Coffee Roaster Firmware

Feature Overview:

• Load, create, and export custom Roast profiles.
• Ability to record a "live" Roast profile.
• Roast screen to see live/current and target roast values, with a graph.
• Wifi and BT connection support with web/mobile app to monitor and control the roaster remotely, and also load and export profiles (todo).

Sensor and Hardware Control Support

These are the pieces of hardware (ie. features) this application supports:

• Heater (temperature)
• Motor speed (drum turn speed)
• Fan speed (exhaust)
• Smoke sensor (if installed)
• Eject door control
• Cooling motor speed
• Cooling fan speed

Roast Profile Features

• Each roast profile can define target parameters for any given hardware control (ie. heater, motor speed, fan speed), at any given point in time.
• A slope can also be added between values in order to transition from the previous value to the next at ie. linear, logarithmic, or exponential speed.
• Options can be configured to set a roast profile's:
  • Stop time (time to automatically eject)
  • Smoke exit limit (eject when the smoke sensor, if configured, reaches a specified value for longer than a specified duration)

Development

Technical Feature Overview (code internals):

• Built on custom generic Application framework (reusable), extensible, easy to use:
  • Includes a custom ViewManager and View model which allows for React-like component heirarchies that can send state updates (to redraw UI/screen), or receive hardware control events (ie. if a View wants to handle a particular button press or anything else).
  • Includes a custom ViewRenderer that will transcribe any given "rendered" View to a configured Screen (ie. output), according to a given Style schema (global or per view). Todo: define style API. The ViewRenderer can also scale the rendered output to conform the view to any screen dimensions, or section of it (ie. minimap/thumbnail view, or just to have a responsive UI across any screen or screen ratios.
  • Framework exposes common Control elements such as Button, Screen, Thermocouple, Jogwheel, etc. More todo.

Setup:

Requirements:

arduino-cli

Install Arduino libraries:

arduino-cli lib install ArduinoSTL
arduino-cli lib install TFT_HX8357

If you can't install the TFT lib above, install it manually into your global Arduino libraries directory from here: https://github.com/Bodmer/TFT_HX8357

Note about ArduinoSTL (v1.3.3) (as of 11-5-22):

Using this library is throwing the error:

new.cpp.o (symbol from plugin): In function `operator new(unsigned int)':
(.text+0x0): multiple definition of `std::nothrow'
arduino-app/build/libraries/ArduinoSTL/new_handler.cpp.o (symbol from plugin):(.text+0x0): first defined here

To get around this, you must comment line ~22 in ArduinoSTL/src/new_handler.cpp: // const std::nothrow_t std::nothrow = { };

This should allow arduino-cli to compile the program.

Build the Arduino sketch:

./build.sh

Upload to Arduino sketch:

Edit upload.sh to specify your board's correct COM port, then run: ./upload.sh