https://www.edx.org/course/iot-sensors-devices-curtinx-iot2x
Explore various IoT devices and sensor types, how they work, and how we connect them. Map out the process for developing your own IoT ideas.
Starts May 15 for 5 weeks. You might find ideas for what to do with all those RPi and Arduino computers.
Free to audit but a verified certificate costs AUD194.