SunFounder PiCrawler Kit - Advanced Python Projects

SunFounder PiCrawler Kit
3.4 Keyboard Control
In this project, we will learn how to use the keyboard to remotely control the PiCrawler. You can control the PiCrawler
to move forward, backward, left, and right.
Run the Code
cd /home/pi/picrawler/examples
sudo python3 keyboard_control.py
Press keys on keyboard to control PiCrawler! * w: Forward * a: Turn left * s: Backward * d: Turn right * esc: Quit
Code
from picrawler import Picrawler
from time import sleep
import readchar
crawler = Picrawler([10,11,12,4,5,6,1,2,3,7,8,9])
speed = 90
manual = '''
Press keys on keyboard to control PiCrawler!
w: Forward
a: Turn left
s: Backward
d: Turn right
esc: Quit
'''
def show_info():
print("\033[H\033[J",end='') # clear terminal windows
print(manual)
def main():
show_info()
while True:
key = readchar.readkey()
key = key.lower()
if key in('wsad'):
if 'w' == key:
crawler.do_action('forward',1,speed)
elif 's' == key:
crawler.do_action('backward',1,speed)
elif 'a' == key:
crawler.do_action('turn left',1,speed)
elif 'd' == key:
crawler.do_action('turn right',1,speed)
sleep(0.05)
show_info()
elif key == readchar.key.CTRL_C or key in readchar.key.ESCAPE_SEQUENCES:
print("\n Quit")
break
sleep(0.02)
(continues on next page)
3.4. Keyboard Control 49