SunFounder PiSloth, Manual

Page: 79 / 105

SunFounder pisloth
(continued from previous page)
print (manual)
while True :
key = readchar()
# print(key)
if key == "w" :
sloth . do_action( 'forward' , 1 , 90 )
elif key == "a" :
sloth . do_action( 'turn left' , 1 , 90 )
elif key == "s" :
sloth . do_action( 'backward' , 1 , 90 )
elif key == "d" :
sloth . do_action( 'turn right' , 1 , 90 )
elif key == "1" :
music . sound_effect_play( './sounds/talk1.wav' )
elif
key == "2" :
music . sound_effect_play( './sounds/talk2.wav' )
elif key == "3" :
music . sound_effect_play( './sounds/talk3.wav' )
elif key == "4" :
music . sound_effect_play( './sounds/depress.wav' )
elif key == "q" :
tts . say( "Oh hello there" )
elif key == "e" :
tts . say( "bye" )
elif key == chr ( 27 ): # 27 for ESC
break
time . sleep( 0.05 )
print ( " \n Quit" )
if __name__ == "__main__" :
main()
How it works?
This function refers to the standard input stream and returns the first character of the data stream read.
•
tty.setraw(sys.stdin.fileno)
is to change the standard input stream to raw mode, that is, all char-
acters will not be escaped during transmission, including special characters. Before changing the mode, back
up the original mode, and restore it after the change.
•
old_settings = termios.tcgetattr(fd)
and
termios.tcsetattr(fd, termios.
TCSADRAIN, old_settings)
plays the role of backup and restore.
def readchar ():
fd = sys . stdin . fileno()
old_settings = termios . tcgetattr(fd)
try :
tty . setraw(sys . stdin . fileno())
ch = sys . stdin . read( 1 )
finally :
termios . tcsetattr(fd, termios . TCSADRAIN, old_settings)
return ch
Finally, according to the read keyboard characters, let PiSloth do the actions we set, call the tts.say() function to
speak or play the sound effects prepared in advance.
4.8. Remote Control 75