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https://www.zhihu.com/video/950751399873560576 Flowing Lights树莓派流水灯制作
Introduction
此章我们将会学习如何让八个LED产生你想要的多种闪烁效果,当然,还是在树莓派的基础上进行试验。
What you will need
- 树莓派×1
- 线路板×1
- 网络电缆×1
- LED×8
- 电阻(220Ω)×8
- 跳线
Experimental Principle(实验原理)
通过编程由上到下依次设置GPIO0至GPIO7,然后你会看到LED0至LED7被依次点亮。你可以通过控制它们的延迟时间和点亮顺序使得八个LED闪烁出不同的效果。
Python Code(Python 语言)
#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
pins = [11, 12, 13, 15, 16, 18, 22, 7]
def setup():
GPIO.setmode(GPIO.BOARD) # Numbers GPIOs by physical location
for pin in pins:
GPIO.setup(pin, GPIO.OUT) # Set all pins' mode is output
GPIO.output(pin, GPIO.HIGH) # Set all pins to high(+3.3V) to off led
def loop():
while True:
for pin in pins:
GPIO.output(pin, GPIO.LOW)
time.sleep(0.5)
GPIO.output(pin, GPIO.HIGH)
def destroy():
for pin in pins:
GPIO.output(pin, GPIO.HIGH) # turn off all leds
GPIO.cleanup() # Release resource
if __name__ == '__main__': # Program start from here
setup()
try:
loop()
except KeyboardInterrupt: # When 'Ctrl+C' is pressed, the child program destroy() will be executed.
destroy()
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