DHT11 and DHT22 temperature humidity sensor code

Stephen Tunney

Put that source code up on GitHub. Looks like derivative work from the AdaFruit site, which is good (+1 for code reuse).

Link to GH site please!

Stephen Tunney

Also, am able to run on 0.0.5 b244 and successfully getting data.

It should be noted that I could not get data connecting to the 3.3V, instead I had to use the 5v connector for my DHT22 device.

root@Omega-107F:~# ./checkHumidity 0 DHT22
39.900002
21.299999
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.900002
20.700001
root@Omega-107F:~# ./checkHumidity 0 DHT22
35.000000
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
35.000000
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.700001
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.500000
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.400002
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.400002
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.400002
20.600000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.200001
20.500000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.400002
20.500000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.500000
20.500000
root@Omega-107F:~# ./checkHumidity 0 DHT22
34.400002
20.500000

--Took a deep breath on the sensor here

root@Omega-107F:~# ./checkHumidity 0 DHT22
47.200001
20.700001
root@Omega-107F:~# ./checkHumidity 0 DHT22
47.299999
20.600000

--Took a deep breath on the sensor here

root@Omega-107F:~# ./checkHumidity 0 DHT22
63.000000
21.000000
root@Omega-107F:~# ./checkHumidity 0 DHT22
62.000000
20.799999
root@Omega-107F:~# ./checkHumidity 0 DHT22
58.900002
20.700001
root@Omega-107F:~#

Daniel Sitnik

Cool!

I'm a complete newcomer to the hardware/circuit/IoT stuff and for my first hardware project I was thinking about doing something with the Omega and a DHTXX.

I've seen some examples of the DHTXX with Arduino and Raspberry, but I'm a little clueless about how to do it with the Omega since the output voltages seem to be different (only 2.8 for the Omega).

Can you please share a picture or diagram of your setup?!

esunayg

It works!

On pin 1 and +3.3V

Screenshot:

Daniel Sitnik

Mine works too!!

Thomas Krampe

I'm a C dummy, how can I use it on my onion. Is there something in Python available.

Thomas

riccardoch

@Thomas-Krampe Here an example in python:

# -*- coding: utf-8 -*-
import subprocess

pinNumber = 8
sensorModel = 'DHT11'

proc = subprocess.Popen(['./checkHumidity ' + str(pinNumber) + ' ' + sensorModel], stdout=subprocess.PIPE, shell=True)
(out, err) = proc.communicate()

sensor_data = out.split('\n')
humidity = sensor_data[0]
temperature = sensor_data[1]

print "Humidity:"
print str(humidity) + "%"

print "Temperature:"
print str(temperature) + "°C"

Michael Ketslah

@Riccardo-Chiarini this is the script that actually uses the same application. i don't think he was looking for that kind of an example

József Schuck

Hello!
I'm a real newbie and can't solve a problem. after the line checkHumidity/bin# ./checkHumidity 11 DHT11 it says: syntax error: unexpected "(" (expecting ")")
What does that mean? I'm really hopeless..

WereCatf

@József-Schuck You're using the Omega1 binaries. They don't work on the Omega 2.

Felipe Cespedes

@WereCatf Where the binaries for omega2 can be found? Thanks.

h0l0gram

Hi all
Good news. I migrated original code successfully to work on Omega2!
See https://github.com/h0l0gram/omega2-checkHumidity for binary and source.

Make sure your Omega2 has firmware >=0.1.10 b160 or it won't work.

root@Omega-1234:~# oupgrade -c
> Device Firmware Version: 0.1.10 b160
> Checking latest version online...
> Repo Firmware Version: 0.1.10 b160
> Comparing version numbers
> Device firmware is up to date!
root@Omega-1234:~#

See https://docs.onion.io/omega2-docs/updating-the-omega.html

Example

root@Omega-1234:~/checkHumidity# ./checkHumidity 19 DHT22
48.299999
28.299999