Temperature and Humidity Sensor - DHT11
Hi! We are hoping you can help us troubleshoot the DHT11. We have built the curcuit. We have troubleshot the Python Code, added parenthesis around the print statements, and run the code in Thonny. We get the following output:Python 3.7.3 (/usr/bin/python3)
>>> %cd '/home/pi/Adeept Experiments/Adeept_Ultimate_Starter_Kit_for_RPi_V1.1/code/Adeept_Ultimate_Starter_Kit_Python_Code_for_RPi-master'
>>> %Run 15_dht11.py
sensor is working.
wrong
temperature :255 , humidity :127check :255tmp :876
The code is not commented so I don't understand the different parts and can make no sense out of this output. I tried upading the *.py and a *.txt but it's not allowed. So, here's the code in its entirety:
#!/usr/bin/python
import RPi.GPIO as GPIO
import time
channel = 18
data = []
j = 0
GPIO.setmode(GPIO.BCM)
time.sleep(1)
GPIO.setup(channel, GPIO.OUT)
GPIO.output(channel, GPIO.LOW)
time.sleep(0.02)
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)
humidity_bit = data
humidity_point_bit = data
temperature_bit = data
temperature_point_bit = data
check_bit = data
humidity = 0
humidity_point = 0
temperature = 0
temperature_point = 0
check = 0
for i in range(8):
humidity += humidity_bit * 2 ** (7 - i)
humidity_point += humidity_point_bit * 2 ** (7 - i)
temperature += temperature_bit * 2 ** (7 - i)
temperature_point += temperature_point_bit * 2 ** (7 - i)
check += check_bit * 2 ** (7 - i)
tmp = humidity + humidity_point + temperature + temperature_point
if check == tmp:
print ("temperature : ", temperature, ", humidity : " , humidity)
else:
print ("wrong")
print ("temperature : ", temperature, ", humidity : " , humidity, " check : ", check, " tmp : ", tmp)
GPIO.cleanup()
Rebuilt the circuit and ran from the terminal emulator peer the manual. Same results. The supporting manual has been updated, please download it through the link below: https://www.adeept.com/learn/detail-47.html
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