Hello Roy,
I am glad you managed to easily integrate the widget in your setup!
If you want to show the status of the relay you don’t need angularJS. It can be achieved with plain old HTML. You should edit the “ohscheduler.tpl.html” template and place your item there. You can inspire from the topics created by Yannick, like HABPanel Development & Advanced Features: Start Here! or Custom widgets: feature walkthrough.