一、接线图
按照下图将RGB LED接到树莓派上。
二、Python程序
#!/usr/bin/env python import RPi.GPIO as GPIO import time colors = [0xFF0000, 0x00FF00, 0x0000FF, 0xFFFF00, 0xFF00FF, 0x00FFFF] R = 11 G = 12 B = 13 def setup(Rpin, Gpin, Bpin): global pins global p_R, p_G, p_B pins = {'pin_R': Rpin, 'pin_G': Gpin, 'pin_B': Bpin} 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'], 2000) # set Frequece to 2KHz p_G = GPIO.PWM(pins['pin_G'], 1999) p_B = GPIO.PWM(pins['pin_B'], 5000) p_R.start(100) # Initial duty Cycle = 0(leds off) p_G.start(100) p_B.start(100) def map(x, in_min, in_max, out_min, out_max): return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min def off(): for i in pins: GPIO.output(pins[i], GPIO.HIGH) # Turn off all leds def setColor(col): # For example : col = 0x112233 R_val = (col & 0xff0000) >> 16 G_val = (col & 0x00ff00) >> 8 B_val = (col & 0x0000ff) >> 0 R_val = map(R_val, 0, 255, 0, 100) G_val = map(G_val, 0, 255, 0, 100) B_val = map(B_val, 0, 255, 0, 100) p_R.ChangeDutyCycle(100-R_val) # Change duty cycle p_G.ChangeDutyCycle(100-G_val) p_B.ChangeDutyCycle(100-B_val) def loop(): while True: for col in colors: setColor(col) time.sleep(1) def destroy(): p_R.stop() p_G.stop() p_B.stop() off() GPIO.cleanup() if __name__ == "__main__": try: setup(R, G, B) loop() except KeyboardInterrupt: destroy()
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访客
回复好好学习