Can't Read Two Sensor

[aliumairs]

Hello,

this library didn't work if me using two sensor dht22 on my raspberry pi3 (raspbian, python2). My program only read one sensor. how to resolve it, thanks before.

code:

import Adafruit_DHT

while 1:

sensor = Adafruit_DHT.DHT22
pin = 13
pin2 = 26
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
humidity2, temperature2 = Adafruit_DHT.read_retry(sensor, pin2)

if humidity != None and temperature != None :
	print('Temp={0:0.1f}*C  Humidity={1:0.1f}%'.format(temperature, humidity))
if  humidity2 != None and temperature2 != None :
		print('Temp2={0:0.1f}*C  Humidity2={1:0.1f}%'.format(temperature2, humidity2))
else:
		print('Failed to get reading. Try again!')

[flyadive]

So, Harlilopez, did it work?

sensor = Adafruit_DHT.DHT22
pin = 13
pin2 = 26
humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
humidity2, temperature2 = Adafruit_DHT.read_retry(sensor, pin2)

if humidity != None and temperature != None :
print('Temp={0:0.1f}*C Humidity={1:0.1f}%'.format(temperature, humidity))
if humidity2 != None and temperature2 != None :
print('Temp2={0:0.1f}*C Humidity2={1:0.1f}%'.format(temperature2, humidity2))
else:
print('Failed to get reading. Try again!')

Barry
FLYADIVE@GMAIL.COM

[aliumairs]

filyadive,

problem was solved, but my raspberry pi can't read data if sensor cable length out of 5 meter.... now i'm use arduino to read sensor dht and communicate it to raspberry pi via data serial...

[flyadive]

Thank you for the response and update. My testing will be with leads no longer than 1 meter. Do you think the problem may be a voltage drop issue? I’m thinkingm: 1 go to a larger diameter wire. 2 use shielded wire. 3 use the 5 VDC pins instead of the 3 VDC pins. Ian totally new to the RPi and programming, I’m just considering some basic electrical engineering. YES, I am on a huge upward learning curve. Thank you again, Barry

…

On Wednesday, December 13, 2017, harlilopez ***@***.***> wrote: filyadive, problem was solved, but my raspberry pi can't read data if sensor cable length out of 5 meter.... now i'm use arduino to read sensor dht and communicate it to raspberry pi via data serial... — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#73 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/Ag4RxQxgtWzrHDKQpe5r_4ZBZcQy7rSOks5tAI-wgaJpZM4QUZeg> .

-- Barry "Chop'd Liver" If you wash your hands before you go to the bathroom you may have the makings of a Crew Chief.

[rcassel52]

I've used DHT22 with 50ft of CAT 5 cable on an Arduino Yun without any issues. The Yun has 5V pins

[brennen]

Original issue seems to be resolved.