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2. Keyboard Control
In this project, we will learn how to use the keyboard to remotely control the PiCar-X. You can control the PiCar-X to move forward, backward, left, and right.
Run the Code
cd ~/picar-x/example
sudo python3 2.keyboard_control.py
Press keys on keyboard to control PiCar-X!
w: Forward
a: Turn left
s: Backward
d: Turn right
i: Head up
k: Head down
j: Turn head left
l: Turn head right
ctrl + c: Press twice to exit the program
Code
from picarx import Picarx
from time import sleep
import readchar
manual = '''
Press keys on keyboard to control PiCar-X!
w: Forward
a: Turn left
s: Backward
d: Turn right
i: Head up
k: Head down
j: Turn head left
l: Turn head right
ctrl+c: Quit
'''
def show_info():
print("\033[H\033[J",end='') # clear terminal windows
print(manual)
if __name__ == "__main__":
try:
pan_angle = 0
tilt_angle = 0
px = Picarx()
show_info()
while True:
key = readchar.readkey()
key = key.lower()
if key in('wsadikjl'):
if 'w' == key:
px.set_dir_servo_angle(0)
px.forward(80)
elif 's' == key:
px.set_dir_servo_angle(0)
px.backward(80)
elif 'a' == key:
px.set_dir_servo_angle(-35)
px.forward(80)
elif 'd' == key:
px.set_dir_servo_angle(35)
px.forward(80)
elif 'i' == key:
tilt_angle+=5
if tilt_angle>35:
tilt_angle=35
elif 'k' == key:
tilt_angle-=5
if tilt_angle<-35:
tilt_angle=-35
elif 'l' == key:
pan_angle+=5
if pan_angle>35:
pan_angle=35
elif 'j' == key:
pan_angle-=5
if pan_angle<-35:
pan_angle=-35
px.set_cam_tilt_angle(tilt_angle)
px.set_cam_pan_angle(pan_angle)
show_info()
sleep(0.5)
px.forward(0)
elif key == readchar.key.CTRL_C:
print("\n Quit")
break
finally:
px.set_cam_tilt_angle(0)
px.set_cam_pan_angle(0)
px.set_dir_servo_angle(0)
px.stop()
sleep(.2)
How it works?
PiCar-X should take appropriate action based on the keyboard characters read.
The lower()
function converts upper case characters into lower case characters,
so that the letter remains valid regardless of case.
while True:
key = readchar.readkey()
key = key.lower()
if key in('wsadikjl'):
if 'w' == key:
pass
elif 's' == key:
pass
elif 'a' == key:
pass
elif 'd' == key:
pass
elif 'i' == key:
pass
elif 'k' == key:
pass
elif 'l' == key:
pass
elif 'j' == key:
pass
elif key == readchar.key.CTRL_C:
print("\n Quit")
break