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Last Arduino/ESP8266 project (click to open)
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Software:
Download my SousVideSonoff project here.
Use the latest Arduino IDE and Arduino/ESP8266 libraries or, if you are an advanced programmer, PlatformIO.
Addresses of te used third-party libraries in de ino and header files.
The HTML is a simple test and demonstration of SousVideSonoff . Develop your own (graphical) user interface in HTML/JavaScript and use these filess as a guide.
The SousVideSonoff webSocket Server must have a static IP.

Edit this:
In SousVide .html: edit the edit this section, read readme.txt.
In SousVide .ino/h: edit the edit this sections.

PID control - Auto Tune PID:
The Arduino PID library a very good choice. I use this PID library in my Sous-vide projects, with an accuracy of 0.06°C.
The ideal Kp, Ki and Kd (PID) values are depending on the power and water content.
Run the Auto Tune command once.
Start from browser the auto tuning mode (± 1-3 Hours). The calculated PID parameters are displayed and saved in the Sonoff module.
If this module is used in different kettle/cooker then note the Kp, Ki, Kd parameters for each kettle/cooker and use command setPID.
Now the sous-vide pan is ready for cooking.