robot cat in progress
Roboticsmaster128
Posts: 32
my freind ttailspin on here convinced me that nothings to hard and im am now back on with the robot cat idea!i will be reporting my progress as i build and program the robot cat.
Comments
http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/pir/List/0/SortField/4/ProductID/83/Default.aspx
You probably won't find anything that can recognize human faces for less than (insert your concept for too much money here).
The additon of to your post isn't likely to help in getting more replies. Some of us cranky old men might consider it rude (not this time but maybe the next
Of course, real cats are plentiful and free. Just feed a stray and he's yours...
Sounds like a pretty ambitious project. Have you scratch-built a few other robots already? What kinds?
How many servos can a BS2 handle before refresh becomes a problem? I'd assume it has a lot to do with what else is going on but do you have a rough estimate?
Is Rm128 going to need some sort of external servo controller? (And I think I agree with your likely choice of ucontroller for this project.)
Will your cat purr?
Screetch, hiss and meow would be fun too. Short sound files too!
The most I've personally tried is 3 servos with a vanilla BS2E, which worked fine on a robot arm where not much else was going on:
Four or five might be possible, probably if a faster stamp is used. But things like Sony SIRC IR remote control are out unless you offload to a Servopal, because just reading the IR code can take longer than the 20 ms pause between servo control pulses. Actually less than 20 ms with more than one servo.
I just got a few of these $2 Turnigy servo reversers: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=17033
My intent is to reduce processor overhead driving two servos when driving straight. Typically you have to send different opposing pulsouts (like 650, 850) to left & right CR drive servos to drive straight. With a servo reverser on one, you could send 650 to both, or even use one output pin to drive both. Of course then turning becomes a problem. It's never easy...
FYI, those cheapie servo reversers work great, but they are not perfectly centered & symmetrical around 1500 ms, so each servo centerpoint must be recalibrated.
In a related story, these $5 speed controls are only now back in stock at Hobby King, I ordered two:
http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=9090
This is an airplane throttle, not an H-bridge, so no reverse. But for $10 a pair, it's worth some experimentation. You could always throw in a DPDT reversing relay!
Please don't delete posts like this.
It makes all the work others have done trying to help you less meaningful to future readings.
This is bad manners!
I see your PIR sensor and raise you one:
Can you locate people with that setup? Very cool.