Categories: RoboCommunity Lounge
Hey,
Since I cannot wait for the release of the Rovio, I decided to make one myself with the Lego Mindstorm NXT robot kit. I got the idea of this not too long ago and I am finally going to do it. I plan on giving it the ability to move on its own and it can follow the commands you give it via bluetooth. I have a mini camera smaller than a nerds candy box that I plan on mounting somewhere on it so I can watch live video as it wanders around the house. I am going to give it two light sensors so it can follow a line around my room with duct tape or I can make a path around the house with it so it can survey the area. I am also going to use the touch and ultra sonic sensors to give it a degree of wall avoidance. I am not the best at programming but I think I can figure this out.
I am going to order some omni wheels online. This is what I had in mind. They do not cost too much and I think they will work nicely. I just have to get them to work with the lego mindstorm motors, I will take pictures of them when they come in so you get a better idea of what they look like. http://www.omniwheel.com/cgi-bin/plugins/MivaEmpresas/miva?plugins/MivaMerchants/merchant.mvc+Screen=PROD&Store_Code=KCWD&Product_Code=RW9&Category_Code=Omniwheel
Please check out the gallery and read the captions under them.
I think it will be a cool thing to have around. After I get bored with this robot, I plan on taking it apart and building a more advaced one. One with three wheels that all turn at once to move the robot in different directions. Instead of three motors, I would only have to use two but this is more advanced and I want to get into this first before I go deeper into it.
Administrator
United StatesThis is great, Billboard - thanks for posting on your upcoming project. Looking forward to seeing your results, and good luck.
I think we'd all like to see more pics and video, too, as it comes along!
Peter Redmer
Administrator
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I am going to start it here next week. I need to get the money to purchase the wheels before I start the build so I know how I am going to transfer the wheels to lego.
Member
Nelson, New ZealandI look forward to seeing this project Billboard, good luck.
People yearn after this robotic dream, but you can't strip your life of all meaning, emotion and feeling and expect to function.
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Member
Sydney, AustraliaYou guys are incredible. These kind of things are way beyond me! Way to go.
I started with 2 robots but before I knew it, well, it's a disease I tell you.
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Nelson, New Zealandidrum289: I bet you could do it if you really tried. Have a go, Nothing lost.
People yearn after this robotic dream, but you can't strip your life of all meaning, emotion and feeling and expect to function.
Robotic madness http://robosapienv2-4mem8.page.tl/
Member
Abilene Texas, United StatesThe Lego Mindstorms NXT was one of the non-WowWee items that I was VERY interested in. Maybe I'm still interested, but...
... I saw a couple of posts (customer reviews, don't remember where I saw them, Amazon maybe) - to the effect that the 'brick' has a relatively limited memory capacity. Very short, very simple programs?
Maybe a NXT owner could clarify?
(a bit off topic, sorry); The other major non-WowWee product that I was interested in was the i-Sobot. Downloaded the manual, read everything that I could find on it...
... no collision avoidance, apparantly. Apparantly the only environmental sensor it has is the Gyro and the Speech Recognition chip. Perhaps if there was an i-SeeingEyeDogBot....
JeffTX said: The Lego Mindstorms NXT was one of the non-WowWee items that I was VERY interested in. Maybe I'm still interested, but... ... I saw a couple of posts (customer reviews, don't remember where I saw them, Amazon maybe) - to the effect that the 'brick' has a relatively limited memory capacity. Very short, very simple programs? Maybe a NXT owner could clarify? (a bit off topic, sorry); The other major non-WowWee product that I was interested in was the i-Sobot. Downloaded the manual, read everything that I could find on it... ... no collision avoidance, apparantly. Apparantly the only environmental sensor it has is the Gyro and the Speech Recognition chip. Perhaps if there was an i-SeeingEyeDogBot....
I had about 12 programs with about 60 movements in each and I had enough space for more. The memory never gave me a problem. I need to buy the wheels still.
Man, I need some money. :/
Member
Abilene Texas, United StatesBillboard said:JeffTX said: The Lego Mindstorms NXT was one of the non-WowWee items that I was VERY interested in. Maybe I'm still interested, but... ... I saw a couple of posts (customer reviews, don't remember where I saw them, Amazon maybe) - to the effect that the 'brick' has a relatively limited memory capacity. Very short, very simple programs? Maybe a NXT owner could clarify? (a bit off topic, sorry); The other major non-WowWee product that I was interested in was the i-Sobot. Downloaded the manual, read everything that I could find on it... ... no collision avoidance, apparantly. Apparantly the only environmental sensor it has is the Gyro and the Speech Recognition chip. Perhaps if there was an i-SeeingEyeDogBot....I had about 12 programs with about 60 movements in each and I had enough space for more. The memory never gave me a problem. I need to buy the wheels still. Man, I need some money. :/
Yes - sorry - I did some research. At one point, Lego improved the kit. Something they did 'released about 80% more RAM for the user'.
The review that I read (I think it was a comment on Amazon or someplace) must have been very old.
Moderator
Madison WI, United StatesI have a couple of iSobots now, and they are fairly limited as far as programmability. I'd consider replacing the controller board with a different MCU but you need to have 5 serial ports since the servos on each limb are on a separate bus.
I like NXT too, and the three wheel omniwheel design should be great. My son built a 4 motor hamster, which is a problem because the NXT brick only has 3 motor ports. I can get a motor multiplexor but that's another $40 or so.
Can't wait to see your construction, Billboard! You could still work on the motor program for directional movements without having the wheels. Are you using one of the other C programs for the NXT, or the lego mindstorms software?
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Member
Nelson, New ZealandI like NXT, I have two sets and a lot of Technics, I wish I had more time to construct projects with it. I have tried both mindstorm and Robolab ver2.9 here is a list that you can use.
http://www.teamhassenplug.org/NXT/NXTSoftware.html
People yearn after this robotic dream, but you can't strip your life of all meaning, emotion and feeling and expect to function.
Robotic madness http://robosapienv2-4mem8.page.tl/
milw said: I have a couple of iSobots now, and they are fairly limited as far as programmability. I'd consider replacing the controller board with a different MCU but you need to have 5 serial ports since the servos on each limb are on a separate bus. I like NXT too, and the three wheel omniwheel design should be great. My son built a 4 motor hamster, which is a problem because the NXT brick only has 3 motor ports. I can get a motor multiplexor but that's another $40 or so. Can't wait to see your construction, Billboard! You could still work on the motor program for directional movements without having the wheels. Are you using one of the other C programs for the NXT, or the lego mindstorms software?
Im gonna use the software that game in the kit. I plan on making it so it avoids walls so I got to plan something like making the ultrasonic be like when it runs toward something, it will wait until it get a foot away, the robot will then backup a little bit then it will turn around so it faces the other way. I am also going to get a blue tooth thing for the laptop so I can control it that way. I dont like programming before I have the robot. I do not have my plan on how to get the motors in a certain way. Ill let you see my programs if you would like when I start and If I could, ask for some help if I need it.
visit:
LEGO Omniwheel Robot
i successfully replaced old motors with 3 nxt servo motors (i will update the image) ;)
since i control the servos with a custom avr board, somewhere i found a schematic of the intenals (servo motor) - but i cant remember the link
Member
Jacksonville, United Statesya the LEGO Omniwheel Robot is pretty cool, you don't even have to buy the wheel you make them out of LEGO wheels, Neat concept I think. also lego has all the schematic for the NXT and its components right on there site for free, What a cool idea that they made the brick an Open-Source-Program unit. This opens the doors for anything you can imagine.
Jax
GWJax, To Hack and make mods on robots is a life style and comes natural and not by choice. If a robot has a screw to open it then it must be opened!
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