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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.
By kleinjd — Last update
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The Auto Position control with movement is perfect. Take a look at the example robophilo project as a start
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?
Thought about making another plastic plate to go across the top and using that to mount the fan.
Also noticed one of the transistors is a bit loose on the center pin that holds it to the board. Not the tabs the round center pin. It allows it to wiggle (like a loose tooth).
Turns out there is a new servo from Hitec that replaces this one. It is a bit beefier. Just ordered a a pair to replace both knee joints.
Sorry it took so long to get back to this. I got bogged down with work, and my free time suffered quite a bit. Thank you for the help !
A while ago I ordered him some new knees http://www.servocity.com/html/hsr-5498sg_servo.html
They are 187 once/in. Not quite upto your Power HD. I need to go check those out for sure.
These were the replacements for the stock ones I was using and fit in without any mods.
Not sure why the change, other than age. This was a stock config, and worked fine with the old controller. I suspect the old controller had some form of current limiter circuit to prevent this from happening.
The new ones seem to be working fine so far, keep my finger crossed :-)
Also picked up a MMA7455 to play around with I2C, but have not been able to get a stable connection. Cables are all short lengths less than 2 inches no real joy so far.
Have a couple heli accelerometers on order to improve his balance. I pulled one out of a heli to test it and it seems to work well. Nice to have the realtime feedback into the hip joints.
Almost forgot I am in Maryland.