树莓派 感光声控灯

rpi-pins-40-0.png

使用board编码

两个传感器的vcc与gnd分别接入正极3.3v与负极,传感器的out针脚接入树莓派gpio针脚

传感器out针脚接入树莓派的针脚号，out针脚是输出传感器数据
光感： 19
声感： 21
led灯：正极37，负极34接地

#!/usr/bin/env python
# encoding: utf-8
import RPi.GPIO as GPIO
import time

# LED正极连接的GPIO
LED = 37
# 声音感应器OUT口连接的GPIO
# 光感
SENSOR = 19
# 声感
SENSOR21 = 21

# 当前LED灯的开关状?
flg = False

GPIO.setmode(GPIO.BOARD)

# 指定GPIO4（声音感应器的OUT口连接的GPIO口）的模式为输入模式
# 默认拉高到高电平，低电平表示OUT口有输出
GPIO.setup(SENSOR, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(SENSOR21, GPIO.IN, pull_up_down=GPIO.PUD_UP)

# 指定GPIO17（LED长针连接的GPIO针脚）的模式为输出模
GPIO.setup(LED, GPIO.OUT)

GPIO.output(LED, 1)
time.sleep(1)
GPIO.output(LED, 0)

# 当内部作用域想修改外部作用域的变量时，就要用到global和nonlocal关键字了
num = 0


def callback(channel):
    global num
    # 检测声音感应器是否输出低电平，若是低电平，表示声音被检测到，点亮或关闭LED
    print(channel, GPIO.input(SENSOR), GPIO.input(SENSOR21))
    num += 1
    print(num)
    # if (GPIO.input(SENSOR) == 1 and GPIO.input(SENSOR21) == 0):

    # 如果没有灯光,触发点亮led
    if (GPIO.input(SENSOR) == 1):
        GPIO.output(LED, 1)
        # 稍微延时一会，避免刚点亮就熄灭，或者刚熄灭就点亮
        time.sleep(0.1)
        GPIO.output(LED, 0)


# 监听光感
GPIO.add_event_detect(SENSOR, GPIO.RISING, callback)
# 监听声控
GPIO.add_event_detect(SENSOR21, GPIO.RISING, callback, bouncetime=200)


while True:
    time.sleep(10)

GPIO.cleanup()

附上温湿度传感器

#!/usr/bin/python
# encoding: utf-8
import RPi.GPIO as GPIO
import time

channel = 37  # 引脚号16
data = []  # 温湿度值
j = 0  # 计数器

GPIO.setmode(GPIO.BOARD) 
time.sleep(1)  # 时延一秒

GPIO.setup(channel, GPIO.OUT)

GPIO.output(channel, GPIO.LOW)
time.sleep(0.02)  # 给信号提示传感器开始工作
GPIO.output(channel, GPIO.HIGH)

GPIO.setup(channel, GPIO.IN)

while GPIO.input(channel) == GPIO.LOW:
    continue

while GPIO.input(channel) == GPIO.HIGH:
    continue

while j < 40:
    k = 0
    while GPIO.input(channel) == GPIO.LOW:
        continue

    while GPIO.input(channel) == GPIO.HIGH:
        k += 1
        if k > 100:
            break

    if k < 8:
        data.append(0)
    else:
        data.append(1)

    j += 1

print "sensor is working."
print data  # 输出初始数据高低电平

humidity_bit = data[0:8]  # 分组
humidity_point_bit = data[8:16]
temperature_bit = data[16:24]
temperature_point_bit = data[24:32]
check_bit = data[32:40]

humidity = 0
humidity_point = 0
temperature = 0
temperature_point = 0
check = 0

for i in range(8):
    humidity += humidity_bit[i] * 2 ** (7 - i)  # 转换成十进制数据
    humidity_point += humidity_point_bit[i] * 2 ** (7 - i)
    temperature += temperature_bit[i] * 2 ** (7 - i)
    temperature_point += temperature_point_bit[i] * 2 ** (7 - i)
    check += check_bit[i] * 2 ** (7 - i)

tmp = humidity + humidity_point + temperature + temperature_point  # 十进制的数据相加

if check == tmp:  # 数据校验，相等则输出
    print "temperature : ", temperature, ", humidity : ", humidity
else:  # 错误输出错误信息，和校验数据
    print "wrong"
    print "temperature : ", temperature, ", humidity : ", humidity, " check : ", check, " tmp : ", tmp

GPIO.cleanup()  # 重置针脚