Python代码：
#!/usr/bin/env python
#*********************************************************
#File Name ：rgb.py
#Author ：Jason Dai
#Date : /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): # 将一个数从一个区间线性映射到另一个区间，比如将0~100之间的一个数映射到0~255之间
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()运行程序：
python rgb.py
