Need help with RC car forward and reverse issue

azpoulton

Hello,

I am new to parallax boards and I am working on a Board of Education USB rev B. I have connected it to a Dynamite Tazer 15T RC car controller in the 12 and 13 locations (X5). I have been using pulsout commands to figure out how to get the car to go forward, reverse,left ,right. My question is, when i try to go forward and then reverse in the same code, the reverse will not work. For example, i try to go forward and then pause for 5000 and then go reverse and the reverse will not work, but if i go reverse and then forward it works. If i try reverse and then forward and then reverse again, it will not work. I usually have to turn the board and the car off and then on again to get the car to go reverse again. I have LEDs plugged in for debug reasons, and they light up like they should. Here is the code:

' {$STAMP BS2p}
' {$PBASIC 2.5}

counter        VAR     Word

DEBUG "backwards", CR
FOR counter = 1 TO 15
PULSOUT 12, 4100
PAUSE 20
NEXT

PAUSE 5000

DEBUG "Forward", CR
FOR counter = 1 TO 15
 PULSOUT 12, 1300
  PAUSE 20
NEXT

PAUSE 5000

DEBUG "backwards", CR
FOR counter = 1 TO 15
PULSOUT 12, 4100
PAUSE 20
NEXT

The second "backwards" code runs, but the car wheels don't move. Is the issue my code? Or the car?

azpoulton

UPDATE: I was troubleshooting and learned that I have to turn off the car and the board. If I just turn off one or the other, reverse will not work.

azpoulton

SOLVED: I was not looping enough times for the servo to go in reverse. This updated example code shows the forward pulsout needs much less then the reverse pulsout.

DO

DEBUG "backwards", CR
FOR counter = 1 TO 50
PULSOUT 12, 2500
PAUSE 10
NEXT

PAUSE 3000

DEBUG "forwards", CR
FOR counter = 1 TO 2
PULSOUT 12, 1250
PAUSE 20
NEXT

PAUSE 3000

LOOP

END

rekk1986

I am also a newbie to this forum, so I join with the aim of learning something from all of you here.