Experience Level: Intermediate (requires soldering)
Time Required: 3-5 hours depending on experience

J-BOT Kit Jameco

Someone mentioned that Jameco needed a robotic mascot. I have always been a tinkerer, especially with radio-controlled electronics and so I volunteered for the chance to design and create the J-Bot. While this was my first autonomous robot build, I'm confident it won't be my last. We thought this would be a fun project to build.

Required tools and parts:

Jameco J-BOT Kit
Arduino UNO
11 AA batteries (5 for the motors and 6 for the Arduino, servo and sensor)
Philips screwdriver
Long nose Pliers
Soldering iron
Solder wire
Helping hands

Step 1: Building the 4 wheel drive platform

Before building the brains, we'll need the basic platform. I found some good videos to help step me through the process of putting together the same 4 wheel drive platform that is included in the J-Bot kit.





After soldering the wires to the motors, I suggest adding a drop of hot glue to the copper clips so the clips do not rip off because they are very fragile.


At this point it would be a good idea to label all the cables so you can identify them later. I decided to label them by using regular scotch tape. I labeled the two front motors "FL" and "FR" for front-left and front-right, as well as the back as "BR" and "BL" for back-right and back-left.
<p>Hello, I'm having trouble with calibrating the motors... the robot constantly deviates to the left when moving forward, even after increasing the speed of the left motor. Also, I did ensure that the wheels are aligned properly, parallel to each other and flat on the floor. The deviation is more of a curvature rather than a slant. do you have any suggestions as to how to tackle the issue? thank you very much</p>
<p>please note though, that I did slightly modify the code for the 2 wheel model by reducing the speed to 90/94 for the right and left motor respectively, and calibrating the time delay on the turns to 90 degrees. the 90/94 speed was the optimal speed to have it go as straight as possible but there is still quite a significant deviation to the left. It would deviate about a foot to the left over the distance of approximately 2 feet forward</p>
Could you email me a code that would work with a four pin ping sensor and also would an arduino motor sheild work just the same as Ada fruit one?
Not sure about the motor shield. The Adafruit motor shield requires a library, so the code may be entirely different from what would be needed for the Arduino motor shield. The same goes for the ping sensor. I used the library and sample code that came with a 4-pin ping I was evaluating on a breadboard, but it would not work using the instructions. Instructions said only the 'echo' pin was needed, but the serial monitor would only show zeros. I connected a wire from the 'trig' pin to the 'echo' pin so they were both on the same I/O to the Arduino, and it worked. <br> <br>Not saying that will be the fix for you because I'm using sample code for a 3-pin ping and that same trick I tried is not working with my 4-pin sample.
Very nice job! It's very neat and tidy. Congratulations!
Is there an update to this that addresses the new version of this kit that uses the DFRobot's Romeo board?
<em>Do&nbsp; you connect the battery pack to both the arduino and motorshield, or just the motorshield and use the standard 9v pack for arduino.<br> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Thank you</em>
im pretty sure you use the 9v for the Arduino, and the pack for the motor shield
i just uploaded your code and tried several times more i had no problems with uploading but when i upload it i turn the batteries on and the robot just sits there and does nothing
Hello Sean, there are two battery packs in the kit. One to power the Arduino and the other is to power the motors. Make sure that both of them have power. <br> <br>-Omar
Hi just wonder how you worked out your &quot; look around &quot; times <br> <br>Thanks
HI guys, I was wondering if you can help me out. I need to know how to preprogram (a code) a path into an arduino so it can move the way I want it to and use two motors(each attached to one track) to help it to go the preprogrammed route. Help would be much appreciated.
Hello singh1234, There are several ways you can approach this. You can add encoders to the motors and program it that way. You can also program it by making it go forward for a couple seconds and then turn for a couple of seconds. Depending on the size of you robot, I believe using servos would be the best and easiest option, for example, using this <a href="http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_283039_-1" rel="nofollow">servo</a>.<br> <br> Good luck!!
Thank you. You guys are the best. One question though, to use three of these servos, do I need a motor shield? (Jameco Part no. 2152403) If I do, do you guys ship to Australia? thank you again.
I just finished putting my 'Arty' ping-bot together, using your code, but stripped-out the Adafruit motor controller part, Using the Adafruit Proto-shield, and went with 2 modified Futaba S3004 servos converted to constant rotation. (an old trick I learned long before seeing the projects here.).. It took reverse engineering your code a bit, though.. swapping the motor values for Fwd/Rev, stripping out the Centimeters return, since the distance is only dealing in inches, and cutting the delay times in 1/2 for the turn and back-up times, since the servos seem to react faster. It's not as elegant as the J-Bot's frame, but everything packed into a 7&quot; X 5&quot; X 3&quot; 4-locking side food container., and powering it off a 7.2V RC car battery. (using a 7805 to drive the 3 servos, and the PING)) ) All I need do, is plug the power adapter (standard RC-Car to coaxial) from the battery into the board, close the lid, then let it roam around.
And, 'Arty' in action! http://youtu.be/E7iytmVTBqs<br>
copied and saved your code, it might iron-out problems I've been having with a similar design, using the arduino, creating a 'BOE-Bot' style, using only 3 servos (two for mobility, and one for the PING)) )<br>
good work
This is just what mine should look like if I'd ever got round to finishing it.<br><br>Hopefully this great 'ible will spur me on to finish it.<br><br>Nice job. Hopefully mine will be half as tidy as yours.
Very nice! Neat and tidy, just the way it should be. Congrats on the design.

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