Bought this at a thrift store for $5. It had an old home alarm system inside. The sticker in the upper corner stays. Made in the U.S.A.
This is a wall hanging device. There is a bevel on the top that mates to an opposite bevel inside the roaster cabinet. This makes it easy to hang and remove. You can see it on the inside of the popper shelf in later photos.
Bought this off Ebay for $25. It has a universal AC motor, cast aluminum, Bakelite, and ceramic around the heater coils. Newer poppers are cheese. The only popper that is better is the original Poppery.
I bought several of these timers for the digital timers . In the background you can see a couple of the camera triggers I designed. But why is this important?
Here is one of the several leftovers from my last project. Lucky I saved them because they make great 15A relays. Just add an LED and shorting two wires together makes it work. No need for control electronics, just simple switches!
I designed a layout for the front of the panel and cut out some holes. Arranged are most of the components I scrounged from my stuff and others were purchased.
It is coming together. One of those projects that you don't really know what is going to look like until it is finished.
Got the AC stuff in. I bought a heavy gauge power cord for the main AC input. Bought an (orange) three way at the 99 cent store that worked out great. One relay to activate main power from the key switch on the panel.
The other two relays are the heater fan and the cooler fan. The heater is controlled by the Solid State Relay (SSR) in the upper corner. The transformer boosts AC to the dimmer which controls bean agitation. The outlets are for the heater, heat fan, cool fan and a powered spare (maybe for lighting later on).
From the top; Emergency Power Off (EPO) switch, a Solo Temperature controller, a bi-lighted push button switch to turn on the cooling fan when needed, a $10 Chinese 0-150 VAC panel meter to indicate heat fan power controlled by the dimmer knob. At bottom is key power and neon power indicator lamp.
All done wiring.
The EPO controls power to the SSR and to the heat fan relay. When the roast is done, just hit the mushroom button!
The cabinet is a refugee from a kitchen remodel. Small enough to hang on the wall in a corner of the garage. It's going to make my weekly roasting a pleasure.
I employed some light sheet metal in the popper area in case I want to later recirculate some of the heated air back into the roasting chamber to save energy. The cooling fan shelf pulls out courtesy of some savaged drawer slides. (Thanks Josh!)
UPDATE: Silly me. Don't vent the hot air back into the popper, the universal AC motor uses the intake air for cooling. I had to replace the thermal fuse on the motor.
No, it's not broken, the front half of the shelf hinges down to dump the beans after the roast is done. What I don't show is the stainless wire basket that sits on top of the fan. Also, here you can see the wall hanger in action holding the cabinet to the wall.
Oh yea, this $8 fan swivels to an upright position that makes sliding it into storage position a snap.
I was wandering Home Depot and saw this internal spring door closer. Add two hinges and bolt the popper to the moving portion to make dumping the beans quick and easy. Looks crooked, don't it? I have recently remounted it to be straight.
A good shot of the probe. The drilling was very easy, and it is working well for supplying bean temperature to the controller.
The 3" diameter Pyrex tube is from a 12" long bread baking tube made by Corning. Another Ebay item. I actually cut it to a 5" length using my tile saw and a steady hand. The cut ends were sanded smooth with wet/dry sandpaper and elbow grease.
My com port and heat probe inlet. To the right is the 3" elbow exhaust which slides up with the Pyrex to allow the beans to be dumped. I have yet to design and build the tube raising mechanism. You can see the PID ramp/soak controller under the EPO. By using loaded profiles (via my workbench laptop) the green bean load is started with a push of a button. When the roast is done, the EPO is mashed, cooling fan button pushed, and beans dumped into the cooling basked. As easy as 1, 2, 3.
The preliminary exhaust. Definitely an area for improvement. I have recently mounted this properly. I also plan to make a "hat" style of chaff collector during the winter so that the roaster can vent out the top and warm up the garage.