Max - I did use Eagle. I currently use the free version. It's limited to two layers and approximately 3" x 4" in board space. It's also limited to non-commercial use. It's a great low-cost way to start designing PCBs. If I ever start to sell any of my creations, I'll need to upgrade to a commercial licence.
Hi Duane -- what you didn't mention was that we first started bouncing the idea of this sensor board around one Friday afternoon -- when I talked to you the next day (Saturday afternoon) you'd already designed the board and sent a panel off to be fabricated -- you completely blew me away with this. Did you say you use Eagle PCB for these projects?
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.