Question

我正在尝试将SG90伺服系统用作RC汽车的转向装置，我已经成功使它响应A（左）和D（右），但是几秒钟不输入任何指令后，它停止了响应并以一定角度锁定。

import RPi.GPIO as GPIO
import pigpio
GPIO.setmode(GPIO.BOARD)
from time import sleep
import sys, tty, termios, time
import time
from pynput import keyboard

GPIO.setwarnings(False)
GPIO.setup(07, GPIO.OUT)
pwm=GPIO.PWM(07, 50)
pwm.start(7.5)

def getch():
    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





def steering():
    i = 1
    while i == 1:

        char = getch()
        if(char == "a"):
            pwm.ChangeDutyCycle(12.5)
            print (" Left ")
        if(char == "d"):
            pwm.ChangeDutyCycle(2.5)
            print (" Right ")
        if(char == "x"):
            print(" Program Ended ")
            break

steering()
GPIO.cleanup()

几秒钟后，RPi伺服器停止响应python代码

0 个答案: