Raspberry Pi Forums

Posted: **Tue Nov 13, 2012 7:32 pm**

Hi, I have question about Python. I´m building my first robot and I tried to write program in Bash and it looks like this

Code: Select all

#!/bin/bash
gpio mode 1 out
gpio mode 2 out
gpio write 1 0
gpio write 2 0
while true
do

read -n 1 -s x

case $x in

  [w]*)
  gpio write 1 1
  gpio write 2 1
echo "forward"
;;
 [s]*)
   gpio write 1 0
   gpio write 2 0

    echo "stop"
;;
[a]*)
    gpio write 1 0
    gpio write 2 1
     echo "right"
;;
[d]*)
  gpio write 1 1
  gpio write 2 0
  echo "left"
;;
esac

echo "You have pressed $key"
done

and it is working quite good. But i wanted to try software pwm so i tried to write python program like this

Code: Select all

import RPi.GPIO as GPIO
import time
import signal
import Tkinter as tk

from pizypwm import *

first_f   = PiZyPwm(0.01, 100, 12, GPIO.BOARD)
second_f   = PiZyPwm(0.01, 100, 13, GPIO.BOARD)

first_f.start(50)
second_f.start(50)
time.sleep(1)
first_f.stop()
second_f.stop()

I tried to call this python script from the bash script when i press w. and it is working. But i wanted to press w and drive forward until i press s and and the same with every key.

Could anyone help me please?

Thank you for any answer and sorry for my bad english.

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