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@altr I'm not sure about OpenWrt 21, but check out this wiki about how to control the LED via a trigger.
http://onioniot.github.io/wiki/Tutorials/Blinking-Morse-Code-on-LED.html
I know it works as it is one of the earlier things I tried when learning about the Omega2.
@zached Omega Dash uses a frame buffer approach and LVGL (lvgl.io) for the UI.
https://community.onion.io/topic/3824/omega2-dash-work-in-progress/2
@BeekyB My first suggestion is to ensure you have your Omega2 powered up.
Or you could provide more details of what problem you are experiencing so perhaps members of the community may have some ideas of how to solve whatever issue you are experiencing.
@Dave-M The hardware design guide is very helpful in designing these circuits.
https://github.com/OnionIoT/Omega2/blob/master/Documents/Omega2S Hardware Design Guide.pdf
@phzdw Onion published the code to their python gpio module. Open source providers like Onion release their code so developers can collaborate on improvements and updates. This model allows companies such as Onion to push forward on new products rather than be tied down maintaining older code. This is the basic principle of the commercial open source model.
@SpiderKenny did you run scripts/feeds clean?
Otherwise try this:
git checkout openwrt-18.06
scripts/feeds clean
scripts/feeds update -a
@BeekyB Looks like it can't find your JRE. You need to check your classpath.
From the documentation of jamvm:
JamVM must be used in conjunction with a Java class-library to make a full Java Runtime Environment. Compatible class-libraries are GNU Classpath or the class-library from OpenJDK.
http://jamvm.sourceforge.net/
https://www.gnu.org/software/classpath/
@MarshalllGG Yes you can compile on say Linux but you have to run the app on your Omega2. Sometimes if I am developing an app I might do the skeleton of the work on my Linux system and test it on Linux without all the Omega2 specific stuff. Once I have that all correct I then start adding the Omega2 specific stuff and then need to test it on the Omega2.
@omondtong I'm not an engineer so I can't advise you but you can take a look at the docs on how to power an Omega2 using a breadboard here:
http://docs.onion.io/omega2-docs/hardware-prep-no-dock.html
I'm not sure what you mean about the "expansion socket" because that suggests you have a dock, which would then be the logical way to power the device.