raspberry pi (3) RGB-LED

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/guzhou_diaoke/article/details/88858602

1. GPIO号
2. 代码

#!/usr/bin/env python
import RPi.GPIO as GPIO 
import time
import random

pins = {'pin_R': 11, 'pin_G': 12, 'pin_B': 13}

GPIO.setmode(GPIO.BOARD)            # Numbers GPIOs by physical location
for i in pins:
    GPIO.setup(pins[i], GPIO.OUT)   # Set pins' mode is output
    GPIO.output(pins[i], GPIO.HIGH) # Set pins to high(+3.3V) to off led 
p_R = GPIO.PWM(pins['pin_R'], 100)
p_G = GPIO.PWM(pins['pin_G'], 100)
p_B = GPIO.PWM(pins['pin_B'], 100)
    

p_R.start(100)      # Initial duty Cycle = 0(leds off)
p_G.start(100)
p_B.start(100)


def off():
    for i in pins:
        GPIO.output(pins[i], GPIO.HIGH)    # Turn off all leds

def loop(): 
    while True:
        r = random.randint(0, 100)
        g = random.randint(0, 100)
        b = random.randint(0, 100)
        p_R.ChangeDutyCycle(r)
        p_G.ChangeDutyCycle(g)
        p_B.ChangeDutyCycle(b)
        time.sleep(1)

def destroy():
    p_R.stop()
    p_G.stop()
    p_B.stop()
    off()   
    GPIO.cleanup()

if __name__ == "__main__":
    try:    
        loop()
    except KeyboardInterrupt:
        destroy()

3. 结果