@Crusty: As I generally use Bascom to programme AVR I can run soft I2C or SPI on nearly any pin.
The thing is that a lot of Arduino users are absolute beginners -- they just want to plug the shields in and have them work -- it comes as a big shock to some of them when they upgrade to a Mega and find that 1/2 of their shields no longer work.
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. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.