Posts mit dem Label Coffee werden angezeigt. Alle Posts anzeigen
Posts mit dem Label Coffee werden angezeigt. Alle Posts anzeigen

2018-01-28

Coffee with bottled water

Project history

  1. old posting: 'roast only' on the Bonaverde - Aldo Parducci
  2. current posting
  3. next posting: 'roast only' on the Bonaverde - Familia Alfaro


Before

Up to now I have used tap water with a filter for my coffee experiments.
According to the water plant the water should be very hard but be only slightly above Ph neutral.
I always had the issue of always having an acidic taste.
Some coffee cups had a very balanced acidic taste, some where so strong as to be undinkable.
Especially freshly roasted coffe that was not given any time to release trapped CO2.

After

Now I experimented with using cheap bottled water insted.
DAMN, WHAT A DIFFECENCE.
Absolutely no sour taste anymore. Roasted the day before and even freshly roasted (with all the CO2 still in there and ALYWAYS tasting distinctly sour before) it tasted like a good cup of coffee.

Sadly it contains 500mg Ca/l+64mg Mg/l=>84,86dH and thus will just about kill the machine with scale if used often.

Why?

 Let's have a look...
The bottled water was from REWE "Aqua Mia Still" from the Alwa Spring in Sersheim.

There is a nice comparison of German bottled waters here. It has pH values (the content only lets you calculate hardness)

Chlorine

The water plant says, we have 23.1mg/l.
The bottled water says, we have 29.0mg/l
The 
0mg/l is perfect
effect: in high temperature/pressure this creates hydroloric acid thatg eats away on metal.
There is nothing I can do anything about this except maybe carbon filtration.
But I don't care enough about this minor effect to do that.

 pH 

The water plant says, we have 7.57pH.
The bottled water says: nothing
Water #2 says: nothing

7.0pH is perfect,
6.5-7.5pH is acceptable
effect: abovr 7.5pH this causes excess scale


Next steps: I ordered a digital pH and TPS meters from China for less then 2eur.

Hardness (Calcium only)

The water plant says, we have 75,8mg/l of Calcium
and a total hardness (considering not just the Calcium) of 12.5°dH or 2.19mmol/l
The bottled water says, we have 500mg Ca/l+64mg Mg/l=84,86dH

7°dGH/68mg/l is perfect
17-85mg/l is acceptable (first source).
8-12 °dH is acceptable (second source).
3-7 °dH is acceptable (third source).
effect:
Above 85°C this forms scale.
High hardness makes coffee go bitter quickly.
Low hardness supresses the taste of the coffee.

Here is a nice calculator between °dH, mg/l of Calcium-Oxide and ppm CaCO3,...
Or you calculate °dH = 0.1402*[Ca in mg/l ] + 0.2307*[Mg in mg/l ]
Or mmol/l= [Ca in mg/l] / 40 + [Mg in mg/l] / 24,3 .

Sodium (DE: Natrium)

The water plant says, we have 10.2mg/l.  But ADD what the water filter releases.
The bottled water says, we have 18.0mg/l

10mg/l is perfect.
Anything near that level is acceptable.

The problem may of cause also be that the water filter with my very hard water (12.5°dH or 2.19mmol/l) releases enough sodium (DE: Natrium) to exceed 10mg/l.
The original water already has 10.2mg/l and is thus at the brink of the acceptable level.
Above 50mg/l this seems to cause a sour flavor. (Very low sodium levels seem to cause sweet flavors. That sounds very interesting as it's a taste I generally like.)

TDS=total dissolved solids

The water plant says, we have 75.8mg/l of Calcium + 7.3mg/l Magnesium + 10.2mg/l Natrium+1.7mg/l potassium (DE: Kalium)
= 95mg/l  I'm not sure I did this calculation correctly and am not missing anything.
The bottled water says, we have 500+29.0+64.0+18.0+5.0=616mg/l

150mg/l is perfect
75-250mg/l is acceptable.
effect:
low=overextraction, tannic taste (DE: Gerbsäure), dry mouth
high=mineral taste, overextraction

Total alkalinity

The water plant says, we have TODO
The bottled water says: 1130mg/l of Sulfate + 414.0mg/l of Bicarbionate (DE: Hydrogencarbonat)
TODO: I need to refresh my chemistry on this topic.

40mg/l is perfect.
Anything near that level is acceptable.
effect: high=gum up outher layer of coffee and cause uneven extraction. Also scale buildup.

Links

2018-01-04

'roast only' on the Bonaverde - Aldo Parducci

Project history

  1. old posting: 'roast only' on the Bonaverde - Rodolfo Ruffatti
  2. current posting
  3. next posting: Coffee with bottled water








This time I tried
Bean Type:  Burbo
Grown by Aldo Parducci
of El Salvador

This is one of the larger bean packs I got from the first coffee delivery  for my Bonaverde Berlin roast+grind+brew coffee machine.

I used "roast only" in the alpha version of the "Coffee Concierge" Facebook Messenger Chat bot last night and ground+brew the coffee this morning.
Change to previous attempts: I used a water filter. (Water here has a PH of 7.57 but an extreme 12.2dH of hardness.)

Update: See Coffee with bottled water for later experiments with water that resulted in much better coffee.

Results

 Again I used my Hario Skerton manual coffee grinder at the finest setting (dust).

 espresso

not yet

filter coffee

Absolutelay GREAT!!!
Very balanced. Not sour at all. I can really taste distinct flavors.


Other changes 

I did add a new label "Coffee" to this blog. So you can see all postings related to it.

Also the "Coffee Concierge" Facebook Messenger Chat-Bot that controls the "Berlin" coffee machine has a new "abort machine" command. It however isn't recognized in all states and does not seem to abort a brewing cycle that has already started.

Links

2017-11-21

'roast only' on the Bonaverde - Rodolfo Ruffatti

Project history

  1. old posting: Trying 'roast only' on the Bonaverde again
  2. current posting
  3. next posting: 'roast only' on the Bonaverde - Aldo Parducci








This time I tried
Bean Type:  Burbon Rojo
Grown by Rodolfo Ruffatti
of El Salvador

This is one of the larger bean packs I got from the first coffee delivery  for my Bonaverde Berlin roast+grind+brew coffee machine.



Results I

I used "roast only" in the alpha version of the "Coffee Concierge" Facebook Messenger Chat bot on Saturday.
Now it is Tuesday.

Update: I did NOT use a water filter yet. See 'roast only' on the Bonaverde - Aldo Parducci for the results when I added one.
Update: See Coffee with bottled water for later experiments with water that resulted in much better coffee.

I did NOT use the roasting profile for these beans because for "roast only" I can still only use a generic default-profile. 


 Again I used my Hario Skerton manual coffee grinder at the finest setting (dust).

 espresso

The espresso had slightly cold water this time. The IR-Thermometer meassured only 65°C but I believe that meassurement was in error as the water came fresh out of the coffee machine.
Again I used a Handpresso.
....the espresso was amazing. Perfectly mild and tasty. Not a hint of sourness or bitterness at all.

filter coffee

The filter coffee using the off-the-shelf Krups coffee machine was good.
Not as perfect as the espresso but a real good cup of coffee.
Absolutely no comparison to the "Almond" beans I tried yesterday.

Results II

This time I used a water filter.
I did NOT use the roasting profile for these beans because for "roast only" I can still only use a generic default-profile.

filter coffee 

I tried 42g of beans that I had roasted and then put in a sealed, dark plastic bag with no air in it (aside from the CO2 that the beans release themself) at slightly below room temperature.
It was...slightly sub-par. Too sour for my taste.

Then I tried 42g of beans roasted the night before and left in the roasting chamber to be ground and brewed the next morning.
It was terrible. Completely sour.

 

Results III

 For comparison I did a roast-grind-brew cycle with no time for releasing CO2 between roasting and grinding.
This time I used a water filter.
I did use the roasting profile for these beans.

filter coffee 

Well.... as long as it's hot it is only a bit sour and leaves a sour after-taste. That taste clouds everything else.
As soon as it started to cool down even a tiny bit it gets real sour.

 

2017-11-11

Trying 'roast only' on the Bonaverde again

History

  1. old posting: First Bonaverse coffee delivered
  2. current posting
  3. next posting:'roast only' on the Bonaverde - Rodolfo Ruffati


I tried the "roast only" option in the alpha version of the Bonaverde "Coffee Concierge" Facebook Messen Chat bot today.

ATTENTION!

The "Coffee Concierge" Facebook Messenger chat bot it still in alpha stage. It does not have any error messages or reminders yet and expects you to do things in  exactly the sequence it expects you to. (Without telling you about details such as pushing the button.)

  1. You need to send the command "roast only" via Facebook Messenger. It will ask you for beans. It does not ask about the type of beans or other details for the roasting yet.
  2. Then open the door and close it again. Even if you have already inserted the green beans.
  3. Then and only then click "ok". It should start roasting after a few seconds.
  4. After roasting it will show a red light. That is perfectly okay because the machine is still hot. The light will go out once it has cooled down to safe levels.
  5. Only then will the machine unlock the door.

Results


Update: I did not use a water filter yet. See 'roast only' on the Bonaverde - Aldo Parducci for the results when I added one.
Update: See Coffee with bottled water for later experiments with water that resulted in much better coffee.

The first time I tried that (then the machine was delivered) it did not yet work.
 
This time it seems to be be doing something.
It asked me to insert beans. I did. 
Then my "Berlin" coffee machine came to life and started roasting.
In case this would not be work out as a "roast only" , I quickly added a coffee filter and water.... Just to be safe.

It did *not* ask me what type of beans I had inserted or to scan the RFID tag of the coffee bean pouch.
My guess is that it is using some kind of default roasting profile.

After roasting it was suddenly glowing red and was indeed not continuing with any grinding or brewing.
I put the beans into a clear plastic bag with nearly no air in there to find out just how much CO2 they will release until Monday and to keep then away from oxygen.
Then I'm planning to manually make a nice espresso and maybe a fresh press. 

Result : "Almond"

filter coffee

After 1 week to release CO2, I made a filter-coffee in the Bonaverde "Berlin".
Half the beans with half the water, so I would have beans left for an Espresso.
It tasted very different from the freshly roasted coffee. This time it was neither bland nor completely sour. It tasted like actual coffee.
It was one of the original "Almond" bean-packs.
I'm not 100% sure if I did taste a hint of almond. It was not the taste I was looking for but it was a good cup that was neither bitter nor sour and actually tasted like coffee.

espresso

3 days later I hand-ground the remainder of these beans using a Hario "Skerton" manual coffee mill into super fine dust. This is my default setting because I like making Mokka with this mill.
From what I reat afterwards (to not cloud my judgement), grinding finer or having it in contact with the water for a longer time makes it less sour and more bitter. Grinding more coarse or with a shorter time the other way around. It also gets sour when not roasting long enough but I can't experiment with that parameter yet.

I made 3 espresso (Handpresso with 70°C and 80°C water) and a filter coffee.
The espresso was sour. Every time.

filter coffee again

The filter coffee was made with a Krups off-the-shelf machine and not the Bonaverde machine.
The filter coffee was strange. The first two espresso-sized cups where sour.
After then the later 2 ones where quite okay.
Later I burn my tongue so I can't dive much deeper here.


First Bonaverde coffee delivered

History

  1. old posting: Bonaverde - The Facebook Coffee Machine
  2. current posting
  3. next posting:Trying "roast only"

I got a delivery of new coffee beans from Bonaverde
(It was announced that until the coffee bean store for the Bonaverde "Berlin" machines exist, people would get a package of green beans to roast-gind-brew for free to test the logistics.)
Sender address was "First Choice GmbH c/o Bonaverde Logistics"

Larger packages 

These packages are MUCH larger then the packages there machine came with. I can also not feel smaller packages inside.
Since the RFID Tags are single-use... how am I supposed to roast these? An entire can of coffee from a small pouch was already way too much. This looks like a single package could keep a small army caffeinated.

I just noticed.... it now says "scan with your messenger app"???.
Not "scan with your Bonaverde "Berlin" coffee machine".
Problem is... I can't try this because both of my phones don't support RFID.

Update(2017-11-14): From an email answer from support: "Answered on Facebook - your phone doesn't need to have an RFID capability because the machine communicates with the bot over 3G" (I will have to try that next weekend)

 Changes in labeling

It's a big improvement to list the Country of origin, bean type and weight of the packagesv now.
(See my earlier blog-posting for to compare!)

However, there is no indication given about the flavor to be expected anymore. Not even the "Blueberry" /"Fresh Nuts" /"Almond" labels the smaller packages had.

Update(2017-11-14): From an email answer from support: " Within the bot, you can now choose the roast profile for the new beans as well as find out more about the flavours."  (I habe yet to figure out how to actually DO the second.)

One other thing I am missing is any "best before" date (German: Mindesthaltbarkeitsdatum)
or at least a date when these have been packaged.

Update(2017-11-14): From an email answer from support: "Compared to roasted beans, green beans don't have an expiry date. They should be roasted within the first year from picking for the best possible flavour, but will still be drinkable and make great cup of coffee even when few years old. (I wouldn't expect them to last that long in anyone's household. :)"

Air filter without RFID-tag?

There is also a new air filter. Problem is... it doesn't seem to contain an RFID tag like the original one. So when the machine asks for a new filter at some point (after 60x of roasting according to the manual) ... I won't be able to scan this before changing the filters.

Update(2017-11-14): From an email answer from support: "The air filter without an RFID is a genuine mistake on our part, but that doesn't mean it's not usable. When your machine asks for an airfilter reset, just let us know within the bot, and we'll reset the air filter remotely. All future air filters will come with RFID."

2017-10-27

Bonaverde - The Facebook Coffee Machine

History

  1. old posting on this topic: none
  2. current posting
  3. next posting: First Bonaverde coffee delivered

Back in 2014 I ordered a Kickstarter Bonaverde roast-grind-brew coffee machine for 299eur.
Now it has arrived.

What I wanted it for

I wanted to be able to roast coffee without requiring a lot of space in the kitchen.

To make (filter) coffee from it with little effort when I want to just have my coffe.

But also to custom roast coffee for manual grinding, spicing and brewing my favorite arabian mocca when I want to put effort into it.
Or do the same to feed my grind-brew Espresso machine with fresh milk for Cappucino.

Roasting on Sunday to brew the next weekend
or roast on Friday night to brew on Sunday morning
would be perfectly acceptable for me.

Packaging?

 It came well packaged and even included a velvet liner for the entire machine. (Looks nice but I'm not sure it is ment to carry that kind of weight.)




What was strange was that on the top and the sides they used easy-to-recycle cardboard. Yet at the bottom the packaging was custom shaped plastic-foam.

Usability? 


I noticed a few usability fails:
  • Power socket is on the underside of the machine. Yet neither quick-start nor manual tells you to look in this unusual place.
  • The water-tank is very narrow. Only slightly wider then a small water-fouced. You have to be careful with the water-pressure when filling it up. 
  • It shuts itself down automatically. It doesn't keep the coffee pot warm. At least there is no obvious way to do that.
  • The IMEI for the Facebook Messenger bot is also on the underside. You have to remove all water, coffee can, ... from the machine and topple this heavy thing over to read it. Tilting it is not enough to read the sticker because it's placed in the center.
  • The water tank leaks heavily when you try to carefully carry the machine to a different place with water alreay in there.
  • The instructions for the air filters are missing the first step "scan the RFID tag of the air filter".
  • There is no indication about what flavor to expect from the different beans (more about this below) or what type of beans they are. Also not always obvious what country they are from.

Water?

Obviously every good coffee starts with good water.
I was very surprised that the water-tank of this expensive machine did not contain any water filter to remove chalk.
I had thought about this as a standard-feature even for much cheaper machines nowadays.

The Facebook Coffee Machine

Before delivery
In the weeks before delivery, it became more and more clear that all user interaction including even the shop for buying new beans was implemented as a Facebook Messenger chatbot.
This came as quite a surprise.

Here are the Android permissions required by Facebook messenger:

Before you receive your machine, the first interaction with it looks like this:
I desperately hope this is going to change....soon.
If I have to interact with my coffee machine via a command line, it better be an SSH terminal.
I can't imagine comparing and buying beans and comparing the details of roasting profiles this way. Let alone making any kind of (PCI DSS compliant) monetary transactions.

During delivery
Shortly after the machine arrived, I cat a personal call. However I was busy and the second time they called I was buying coffee-filters and didn't have my phone with me.

I also got am email "Bonaverde - Dene Maschine ist da!" (Yes, a German company with wrong spelling in their automatic customer emails)
However, despite only containing text, the email contained no text/plaintext and only a very cryptic
"
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
", with Microsoft-specific XML namespaces.
Therefore my cellphone would only display it as a blankscreen for security reasons.
Also.... not UTF8 and not the newer ISO-8859-15 that was introduced in 1999 as a replacement.
Aparently it was witten in Microsoft Office365 Word and sent using Microsoft Exchange (because a ton of internal X-Microsoft-Exchange-Diagnostics and X-Exchange-Antispam* have not been removed uppon sending).


Using the "Coffee Concierge"

Note that this is still in alpha stage.

What I did find at first glance was:
  • It does offer to "roast only" and "brew only"
  • After starting anything the user it not instructed how to abort. Typing "stop" seems to work.
  • It does not check of the machine is connected or powered. It just tells you "Pouch not ready" for "grind only" when the machine is unplugged and has never connected to GSM at all yet.
  • If idle, it does seem to spam you with trivia about coffe and FAQ entries. There is no obvious way to stop this. So make sure to disable audio notifications!
  • The store to buy beans does not yet exist.
  • After "make coffee" is finally gives you some information about what flavor to expect...however for one, randomly selected bean only. Yet no infocmation how to abort, get info about other beans or actually have it make coffee.
  • The answer to "what is blueberry" (one of the 3 bean package types) is "Sure. Let's get the roasting going."  ????  
    • Update (2017-11-14): I got an email from support "Within the bot, you can now choose the roast profile for the new beans as well as find out more about the flavours." Uppon clicking through the menu of the Chat Bot I can not find any hint as to how to do the second. I'll certainly try the first next weekend.
Some days later:

"Buy coffee beans"
  •  "opens a web browser with the Bonaverde homepage" - does not work yet

"Schedule coffee"
  • "in development" - does not work yet
"Make Coffee"
  • offers only a single type of coffee
  • does not have "scan coffee pouch" in it's instructions
  • Always aborts with "the roaster door is open, please close it" even though it is it 
  • => does not work yet
"Coffee School" 
  • Seems to be a question and answer game of coffee trivia
  • No obvious way to abort.
  • Asks "wich composer wrote an OPERA about coffee" and answers with the "Cofffee Cantata". Obviously a Cantata is a very much smaller piece of musical work then an entire opera. (At most equivalent to a single opera scene.)
  • The question "Did you known that at one point in history coffee was 'illegal'?" Only allows for a single answer.
  • At one point it goes from small-bandwidth text to a video but luckily doesn't start to play without user consent. However there is no obvious full screen mode. So it's a tiny video on an already tiny screen.
  • It seems  you can't have all lessons the same day.

Offline use?

 The FAQ contains two staements:
and

And it doesn't contain...

So, if the RFID chips only contains the serial number and the roasing profiles are "in the cloud" = on someone else's computer, how can it be used offline with the RFID tag?

Naturally the first test I did was to unpack it in a location without any cellular network reception and try to make coffee.

YES, IT WORKS OFFLINE. ...and I have the 4K video to proof it.

 Only full cans of coffee (being worked on)

In the Kickstarter Campaign, the machine was advertised with "capacity: 2-12 cups".
Naturally I though that ment you could brew as little as 2 cups of coffee.

No, it can only make full cans. According to the FAQ, Bonaverse is working on supporting half cans but not less. 

Roast only/venting (being worked on)

Without Facebook, you can only roast, grind and brew without interruption.
There are no special RFID tags to allow roasting or grinding or to make "regular" coffee from beans or ground beans.
So the only choice without Facebook for now is to pull the power plug.

Only after I connected to the "coffee concierge" and it did offer me to "grind only", "roast only" and "brew only".
Luckily this is being worked on because for filter-coffee the beans should stay 1-2 days to release stored CO2. For espresso about a week (or so the Internet tells me).

It can not make hot water for tea as an alternativ.



Testing it...
For "roast only" it would tell me to insert coffee. I did.
Then it tells me that is will start soon...... even after a long time it doesn't to anything.
Then I switched the machine on and tried again......still nothing.
Then I scanned the coffee pack and tried again.....it would tell me "coffee pouch not ready". No idea what that could mean.
So... "roast only" doesn't seem to work yet.


Quality of the grinding?

First of all: I like mocca. If I can't get mocca, I settle for an espresso. Filter coffee is only a last resort to stay caffeinated.
That means I like my coffee ground to a dust. Mocca needs it much finer then even an espresso. So I rely on my Hario Skerton. I usually operate it by hand, so the dust doesn't get hot during grinding.
...
On my first test I didn't manage to get a look at the ground beans before the coffee is made.
This is what the filter looked like afterwards: (Overexposed, so the coffee is clearly visible)
The coarseness-lever was at factory-default = centered.

Check out this test of a Beta machine (in German) to see a photo of what a BETA-machine made.

To be tested later... (This blog posting will be updated.)

Packaging and choice of beans?

 

After seeing the packages given to beta testers here here, I was suspicious.
If the packaging is the coffee filter, how to keep it clean and food-safe during storage and when transporting it?
The photos show packaging with lots of text about the farmer.... yet there is not a single word about the flavor to expect with the associated default roasting-profile not about the choice of beans contained within. (I do prefer chocolate flavours and when looking for them with roasters, I usually found them created with Coffea canephora / Coffea robusta beans.)
I desperately hoped that either this would have changed or the backside of the labels would contain such information.




My machine came with 3 types of beans. Named
"fresh nuts", "almond" and "blueberry".
There is no other indication about what flavor to expect from them when using the roasting profile these bean-packages include.
They do have some information about the farmers but only 2 of the 3 even state what country these farms are in.
They have no indication about what types of beans they are, However I suspect all 3 to be Coffea arabica, not Coffea canephora

Taste?

My first test was "blueberry".
While I know that there are some roasts described of tasting "nutty" or "like almond", I have yet to hear of a "blueberry" taste. My preference would have been a "chocolate like" taste but that was not included.
I am no expert. I only happen to drink and make coffee often.
As stated, I made the first can offline. It worked. I can't make out any kind of specific taste in the coffee. Only that it is definately slightly sour. After a while this turned to only being ever-so-slightly sour. There is no bitterness to speak of. No taste that stands out at all. This can be interpreted as a bad or a good thing.

After slowly drinking half a can of coffee to make up my mind about the taste and leaving the other half at 40°C hot air in my microwave - to keep it warm - , I am too pumped to do a second and third test.

A new day, a new test. Same "blueberry". This time with the grind-settings as fine as it will go. The machine was allowed to have access to GSM cellular services. Identical taste.
I should do a third test with these beans doing "roast only" and allow them to release CO2 for 2 days.

I will have to try "roast only" and have it releae CO2 for 1-2 days to hopefully get rid of the sour taste.

Second bean-type "almond".
The first taste was definately sour. More so then "blueberry". When it has cooled down a little it leaves a bit of bitterness afterwards.

As with "blueberry", I definately have to try it as "roast only" instead.

Third bean-type "fresh hazelnut".
To be tested later...

Burbon Rojo by Rodofo Ruffatti from El Salvador.
Freshly roasted, the same result as the others.
I did not even intend to try this freshly roasted but the "roast only" option was currently not functioning.


"roast only" and then brew after 2-14 days.
Freshly roasted coffee seem to generaly not be to my liking.
I'll try to find coffee-pouches with a pressure-seal (to release CO2) and try to fill them with pure CO2 from a can before I put the beans in. This way they should not contain any Oxygen until I open them for grinding.
See here for the result of this test.

Since I travel a lot. I guess a profile where I can pre-program the machine to roast 1-2 days before I arrive and then start grinding and brewing, when I get home would be great. After all, it is cool and dark in there (no light or non-essential heating while nobody is home) and without the ventilation there should be minimal air circulation.

Milk?

You need to steam your milk separately. For cappuchino, the espresso machine that takes your roasted beans can do that anyway.
Of cause to do that, you would have to pull the power plug at the right time to get to the roasted beans. 
Since it is ment to make filter-coffee, not being able to steam milk is acceptable.

Custom roasting, custom beans, venting?

To be tested later... (This blog posting will be updated.)


Cleaning?

Since the rinse RFID-tag was removed, there doesn't seem to be any way to clean this machine offline.
Even with Facebook and Facebook Messenger, the only option seems to be to "brew only".
There is no indication in the manual or FAQ of using vinegar to remove chalk is recommed.

 


Links: