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# 使用方法： 接线 DHT11的三个引脚(如果是四个引脚NC不连接) VCC接5V GND接地 数据D接任意树莓派GPIO口
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# 并将数据D接的树莓派GPIO口BCM编号设置为下面的pin
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# 然后你可以直接运行本文件得到数值，也可以使用import dht11_drive导入模块
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# 导入后使用 dht11_drive.dht11() 函数获取湿度与温度 返回值是一个元组
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import RPi.GPIO as GPIO
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import time
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import jiqiren as jqr
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import MySQL as m
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def celiang(pin):
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GPIO.setup(pin, GPIO.OUT) # 設置引腳輸出
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GPIO.output(pin, True) # 高电平
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# 树莓派下拉19ms
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GPIO.output(pin, False)
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time.sleep(0.02)
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# GPIO.output(pin,True)
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GPIO.setup(pin, GPIO.IN) # 设置引腳输入
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time_data_list = [] # 保存数据（高电平持续）时间的列表
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pan_duan = 1 # 判断数据是否正确
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end_times = 0 # 数据是否接收完毕 决定是否结束大循环
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start_time = 0 # 防止start_time未定义
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end_time = 0 # 防止end_time未定义
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while 1:
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start_time_total = time.time() # 记录每次运行循环开始时间
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if end_times == 1: # 数据接收完毕
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break
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while GPIO.input(pin) == 0: # 等待电平不为低
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start_time = time.time() # 得到高电平开始时间
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if (start_time - start_time_total) > 0.1: # 判断循环时间过长 电平已经不再变化
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end_times = 1
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break
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while GPIO.input(pin) == 1: # 等待电平不为高
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end_time = time.time() # 得到高电平结束时间
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if (end_time - start_time_total) > 0.1: # 判断循环时间过长 电平已经不再变化
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end_times = 1
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break
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time_data = end_time - start_time # 计算出高电平持续时间
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time_data_list.append(time_data) # 高电平持续时间数据写入列表
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# print(str(time_data)+', ', end='')
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# print(time_data_list)
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# print(len(time_data_list))
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new_time_data_list = [] # 保存筛选过的时间
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for i in range(len(time_data_list)):
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if (time_data_list[i] > 1.9e-5) and (time_data_list[i] < 7.8e-5):
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new_time_data_list.append(time_data_list[i])
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# print(new_time_data_list)
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# print(len(new_time_data_list))
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if len(new_time_data_list) != 40:
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pan_duan = 0 # 判断数据是否正确
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return pan_duan, '接收到的数据位数不足，请重新尝试'
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if pan_duan == 1: # 判断数据是否正确
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Binary_list = [] # 保存二进制数据
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for i in new_time_data_list:
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if i > 5.0e-5:
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Binary_list.append(1)
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elif i < 5.0e-5:
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Binary_list.append(0)
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if len(Binary_list) != 40:
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pan_duan = 0 # 判断数据是否正确
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return pan_duan, '数据位数不足，请重新尝试'
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# print(Binary_list)
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# print(len(Binary_list))
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if pan_duan == 1: # 判断数据是否正确
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# 转字符串格式
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str_Binary_list = []
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for i in Binary_list:
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str_Binary_list.append(str(i))
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if pan_duan == 1: # 判断数据是否正确
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# 分割数据 并合并成字符串
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# 共40位数据 0-8为湿度整数 9-16为湿度小数 17-24为温度整数 25-32为湿度小数 33-40为校验和（前四个数据直接相加）
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str_shidu_zhengshu = ''.join(str_Binary_list[0:8])
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str_shidu_xiaoshu = ''.join(str_Binary_list[8:16])
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str_wendu_zhengshu = ''.join(str_Binary_list[16:24])
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str_wendu_xiaoshu = ''.join(str_Binary_list[24:32])
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str_yanzheng = ''.join(str_Binary_list[32:40])
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# 转换为十进制
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int_shidu_zhengshu = int(str_shidu_zhengshu, 2)
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int_shidu_xiaoshu = int(str_shidu_xiaoshu, 2)
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int_wendu_zhengshu = int(str_wendu_zhengshu, 2)
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int_wendu_xiaoshu = int(str_wendu_xiaoshu, 2)
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int_yanzheng = int(str_yanzheng, 2)
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if int_yanzheng != (int_shidu_zhengshu + int_shidu_xiaoshu + int_wendu_zhengshu + int_wendu_xiaoshu):
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pan_duan = 0 # 数据不正确
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return pan_duan, '校验和不匹配，请重新尝试'
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if int_yanzheng == (int_shidu_zhengshu + int_shidu_xiaoshu + int_wendu_zhengshu + int_wendu_xiaoshu):
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pan_duan = 1 # 数据正确
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str_shidu = str(int_shidu_zhengshu) + '.' + str(int_shidu_xiaoshu)
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str_wendu = str(int_wendu_zhengshu) + '.' + str(int_wendu_xiaoshu)
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float_shidu = float(str_shidu)
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float_wendu = float(str_wendu)
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return pan_duan, (float_shidu, float_wendu) # 返回 湿度 温度
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def dht11(pin): # 循环五次
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for i in range(5):
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pan_duan_01, return_data = celiang(pin)
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if pan_duan_01 == 1:
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return return_data
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# time.sleep(0.5)
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# print('错误')
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return 0, 0
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def wsd():
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#############################################################
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pin = 4 # 这里填写GPIO号（BCM引脚编号模式） 手动改变此行
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#############################################################
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GPIO.setmode(GPIO.BCM) # 设置使用BCM引脚编号模式
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while True:
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shidu, wendu = dht11(pin)
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if shidu and wendu:
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num = m.th_select("max(number)")[0][0]+1
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t = time.strftime('%Y-%m-%d %H:%M:%S')
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m.th_insert(str(num), t, str(wendu), str(shidu)) # 将数据保存至数据库
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text = '湿度为' + str(shidu) + '%' + '，温度为' + str(wendu) + '℃。'
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print("小溪说:", text)
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txt = '湿度为百分之' + str(shidu) + '，温度为' + str(wendu) + '摄氏度。'
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jqr.robotSay.say(txt)
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GPIO.cleanup(pin)
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break
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else:
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continue
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GPIO.cleanup(pin)
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