电路连接方式请参考另一篇博文:【用树莓派实现RGB LED的颜色控制——C语言版本】
Python代码:
#!/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): # 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
时间: 2024-10-10 09:19:31