The turf robot

entropie · 09-21-2008, 11:28 AM

Well that is fun

It moves via a GPS protocol. Because of GPS being slow it uses infrared diodes to measure a round circle around itself to see possible dangers, like a pond for example. To perfect the navigation it has a built-in induction coil that works within a boundary loop and works as a reference measurement set.

The trimmer is build pretty easy, as shown here:

http://www.rad-ro.de/Rasenrobo/IMGP1223.jpg

Furthermore it uses incremental wheel position detection, so it can accurately turn its wheels to a 20 degree accuracy.

http://www.rad-ro.de/Rasenrobo/IMGP1224.jpg

What do you think ? I just love it

Jack Flak · 09-21-2008, 11:35 AM

No lasers?

entropie · 09-21-2008, 11:42 AM

It probably still needs to get the license from the U.S.E. on nuclear warheads that by then can be implemented

Here is a vid of the turf-o-matic in action

http://www.rad-ro.de/Rasenrobo/Imgp.avi

Geoff · 09-21-2008, 01:46 PM

Needs something more accurate than GPS I expect. How about a specially trained hamster to watch out for obstacles?

entropie · 09-21-2008, 02:07 PM

xD yeah a Hamster with a wodden leg and a captains hat

No it has not only GPS. You lay copper wire around the area you want it to cut. And then you let a little current flow through it (should be isolated naturally). When one of the four induction coils on the edges passes over the copper, its circuit reverses polarity and the controlling unit is informed.

It is pretty tough to build a good navigation. An optical one is to diffcult and in danger of distortion on the mechanical site. GPS is as said to inaccurate for a fast reaction time...

The simplest one would be to have a not so fine calibrated diode array to detect green grass

or respectively the hamster

Jack Flak · 09-21-2008, 02:11 PM

Quote:

Originally Posted by entropie

You lay copper wire around the area you want it to cut. And then you let a little current flow through it (should be isolated naturally).

"You may now have current flow through you, copper wire!"

ygolo · 09-21-2008, 07:49 PM

Quote:

Originally Posted by entropie

What do you think ? I just love it

Very cool!

Are you going to use it in a lawn mowing business or just to mow your own lawn?

Incidentally, I used to be on my school's Autonomous Vehicle Team.

They have really perfected the art of combining laser-range-finders and a camera with vision program (to stay withing two painted white lines). The vehicle I worked on is no longer on the list of vehicles pictured. It had ultra-sound instead of a laser-range-finder. We generally found that the range-finders were more reliable and usable.

VT Autonomous Vehicle Team

entropie · 09-22-2008, 08:40 AM

Ah, now I understand what Jack meant by "no Lasers"

. I am used to the word "optical sensors", Laser I combine with StarTrek

.

The thing of the project was to build from a low budget and to make it universally applicable. You can just lay out the induction ring on every form of area and it works within it. The GPS thing makes it just expensive and is pure luxus.

I will have a look into your idea of a solution. I am just on a run, right now.

See you later

entropie · 10-28-2008, 04:24 PM

My turf-o-bot is getting shape

Finished the gearbox + wheels today. Picture is of bad quality sry for that

09-21-2008, 11:28 AM	#1 (permalink)
entropie Liasion man in Amsterdam Join Date: Apr 2008 Type: entq Location: Bochum, Germany Posts: 5,205	The turf robot Well that is fun It moves via a GPS protocol. Because of GPS being slow it uses infrared diodes to measure a round circle around itself to see possible dangers, like a pond for example. To perfect the navigation it has a built-in induction coil that works within a boundary loop and works as a reference measurement set. The trimmer is build pretty easy, as shown here: http://www.rad-ro.de/Rasenrobo/IMGP1223.jpg Furthermore it uses incremental wheel position detection, so it can accurately turn its wheels to a 20 degree accuracy. http://www.rad-ro.de/Rasenrobo/IMGP1224.jpg What do you think ? I just love it __________________ pocket estj Enneagram: 3w4 "Now is the dramatic moment of fate, Watson, when you hear a step upon the stair which is walking into your life, and you know not whether for good or ill." ~Sir Arthur Conan Doyle [Mind.in.a.Box] -------

09-21-2008, 11:42 AM	#3 (permalink)
entropie Liasion man in Amsterdam Join Date: Apr 2008 Type: entq Location: Bochum, Germany Posts: 5,205	It probably still needs to get the license from the U.S.E. on nuclear warheads that by then can be implemented Here is a vid of the turf-o-matic in action http://www.rad-ro.de/Rasenrobo/Imgp.avi __________________ pocket estj Enneagram: 3w4 "Now is the dramatic moment of fate, Watson, when you hear a step upon the stair which is walking into your life, and you know not whether for good or ill." ~Sir Arthur Conan Doyle [Mind.in.a.Box] -------

09-21-2008, 02:07 PM	#5 (permalink)
entropie Liasion man in Amsterdam Join Date: Apr 2008 Type: entq Location: Bochum, Germany Posts: 5,205	xD yeah a Hamster with a wodden leg and a captains hat No it has not only GPS. You lay copper wire around the area you want it to cut. And then you let a little current flow through it (should be isolated naturally). When one of the four induction coils on the edges passes over the copper, its circuit reverses polarity and the controlling unit is informed. It is pretty tough to build a good navigation. An optical one is to diffcult and in danger of distortion on the mechanical site. GPS is as said to inaccurate for a fast reaction time... The simplest one would be to have a not so fine calibrated diode array to detect green grass or respectively the hamster __________________ pocket estj Enneagram: 3w4 "Now is the dramatic moment of fate, Watson, when you hear a step upon the stair which is walking into your life, and you know not whether for good or ill." ~Sir Arthur Conan Doyle [Mind.in.a.Box] -------

09-22-2008, 08:40 AM	#8 (permalink)
entropie Liasion man in Amsterdam Join Date: Apr 2008 Type: entq Location: Bochum, Germany Posts: 5,205	Ah, now I understand what Jack meant by "no Lasers" . I am used to the word "optical sensors", Laser I combine with StarTrek . The thing of the project was to build from a low budget and to make it universally applicable. You can just lay out the induction ring on every form of area and it works within it. The GPS thing makes it just expensive and is pure luxus. I will have a look into your idea of a solution. I am just on a run, right now. See you later __________________ pocket estj Enneagram: 3w4 "Now is the dramatic moment of fate, Watson, when you hear a step upon the stair which is walking into your life, and you know not whether for good or ill." ~Sir Arthur Conan Doyle [Mind.in.a.Box] -------

10-28-2008, 04:24 PM	#9 (permalink)
entropie Liasion man in Amsterdam Join Date: Apr 2008 Type: entq Location: Bochum, Germany Posts: 5,205	My turf-o-bot is getting shape Finished the gearbox + wheels today. Picture is of bad quality sry for that __________________ pocket estj Enneagram: 3w4 "Now is the dramatic moment of fate, Watson, when you hear a step upon the stair which is walking into your life, and you know not whether for good or ill." ~Sir Arthur Conan Doyle [Mind.in.a.Box] -------

09-21-2008, 11:35 AM	#2 (permalink)
Jack Flak Banned Join Date: Jul 2008 Type: INTP Location: The Everlasting Sky Posts: 9,359	No lasers?

09-21-2008, 01:46 PM	#4 (permalink)
Geoff Lallygag Moderator Join Date: Apr 2007 Type: INXP Location: Southern England Posts: 4,603	Needs something more accurate than GPS I expect. How about a specially trained hamster to watch out for obstacles?

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