Super

Please document your project  

Nice job leandro  

what type of motors are you using ??

Hi,

I have build a balancing robot based on Sparkfun 5DOF acc/gyro combo, Arduino and Parallax continuous servo.
I had sofar mixed results and suspect the servos have to much backslash

I want to test the AX12 route.
Can you point me to some Arduino code to run these specific servos  :

TIA
Yves

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The "looseness" you describe is a real problem with balancers.  I used motors similar to yours at first, but was able to achieve much tighter and more responsive balancing by switching to zero-backlash servos (Dynamixel AX-12).

Here's a little sample movie of what a difference reduced backlash makes: ....

That demo is using the "encoder" (continuous rotation pot) integrated into the AX-12.

A friend of mine worked on a commercial balancing toy.  He mentioned that it used cheap high-backlash motors, and they had to use sophisticated filtering and modeling to accommodate the backlash.  It took an experienced control expert quite a while to get it working.

So I'll just stick with tighter motors.  

- Nathan

Finally the wired product, based on an Adafuit shield
This version includes a buzzer and a jumper for 1 to 5V and  5 to 14V batteries



Read the full story here: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1258728470

Enjoy

Hi,

Use LM34's
They have better resolution and can go negative °C
You need to convert from °F to °C within your code

Nice job

myozone:
Yes the AX12 has built in continuous rotation feature w/o hardware hack

I have found theoritical discussion on Arduino/AX12 interface here:
 http://robosavvy.com/forum/viewtopic.php?t=1760&highlight=ax12+arduino
but sofar no actual working code

As anybody developped some demo code to control AX12 from Arduino ???  

TIA
yves

Hi,

I have build a balancing robot based on Sparkfun 5DOF acc/gyro combo, Arduino and Parallax continuous servo.
I had sofar mixed results and suspect the servos have to much backslash

I want to test the AX12 servos which are supposed to have reduced backslash
Can someone point me to some Arduino code to run these very specific servos (serial communication)
http://www.bioloid.info/tiki/tiki-index.php?page=AX-12+page

TIA
Yves