[one_each]

The PSOC 4 is an interesting device. It has an ARM processor, programmable digital logic and programmable analog. You can use it for both input and output as it is a very versatile chip.

As an example, think of all of the arduino's being used to control LEDs. Instead of writing code to meet the strict timing requirements of the LED strings, you could use a PSOC and build a hardware interface that handles the timing leaving the CPU free to do other things.

These are some fun chips to play with, but they do have a higher learning curve then the other boards.