newbie issue with Adafruit_Python_DHT

Allan McCombs

I am trying to read from a DHT22 using Python and the easiest example that I can find. I would think reading from a gpio pin should only be 4 lines of code, but I cannot find that.

What I have done is get Python 2.7
I downloaded Adafruit_Python_DHT from
[https://github.com/adafruit/Adafruit_Python_DHT]

However, I get stuck at their command

sudo apt-get install build-essential python-dev

root@Omega-EFEB:/# sudo opkg install build-essential python-dev
Unknown package 'build-essential'.
Unknown package 'python-dev'.
Collected errors:

opkg_install_cmd: Cannot install package build-essential.
opkg_install_cmd: Cannot install package python-dev.

What do I need to do to get this to work?
Thanks.

Leif Bloomquist

@Allan-McCombs Make sure you do a opkg update first, does that help?

Douglas Kryder

you might need to uncomment some repo sites in the repo list in order to have the update process visit some repo sites that are by default commented out.

Allan McCombs

Thanks Leif, I did do the update, it always downloads the same 4 files.

Thanks Douglas but I am still a newbie so I don't know where that file lives.

Leif Bloomquist

I got python installed OK on my Omega 2+ following these instructions:

https://docs.onion.io/omega2-docs/installing-and-using-python.html

György Farkas

@Allan-McCombs

Adafruit_Python_DHT

Python library to read the DHT series of humidity and temperature sensors on a Raspberry Pi or Beaglebone Black.

For all platforms (Raspberry Pi and Beaglebone Black) make sure your system is able to compile Python extensions.
On Raspbian or Beaglebone Black's Debian/Ubuntu image you can ensure your system is ready by executing

sudo apt-get update
sudo apt-get install build-essential python-dev

/README.md/

So build-essential and python-dev are Debian packages...

About how to (not use DHT sensors on Omega please read this post.
I think this Omega Weather Station could be the perfect project for you instead of that Adafruit one.