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Description
I'm using DHT11 on Rpi 4B and I turn to using Adafruit_CircuitPython_DHT today from Adafruit_Python_DHT. I had changed my code to fit the Adafruit_CircuitPython_DHT, but when I run it I meet this error:
Traceback (most recent call last):
File "tmpv0.2.py", line 44, in <module>
main()
File "tmpv0.2.py", line 23, in main
temperature = dht_device.temperature
File "/usr/local/lib/python3.8/dist-packages/adafruit_dht.py", line 253, in temperature
self.measure()
File "/usr/local/lib/python3.8/dist-packages/adafruit_dht.py", line 205, in measure
raise RuntimeError("DHT sensor not found, check wiring")
RuntimeError: DHT sensor not found, check wiring
I am sure the connection is fine, because after this error I run the former code and it work perfectly.
Here is the code that has been change to fit Adafruit_CircuitPython_DHT
import datetime
import time
import adafruit_dht
from board import D4
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import sh1106
from PIL import ImageFont
# OLED settings
serial = i2c(port=1, address=0x3C)
device = sh1106(serial)
font = ImageFont.truetype('simyou.ttf', 15)
# DHT11 settings
dht_device = adafruit_dht.DHT11(D4)
def main():
while True:
temperature = dht_device.temperature
humidity = dht_device.humidity
if humidity is not None and temperature is not None:
Temperature = "温度: {0:0.1f}°C".format(temperature)
Humidity = "湿度: {0:0.1f}%".format(humidity)
print(Temperature, Humidity)
for i in range(0, 10):
now = datetime.datetime.now()
today_time = now.strftime("%H:%M:%S")
with canvas(device) as draw:
draw.text((30, 4), today_time, font=font, fill="white")
draw.text((10, 23), Temperature, font=font, fill="white")
draw.text((10, 42), Humidity, font=font, fill="white")
time.sleep(0.2)
else:
print('失败')
if __name__ == "__main__":
try:
main()
except KeyboardInterrupt:
device.cleanup()
passAnd here is the former code
import datetime
import time
import Adafruit_DHT
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import sh1106
from PIL import ImageFont
# OLED settings
serial = i2c(port=1, address=0x3C)
device = sh1106(serial)
font = ImageFont.truetype('simyou.ttf', 15)
# DHT11 settings
sensor = Adafruit_DHT.DHT11
DHT11pin = 4
def main():
while True:
humidity, temperature = Adafruit_DHT.read_retry(sensor, DHT11pin)
if humidity is not None and temperature is not None:
Temperature = "温度: {0:0.1f}°C".format(temperature)
Humidity = "湿度: {0:0.1f}%".format(humidity)
print(Temperature, Humidity)
for i in range(0, 10):
now = datetime.datetime.now()
today_time = now.strftime("%H:%M:%S")
with canvas(device) as draw:
draw.text((30, 4), today_time, font=font, fill="white")
draw.text((10, 23), Temperature, font=font, fill="white")
draw.text((10, 42), Humidity, font=font, fill="white")
time.sleep(0.2)
else:
print('失败')
if __name__ == "__main__":
try:
main()
except KeyboardInterrupt:
device.cleanup()
passI am new to python and Rpi, and thanks for any help!
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