Need Help with BS2 connected to a motor controller

Balden

Hi. I have a bs2 in a board of education. I want to program my RC car's Brush motor to run. I have a motor controller by NOVAK. It is the XRS sport reversible motor controller. I am not sure how to program the motor speed controller with the basic stamp 2. I can control the steering servo motor no problem however. Can someone help me? I added pics so you can get an idea. Thanks

Balden

Here is some practice code I tried. The motor turns on then slowly slows down. Then it barely moves and just makes noise. Can someone tell me what is going on? Any feedback or questions would help.



' {$STAMP BS2}
' {$PBASIC 2.5}

speed VAR Byte
HIGH 14
LOW 15
HIGH 15
PAUSE 100

FOR speed = 0 TO 127
SEROUT 14,84,[noparse][[/noparse]$80,0,0,speed]
PAUSE 20
NEXT
FOR speed = 127 TO 0
SEROUT 14,84,[noparse][[/noparse]$80,0,0,speed]
PAUSE 20
NEXT
FOR speed = 0 TO 127
SEROUT 14,84,[noparse][[/noparse]$80,0,1,speed]
PAUSE 20
NEXT
FOR speed = 127 TO 0
SEROUT 14,84,[noparse][[/noparse]$80,0,1,speed]
PAUSE 20
NEXT

Balden

I think I have narrowed it down. Here is the million dollar question. A receiver inputs some impulses or logic to the motor controller which makes the motor accelerate, or decelerate or go reverse or forward correct? So, how do I mimic what a receiver inputs exactly for this device? I have researched and experimented and analyzed this problem and I still not getting my machine to operate very good. Hope to hear some good advice when I wake up. Thanks and good night.

Bruce Bates

Balden -

Good analysis of the problem. You can mimic those pulses with the PULSIN and PULSOUT commands.

Regards,

Bruce Bates

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Involvement and committment can be best understood by looking at a plate of ham and eggs. The chicken was involved, but the pig was committed. ANON

Post Edited (Bruce Bates) : 8/6/2008 10:06:52 AM GMT

Balden

Figuring out now the exact PWM that a reciever sends to the motor controller. For example, full throttle foward, and full throttle reverse. What would be the Pulse width, and Pulse duration?

Franklin

Well, it looks like it hooks up to the receiver like a servo so I would start with sending it pulses between 1ms and 2 ms with a pause between pulses of 20ms. This is what works for servos and you will have to test and adjust these valuse for your hardware but that should give you a place to start.

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- Stephen