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已将 DHT11 连接到 Rpi4。

VCC--引脚 1

数据引脚--gpio4

接地引脚--引脚 6

它工作得很好，但是在给出了几次结果之后，我得到了这个错误。pigpio 新手，请帮我找出问题所在

import time
from pigpio_dht import DHT11, DHT22
while True:
        gpio = 4 # BCM Numbering

        sensor = DHT11(gpio)
#sensor = DHT22(gpio)

        result = sensor.read()

        temperature=([value for value in result.values()][0])
        print(temperature)

        humidity=([value for value in result.values()][2])
        print(humidity)
        time.sleep(10)

输出：

28
46

28
46

28
46

28
46

28
46

然后我得到以下信息：


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Can't connect to pigpio at localhost(8888)

Can't create callback thread.
Perhaps too many simultaneous pigpio connections.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Traceback (most recent call last):
  File "dht8.py", line 9, in <module>
    sensor = DHT11(gpio)
  File "/home/pi/.local/lib/python3.7/site-packages/pigpio_dht/dht11.py", line 24, in __init__
    super(DHT11, self).__init__(gpio, pi=pi, timeout_secs=timeout_secs, use_internal_pullup=True, max_read_rate_secs=1, datum_byte_count=1)
  File "/home/pi/.local/lib/python3.7/site-packages/pigpio_dht/dhtxx.py", line 47, in __init__
    self._pi.set_pull_up_down(gpio, pigpio.PUD_UP)
  File "/usr/lib/python3/dist-packages/pigpio.py", line 1385, in set_pull_up_down
    return _u2i(_pigpio_command(self.sl, _PI_CMD_PUD, gpio, pud))
  File "/usr/lib/python3/dist-packages/pigpio.py", line 993, in _pigpio_command
    sl.s.send(struct.pack('IIII', cmd, p1, p2, 0))
AttributeError: 'NoneType' object has no attribute 'send'

提前致谢

4

1 回答 1

1

您正在循环内设置设备while，因此它会创建同一设备的多个实例，因此会出现错误代码

Can't create callback thread.
Perhaps too many simultaneous pigpio connections.

您需要创建一个设备实例并长期从传感器读取信息。像这样的东西会起作用：

import time
from pigpio_dht import DHT11, DHT22

gpio = 4 # BCM Numbering

sensor = DHT11(gpio)
   
while True:
       
        result = sensor.read()

        temperature=([value for value in result.values()][0])
        print(temperature)

        humidity=([value for value in result.values()][2])
        print(humidity)
        time.sleep(10)
于 2021-03-11T13:03:47.913 回答