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- 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()
复制代码
为啥要设置color的元祖,意义有什么作用还有PWM控制的频率为啥设置这个数值 |
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