17 Servo Biped (formerly Robonova)

kleinjd

USA

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Finally got the hardware going, 16 Hitec HSR-8498NB servos with seperate aux power via two external servo boards (at the bottom of the pict). And the 17th for the camera of course. Draws 0.38 amps @ 6V with all servos holding !

Built out matching 1500 MAH NiMH packs (one per foot) also aux power from either battery back to run the EZB. Should run for a bit between charges.

Well on to building frames for actions.

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#2  

Thanks, this should be a lot of fun. Need to figure out a good support to keep him upright while I work on frames and adjust for his CG. He really needs to be supporting his weight to get the positioning right with so many DOF.

#3  

Nice, Please upload a video when he starts moving.

PRO
Synthiam
#4  

Very awesome! I'm really excited to see videos also!

The Auto Position control with movement is perfect. Take a look at the example robophilo project as a start:)

#5  

Well that was interesting, just set the speed down real slow, and started a nice smooth motion to stand on one leg. Fortunately I am running him off a bench power supply. Watched the current go to almost 2 amps, with all the weight on the left leg!

Looking at the servo spec, it says they will take up to 7.4v at 1.4 amps each at stall ! I am not sure I believe that spec. The original batteries were 6v, and he would run for about 15 mins on a 1000 mAH battery just walking. I am a bit nervous since Hitec does not make these servos any more, and they are hard to find if I toast one.

The knee took the weight but got more than a bit warm to the touch.

Am I just being paranoid?

PRO
Synthiam
#8  

I can't tell from the pic but is there a fan on the ez-b?