我正在尝试使用raw_input函数键入l或r这样的字母，它将是某个pwm值，如0.4或{ {1}}。这是我的代码：
1.6我还有另一个用import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.cleanup()
enable_pin = 18
coil_A_1_pin = 27
coil_A_2_pin = 17
coil_B_1_pin = 23
coil_B_2_pin = 24
coil_A_x1_pin = 22
coil_A_x2_pin = 5
coil_B_x1_pin = 6
coil_B_x2_pin = 13
s = 12
GPIO.setup(enable_pin, GPIO.OUT)
GPIO.setup(coil_A_1_pin, GPIO.OUT)
GPIO.setup(coil_A_2_pin, GPIO.OUT)
GPIO.setup(coil_B_1_pin, GPIO.OUT)
GPIO.setup(coil_B_2_pin, GPIO.OUT)
GPIO.setup(coil_A_x1_pin, GPIO.OUT)
GPIO.setup(coil_A_x2_pin, GPIO.OUT)
GPIO.setup(coil_B_x1_pin, GPIO.OUT)
GPIO.setup(coil_B_x2_pin, GPIO.OUT)
GPIO.setup(s, GPIO.OUT)
GPIO.output(enable_pin, 1)
def forward(delay, steps):
for i in range(0, steps):
setStep(1, 1, 0, 0)
time.sleep(delay)
setStep(0, 1, 1, 0)
time.sleep(delay)
setStep(0, 0, 1, 1)
time.sleep(delay)
setStep(1, 0, 0, 1)
time.sleep(delay)
def backwards(delay, steps):
for i in range(0, steps):
setStep(1, 0, 0, 1)
time.sleep(delay)
setStep(0, 0, 1, 1)
time.sleep(delay)
setStep(0, 1, 1, 0)
time.sleep(delay)
setStep(1, 1, 0, 0)
time.sleep(delay)
def setStep(w1, w2, w3, w4):
GPIO.output(coil_A_1_pin, w1)
GPIO.output(coil_A_x1_pin, w1)
GPIO.output(coil_A_2_pin, w2)
GPIO.output(coil_A_x2_pin, w2)
GPIO.output(coil_B_1_pin, w3)
GPIO.output(coil_B_x1_pin, w3)
GPIO.output(coil_B_2_pin, w4)
GPIO.output(coil_B_x2_pin, w4)
p = GPIO.PWM(s,7.5)
try:
while True:
l = 0.3
r = 1.7
n = 1.1
pos = raw_input("Left(l), right(r) or neutral(n)? ")
p.ChangeDutyCycle(float(pos))
delay = raw_input("Delay between steps (milliseconds)? ")
steps = raw_input("How many steps forward? ")
forward(int(delay) / 1000.0, int(steps))
steps = raw_input("How many steps backwards? ")
backwards(int(delay) / 1000.0, int(steps))
except KeyboardInterrupt:
GPIO.cleanup()
执行此操作的程序，但我无法弄清楚如何在开发模式chromebook上使用ssh，所以我放弃了。另外不要介意我正在运行的步进电机的所有pygame和其他东西。步进电机工作正常，因为我直接输入数字而不是变量，但我无法弄清楚如何使它与变量一起工作。如果有人告诉我如何在chromebook上运行pygame，这会让它变得更容易，那就太棒了！
答案 0 :(得分：0)
对于变量pos，您应该使用input而不是raw_input。
基本上s = input('Say: ')与
s = eval( raw_input('Say: ') )
即。给定的输入字符串将评估。然后你甚至不需要漂浮它。