I stumbled upon a video of someone using a popcorn popper to roast coffee. It seemed simple and a used popper can be acquired cheaply at a thrift store. This was the start of ELF, a roaster designed to produce the world’s best cup of coffee.
My first visit to my local Goodwill produced two Poplite Poppers for the whopping total of $8. I immediately started to use one and experienced beans blowing out of the popper. An extended chimney, made from 3” ductwork from the local hardware store, resolved that issue.
The first batch roasted in under 5 minutes. To slow down the roast I began unplugging the unit for 30 second intervals during the roast. This allowed me to extend the roast to 7-8 minutes.
Tired of unplugging the popper I decided to retrofit the second popper with a thermocouple, ac relay, a raspberry pi, and some web code and the Electric Lights and Fire (ELF) roaster was born.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Eink, E-paper, Think Ink – Collin shares six segments pondering the unusual low-power display technology that somehow still seems a bit sci-fi – http://adafruit.com/thinkink
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.