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"BlueJava": Silvia + Arduino mod
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Discussions > Espresso > Espresso Mods > "BlueJava":...  
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jonr
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Joined: 25 Jun 2013
Posts: 290
Location: Americas
Expertise: I like coffee
Posted Fri Apr 4, 2014, 9:20am
Subject: Re: "BlueJava": Silvia + Arduino mod
 

Note that the typical SSR doesn't turn off when you tell it to, it turns off at the next zero crossing after that.  So yes, for good/fast control with a SSR you need to sync your turn on times with a zero crossing.  Or use something like a Crydom D4D07 (expensive) or an IGBT.
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rsinger
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rsinger
Joined: 25 Jan 2008
Posts: 187
Location: Boca Raton, Florida
Expertise: I like coffee

Espresso: Bezzera Strega
Grinder: OE Pharos - #136!!  ;)
Posted Mon Apr 7, 2014, 8:53am
Subject: Re: "BlueJava": Silvia + Arduino mod
 

Hi Henrik:

You're right the PTO 22 PB4 mounting board is expensive, but I found one really that was really cheap on eBay... keep an eye out for them.

Check this one for example

Best,

Rick

 
New Bezzera Strega
OE Pharos: #136!!
Silvia's a virgin.....  again! (and sold)
Brasilia Cappuccino Del-1 Hx (sold too)
http://www.flickr.com/photos/66189160@N04/sets/72157628015297112/show/
http://espressoproject.blogspot.com/2008_10_01_archive.html
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buestad
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Joined: 22 Nov 2013
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Posted Tue Apr 8, 2014, 11:24pm
Subject: Re: "BlueJava": Silvia + Arduino mod
 

A small update on the UI of the BlueJava android app

buestad: 2014-04-08_14-31-27.jpg
(Click for larger image)
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buestad
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Joined: 22 Nov 2013
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Location: Norway
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Espresso: Rancilio Silva
Grinder: Rancilio Rocky
Posted Tue Apr 8, 2014, 11:24pm
Subject: Re: "BlueJava": Silvia + Arduino mod
 

... and the trends ...

buestad: 2014-04-08_14-31-03.jpg
(Click for larger image)
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billc
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Joined: 15 Jan 2009
Posts: 126
Location: Seattle, Washington
Expertise: Professional

Espresso: CC1 - GS - GS3 - GB5
Grinder: Baratza - Mazzer-Marzocco
Drip: My own Creation
Posted Wed Apr 23, 2014, 7:47am
Subject: Re: "BlueJava": Silvia + Arduino mod
 

Buestad,
I love these projects!!!!!
I have some power boards from a super automatic espresso machine that are pretty useful.  They are a bit big but they offer the following:

High power Triac (up to 1400 watts)
2 Random fire Triacs (to vary power to the vibe pump for presssure profiling)
Power supply (8 and 24 volts out)
Zero crossing detector (output is 5V pulse directly to arduino)

I am happy to send you a couple of these if you want to use or try them.  Just PM me.  (JonR, let me know if you want some also).

Just a quick note on SSR's.  There are 2 types for this application, zero cross SSR, and Random fire SSR.  The zero cross SSR is the one you normally find.  These only turn on and off at the zero cross of the AC cycle. These are good for heating elements.  The random fire SSR can be turned on any where int he AC cycle, it still turns off only at the zero crossing.


BillC
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ddubick
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Joined: 1 May 2012
Posts: 142
Location: Calgary, Alberta, Canada
Expertise: I live coffee

Espresso: Nuova Simonelli Appia 1Gr
Grinder: OE Pharos, Macap M5, Nuova...
Roaster: Behmor 1600
Posted Wed Apr 30, 2014, 12:23pm
Subject: Re: "BlueJava": Silvia + Arduino mod
 

I would love to see some of your code on both the arduino and the android side.

I tried briefly to program an android app for similar purposes but put it aside for the winter (too much skiing).
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marosmith
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marosmith
Joined: 15 Dec 2013
Posts: 85
Location: Lafayette, Oregon
Expertise: I love coffee

Espresso: NS Oscar, Silvia V2
Grinder: NS MCF, Baratza Encore
Posted Thu May 1, 2014, 7:00pm
Subject: Re: "BlueJava": Silvia + Arduino mod
 

Man this is awesome
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ddubick
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Joined: 1 May 2012
Posts: 142
Location: Calgary, Alberta, Canada
Expertise: I live coffee

Espresso: Nuova Simonelli Appia 1Gr
Grinder: OE Pharos, Macap M5, Nuova...
Roaster: Behmor 1600
Posted Fri May 2, 2014, 8:24am
Subject: Re: "BlueJava": Silvia + Arduino mod
 

Also, could I get a link to the pressure transducer you're using?  I bought one from China and it doesn't seem to be working right.

Edit: Think I found it.  Ebay from china too.  Ordered one anyway. :D
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jonr
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Joined: 25 Jun 2013
Posts: 290
Location: Americas
Expertise: I like coffee
Posted Fri May 2, 2014, 2:57pm
Subject: Re: "BlueJava": Silvia + Arduino mod
 

If anyone wants help with using an IGBT for smoother pump control, let me know.  It can turn on and off at any time and is fast (many KHz) enough to do PWM to approximate a reduced voltage sine wave.
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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 Sat May 3, 2014, 9:11am
Subject: Re: "BlueJava": Silvia + Arduino mod
 

I am interested to know more about high frequency PWM for AC pump control.  I have hesitated to try this, probably out of ignorance, over concerns about the noise I would be creating on my AC mains.  Have you found this to be an issue?

Jim
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