Hi all,
it's been a while since I've been here. I've been plodding along fairly happy with my FZRR drum roaster; Gino Rossi grinder & ECM Giotto (2007) until the Giotto stopped heating a couple of weeks ago
After some diagnosis I found that the water sensors, pressure sensor, element and pump are all ok, but the relay on the controller is 0xDEAD!
I see some drop-in replacement controllers around $300 (I didn't think they made this one anymore so they must be an aftermarket compatible thing) but what I really want to do is replace it with my own design for a bit of fun and learning.
I'm comfortable with the programming & purchasing side of things, but at this stage I'm not 100% sure how to use the existing water sensors. Has anyone tried this themselves? I may have to do some measurements.
I'm not going to do any PID controlled solid-state relays or anything flash - maybe later. I'm just going to start with a like-for-like replacement. An Arduino with some extra bits n pieces would be sufficient. As far as I can tell, this is what it comes down to:
Inputs:
Outputs:
There's also a bit of corrosion around some of the copper fittings, so I may end up taking the boiler out but we'll see.
Well, what do you think? Anyone done this before who would care to comment?
In the meantime, enjoy your nice coffee, cause I'm drinking from a moka pot!
it's been a while since I've been here. I've been plodding along fairly happy with my FZRR drum roaster; Gino Rossi grinder & ECM Giotto (2007) until the Giotto stopped heating a couple of weeks ago

After some diagnosis I found that the water sensors, pressure sensor, element and pump are all ok, but the relay on the controller is 0xDEAD!
I see some drop-in replacement controllers around $300 (I didn't think they made this one anymore so they must be an aftermarket compatible thing) but what I really want to do is replace it with my own design for a bit of fun and learning.
I'm comfortable with the programming & purchasing side of things, but at this stage I'm not 100% sure how to use the existing water sensors. Has anyone tried this themselves? I may have to do some measurements.
I'm not going to do any PID controlled solid-state relays or anything flash - maybe later. I'm just going to start with a like-for-like replacement. An Arduino with some extra bits n pieces would be sufficient. As far as I can tell, this is what it comes down to:
Inputs:
- tank water sensor (need to put some voltage on a wire and detect an open circuit to ground to see if there is water)
- boiler water sensor (same as above)
- boiler pressure switch (just uses a microswitch)
- lever switch
Outputs:
- Pump (looks like a 240V relay but not sure)
- Element (240V relay)
- maybe some sort of water valve to direct pump water to the boiler vs group - not sure yet
There's also a bit of corrosion around some of the copper fittings, so I may end up taking the boiler out but we'll see.
Well, what do you think? Anyone done this before who would care to comment?
In the meantime, enjoy your nice coffee, cause I'm drinking from a moka pot!


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