Author Topic: WAbot (Read 7273 times)

Ziga · « **on:** January 01, 2008, 01:02:05 PM »

Hello!
I wanna make a wall avoiding robot. It would be my first robot, and i want it to avoid walls offcourse.

I need to know :

1. what materials i need to make it

2. how much it costs

3. a little bit help by how to make it.

If it isn't too hard (because it's my first robot) i would like to give a drill on it

But that isn't important. Important is that it would avoid walls.

Thanks to anyone who will help me

airman00 · « **Reply #1 on:** January 01, 2008, 01:40:14 PM »

Its not so hard

You first need to decide whether you want noncontact wall avoidance or contact avoidance

noncontact is harder and more expensive but you'll reuse the concepts learned from building that robot later on
search around the forum for wall avoiding and obstacle avoidance

ill have a better reply tomorow when i go back on the forum, im tired now

Ziga · « **Reply #2 on:** January 01, 2008, 02:29:51 PM »

Thank you

Anyway, i was thinking more about noncontact
it's much better that way

cooldog · « **Reply #3 on:** January 01, 2008, 02:40:18 PM »

the $50 robot uses photocells and when pointing at the right angle will double as wall avoidence pecause of the shadows

Ziga · « **Reply #4 on:** January 01, 2008, 02:57:58 PM »

Well, i was thinking more about somathing what would be designed by me and things like that.

hazzer123 · « **Reply #5 on:** January 01, 2008, 03:33:57 PM »

Well there are 2 of these non-contact robots on this forum that i know of. The first one is ultra low budget. The second cost a bit.

http://www.societyofrobots.com/robotforum/index.php?topic=1304.0
http://www.societyofrobots.com/robotforum/index.php?topic=1173.0

Maybe these will give you an idea.
Hazzer

Ziga · « **Reply #6 on:** January 01, 2008, 03:51:57 PM »

Yeah i was watching Walbot alredy. It's cool, but it costs around 150 $.

Rebelgium · « **Reply #7 on:** January 01, 2008, 04:55:06 PM »

Quote from: hazzer123 on January 01, 2008, 03:33:57 PM

Well there are 2 of these non-contact robots on this forum that i know of. The first one is ultra low budget. The second cost a bit.

http://www.societyofrobots.com/robotforum/index.php?topic=1173.0
http://www.societyofrobots.com/robotforum/index.php?topic=1173.0

Maybe these will give you an idea.
Hazzer

Those are two identical links

hazzer123 · « **Reply #8 on:** January 01, 2008, 05:13:00 PM »

haha

Oops

here is the real second link - http://www.societyofrobots.com/robotforum/index.php?topic=1304.0

i edited the original post aswell.

Ziga · « **Reply #9 on:** January 02, 2008, 03:05:43 AM »

Nice

How much does it cost for you to make one? and what materials you need?

Ziga · « **Reply #10 on:** January 02, 2008, 02:41:19 PM »

No answers?

ed1380 · « **Reply #11 on:** January 02, 2008, 02:48:20 PM »

make a photovore ($50 robot) and aim the photosensors at teh wall

hazzer123 · « **Reply #12 on:** January 02, 2008, 02:55:21 PM »

It cost me about £20.

All i bought were the servos (£7 each HS-311), IR LEDs(20p each), phototransistors(20p each), resistors (10 for 40p), quartz crystal oscillator(80p), prototyping board (£4) and capacitors(~£1).

The robot body was made using the case from an old floppy drive, the microcontoller was ordered from microchips sample site, i allready had a programmer (but these are really cheap to make), the wheels were made from cut out cardboard, battery from an old RC car... i think thats it.

Yeah its really cheap. I reckon its harder than the $50 robot though, since the microcontroller is just a chip. There is no board that it comes with so you have to sort out the oscillator, power, possibly UART all by yourself. I programmed mine in assembly which was an experience

but i recommend using a c compiler (PICC Lite or C18).

Ermmm yeah i think thats it

Hazzer123

Ziga · « **Reply #13 on:** January 03, 2008, 11:09:00 AM »

Well, anyway - i also wonder how to program a robot

You need to write code or what?

hazzer123 · « **Reply #14 on:** January 03, 2008, 01:12:15 PM »

I used this tutorial to learn how to write in assembly http://www.mstracey.btinternet.co.uk/pictutorial/picmain.htm

I used this to learn c http://www.amazon.co.uk/C-Programming-Language-2nd/dp/0131103628/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1199387474&sr=8-1

Hazzer

Ziga · « **Reply #15 on:** January 03, 2008, 01:41:13 PM »

Thanks

Oh and which program you use by design?

hazzer123 · « **Reply #16 on:** January 03, 2008, 01:59:45 PM »

For writing in assembly i used Vim Text Editor
Although i could have used Microchip MPLAB IDE.

I didn't design the robot on the computer or anything, just used a bit of cellotape

.
If i wanted to design a robot on the computer I personally would use Pro/Desktop or Pro/Engineer, since i allready have a good grasp of these programs.
But many on these forums seem to like google sketch up and solidworks. Ive never tried them so i dont know much about them.

Ziga · « **Reply #17 on:** January 03, 2008, 02:52:47 PM »

great

now i just need to know which parts i need so i can order them

and than it's time to build!

Anyway, which parts would be the best?

hazzer123 · « **Reply #18 on:** January 03, 2008, 03:18:47 PM »

The Best IR sensor would be a Sharp IR. But i used an IR LED and an IR phototransistor.
If you go with the LED/phototransistor approach, make sure that the wavelengths are matched for the two items.

The Hitec HS311 is ideal for a small robot - Link

You can get a PIC16F876A from Microchip Samples. You will need some oscillators, capacitors, resistors etc for the actual circuit, so research and order these, they'll only cost a small amount.

You can buy a programmer or make one. This is a classic home-made programmer - http://www.ic-prog.com/cpp.gif

For power, you can use an AA battery holder which are cheap and found in lots of places.

For the chassis of the robot, im sure you will be able to find something in the house to use as one.

.. I think thats about it.

Ziga · « **Reply #19 on:** January 04, 2008, 08:54:57 AM »

Thanx. I will buy it ^^

Only the probably last question - when you write the program for the robot in C, how do you load it on the robot?

cooldog · « **Reply #20 on:** January 04, 2008, 09:03:49 AM »

you need to find a compiler program my sujestion read the $50 robot to learn about the circut and how to program

Admin · « **Reply #21 on:** January 14, 2008, 09:21:58 AM »

Quote

Well, i was thinking more about somathing what would be designed by me and things like that.

Don't worry, the $50 robot offers a lot of flexibility. Its designed to teach you all the basics so that you can design your second robot all by yourself. If you don't want to make it, I still suggest reading it to get an idea of what parts you need and whats expected to program it.

Your first bot should always be about learning how to make a robot, then after that you can try out your ideas

News:

Author Topic: WAbot (Read 7273 times)