Reflowduino - Wireless Reflow Controller Ecosystem

The Reflowduino project is a complete ecosystem of open-source hardware designed specifically for DIY reflow control!

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The Reflowduino project is a do-it-yourself (DIY) reflow ecosystem consisting of open-source hardware specifically built for wirelessly controlling your own reflow oven while maintaining full flexibility in programming, and offering a bunch of features, all with great documentation!


The Reflowduino project is an entire do-it-yourself (DIY) reflow ecosystem consisting of open-source hardware specifically built to make it easy to control reflow appliances and apply PID temperature control while maintaining full flexibility in programming and usage while offering a bunch of features.

The Problem

Do-it-yourself PCB designers are having to painstakingly solder surface-mounted components by hand which not only takes good eyes, stable hands, and a ton of patience, but is also really inefficient and never produces results quite as good as production-quality boards. Moreover, although there are small reflow ovens commercially available, their price tags are a bit stiff and they usually ship with proprietary software that can't be modified easily.

Fortunately with the Reflowduino ecosystem designers can build their own reflow oven setup for a fraction of the price of commercially-available reflow ovens and with the flexibility to change the code, add as many features as needed to make it as simple or as fancy as desired, and learn throughout the process! Since I'm a firm believer of great online resources having learned everything on my own aside from my Mechanical Engineering degree, I'm sharing all of this as completely open-source for everyone to enjoy, including EAGLE PCB files, Arduino IDE example code, sample Android app for Bluetooth control, and full tutorials on how to modify a toaster oven to start cookin’!

You can find all design files, example code, demo app, and wiki on the Reflowduino Github page!

That being said, I do offer the boards listed below for sale on my website and on Tindie. Each order helps me out a little bit in creating and sharing new projects with everyone! :)

The Reflowduino ecosystem includes multiple pieces of hardware which I'll describe below. Although best suited for PCB reflow applications, each one can be used not only for reflow purposes but also as standalone learning tools or for other applications!

Reflowduino Basic

The classic Reflowduino board is an all-in-one Arduino-compatible controller board that can easily transform a toaster oven into a reliable reflow oven! It sports a versatile ATmega32u4 microprocessor with micro USB programming interface, an integrated MAX31855 K-type thermocouple interface with noise filtering, Bluetooth Low Energy (BLE 4.0) for easy pairing with a mobile device, LiPo battery charging and status indication, and buzzer for playing your favorite melodies.

Reflowduino Pro

Although it is more or less retired due to a lack of user demand, there's another version, the Reflowduino Pro board which is just the Reflowduino Basic but with an added solid-state relay on-board:

ESP32 Add-On Module ("Reflowduino32")

With the onset of the ESP32 craze I also created an ESP32 "backpack" module that plugs into this common "DOIT" ESP32 development board to give it convenient thermocouple and relay interface for easy reflow control while still communicating over Bluetooth Low Energy, but this time using the ESP32's built-in Bluetooth.

Sidekick Relay Module

To make it super easy to control practically any high-power AC appliance I also designed a high-power solid-state relay module which I fondly dubbed the "Sidekick" because it perfectly complements the Reflowduino or Reflowduino32 boards for reflow applications.

Reflowduino Tech Specs

The Reflowduino comes in two varieties, the Reflowduino Basic which doesn’t include a solid-state relay (think Arduino Uno form factor), and Reflowduino Pro, which has a solid-state relay already mounted on-board. Below are some quick technical specifications for the Reflowduino:

  • ATmega32u4: This nifty little microcontroller is the same powerful brains of the well-known Arduino Leonardo with USB-to-serial conversion all handled inside the chip! The board operates at 3.3V, not 5V, so please use level shifters...
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  • 1 × Reflowduino The Reflowduino Pro comes with a solid-state relay already mounted and ready to go. The Reflowduino Basic doesn't have the relay so you would have to select your own relay or use the Solid-State Sidekick as the most simple method! You can also use the Reflowduino32 along with an ESP32 dev board instead of the Reflowduino.
  • 1 × Toaster Oven OR Hot Plate I personally used a cheap $20 toaster oven from Walmart, and it worked great! You could also use a hot plate, but please note that these may not be as good as toaster ovens for reflow, at least without doing some testing and software tweaks first!
  • 1 × Solid-State Sidekick Relay Module The Solid-State Sidekick is a single solid-state relay module that allows you to simply plug in the appliance you need to control as well as the two relay control wires from the Reflowduino via a screw terminal, and you're all set! This is by far the easiest and safest method.
  • 1 × "DOIT" ESP32 Dev Board You can find it here:
  • 1 × Reflowduino32 Add-On Module The Reflowduino32 plugs into the ESP32 dev board and gives it thermocouple and relay interface via two screw terminals for easy connection.

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