樹莓派(Raspberry Pi)從零開始 -8. LED閃爍實驗

Posted on by post01

目錄

  1. 實驗概述
  2. 實驗原理
  3. 代碼編寫

1.實驗概述

使用樹莓派上的pythonm語言，編寫出一個小程式，控制PWR.A53板上的三個LED燈閃爍，經由這個實驗，可以學到最基本的1/0口控制，延時函數，python控制樹莓派IO工作原理等。

2.實驗原理

LED燈是一種基本的發光器，給它輸入5V電壓時，它就會亮，給它0V時它就熄滅，這次實驗，利用PWR.A53板上的LED燈LED0、LED1、LED2三個燈，這三個燈分別接到10、9、25三個IO管腳(BCM模式)，只要在程式裡改變那些腳位輸出電流，就可以讓LED燈閃爍的效果。下方圖示為腳位分布圖

3.代碼編寫

  • 設定LED的腳位(LED0=10)
  • 將GPIO設定為輸出模式，和起始電流(HIGH)或( LOW)
  • 代碼為: GPIO.steup(LED0, GPIO.OUT,initia= GPIO.HIGH )
  • 使用GPIO.output()函數，把LED0這個腳位電流拉低
  • 代碼為: GPIO.output(LED0,False)

程式如下

import time

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)

LED0=10

LED1=9

LED2=25

GPIO.setwarnings(False)

GPIO.setup(LED0,GPIO.OUT,initial=GPIO.HIGH)##led

GPIO.setup(LED1,GPIO.OUT,initial=GPIO.HIGH)##led

GPIO.setup(LED2,GPIO.OUT,initial=GPIO.HIGH)##led

def init_light():

        GPIO.output(LED0,False)

        GPIO.output(LED1,False)

        GPIO.output(LED2,False)

        time.sleep(0.5)

        GPIO.output(LED0,True)

        GPIO.output(LED1,False)

        GPIO.output(LED2,False)

        time.sleep(0.5)

        GPIO.output(LED0,False)

        GPIO.output(LED1,True)

        GPIO.output(LED2,False)

        time.sleep(0.5)

        GPIO.output(LED0,False)

        GPIO.output(LED1,False)

        GPIO.output(LED2,True)

        time.sleep(0.5)

        GPIO.output(LED0,False)

        GPIO.output(LED1,False)

        GPIO.output(LED2,False)

        time.sleep(0.5)

        GPIO.output(LED0,False)

        GPIO.output(LED1,False)

        GPIO.output(LED2,False)

for i in range(1,5):

        init_light()

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