Controller for four mains circuits using relays with provision for expansion by I2C, in particular remote temperature measurement for thermostat type functions. (Also see my port expander project)
Raspberry Pi running a Python Gui to control remote Arduino and similar controllers in the style of IOT. The touch screen has a Perspex surround which contains a proximity switch enabling the Pi to break out of a digital picture frame routine using an Adafruit Trinket to issue a keyboard esc character.
Power supply for the Pi with touch screen using recycled batteries from a broken laptop and a Sparkfun smart charging module. The unit works well with a BitScope oscilloscope module to make a reasonably priced test instrument.
As in the project above (camera with pan and tilt) this project uses a Raspberry Pi and an Adafruit Feather in tandem to do the monitoring and control. Essentially the Feather does the basic monitoring and control and the Rpi monitors and controls the Feather. The whole system can be remotely controlled by VNC and UDP over WiFi.