Attached is a 3d mockup of the board. Board size and mounting hole placement is same as the original. I hope to be able to test the custom PCBs in a couple of weeks.ronncat wrote: I would love to have information on your custom voltage regulator board as that seems to be a great way to approach this.
Yes you can use the existing ones, but I decided to keep the original boards intact, and get 2 new ones. They are identical in shaft size, and I reuse the original knobs. Any generic linear taper pot (5-10K ohms is ideal) will work, and the ones I got (P160KN-QD15B10K) were about $0.75 each. These are wired directly to the Phidget hub. When you rotate a knob, it sends a quantifier signal through Phidgets HUB (Voltage IN) to Artisan, which logs the change and sends the corresponding command OUT through Phidgets to the motor.ronncat wrote: Also would love to know how you incorporated the potentiometers into the fan and drum speeds. Can you use the existing ones on the Cormorant and wire them to the hub? This would be very slick as it would still offer manual control to the roast.
[Edit: There can be a small lag of a second or so between turning the roaster knob and seeing the voltage change on the roaster volt meter, which is not objectionable to me. I also have specific marks around the dial for commonly used voltages. This minimal delay can be reduced by lowering Artisan's sampling frequency.]
From an automation design philosophy standpoint, during a roast, I try to keep my interaction with Artisan limited to logging main events like Charge and FC, and have all my control inputs on the roaster logged automatically. (I am of course monitoring data on the screen during roasting -for me this feedback from Artisan is invaluable). Therefore my decision not to use an actuator for the diffuser, but just keep it simple and auto-log diffuser position changes.
Yes I will certainly hit you up for some info. I am currently away from the roaster, but hope to be back on it in a couple of weeks. I do have some questions re the gas control - please excuse my ignorance - this is not an area of expertise for me. It looks like you have the needle valve between the first stage regulator (on the propane tank) and the second stage regulator (in the roaster). Any thoughts about putting the needle valve control after the secondary regulator? I'm also assuming you use the built-in combo valve/igniter on the roaster - do you leave it wide open after ignition?ronncat wrote: Let me know if I can be any assistance with your gas hookup. At least you will know which valve worked for me. Still 4 of them left last time I checked ebay. Definitely could downsize the stepper motor as well.