Our original plan for the Pulsar was a 2-part board, one carrying the LEDs and another carrying the RFduino and all other electronic components. This would allow us to have more control over the size of each (e.g., we could have a huge ring of LEDs controlled by the same tiny-sized controller board).

Photo credit: MakerBro; prepared for ISS Above HD+ Kickstarter campaign.

After a few use cases, and feedback from potential users we discovered that the one-size fits most approach wasn't out of the question. After considering assembly costs it as a clear choice for us that we wanted one board to rule them all...