How close?

Ever wondered how close you duplicated a previous roast profile? A standard measure in statistics to express the average error between a curve and its target is know as Mean Squared Error (MSE) which computes the average of the squares of the single discrepancies between the data values and their targets.

weight • volume • density

Knowing the density of your raw beans is key to adjust your roast profile. Knowing the density of roasted beans is important for successful blending. Keeping the bean density of a product constant helps to keep your customers happy.

Keep an eye on the delta!

Once you have developed a profile for a coffee you want to precisely duplicate that one in future roasts. Artisan allows to load this successful profile in the background serving as a template for your production roasts. While seeing the delta of your current roast curve and that template helps you to decide if you should slow down or speed up your roast at any moment, especially if zoomed into the graph somewhat. However, often a numeric value expressing this delta is easier to work with. What about adding another LCD to show this delta?

On Idle Noise

This note describes how I improved the measuring system of my roasting machine to get more accurate roast profiles, like the one shown above. I got motivated by the work of Scott Rao.

Artisan v1.6.1

It is our pleasure to announce the release of Artisan v1.6.1. Many issues have been resolved and many suggestions, reported via the Artisan Issue Tracker, have been implemented.

UPDATE March 20, 2019: Artisan v1.6.2 has been released with a bug fix for Mac OS X 10.14.

Running Artisan on Raspberry Pi

This post describes how to install Artisan packaged releases and Artisan source on the Raspberry Pi. The process has been tested on the RPi 2B, RPi 3B,and RPi 3B+ but should work for on any RPi running Raspbian Stretch.

By Dave

Artisan v1.4.0

Here is Artisan v1.4. More than 30 bugs have been fixed w.r.t. v1.3.1 and many suggestions for improvements have been integrated, mostly communicated via our Artisan issue tracker.

UPDATE 17. October, 2018: Artisan v1.5.0 has been released with important bug fixes.