Problem with pause command

[Wasserflo]

Hi,
I have build a small 'robot', based on two motors and a L293 Motor IC and two bumper switches at the front, left and right.
It's a really simple program.
When starting it will go forward until one bumper PIN get's down.
Then it should go backward for 2 seconds, make a little turn and go forward again.
This works for a couple of seconds. After that it seems that the 2000 delay is only a 2 delay.
I see that the motor stops, but it goes immediatly forward again.
Any ideas what happens here?
I use a 14M2 for this.

main:
    pullup on
    pwmout pwmdiv64, B.2, 124, 0
    pwmout pwmdiv64, B.4, 124, 0
    pwmout pwmdiv64, C.0, 124, 0
    pwmout pwmdiv64, C.2, 124, 0
    gosub vor
    do
        if pinB.1 = 0 then
            gosub rueck
            gosub drehL
            gosub vor
        endif
        if pinB.3 = 0 then
            gosub rueck
            gosub drehR
            gosub vor
        endif
    loop

vor:
    pwmout pwmdiv64, B.2, 124, 0
    pwmout pwmdiv64, C.0, 124, 0
    pwmout pwmdiv64, B.4, 124, 249
    pwmout pwmdiv64, C.2, 124, 249
    return
    
rueck:
    pwmout pwmdiv64, C.2, 124, 0
    pwmout pwmdiv64, B.4, 124, 0
    pwmout pwmdiv64, B.2, 124, 249
    pwmout pwmdiv64, C.0, 124, 249
    pause 2000
    return
    
drehL:
    pwmout pwmdiv64, B.2, 124, 0
    pwmout pwmdiv64, B.4, 124, 0
    pwmout pwmdiv64, C.0, 124, 0
    pwmout pwmdiv64, C.2, 124, 249
    pause 500
    return

drehR:
    pwmout pwmdiv64, B.2, 124, 0
    pwmout pwmdiv64, C.0, 124, 0
    pwmout pwmdiv64, C.2, 124, 0
    pwmout pwmdiv64, B.4, 124, 249
    pause 500
    return

 

[The bear]

Your pause 2000 is 2 secs, were you thinking 20000 = 20 secs.

Good luck..

 

[Technical]

If it keeps going forwards you've probably got electrical noise resetting the microcontroller. If a motor stalls this could potentially cause this. Add a command at the start of your program (e.g. flash an LED) to see if it is resetting.

 

[inglewoodpete]

Further to what Technical has said, above, the wiring interconnect for a microcontroller operating a motor is critical.

While the motor and microcontroller can run off the same power source, they should not share the power wires. In the case of battery operation, separate + & - wires should be run for the microcontroller and the L293's motor power/ground pins.