引脚

R17 G18 B19 GND 四根线

图片

代码

import RPi.GPIOimport timeR, G, B = 17, 18, 19RPi.GPIO.setmode(RPi.GPIO.BCM)RPi.GPIO.setup(R, RPi.GPIO.OUT)RPi.GPIO.setup(G, RPi.GPIO.OUT)RPi.GPIO.setup(B, RPi.GPIO.OUT)pwmR = RPi.GPIO.PWM(R, 70)pwmG = RPi.GPIO.PWM(G, 70)pwmB = RPi.GPIO.PWM(B, 70)pwmR.start(0)pwmG.start(0)pwmB.start(0)try:    t = 0.4    while True:        # 红色灯全亮，蓝灯，绿灯全暗（红色）        pwmR.ChangeDutyCycle(100)        pwmG.ChangeDutyCycle(0)        pwmB.ChangeDutyCycle(0)        time.sleep(t)        # 绿色灯全亮，红灯，蓝灯全暗（绿色）        pwmR.ChangeDutyCycle(0)        pwmG.ChangeDutyCycle(100)        pwmB.ChangeDutyCycle(0)        time.sleep(t)        # 蓝色灯全亮，红灯，绿灯全暗（蓝色）        pwmR.ChangeDutyCycle(0)        pwmG.ChangeDutyCycle(0)        pwmB.ChangeDutyCycle(100)        time.sleep(t)        # 红灯，绿灯全亮，蓝灯全暗（黄色）        pwmR.ChangeDutyCycle(100)        pwmG.ChangeDutyCycle(100)        pwmB.ChangeDutyCycle(0)        time.sleep(t)        # 红灯，蓝灯全亮，绿灯全暗（洋红色）        pwmR.ChangeDutyCycle(100)        pwmG.ChangeDutyCycle(0)        pwmB.ChangeDutyCycle(100)        time.sleep(t)        # 绿灯，蓝灯全亮，红灯全暗（青色）        pwmR.ChangeDutyCycle(0)        pwmG.ChangeDutyCycle(100)        pwmB.ChangeDutyCycle(100)        time.sleep(t)        # 红灯，绿灯，蓝灯全亮（白色）        pwmR.ChangeDutyCycle(100)        pwmG.ChangeDutyCycle(100)        pwmB.ChangeDutyCycle(100)        time.sleep(t)        # 调整红绿蓝LED的各个颜色的亮度组合出各种颜色        for r in range(0, 101, 20):            pwmR.ChangeDutyCycle(r)            for g in range(0, 101, 20):                pwmG.ChangeDutyCycle(g)                for b in range(0, 101, 20):                    pwmB.ChangeDutyCycle(b)                    time.sleep(0.01)except KeyboardInterrupt:    passpwmR.stop()pwmG.stop()pwmB.stop()RPi.GPIO.cleanup()

效果