Trying to work with a Polu Serial motor controller

charleyshf

Hello,

I am fairly new to the Propeller and have been trying to get my prop to talk with a Polu Serial motor controller, I found an example for the basic stamp 2:
serout pin,baud,[noparse][[/noparse]$80,0,0,speed]

I have tried using simple_serial.spin as well as FullDuplexSerial.spin without any success.
With simple_serial·I tried :
dira[noparse][[/noparse]4] := 1· 'Set pin4 to output
outa[noparse][[/noparse]4] := 1 'Set pin4 to high(enables motor controller)
a·delay
SERIAL.init(-1,3,9600)
a delay
SERIAL.str(string($80,0,0,127))

The module I am trying to work with is this: http://www.pololu.com/file/download/smc02b_guide.pdf?file_id=0J36

I can get this working with my BS2, but for some reason I cannot get it to do anything with my prop.

I'd appreciate any ideas.

Timmoore

This is hte code I use with that controller.

charleyshf

Thank you for the code, I was going through them and I was wondering about·how to use MotorSpeed(???) in motormdsmc.spin it's not clear to me, I can use MotorSpeed(127) which makes both motors go forward(and there's quite a delay before it does go, thinking it's maybe the motor controller), but I am trying to figure out how to make it turn left,right,etc, etc,.

Thank you again for your help.
··

Timmoore

You will not able to use the attached directly (in particular onebot.spin and tribot.spin) - I use a non-standard build system but botxwd.spin translates from an arcade style RC controller input i.e. forward/back, left/right to motor speed for a 2 or 4 wheels bot. onebot calls it and tribot.spin is an example config. If you dont use encoders on the wheels then nullencoder just copies from botxwd to motorspeed.

charleyshf

Thank You

charleyshf

Thanks again for the examples, but honestly I think I have quite a ways to go with learning how to use the prop & spin, So far I have been able to interface an XBee module, sonar units, some I2C devices, servos(both regular and continious rotation ones) to the prop with help from the obex.

I know nothing about assembly.

Something I was thinking about, when using this motor controller with the basic stamp, or even a pic, it's just slow in general, so even if I could get a robot that avoids objects using sonar, with this motor controller I would need to set the distance way up there, or maybe I just have a bad motor controller unit.

Anyways I think it's going to be easier for me to either get a different motor controller that is controlled with either PWM or even like the HB-25's, at least with modified servos for wheels I am not having issues like this, I spent the entire weekend trying to figure out what the hec I am doing wrong, and I am still at a loss.



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