These are some features that are planned in the short term (or are already implemented) in the PID controller:

• Auto-tuning.
• Serial interface (RS-232) so information can be sent to a PC, like temperatur plots etc.
• A desktop (PC) application so the operator can modify the settings of the controller (through RS-232).
• The possibility to select different characteristics of the controller, i.e. conservative, moderate or aggressive response to temperature change.

And here are some ideas for future development (thanks a lot for all your valuable comments on the coffeegeek forum and the home-barista.com forum):

• Detect the water flow so the heater could be activated before the temperature falls ("feed forward").
• Numeric display(s).
• Dual setpoints (brew/steam)
• Dual channels for double boiler machines.
• Various timer functions.
• Water level detection/control.