
Troy
USA
Asked
— Edited
...from the newbie...
Can each digital port send I2C? Because I saw some I2C servo controllers that handle multiple servos. Could this expand the number of servos (or H-bridges) controlled?
That is why the EZ-B has only one I2C interface
hmmmm maybe I will think of something....Ive got a good feeling on this. It just wont be a level 1 project i think but I just KNOW this could be awesome if I can control it wireless with LAPTOP brains and new sensors.
But alas...mobility first....
What kind of servos are you thinking of using?
IDK about the servos. Id love to see the insides and replace those noisy gears and motors. Even if it was only a little quieter. Looking at pix on the internet I may have to keep the gear set up and put quieter motors in. Soooo...there will still be the problem of too many digital signals gobbled up for that many H-Bridges. Im still wondering if there is a ready interface solution to using a servo control pulse to create the needed HL LH LL for the H-bridge.
Like ... pulses high...rotate clockwise (HL)...pulses low...rotate counter clockwise (LH)....no pulses...stop(LL)..
That way only one servo port needed to control one H-Bridge. Thoughts?
There are 20 i/o on the ez-b...
Each motor would take 2 i/o of the ez-b (for your hh, hl, lh, ll)
You "could" look into which hbridges are ALWAYS going to be on at the same time and double up the connections, but i don't know how much that is worth to you? It'd be a lot of work to save only a few i/o
If you used 20 i/o, you deserve some sort of magical prize because that's the most anyone has used on an ez-b. i've never come close
Prize for 20 IO? Not if its ALL H bridges because that means i really moved 10 motors and no DI/O for other stuff!
-Troy
Glikityclik
and guess what....sigh....after a few hours more digging through the internet there is a picture of EXACTLY what Im talking about.
Glikityclik
I'm constantly impressed of the engineering that you guys are all doing. I know I "hack" things together pretty quickly. But nothing I do is very complicated (except maybe making the ez-b haha). My mechanics are hot glue gun and screws and a dremel.
Hats off to your confidence!
I was just wondering if DJ, Troy or anyone else has tackled this project?
Do you think that the V4 would offer better possibilities?
I am seriously thinking about tackling this project. I would replace all of these leg and neck motors with servos. It could get pretty costly. Programming this guy could be "fun".
I did give up on that one because even if I took apart some servos for the boards and used the potentiometers in the joints that are already there I would still run into space issues. There doesnt seem to be enough room for the EZB and extra boards. If you think about the cost of servos and an ez-b you might as well purchase an older Aibo.
If cost is no object, why not build your own 4 legged bot so you are guaranteed to have room for all the gear you want.
Darpa little dog
idk, I will probably buy one for the body and start chopping it up to see if its even possible.
Thanks for replying. I may be taking on more than I can chew, but heck...thats how I learn best.
I have an unopened one on the way. I figure I can give it a go and document the progress as it is made or failed. It is better than documenting the progress of yet another wall-e, which I am working on now.