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DHT 11 sensor not found, check wiring

Account cancelled 2020-11-03 15:06:19 3323 Views1 Replies
I am using raspberry pi 4 model b and sensor DHT 11 for checking the humidity and temperature. When I am using the codehttp://abyz.me.uk/rpi/pigpio/code/DHT.py, the result is:
Code: Select all
1604263139.922 4 3 0.0 0.0 1604263142.192 4 3 0.0 0.0 1604263144.463 4 3 0.0 0.0 1604263146.732 4 3 0.0 0.0 1604263149.002 4 3 0.0 0.0 1604263151.273 4 3 0.0 0.0 1604263153.544 4 3 0.0 0.0 1604263155.816 4 3 0.0 0.0

ut when I run my own code by using the command of
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python3 q1.py -f 5 -p 20 -o test.csv

:
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from board import D4 import adafruit_dht import argparse import datetime parser = argparse.ArgumentParser() parser.add_argument('-f',type=float) parser.add_argument('-p',type=float) parser.add_argument('-o',type=str) args = parser.parse_args() num_samples = int(args.p / args.f ) dht_device = adafruit_dht.DHT11(D4) fp = open(args.o, 'w') for i in range(num_samples): now = datetime.datetime.now() temperature = dht_device.temperature humidity = dht_device.humidity ptint(now.day,temperature,humidity,file = fp) time.sleep(args.f) fp.close()

the error is :
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Traceback (most recent call last): File "q1.py", line 23, in <module> temperature = dht_device.temperature File "/home/pi/WORK_DIR/py37/lib/python3.7/site-packages/adafruit_dht.py", line 253, in temperature self.measure() File "/home/pi/WORK_DIR/py37/lib/python3.7/site-packages/adafruit_dht.py", line 205, in measure raise RuntimeError("DHT sensor not found, check wiring") RuntimeError: DHT sensor not found, check wiring

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	1604263139.922 4 3 0.0 0.0
	1604263142.192 4 3 0.0 0.0
	1604263144.463 4 3 0.0 0.0
	1604263146.732 4 3 0.0 0.0
	1604263149.002 4 3 0.0 0.0
	1604263151.273 4 3 0.0 0.0
	1604263153.544 4 3 0.0 0.0
	1604263155.816 4 3 0.0 0.0

	from board import D4
	import adafruit_dht
	import argparse
	import datetime

	parser = argparse.ArgumentParser()

	parser.add_argument('-f',type=float)
	parser.add_argument('-p',type=float)
	parser.add_argument('-o',type=str)

	args = parser.parse_args()

	num_samples = int(args.p / args.f )


	dht_device = adafruit_dht.DHT11(D4)

	fp = open(args.o, 'w')

	for i in range(num_samples):
	now = datetime.datetime.now()
	temperature = dht_device.temperature
	humidity = dht_device.humidity
	ptint(now.day,temperature,humidity,file = fp)
	time.sleep(args.f)

	fp.close()

	Traceback (most recent call last):
	File "q1.py", line 23, in <module>
	temperature = dht_device.temperature
	File "/home/pi/WORK_DIR/py37/lib/python3.7/site-packages/adafruit_dht.py", line 253, in temperature
	self.measure()
	File "/home/pi/WORK_DIR/py37/lib/python3.7/site-packages/adafruit_dht.py", line 205, in measure
	raise RuntimeError("DHT sensor not found, check wiring")
	RuntimeError: DHT sensor not found, check wiring