Android bluetooth reflow controller that anyone can build
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An android bluetooth reflow oven that anyone can build

Welcome to the github repository that contains the firmware source code to the bluetooth reflow oven project blog. You'll need to read the blog to understand this project before making use of this firmware.

controller and oven

Build instructions

You might not need to. I've built a .hex file for the ATMega8L that is suitable for users on a 220-240V 50Hz mains supply. I've also built the Android .apk app ready to side-load on to your Android device. The app is compatible with all mains supplies.

You can find this files in the bin/ directory.

But I really want to build from the source

OK, no worries. Let's deal with the app first.

Building the app

This one should be easy. Simply download and install Android Studio from Google. When it's installed you can open up the project file from the android/ directory and build it yourself.

Building the ATMega8L firmware

I built this firmware with avr-gcc version 4.9.2 so you'll need that version or anything more recent. Linux users can use their package installer to get the compiler.

Windows users can use the pre-built package that I created. That's the package that I used to create this firmware. Windows users must also have installed a Unix-like environment such as Cygwin.

I use the scons build system to build my projects. cd into the atmega8l directory and run the following command to build the firmware:

$ scons mains=50
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
avr-objdump -S awreflow2.elf > awreflow2.lst
avr-size awreflow2.elf | tee awreflow2.siz
   text    data     bss     dec     hex filename
   7724      16       7    7747    1e43 awreflow2.elf

I've trimmed the compiler output from the above command. The mains=50 option refers to the frequency of your mains supply in Hertz and at the time of writing I've only implemented timings for 50Hz supplies because I don't have the ability to test against the other common frequency: 60Hz. I'll gratefully accept pull requests from anyone who can supply tested timings for 60Hz.

Now the firmware's built you need to upload it. See the main blog article for USBASP setup instructions. Here's the command to upload the built file to the controller:

$ scons mains=50 upload

We also need to set the fuses on the ATMega8L so that it will use our 8MHz external crystal. Here's how:

$ scons mains=50 fuse

You might need to manually power-cycle (reset) the device after fusing. For some reason that doesn't happen automatically for me.