In the meantime the features of the machine are widely discussed in th egerman forum. With the support of several member of the forum some improvements have been made and we will produce a next prototype.
Based on the support/work of 2 physicists (calculation based on a model) the thermic system was optimized to get more control over the brewing process.
We also decided to develop a new control unit. The main reason for the idea, is the EU edict 801 which forces coffee machines to go to a stand-by mode after 30 minutes. The machine will be able to do it, but the user can change the time (or switch it off).
Basically there is 1 board which handles all usual functions (water level, seleniod valves, a.s.o).
There also a kind of optional extension board which handles Solidstaterelais, PT100, PID-function, aso.
The control unit is developed based on the Arduino project.
Who like technical details (and understand german) can read about the details here:
http://truly-coffee.de/index.php/de/steuerung" onclick="window.open(this.href);return false;
We decided finally to produce the machine. Actually we can't say anything about date. But as soon as possible. However: quality and save function is having priority.