三个按键 三个指示灯 S1-短按 开关LED1 S2--双击--开关LED2 S3--长按 ---调节LED3的亮度 从10%--100%
时间: 2023-12-25 16:29:13 浏览: 72
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根据提供的引用内容,可以通过以下步骤实现三个按键和三个指示灯的功能:
1. 初始化变量和引脚设置:
```python
import RPi.GPIO as GPIO
# 设置按键和指示灯的引脚
button_pin1 = 1 # S1按键引脚
button_pin2 = 2 # S2按键引脚
button_pin3 = 3 # S3按键引脚
led_pin1 = 4 # LED1指示灯引脚
led_pin2 = 5 # LED2指示灯引脚
led_pin3 = 6 # LED3指示灯引脚
# 初始化GPIO设置
GPIO.setmode(GPIO.BCM)
GPIO.setup(button_pin1, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(button_pin2, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(button_pin3, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(led_pin1, GPIO.OUT)
GPIO.setup(led_pin2, GPIO.OUT)
GPIO.setup(led_pin3, GPIO.OUT)
```
2. 定义按键和指示灯的功能函数:
```python
def button1_callback(channel):
# S1按键被按下时的回调函数
GPIO.output(led_pin1, not GPIO.input(led_pin1))
def button2_callback(channel):
# S2按键被按下时的回调函数
GPIO.output(led_pin2, not GPIO.input(led_pin2))
def button3_callback(channel):
# S3按键被按下时的回调函数
# 调节LED3的亮度从10%到100%
for duty_cycle in range(10, 101, 10):
pwm.ChangeDutyCycle(duty_cycle)
time.sleep(0.1)
```
3. 注册按键的事件检测:
```python
GPIO.add_event_detect(button_pin1, GPIO.FALLING, callback=button1_callback, bouncetime=200)
GPIO.add_event_detect(button_pin2, GPIO.FALLING, callback=button2_callback, bouncetime=200)
GPIO.add_event_detect(button_pin3, GPIO.FALLING, callback=button3_callback, bouncetime=200)
```
4. 启动PWM控制LED3的亮度:
```python
pwm = GPIO.PWM(led_pin3, 100) # 设置PWM频率为100Hz
pwm.start(0) # 初始亮度为0%
```
5. 运行主循环:
```python
try:
while True:
pass
except KeyboardInterrupt:
pass
# 清理GPIO设置
GPIO.cleanup()
```
请注意,上述代码是基于树莓派的GPIO库RPi.GPIO进行编写的,需要在树莓派上运行。同时,还需要根据实际的硬件连接情况进行引脚的设置。
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