Step 1: Build your Bulldozer

So once you get your new bulldozer kit either in the mail or at your local hobby shop you have to put it together. These kits from Tamiya tend be a little on the expensive side but they are worth it. I found the worm gear box that I use to pan the laser in a box of old projects covered in dust, it hadnt been touched for maybe three years. After blowing off the dust and hooking it up it ran fine.

A pocket knife or leatherman should be all the tools you'll need to set up the bulldozer. The instructions are step by step and easy to follow even if the English is a little shaky. Since I wasn't planning on using Ard-e as a really weak bulldozer I didn't attach the plow.

The dc motors that drive the bulldozer are controlled by the double pole double throw (DPDT) switches that make up the controller. I added a diagram about how to hook up your own DPDT switch to control a motor because I later end up controlling the panning motor with another DPDT switch. Hopefully the diagram makes it clear that the switch when thrown one way makes the motor turn one way and when thrown the other it turns the other way.
That looks so hard and complicated idk how you could build that for a science fair project I am just saying well i guse some people are smart about building robots but I could not build that and what is it post to do? nothing or dose it move around? can it talk? can it pick things up? WHAT can it do?
does it even lift?? ;-P <br>awesome robot and instructable, i&acute;m trying to build a roomba bot while learning robotics (my knowledge go as far as H-bridge..), also i was thinking about buying an arduino board, now i&acute;m ordering one stat! <br>congrats..
Hey could a adruino uno work?
I tried to use your servo code, but I can't even get the Arduino IDE to compile it.<br><br><br>#include <br><br>int potPin = 2; // selects the input pin for the potentiometer<br>Servo servo1;<br>int val = 0; // variable to store the value coming from the potentiometer<br><br>void setup() {<br> servo1.attach(8); //selects the pin for the servo<br>}<br><br>void loop() {<br> val = analogRead(potPin); // read the value from the potentiometer<br> val = val / 5.68; //convert the value to degrees<br> servo1.write(val); //make the servo go to that degree<br> Servo::refresh(); //command needed to run the servo<br>}<br><br>=====================================================<br>The IDE seems to have a problem with the following line in your code:<br><br> Servo::refresh(); //command needed to run the servo<br><br>do you have a solution for this error?<br> I'm running the latest version of Arduino IDEs version 0023.
The latest version of the Arduino IDE is 0100<br><br>and try using Servo.refresh();
&quot;One of the motors spins faster than the other so he veers towards the camera near the end of it. I don't really know why this happens&quot;.<br>Would this be caused by the first motor (#1) in line with the + would cause a voltage drop to motor (# 2)?. Would placing a resistor in line with M#1 control the voltage better? <br>Another possible work around for this is to use the chip to control the ground circuit from the motor.<br><br><br>Just a thought, as most DC motors in automotive interiors use &quot;Hot&quot; motors and use the PCM directly or the PCM controls micro relays to control the ground to operate.<br><br>NooB.
Is that a toilet cleaning brush I see? (on the first picture) :) Nice 'ible!
In the code are those declarations in the begging pin numbers?<br>
Anybody know how this was interfaced as a voltage divide?
I love this instructable! 4/5* (becuase of the lack of code) Other than that Awesome! I really love how you made the robot with a lot of different functions..
where's the actual code for the light seeking behavior?
I forgot to post the code for it and it was written on my old laptop... I did it two different ways. The first way was with two light sensors mounted on the left and right sides and pointing forward. I then programmed it to spin the side that had a higher reading faster. The other way that I did it was to mount a single light sensor in the middle of A-rde on a servo and have the servo turn to the left right and middle and measure the light at these three points. Whichever was the brightest it would drive towards, stop and then make another measurement. I never really got good light seeking behavior...
Also, try making adjustable eyes. Use solid core wires soldered onto the two LDR pins and then twist the wires together. there bendy yet they hold their shape. i found that the best way to get them to work is pointing them upwards, bent slightly away from each other...
i tried the first method with the cds cells connected to analog pins 1 and 2. the analog pins had 10k ohm resitors going to ground and the other end of the cds cell went to +5v. I'll PM the code for what i used, I got excellent behavior, very accurate. BTW, i used a l298hn chip instead of the l239d, because i was able to sample it. You should change the code for the l239d, and I dont mind if you post it on the I'ble for others to use.
instead of the l293, i sampled the l298HN IC which is similar to the l293. but i got it for free...
&nbsp;why are there pins coming out of the bottom of the schematic sorry im pretty new to this.
the pins come out the bottom to make a simple design on the schematic. When actually building this, you should use the data sheet or any other reference to match the pin numbers on the schematic.
use the joy with an X-bee and make a Ard-e wireless and a camera so you can remotely control it from your computer and maybe a weapon system! <br />
Awesome instructable. Thanks for all the input. wanting to get a freeduino to start playing around with. Also thank your brother for the VOC, I know my cousin is going to freak when I finally get this worked out and the robot rolls up to his shoes and then waves it's little claw in front of it's sensor array/face does a 180 and speeds away.
I really like it, I was thinking of buying an arduino, but now that I have seen this project I'm deffinately going to buy one. I'm thinking of making a mobile platform out of knex (instead of the bulldozer) I have a question though, I assume the motors from the bulldozer use 3v each and you hook up a 6v power supply because the L293 needs it, so how do you run the motors?
Originally i had the L293 hooked up with only 3V supplied to it and then attached another batter pack because it wasn't working. The motors held up fine probably because i usually don't run them at a full duty cycle for very long.
love it here is a robot im making
I noticed that in your first video you are apparently controlling the robot by means of some switches that are physically wired from your controller to the robot. May I suggest using a wireless transmitter and receiver to make it remote controlled? I'm sure it will be worth the extra $10 - $15 and several new lines of code.
you should make a programmable paint ball gun like this then make an instructable awsome <a rel="nofollow" href="http://www.youtube.com/watch?v=-JvxnrzB1Jk&amp;feature=user">http://www.youtube.com/watch?v=-JvxnrzB1Jk&amp;feature=user</a><br/>
Instead of using L293 to drive the motors, you could have also used a TIP120 transistor instead of spending senven dollars, or 20 for a driver.
groovy little brother! glad to see all my stolen electronics components going to a good use:)
I have arduino and the tank kit. I should make this!
Make sure you post a link to it if you do!
ok, i just have to get a servo and some other stuff
Nice Job!! I was using the same bulldozer platform for the wall-e testing until I got a u-command wall-e now the electronics are in that so I can finnish the progrmming. Plus I like your instructible nice layout too. congrats. a++
Thanks. Wall-e is awesome, he was part of my inspiration for this project.
It's good to see that 4mem8 andI could inspire you and others that was our job to get the younger generation involved into thinking and modig what they see in robotics. Plus you have inspired people also, you got my vote!
<sub></sub><sub></sub><sub></sub><sub>that is nice</sub><sub></sub><sub></sub><sub>it would be better if you add more switches of not falling off the stairs hehe</sub><br/>
Very nicely written. I've been contemplating an Arduino and needed a project to start with, I think this is just the inspiration I need. I especially liked the info about the sensors and such. Thanks!
Kool project :) I like most arduino projects :D but this one is nice and detailed :)

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