I haven’t got the ambition to do a full post today, but here’s the state of the world:
Full Interface Board
After the longest 15 days ever, this board is finally at the fabricator. It is missing the USB crystal and I have changed the pinout of the button and LED board connector, but this revision is what it is and will at least be good for troubleshooting. Parts are mostly on order.
These boards finally arrived, and what do you know, they’re just too small to use comfortably. I have redone the board, replacing the switches for larger ones and the LED for a slightly larger common-anode unit to trim cost and aid availability. The new board is 60% taller and the exposed area is slightly wider to accommodate the larger switches, but the board area is fairly comparable so the cost is similar. I will write a full post and release the documents on the new board sometime soon.
Simple interface board
Also has made it to the fabricator. Parts are also on order. This is likely to be the first board that gets built, as it will allow me to test out the panel. Keep an eye out.
Reflow oven mod
I have installed the insulation and the air exit port. The insulation makes a dramatic difference in the speed at which the chamber heats and cools (it heats to 260C a full minute ahead of the noninsulated chamber, and cools much more slowly). I am still contemplating how to install the air intakes and diffusers, so that’s the major mechanical holdup at this point. Electrically, I am awaiting parts in order to model them for PCB footprints, but at least some of what I’ll need (such as the enclosure) are on order. SSR is in house now, as are the thermocouples; thermocouple interface ICs are on order.
iPad touchscreen breakout
Boards are at the fabricator, parts are on order. Should be in on Monday. Maybe these will be the first ones to be built up. Research progress on the digitizer is halted pending the build of the boards.
Sure seems like I have a lot of things going on right now, mostly waiting on fabricators. I could use a faster board house than OSH Park… but it’s hard to beat the price. How can anyone be making money when I get three boards shipped to my house for $2.50?