Let's Make Robots!

Servo'd Bluetooth'd Tamiya Bulldozer Robot


Hey cats. I spent the past 2 days writing a new design/control app for the ez-b and decided to make a new robot as a test platform. so yesterday i noticed i had a few of these bulldozer kits lying around, but i find them annoying due to the DC motor gearbox. A few years ago i started using modified servos instead of dc motors on the bulldozer kit. I get the odd email asking how i did that...

Soooooooooooo, i coupled the two together. A video showing how to build a servo driven tamiya bulldozer and the ez-builder

Robot: http://www.ez-robot.com/Projects/Robots/Tamiya-Bulldozer-Robot

Video: http://www.youtube.com/watch?v=-rqdtgcnG3A&feature=player_embedded

EZ-Builder Software: http://www.ez-robot.com/EZ-Builder/

What do ya think?

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Yes 3 phase. The PWM I generate goes to the ESCs that control those motors. It's pretty silly when you think about it. The ESCs are controllers - they have some chip that does logic. But they are programmed to deal with signals from a receiver that is getting analog over RF so they decode that to drive the motors. I have to generate that analog signal even though I have the raw information about how fast I want to drive the motor and in what direction. But I have to do this dance of implication and inference over an analog line instead of just sending digital information. There are digital controllers, but the hardware guys don't want to use them. They like being able to plug in a RC controller and demonstrate that they have the unit working properly.

Interesting stuff.   I'll check out the EZ-Builder.