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New Silvia Project - what would you add?
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Discussions > Espresso > Espresso Mods > New Silvia...  
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JGG
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JGG
Joined: 31 Mar 2006
Posts: 1,376
Location: Kentucky, US
Expertise: I like coffee

Espresso: PID Silvia; PID Alexia
Grinder: Mazzer SJ
Roaster: Hottop D w/HTC+TC4C
Posted Fri Jan 6, 2012, 3:35pm
Subject: Re: New Silvia Project - what would you add?
 

You might have a look at an IAC-5 input module.  Several manufacturers offer them.  Not any cheaper than a relay, but no clunks would be involved :-)

Jim
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philipmc
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Joined: 5 Oct 2011
Posts: 32
Location: Singapore
Expertise: I love coffee

Espresso: Silvia
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Posted Thu Jan 12, 2012, 10:29pm
Subject: Re: New Silvia Project - what would you add?
 

Thanks, looks like a good option.

I now have a thermocouple rigged up on a breadboard (via a MAX6675) with a thermister for comparison as well as an LCD display and control via IR remote. I hope to protoboard it, write some display software and transfer to my machine this weekend and get some pictures/video up. Can't wait to see what the temps really are inside my machine.
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patrickff
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Espresso: Silvia v2
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Posted Fri Jan 13, 2012, 1:59pm
Subject: Re: New Silvia Project - what would you add?
 

I personally think that an Arduino is overkill - a small AVR and a custom PCB will probably do the trick.
You might want to base your mod on this one:
Yet another ...
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philipmc
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Location: Singapore
Expertise: I love coffee

Espresso: Silvia
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Posted Sun Jan 15, 2012, 7:10am
Subject: Re: New Silvia Project - what would you add?
 

Thanks Patrick, a really useful link. You're right that the arduino is overspecified for what I'm using it for, but it's cheap and quick to setup, hence a good option for me.

I've installed and tried the prototype (just temperature sensing for now). Here are some pictures. I must say, I know there was a swing to be expected, but when I actually saw it swing between 87C and 116C it really brought it home. I also discovered my temperature surfing was all wrong! I was pulling shots at 112C or thereabouts! DOH! The difference when pulling at 102C is astonishing - much sweeter with no bitterness and a more fully developed flavour. I am gobsmacked.

Link to Flickr set

philipmc: DSC03001.JPG
(Click for larger image)
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patrickff
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Espresso: Silvia v2
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Posted Wed Jan 25, 2012, 2:34pm
Subject: Re: New Silvia Project - what would you add?
 

Nice pictures on flickr ... this already helps with temperature surfing.
Any more progress (or busy with real life)?
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philipmc
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Joined: 5 Oct 2011
Posts: 32
Location: Singapore
Expertise: I love coffee

Espresso: Silvia
Grinder: Rocky
Posted Sat Jan 28, 2012, 6:11am
Subject: Re: New Silvia Project - what would you add?
 

I'm actually now working on a TC4 variant. The MAX6675 appears to be very sensitive to the power source. With USB power via PC it experiences some strange issues with dropping a degree or so whenever the shielding on the thermocouple is touched. With USB power via a kindle power supply (240v AC) it experiences a wobble of half a degree or so.

I have the TC4 and have soldered on the headers and screw terminals. Just waiting for a second thermocouple (for the grouphead) to arrive before I update the design completely. I've got a 1.8" TFT (full colour display) up and running also. So the next version will be quite different!

I've been reading up on PID control and it's starting to make more sense. I think I need to actually see it in practice to get a better practical feel for the variables and how they impact the behaviour.

As they say, watch this space... =)
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philipmc
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Joined: 5 Oct 2011
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Location: Singapore
Expertise: I love coffee

Espresso: Silvia
Grinder: Rocky
Posted Wed Feb 1, 2012, 9:35am
Subject: Re: New Silvia Project - what would you add?
 

A sneak preview of my mk2...

Done:
- TFT setup (SPI and software)
- protoboard design and soldering
- read ambient from T4C
- tested IR receiver and wrote harness for Apple remote

Next phase
- connect and test thermocouples (still in the post!)
- write data logging to uSD card
- case it up
- install in Miss Silvia
- take nice photos

After that
- add SSR and PID control
- graphing on the screen?

philipmc: DSC03036-001.JPG
(Click for larger image)
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patrickff
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Joined: 15 Aug 2011
Posts: 36
Location: DC
Expertise: Just starting

Espresso: Silvia v2
Grinder: Baratza Vario
Drip: Aeropress
Posted Wed Feb 1, 2012, 4:46pm
Subject: Re: New Silvia Project - what would you add?
 

TFT setup (SPI and software)

Standard PIDs already blush with shame.

tested IR receiver and wrote harness for Apple remote

No physical buttons? The last thing you want to do is searching for the remote.

write data logging to uSD card

An alternative would be an USB port.

graphing on the screen?

http://en.wikipedia.org/wiki/Sparkline

Very nice so far.
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philipmc
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Joined: 5 Oct 2011
Posts: 32
Location: Singapore
Expertise: I love coffee

Espresso: Silvia
Grinder: Rocky
Posted Fri Feb 10, 2012, 9:38am
Subject: Re: New Silvia Project - what would you add?
 

The graphing is almost complete. I ran into some snags with available memory (lack of!), so had to do a bit of optimisation. I may shortcut it for now and have a fixed temperature scale. Am I right in thinking that the grouphead should have a target temperature of around 95C? I guess I'll start with something like a 80-105C range.

I've thought long and hard about buttons. I'm trying for a very clean and minimal installation, hence dropping all physical interfacing. I was thinking of mounting the screen behind a cutout in the panel behind the grouphead/steam wand. I have to admit though, this is the part of the design I am least happy with. At the moment I am only considering that panel or the top one, as both are easy to access with a few screws and flat for easy modification.

For data logging, the screen comes with a uSD card adapter. Seems a shame not to use it!I am planning to keep the USB for power and upgrading the software. It will probably exit under the machine towards the rear.
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patrickff
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Joined: 15 Aug 2011
Posts: 36
Location: DC
Expertise: Just starting

Espresso: Silvia v2
Grinder: Baratza Vario
Drip: Aeropress
Posted Fri Feb 10, 2012, 3:33pm
Subject: Re: New Silvia Project - what would you add?
 

philipmc Said:

I'm trying for a very clean and minimal installation, hence dropping all physical interfacing.

Posted February 10, 2012 link

What about a touchscreen :-)?
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