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Next Mod: PID my Gaggia Classic
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daduck748
Senior Member


Joined: 13 Dec 2012
Posts: 157
Location: California, USA
Expertise: Just starting

Espresso: Gaggia Classic (2012)
Grinder: Breville BMF600XL
Posted Thu Oct 31, 2013, 8:47pm
Subject: Re: Next Mod: PID my Gaggia Classic
 

Regarding the RTD: that's cool that you have one that you can actually measure.  Mine was the M4 "for Gaggia and Rancilio" RTD from Auber, and I never got it working with any equipment. That only means that it's a direct replacement for the OEM tstats, doesn't mean you can plug it into a Gaggia or Rancilio.   Or, perhaps mine is just broken and it just measures as a wire.  Either way,  I think it's too late to return mine now.

Question about the RTD, it measures 1400 ohms at room temp or at operating temp?  Once you find the operating-temp resistance, then you have to range it, otherwise, let's say you calibrate it to read up to 250F, with a 10-bit ADC (1024 steps), your accuracy is ~0.24F.  If you can offset your voltage to read, say, 150-250F, then with a 10-bit ADC, your accuracy will increase to ~0.09F.  What you'll lose is the ability to read any temps lower than 150F, and anything above 250F will read as 250F.  Below 150F, it doesn't really matter.  You're just blind.  But reading above 250F would be useful to gauge how much steam pressure you have in the boiler.




The display is a good find.  I was narrowing my search to 3.5" graphic displays and I guess this one got filtered out.  I did find some 2.2" displays with SPI but that is WAY too small to be useful, unless it's a phone.

 
Gaggia Classic
Breville BMF600XL
Ducati Hypersport 748r
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Oct 31, 2013, 9:13pm
Subject: Re: Next Mod: PID my Gaggia Classic
 

You and Jonr have company in Gaggia Tech land with some common interests.

http://www.cyberelectronics.org/?p=458

 
D4F also at
http://www.gaggiausersgroup.com/
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daduck748
Senior Member


Joined: 13 Dec 2012
Posts: 157
Location: California, USA
Expertise: Just starting

Espresso: Gaggia Classic (2012)
Grinder: Breville BMF600XL
Posted Thu Oct 31, 2013, 9:38pm
Subject: Re: Next Mod: PID my Gaggia Classic
 

Wow... that's the CoffeePorn of all CoffeePorn...

Nice find.  It started looking similar to my 20x4 display.  With this, I would have had a head-start with the PIDuino.

 
Gaggia Classic
Breville BMF600XL
Ducati Hypersport 748r
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Oct 31, 2013, 9:53pm
Subject: Re: Next Mod: PID my Gaggia Classic
 

He is here also if you want to catch up

http://www.gaggiausersgroup.com/index.php?action=forum

 
D4F also at
http://www.gaggiausersgroup.com/
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jonr
Senior Member


Joined: 25 Jun 2013
Posts: 298
Location: Americas
Expertise: I like coffee
Posted Fri Nov 1, 2013, 7:45am
Subject: Re: Next Mod: PID my Gaggia Classic
 

I agree about 10 bit A/D converters.  I prefer to use 16 or at least 12 bits.

D4F - nice find on the well documented modifications.  I may have missed it, but I think it needs three things.  Voltage control of the pump (vs on/off cycle skipping which causes fluctuations), flexible temperature profiling (I see a falling then rising temp profile which isn't what I would want) and flexible flow profiling.

I'm tempted to skip buttons and a display completely and just use my Android phone for the user interface.  This Android
application
should work to get started.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,015
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri Nov 1, 2013, 9:26am
Subject: Re: Next Mod: PID my Gaggia Classic
 

jonr Said:

D4F - nice find on the well documented modifications.  I may have missed it, but I think it needs three things.  Voltage control of the pump (vs on/off cycle skipping which causes fluctuations), flexible temperature profiling (I see a falling then rising temp profile which isn't what I would want) and flexible flow profiling.

I'm tempted to skip buttons and a display completely and just use my Android phone for the user interface.

Posted November 1, 2013 link

I hope that you discuss with Cyber at his site or GUG.  It is beyond my pay grade :)

 
D4F also at
http://www.gaggiausersgroup.com/
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