Steve_M
TVWBB Guru
Using a spare HM v4.2 board I have and a solid state relay, I'm looking to re-purpose this as a PID controller for my espresso machine.
Leaving the HM set at a single point 100% of the time is no problem. This covers 95% of the use case for pulling espresso shots. The other 5% is where I would want to ramp up the temps ( steam wand ) and then set the temps back to the espresso shots temps.
Are there any creative ideas how this can be done? Ideally I'd like to run it with just the HM board, not even with the RasPi attached, but maybe I need the pi to be able to somehow script the 2 set point changes.
Ideas so far:
- Have a dummy meat temp probe that can trigger a SP change based on being too high or too low
- Use pre-programmed USB button that can issue lmclient commands to change the set point
Leaving the HM set at a single point 100% of the time is no problem. This covers 95% of the use case for pulling espresso shots. The other 5% is where I would want to ramp up the temps ( steam wand ) and then set the temps back to the espresso shots temps.
Are there any creative ideas how this can be done? Ideally I'd like to run it with just the HM board, not even with the RasPi attached, but maybe I need the pi to be able to somehow script the 2 set point changes.
Ideas so far:
- Have a dummy meat temp probe that can trigger a SP change based on being too high or too low
- Use pre-programmed USB button that can issue lmclient commands to change the set point