Python代碼：

#!/usr/bin/env python

#*********************************************************

#File Name ：rgb.py

#Author ：Jason Dai

#Date : 2015/02/04

#*********************************************************

import RPi.GPIO as GPIO

import time

colors = [0xFF0000, 0x00FF00, 0x0000FF, 0xFFFF00, 0xFF00FF, 0x00FFFF, 0xFFFFFF, 0x9400D3]

pins = {'pin_R':11, 'pin_G':12, 'pin_B':13} # pins is a dict

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'], 2000)

p_B = GPIO.PWM(pins['pin_B'], 5000)

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

p_G.start(100)

p_B.start(100)

def map(x, in_min, in_max, out_min, out_max): # 將一個數從一個區間線性映射到另一個區間，比如將0~100之間的一個數映射到0~255之間

return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min

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) # change a num(0~255) to 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)

try:

while True:

for col in colors:

setColor(col)

time.sleep(0.5)

except KeyboardInterrupt:

p_R.stop()

p_G.stop()

p_B.stop()

for i in pins:

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

GPIO.cleanup()運行程序：

python rgb.py

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