This project is based on the Instructables "Hack a Toaster Oven for Reflow Soldering" by frank26080115 at https://www.instructables.com/id/Hack-a-Toaster-Oven-for-Reflow-Soldering/ Notable differences: 1) It uses an ArduinoUno as the processing element and all of the electronics (except the display, pushbuttons, buzzer, and relay) are mounted on an Adafruit Proto Shield -- all of the components are through-hole components. There is a KiCAD project here. It includes a "four layer" board. Actually I have no intention of creating a "four layer" PCB. I intend to build this on an Adafruit protoshield (Product #2077). The PCB I "designed" with KiCAD is a mock up for the Adafruit protoshield (almost). The red and green layers represent the wiring already on the protoshield, and includes the bus strips. The blue and white "layers" represent the added wiring. The board also provides the approximate component placement. For those people without KiCAD installed, I have included a PDF of the schematic in the file ReflowToasterOven.pdf and some "pictures" of the board in the BoardPictures folder (one is a screen shot of the KiCAD PCB layout and the others are from the 3D viewer). 2) Everything is mounted in a pair of plastic boxes and instead of "hacking" an extension code, an AC power entry module and a pair of AC Receptacles are used. There are three files related to the mechanical construction: ReflowToasterOven-mech.tcl ReflowToasterOven-mech.gcad ReflowToasterOven-mech.dxf ReflowToasterOven-mech.tcl is a Tcl program that generates the ReflowToasterOven-mech.gcad file, which is the input for the GCAD3D program. The ReflowToasterOven-mech.dxf is a DXF file, that can be imported to any 3D cad program. 3) An Adafruit 1.8" *Color* TFT LCD SPI display is used, using Adafruit's graphics library. 4) The software is a "standard" Arduino project. And the code lives in the ReflowToasterOven subdirectory. It compiles successfully and just fits in the Uno's flash memory and only 1/2 of the SRAM is used by static variables, leaving just under 1K for dynamic variables. You will need to install the Adafruit ST7735 and Adafruit_GFX libraries from Adafruit's GitHub repo. You will also need the MsTimer2 library (http://www.pjrc.com/teensy/td_libs_MsTimer2.html). *Most* of the code is copied from the original program by frank26080115. I modified things to use C++ classes and adapted to use the Arduino I/O libraries, the Adafruit ST7735-based TFT display and the MsTimer2 library. I have not built or tested it yet.