James Lewis
Published © CC BY

Open Vapors

Open source reflow oven controller, based on a solid-state relay (SSR).

IntermediateShowcase (no instructions)8 hours1,580
Open Vapors

Things used in this project

Hardware components

Toaster Oven
Used to make toast, now it makes PCB
Open Vapors Controller
AVR 32u4 Board (like Arduino Leonardo) with custom headers
Crydom D2425 Solid State Relay
25A SSR. For a 10A Oven. Heh.
Adafruit RGB backlight positive LCD 20x4
For all the pretty

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)
Laser cutter (generic)
Laser cutter (generic)


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Custom parts and enclosures

PCB Spacers

STLs of the spacers used for each PCB in Open Vapors. (Control board used standard stand-offs.)

Engraved Panels

Raster cut on laser cutter with 2-color acrylic.

Side Panel

Cut two of these.

Top Panel Cover

Bottom Panel

The interior vectors are meant to be raster (or lightly engraved).


Control Board PCB

Created in EAGLE 6

Control Board Schematic

Created with EAGLE 6



Code to drive the SSR and Menu. There is a separate program to flash the 32u4 to preset the EEPROM. Or you can just manually set the EEPROM settings from the primary firmware.


James Lewis

James Lewis

11 projects • 594 followers
Electronics enthusiast, Bald Engineer, and freelance content creator. AddOhms on YouTube. KN6FGY.