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Good espresso is: Correct temperature. OK, a lot of other things, but the temperature dryer has a significant impact on how well the flavor of the coffee bean is extracted. Of course, if the coffee is already bad, no good espresso can come out.
So the question arises: How does my 30 Euro eBay bargain behaves in this discipline? The Morphy Richards 47507 is a small unit heater machine, ie it contains no kettle, but heated on a heating block the water directly. The procedure dryer is similar to a water heater. The advantage dryer of this technique is the low pre-heating. dryer But for this technology has the disadvantage that the temperature of the brewing water are unstable.
After a brief look at my workbench, the choice of material is also clear: A DS18S20, combined with an Arduino clone. The DS1820 is a One-Wire temperature sensor with an accuracy of 0.5 degC. A simple Arduino Sketch for reading is found quickly. The whole thing was quickly soldered together and fastened with Sugru on thermoblock:
The Sugru must harden overnight. Today I then made a small measure. The DS1820 can measure temperatures up to 125 degC - while the vapor phase is sufficient, unfortunately not. Pity, because the sensors are accurate and easy to use. Sugru is the way to 165 degC stable, and therefore perfectly suitable as mounting material in coffee machines. The temperature profile is as follows:
This of course is relatively dryer far away from the optimal brewing temperature. dryer A Rancilio Silvia has a similar problem, but which you can remedy by means of a PID controller. When preparing a course Cappucinos following occurs:
The first vertical line (T = 2300) I made a blank reference. The temperature then drops quite strongly. At T = 2475 I then started to respect, so 175 seconds (about 3 minutes) after the vacancy reference. The temperature was a little too low. At T = 2615, I then switched to steam, the heat indicator was at T = 2576 again. The temperature still was too low, when I turned on the steam tap at T = 2615 - there came only a warm breeze from the steam wand. The temperature in the heating block, however, dryer continues to rise - at 127 degC is clipping the sensor, the temperature was but I think well over 130 degC.
The espresso was actually acceptable. Unconsciously I quasi operated temperature surfing. In the future, dryer I'll wait three minutes after the vacancy reference dryer easy, then the temperature relatively close to 95 degC should be.
Alternatively, I could of course also be retrofitted a PID controller - but the effort is not worth it for the little machine. I'll do that then after the next upgrade ;-) materials dryer The Arduino sketch for evaluating the DS1820 The R-scripts to produce the plots the readings for the future: Bare Bones Coffee controller, PID control based on an Arduino. Legal similar dryer approach: The PID Project - I however found later. Comments
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