Let's Make Robots!

Doodle Bot

Draws nonsensical pictures
AttachmentSize
Doodle_Bot.zip959 bytes
microM_V1.3.zip8.17 KB

Having one of those days where your too lazy to do anything? Have a robot doodle for you while you sit back in your favorite chair. This is a very simple drawing robot that was actually started by one of our student engineers. I just made the base plate bigger so I could add a third servo to raise and lower the pen.

My base plate is laser cut acrylic but it could easily have been a small food container, CD or a piece of wood. Just use some double sided tape or hotglue to hold it all together.

Because the Micro Magician has the dual "H" bridge, IR receiver and servo outputs already built in this is a very simple robot to build. Just plug in the batteries, geared motors and servo.

I set the servo voltage selection jumper to 3.3V. Some servos will not operate at 3.3V but the little black duck servos seem to work fine, just a little underpowered. I could run the servo directly from the battery but it is 8.4V when fully charged which is dangerously high for a 6V servo.

Programming was easy as well. The Micro Magician library has drivers for the H bridge as well as the IR receiver. I have attached the code and latest version of the Micro Magician library which can also be downloaded from my product support site: https://sites.google.com/site/daguproducts/

This robot is a great way to entertain the kids on a rainy day. Simple to build and easy to use.

 

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I was very exited to build this robot, so once I recieved the kit I build it right away.

Strangly the motors for the wheels did not spin. The documentation supplied mentions that the motors can be a bit stuck and after some use they will loosen up. So it tried and tried and was able to get one to work. The other no luck. It can hear it work but the wheel is not spinning.

So I emailed Claudia (contact person to order the kit from) but have not received a reply.... Can anyone tell me what motors the kit have so I can try to find them somewhere else to buy. I dont want to trash the kit just because of this.

Any help (hopefully from Cluadia) is apreciated.

-Fred

Claudia said she did reply but now she is training a replacement so you might get an email from Pome instead. She says the motors are being posted today.

Thank OddBot. I recieved her email this morning. She is sending me a replacement motor. That is great customer service.

Again thanks.

-Fred

Congratulations, this is really a great project! Small and very precise moves.

Damn, double posted again :(

We talked to the servo factory that makes the black duck servos.

In the future (about 4 weeks from this post) we will have them available as a simple geared motor as I used in DoodleBot. They are a nice combination of small size, good torque and low cost. The standard servo housing makes them easy to mount and they can be run from any controller with a dual "H" bridge such as an L293D.

But is this robot having any sensor .

The only sensor being used is the IR receiver.

haha, i love such days. They will flood your brain with a thousand ideas ;-)

The IR interface provides up to 128 different inputs so it would be easy to assign pre-programmed shapes to different buttons on the remote control.