Hot air coffee roaster control board - open source version

This is a main control board for a full-heat-air coffee roaster, suitable for DIY use. It features two temperature acquisition channels: BT and Inlet, using a MAX6675 K-type thermocouple for wireless connection to an Artisan 0-10V output to control a SCR fan using 12/24V brushless control. An I2C interface is provided for connecting extended sensors, OLEDs, etc. The current open-source board program functions as follows: 1. Wireless connection to Artisan to record temperature data; 2. Manual control of fan and heating power. **
Important Note:** The K-type thermocouple's temperature linearity is only suitable for general use… If possible, use a PT100/PT1000; using a SCR for heating power output is less damaging to the heating wire than a PWM signal, and the price difference in controllers is minimal. For DIY, please use reputable brands; for other software functions, please contact me privately [grinning face emoji]. This
is an open-source project; no technical support is provided. Please participate based on your own development conditions and experience.
Firmware open-source address:
https://gitee.com/sakunamary/Roaster_controller_opensource
 
Operation video references:
1. https://www.bilibili.com/video/BV1eg411e7H4/ (How to connect the module to Wi-Fi)

2. https://www.bilibili.com/video/BV1et4y1w7i5/ (How to connect to Artisan)

3. https://www.bilibili.com/video/BV1AV4y1L7yL/ (Basic Artisan operations)