Let's Make Robots!

Pabumon 1.0

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PROJECT CONTINUED!

So I found a motor from a toy. Works fine. The same speed as the other. But I still have the problem with the whole robot turning. I'll post a video soon.

Also, I renamed him. I'm a fan of Digimon and I want to name all my tobots after some of the monster from the series. :-D

 

This is the most complete robot that I could make due to having a very hard time finding any components for construction. Living in a second world country (Serbia in my case) has unbelievable limits in going through just a simple robotics project as this. I could only find a ultrasonic sensor and that's it. If one of the DC motors breaks I can kiss this project goodbye. Even though I have been building it all for just a few days I've actually spent months tracking down most of the parts. The whole project so far cost me more than half of my monthly salary, but I still think it was money well spent. 

By chance the robot looks like the James robot by chickenparmi, but I guess it's because it's a very simple robot of a basic design. I didn't even know about James robot until I've already built Talos1 and found this site looking for some tips on how to program it better. But afterwards I made the same frame for the "head", since James' one was kinda neat. :-D

Parts:

1. Arduino Uno Rev3

2. Adafruit Motor Shield

3. Chassis by MCStudio China, includes 2 DC motors, a switch and a case for 4x1.5V batteries

4. Case for 6x1.2V batteries (the 4xAA from the kit didn't provide enough power)

5. HC-SR04 UltraSonic sensor

6. Mini-Servo motor

7. Additional platform made from wood and a frame for the sensor

 

You'll notice it has two platforms. That's because the original one that came in the chassis kit didn't have the holes that matched those on the Arduino. So I made my own, plus I made a space to put the servo in. 

 

Talos1 Schematic

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Good project! You can try to disassemble the motor... and you need to solder wire with brush wire... Here the photo of motor internals http://www.sciencephoto.com/media/141212/view maybe it will help you!

Or try to find your gearbox here http://www.aliexpress.com/item/Freeshipping-2set-lot-Smart-Car-Robot-Plastic-DC-3-6V-48-1-Drive-Gear-Motor-with/1037419698.html

 

Can you post a photo of the gearbox type you are using?

Recently I got some samples for a new motor/gearbox combination that look the same as what your using but I can't be certain because you only posted 1 photo.

The new motor / gearbox might not only solve your problem of the broken wire but also the problem of making your robot travel in a straight line. The motor shaft and output shaft are both extended out the back and will take our simple encoder kit.

If you put then encoder kit on the output shaft then you get 8 pulses per revolution of your wheel. If you put the encoder disc on the motor shaft then you can multiply those 8 pulses by the gearbox ratio to give you much higher resolution / precision.

This is the kind of gearbox I'm using (if that's what you meant):

http://www.jameco.com/1/1/47334-dg01d-gear-motor-90-degree-shaft.html

And I already found some IR recievers and lights from an old ball mouse, I'll try to use those to measure each wheel's speed.

Ok, no this is the motor I was talking about.

I don't work in the sales department so I'm not sure how hard / expensive it is to ship to Serbia but as it is hard to get parts there you might want to try ordering directly from DAGU. Contact Pome.

Don't you have some old toy, Rc cars, baby toy or something that contains af motor and batteries, the motor you're looking for is fairly common in toys, I often go to garagesales and look for old toys I can use, take it apart and take what I can use. Wheels, gearmotors and all kind of switches and sensors are often hidden inside the toy. Keep up the good work;-)

Yeah, I found two. Don't work. I'll find something. And no such thing as garage sales in my country.

Garage sales seem to be an American thing, I have never seen one here in the UK either. Keep looking though. Good luck
It is a normal thing here in Denmark where I live, also big marketplaces where people selling things they don't need no more, sometimes you can find some good things for small money :-)

If you try and pool some solder on where the pin came off you may still be able to get a connection.

Otherwise, sorry to hear it :(

tried it. not enough of the pin is left. but at least I know what kind of motor I need. I'll get one in a few months. or maybe like 10 just in case. :-D