pleased that you found it!

Hi, send me your email address and I will send the file. My address is pablocutler@gmail.com

Thanks for your comments! My email is pablocutler@gmail.com

👌, Thanks

I could maybe make some photos!

@@why-not-bot yes please

Could you share with me please

Hi there, In a day or two I will have a new video ready which shows a slightly modified version of the robot which could grab four house elements. It's not a full description of how to build the robot but shows some of the details. I always think that part of the fun is making your own design! Thanks for watching my channel. Paul

I help a team here in Switzerland!

Thanks for your comments!

Hi, thanks for asking about Pybricks. I don't know much about it, but have had a look online and it seems to be very interesting. I should definitely look at it, do you use it?

@why-not-bot Yes, i started to use it😁

I am glad you found the video useful!

I am glad you found the video helpful!

Thanks for your kind words!

Hi, the value 2.86 depends on the diameter of the robot wheels and the distance between the two driving wheels. My robot has wheels of 5.6 cm diameter and distance between the wheels of 16 cm. The ratio 16/5.6 is 2.86. To turn the robot through 360 degrees the wheels will have to move by 16π cm. If you turn the motor through 360 degrees the wheels only move by 5.6π cm so you have to multiply by the ratio. I hope this explains it!

@@why-not-bot Thank you so much

I am pleased I could help you!

​@@why-not-bot Excuse me for the second question, Sir. At minute 6:27, we can see how the robot slightly veers to the left when the junction is of that type. How could this be corrected? Perhaps by having it follow the line on the right and then, after completing the turn, making it follow the line on the left? Thank you.

@@davidezeppa384 Hi, thanks for your question. I have looked closely at the video and see what you mean. I should have followed the right side of the line here, you are correct. The kick to the left happens after the move 5.5 cm block, this block is not a line following function, just a basic movement block so I do not see a reason for the kick to the left. I still have the robot so I can look into this although it will be a few days as I am away from home at the moment. It might just be the first part of the spin turn to the left which is the next block executed! Thanks for your feedback

Hi, thanks for your comments! I don't have any instructions for making the robot, but I might make a video on the lift mechanism sometime soon.

@@why-not-bot that's great, thanks again

Wow, both models are amazing! How many motors and sensors you are using?

@leongkiungwah2653 Both models use two motors for moving the robot, one sensor for line following and one sensor to read the colours of objects. The WRO2022 robot has one motor to pick up the laundry and one to drop the laundry. The other robot has one motor to grab the blocks and one to raise/lower them. It would be great if Spike Prime had 2 more ports for sensors/motors!

Yea , it’s true . Do you think that the next version of spike will come with eight ports 😂😂

Thanks very much, I appreciate your feedback!!

Hi There I will do my best to explain the value of 8. We calculate the distance travelled as Adegrees/Degrees. This varies from 0 to 1 over the distance we want to travel. The S-curve equation I have used has an input of minus infinity to plus infinity for an output of zero to one. If we use an input of minus 4 to plus 4 we use about 99% of the curve which is good enough for our ramp. So before we can use the S-ramp curve we have to convert the signal which varies from 0 to 1 into -4 to plus 4. To do this I multiply by 8 and then subtract 4. I hope I have managed to explain it! Best regards Paul

@ thank you that does explain it!!!

Hi There! I will need more information to be able to help you, can you email a photo of the line you are trying to follow? Also, have I understood correctly that you are using just one light sensor for the line follower? Is it a proportional line follower or fast/slow?

@@why-not-bot it's line proportional whit sensor in B. then senson in A is in color mode and sees green with counting, the second time it commands to go back. so he resumes the line follower until he reaches where everything is white.

@@why-not-botit is a proportional line whit sensor in B. then the sensor in A is in color mode and sees green with counting, the second time it commands to go back. so he resumes the line follower until he reaches where everything is white. How can I send a photo or video?

My email is pablocutler@gmail.com Maybe a photo of your line follower coding as well!

Hi Timothy 20 is the factor you need to convert cm to degrees. I measured the wheel diameter as 5.6 cm, this gives a circumference of 17.59 cm. One wheel rotation is therefore 360 degrees and 17.59 cm. The factor I need is in theory 360 divided by 17.59 which is 20.46. I then programmed the robot to drive 50cm with this factor and measured the distance travelled. I had to slightly modify the factor to give me the correct result. Theory and practice are usually slightly different! The sources of error are perhaps my measurement of the wheel diameter, some wheel slip and some overshoot at the end of the 50cm run which would be speed dependent. Factor 20 gave good results and is a nice round number. I hope this answers your question, thanks for your interest!

Very close to me! I live in Germany near the Lake of Constance!

Very close! I am in the Zürich area!

@why-not-bot nice! i live near Friedrichshafen.

Hi, thanks for your comments! It's true, you don't see much use of force sensors in competitions, you could use one to tell when you have reached the side of the table for example. Is this what you have in mind? Have you tried using one yourself?

@@why-not-bot yeah, without the touch/force sensor, you have to measure the distance to reach a object or destination point (because there's no line lead to that object). Is this the technique you usually use in the competition? This requires multiple tries and fine tune, doesn't it?

@@why-not-bot do you have a video about motor simulation? e.g one motor for many actions likes grab, lift ...

Hi again I have sometimes used one motor to do two things like lift, grab etc. It is not easy to do more than two things because both operate at the same time and both will have to have about the same number of motor rotations. It is something I have often thought about, if I have any new ideas I will definitely make a video!

@@why-not-bot thanks in advance. may I ask if you're located in Australia?

Thanks for your comment! I also think now that the double wheels are better, the robot has to move fairly heavy boats around and the grip will be better. There will be less slip and uncertainty in the movements. I am not sure about a frame around the wheels, do you have experience of this?

Thanks for your kind words! I was hoping the video shows enough information to build the robot, a large part of the enjoyment is making your own design - it doesn't have to be identical!

I am sorry but I don't understand what you mean! The video is about optimising a line follower.

@@kwingdragon5218 Hi KD I need more Information to help you! Send a video or program to my email pablocutler@gmail.com

Can you give me some more information on the problem?

@@why-not-bot Like the robot can't rotate in a curve line if it detects and it can't also do sharp turns

Tkwingdragon5218 To do sharp turns you probably need a turn my word where you specify the angle you want to turn. Send me a video or program and maybe I can help!

Sended already ​@@why-not-bot

It is just a conventional proportional line follower! Is this what you want to see?

@@why-not-bot yesss pleaseee 🙏🏾

what I mean by a unit is the distance between 2 lego studs which is 8mm. So 2 studs is 16mm. You could mount a sensor at for example 1.5 studs height, but you would have to make some kind of adjustable sliding mechanism rather than just fitting the sensor normally.

@@why-not-bot can you make a video on how to create an array

I am looking into this!

I would be interested to see what improvement you achieved! Did you have a delay time in your PD algorithm to define how many times per second you execute it?

@@why-not-bot I didn't put a delay time

could I look at your PD algorithm? my email is pablocutler@gmail.com

Thanks for watching, yes just one sensor is used there.

It is a really simple robot, just the hub mounted on a blue frame with a motor on each side and a castor ball back and front!

Which challenge do you mean? WRO?

@@why-not-bot Yes

@@why-not-bot yes

@@why-not-bot Yes, is it possible?

I did use some list features in the WRO2022 senior (hospital wards) to memorise the laundry, is this the kind of thing you are interested in?

Hi Gretchen, I hope to be more active on the channel now and will soon make some new videos! Thanks for your interest.

Hi Gretchen I am not using python, just the scratch blocks. You can do quite a lot with them especially if you develop some good My Blocks! Best regards Paul

I will do a new video soon with more information on the robot and the programming.

I hope to be more active on the channel and will do a new video soon.

@@why-not-bot keep up the good work

Thanks for the encouragement, I will do my best!

Thanks for the encouragement!

Hi! Unfortunately there are no building instructions, I just made it up as I tried to carry out the tasks! I have quite a few photos which I will make into a video .Best regards!

Hi Omer I do not have any building instructions as I just built the robot piece by piece to carry out the tasks required. I have quite a few photos which I could make into a video and put on UA-cam. Best regards

You are correct it would be nice to have two sensors, but as we know, spike only has 6 ports. I used the line follower for a defined distance so that I could stop using it just before a junction and switch to yaw control over the junction and avoid a bump. If I want to stop at a junction, I stop using the line follower just before the junction and switch to yaw control. I then use the color sensor to detect the junction and stop. This is better than using line follow up to the junction as the junction will disturb the line follower.

I only have photos from various angles, I could put them in a video and upload it!

Hi, I don't have details on how to build the robot I just developed it and modified it as I tried to carry out the tasks. I have taken photos and will make a video with them soon!

I intend to be more active on the channel now, thanky for your interest!

I intend to be more active on the channel now, thanks for your interest!