计时器不跳到默认值或下一个

Question

在下面的代码中。代码确实运行所有单独的行。 区间1线路将在21.00和21.05小时之间运行 区间2线路将在22.00和22.05小时之间运行 标准脉冲线将在所有其他时间段上运行

问题： 代码不存在，即不从间隔1跳转->；标准脉冲->；间隔2等。它保持代码开始运行的时间范围

有人能帮我解决这个时间问题吗

代码如下：

from __future__ import division
from datetime import datetime, time

# Import the PCA9685 module.
import Adafruit_PCA9685

now = datetime.now()

# Initialise the PWM device using the default address
pwm = Adafruit_PCA9685.PCA9685()
# Note if you'd like more debug output you can instead run:
#pwm = PWM(0x40, debug=True)

servo_min = 300  # Min pulse length out of 4096
servo_max = 600  # Max pulse length out of 4096

def setServoPulse(channel, pulse):
  pulseLength = 1000000                   # 1,000,000 us per second
  pulseLength /= 60                       # 60 Hz
  print "%d us per period" % pulseLength
  pulseLength /= 4096                     # 12 bits of resolution
  print "%d us per bit" % pulseLength
  pulse *= 1000
  pulse /= pulseLength
  pwm.set_pwm(channel, 0, pulse)

# Set frequency to 60hz, good for servos.
pwm.set_pwm_freq(60)

while True:
    if now.time() >= time(21, 00, 00) and now.time() <= time(21, 05, 0):
        print "Interval 1"
        pwm.set_pwm(0, 0, servo_min)
    elif now.time() >= time(22, 00, 0) and now.time() <= time(22, 05, 0):
        print "Interval 2"
        pwm.set_pwm(0, 0, servo_min)
    else:
       print "Standard pulse"
       pwm.set_pwm(0, 0, servo_max)

Answer 1

根据文档，datetime.now()返回当前时间，因此在now中，变量总是只在启动程序时存储。试着把now = datetime.now()放在while循环的顶部

...
# Set frequency to 60hz, good for servos.
pwm.set_pwm_freq(60)

while True:
    now = datetime.now()
    if now.time() >= time(21, 00, 00) and now.time() <= time(21, 05, 0):
        print "Interval 1"
        pwm.set_pwm(0, 0, servo_min)
    elif now.time() >= time(22, 00, 0) and now.time() <= time(22, 05, 0):
        print "Interval 2"
        pwm.set_pwm(0, 0, servo_min)
    else:
        print "Standard pulse"
        pwm.set_pwm(0, 0, servo_max)