This last week I finally made time to work on something that's been in the back of my head for months. Code-name "Hephaestus" it is a handheld, battery operated, arduino based tester for Renard controllers. You can read all about it on my Christmas website at: http://christmasonquiethills.com/how...ks/hephaestus/
In a nutshell, it has an LCD and navigation buttons to configure the output which is converted to RS485 for Renard controllers.
If you read the page, you'll see it is not complete and I have a goal of making the final hardware block as cheap as possible. I would like to get help from the community in designing the breakout board that I currently have breadboarded. I'd like to use this to learn how to do board layouts in Eagle, so I may have questions about that as well as how to keep costs down.