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Cool stuff , what microcontroller are you using? Just starting to get into pic chips , post more pictures as you progress!
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this is the new robot im working on, the wheels were turned on my busy bee 10x18 and the plastic parts were "milled" on an 8" drill press with a compound vise.
http://i163.photobucket.com/albums/t...o/IMG_7966.jpg
Just a mock-up of the PCB and parts to make sure everything will work where it was designed to work.
http://i163.photobucket.com/albums/t...o/IMG_7965.jpg
Battery installed. its a 7.4V 730mAh li-poly pack.
http://i163.photobucket.com/albums/t...o/IMG_7963.jpg
Wheel detail. wheels roll on dual bearings. magnet for RPM sensor and sensor mounted. as a size reference, those are 4-40 screws.
Cool stuff , what microcontroller are you using? Just starting to get into pic chips , post more pictures as you progress!
im using a PIC18F6585.
Heres a couple pics of it with the board and components mounted..
the first pic is one of the motors on top of a scroll wheel on my mouse.
http://i163.photobucket.com/albums/t...o/IMG_7988.jpg
Ultrasonic sensor, PIC, SD card reader/writer, and 2-axis accelerometer
http://i163.photobucket.com/albums/t...o/IMG_7995.jpg
front view of ground clearance and ultrasonic sensor
http://i163.photobucket.com/albums/t...o/IMG_7999.jpg
Nice compact setup, I like it. What motor controller are you using?
im using a Pololu Micro serial motor controller. its supposed to do 2 motors at 1A each. works good, but im having some kind of interference problems that im working on...Originally Posted by dbc1218
I have that same controller and a low-voltage dual serial motor controller form pololu as well. Have not used them in a bot yet have a project in the works. I've had some problems with the low-voltage dual serial controller when I used it last. It would be working fine and then just stop the motor, not just turn off and let the motor coast to a stop, the motor would jerk and then it be done. Don't know what it is, tried it on a bunch of motors and it did the same thing. I think I'll be able to use it though.
thats exactly my problem, i copied the code out of the book to slowly speed up and then slow down, adn as it gets up to about 1/4 speed, everything just stops. i have an LCD display hooked to my PIC and it keeps counting, so the PIC is still running. when i move the motors out to about 2" away, everything works great, but as soon as i move it close again, it just shuts down.
When I did it I was only running one motor with the sample code. I had a bunch of the tamiya size motors, the ones that go in the planetary gearbox, one of them ran fine every time, but the others all did that same thing. I tried a bunch of different capacitors but nothing seemed to work. By the way what type of capacitor are you using on the motors? I might post some thing on pololu's forum, see if I can get some answers.
mine seems to work fine with one motor too... but when i add the second one in, it just freezes... im using 50V .1uF caps....
It sounds like the motors you are using are too big. Those r/c motors i think will pull a lot more than one amp when you give it the juice. might be something to check before you get too involved in troubleshooting.
Matt
the controller isnt overheating, and im pretty sure the motors arent too big... heres a pic of the motor,
http://i163.photobucket.com/albums/t305/dragons_fire_photo/IMG_7988.jpg and they are rated,
50mA @ 6V, Producing 30.7 oz-in of torque with a stall current of 533ma.
they do draw a little more than 50mA each, but its not too bad... the controller is rated up too 1A for each motor. so maybe it doesnt sense a load on it and its shutting down.. i dont know if it does that, but it could be a possibility...
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