最近一直在研究树莓派的 GPIO，传感器很简单，就是检测高电平和低电平，于是就写了下面这个传感器组合程序，选择传感器的 BORARD 通道号和输出通道号，在选择模式（土壤传感器，雨水传感器，光线传感器，人体传感器）程序就会运行。

#!/usr/bin/python
# -*- coding: UTF-8 -*-

channel = input("请输入传感器BOARD通道号：")
light = input("请输入灯光BOARD通道号：")
chosemode = input('请选择模式: \n(1.土壤 2.雨水 3.光线 4.人体)')

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BOARD)
GPIO.setup(channel, GPIO.IN)
GPIO.setup(light, GPIO.OUT)

if chosemode == 1:
    mode = "土壤"
    out1 = "潮湿"
    out2 = "干燥"

if chosemode == 2:
    mode = "雨水"
    out1 = "有雨"
    out2 = "无雨"

if chosemode == 3:
    mode = "光线"
    out1 = "有光"
    out2 = "无光"

if chosemode == 4:
    mode = "人体"
    out1 = "有人"
    out2 = "无人"

try:
    while True:
        if GPIO.input(channel) == GPIO.LOW:
            nowtime = time.strftime('%m-%d %H:%M:%S',time.localtime(time.time()))
            print(nowtime)
            print(mode + "检测结果：" + out1)
            GPIO.output(light, GPIO.LOW)
        else:
            nowtime = time.strftime('%m-%d %H:%M:%S',time.localtime(time.time()))
            print(nowtime)
            print(mode + "检测结果：" + out2)
            GPIO.output(light, GPIO.HIGH)
        time.sleep(5)

except KeyboardInterrupt:
    GPIO.cleanup()
    print("已取消")