import RPi.GPIO as GPIO
import time

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

GPIO.setmode(GPIO.BCM)  # 以BCM编码格式

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:
    print("----------------low1---------------")
    continue

while GPIO.input(channel) == GPIO.HIGH:
    print("----------------high---------------")
    continue

#signal get
while j < 40:
    k = 0
    while GPIO.input(channel) == GPIO.LOW:
        print("----------------low2---------------")
        continue

    while GPIO.input(channel) == GPIO.HIGH:
        k += 1
        if k > 100:
            break
    print("----------------k="+str(k)+"---------------")
    if k < 38:
        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
print(len(data))  # 长度

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()