Friday, February 24, 2017

Artisan v1.0


After a long journey that started at the end of 2009, the development of Artisan finally reached version 1.0. Download it from the Artisan GitHub page. This one introduces only a few new features w.r.t. the previous one, but adds some small improvements and bug fixes. For the full list of changes and additions see the Artisan change log.

Tuesday, February 14, 2017

Roast Phases, Statistics and Phases LCDs


The coffee roasting process is often discussed with respect to its separate roasting phases. Splitting not only makes it easier to get complex things into our small heads, but also allows for colourful roasting graphs.

Monday, February 13, 2017

Giesen Roaster Connected


A number of people have asked how best to connect their Giesen coffee roasters to Artisan. Here is a quite elegant solution by Barry that brings his Giesen onto the network for remote access. He owns a 2016 Giesen W6A propane drum roaster, which is equipped with the dual probe options by the factory. So it has a PT100 dual probe measuring environmental temperature (ET) as well as another PT100 dual probe measuring bean temperature (BT). For each of those probes, one channel (pair of wires) is connected to the Giesen control panel. In the following Barry shows how to connect the second channel (pair of wire) of each probe to some magic, such that Artisan can log its readings over the network.

by Barry Randall

Friday, January 20, 2017

Connecting Phidgets on Linux


To get up and running Artisan under Linux using Phidgets is not completely trivial (but doable). While the installation of Artisan should not pose any problem if the installation instructions are followed, getting Artisan to read data from connected Phidgets needs some preparation.

Thursday, November 24, 2016

Area under the Curve (AUC)


The idea that the area under the temperature curve could be an indicator on how much total energy the beans might have receive during the roasting process popped up already some years ago. While the rate-of-rise (RoR) of a temperature curve, calculated as the first (discrete) derivation, gives the current "speed" of the temperature increase and allows to predict the future, the area-under-the-curve (AUC) describes the past.

PID Control


A PID controller is a control loop feedback mechanism commonly used in industrial applications. – PID Controller, Wikipedia

Monday, October 10, 2016

Die Zweite Deutsche SCAE Röstmeisterschaft 2016



The second German SCAE coffee roasting championship took place last week on 5-7 October @Probat in Emmerich. It followed very closely the protocol and style of last year's roasting championship.