A home espresso machine that provides commercial quality temperature and pressure consistency at an affordable price. Read more
This project was successfully funded on January 20, 2012.
Calling All Contacts
We’ve just been informed that the programmer/software developer who was supposed to be coding our GUI is currently facing an unexpected and dire personal situation which is affecting his ability to work on this project.
Consequently, we’re searching for a new software/firmware engineer who will be able to carry the coding of the project through to completion. (The software and board design are currently being done by the same company. They’re still approaching completion of the board design, but it looks like we’ll need to bring someone else on board for software development.)
The design firm is searching, and we’ve reached out to our various alumni/professional networks, but you guys are pretty much the best network of people who know about the project and have an interest in seeing it completed quickly and competently - so we’re issuing a call for help!
We need a firmware engineer with experience in GUI programming/development, who is familiar with the LPC1788 and IAR Embedded Workbench for ARM. Someone in Atlanta or the southeast is ideal, but not required. Familiarity with espresso machines would be great, but we know that’s a tall order.
Shoot an email to email@example.com if you or someone you know fits the bill, or if you have any other questions.
We’ve been pulling shots on the machine for an hour or two, and it’s looking good (at least the machine is; we’ve gotten a bit rusty). Something to note is that, currently, the pump PID is set in 10 increments from on to off, so the pump sounds a little choppy. Since the resolution of pump rates is so low, you can clearly hear what’s going on. The pump pumps at a rate bringing the pressure up to 9 Bar, stops pumping as it’s about to overshoot, and starts pumping again as the pressure drops slightly. The result is that the pressure and flow rate throughout the shot remains in a narrow range.
Ultimately, the number of increments will be higher so there will be less of the “on-off” feel of the pump, but this is a good acoustic representation of how PID works.
Igor, Gleb, Janet & Rachel