AIR001 heating table

I. Introduction:
A DC low-voltage constant-temperature aluminum substrate heating stage based on the AIR001 main controller. 12V power supply; maximum 120W
. Very low cost; the heating plate uses a free sample aluminum substrate from LCSC; the remaining AIR001 chip cost 1 cent at the time (it seems unavailable now).
II. Reference Project:
DC low-voltage constant-temperature aluminum substrate heating stage with ESP32 main controller - LCSC EDA open-source hardware platform (oshwhub.com)
III. Function Introduction:
1. Constant temperature mode, using NTC resistance measurement, up to 300 degrees Celsius, using PI control;
2. Power-off data saving, saving the last temperature and PID parameter settings;
3. Prominent LED and buzzer prompts during heating;
4. Encoder operation, quick selection and parameter adjustment;
5. Voltage and current detection function (not yet implemented);
IV. Structure and Assembly
: 1. All boards are 1.6mm thick; when prototyping the heating plate, an error in the number of layers will be reported, choose to ignore;
2. The circuit inside the isolation board is a test circuit and can be deleted at will.
3. When installing the heating plate, be sure to use a high-temperature resistant heat-insulating gasket between the screw and the heating plate to prevent the screw from wearing through the oxide layer on the aluminum substrate surface and causing a short circuit (which could lead to a rollover).
4. The copper pillars that fix the heating plate and the heat insulation plate serve as both structural supports and conductors. The copper pillars connected to the heating plate require brass washers with dimensions of 3*8*0.8mm.
5. All screws and copper pillars related to the heating plate's conductivity are M3, with a 6mm thread length for easy installation.
      Other copper pillars that only serve as structural components are M2, with a 3mm thread length.
6. The NTC resistor is a printer NTC resistor from a Taobao seller; it is attached to the back of the heating plate using thermally conductive adhesive.
Structural components include: two types of M3 copper pillars, M3 screws, M3 nuts, M3 brass washers, and M3 steel paper insulating washers; two types of M2 studs; and M2 nuts.
The other

power switches are the cheapest 3-pin self-locking switches found on Taobao, simply because they are cheap…;
the firmware is open source, compiled and downloaded using KEIL, and I used WCHLink for downloading and debugging.
The software is poorly written. To re-encode it, you need to burn it twice. The first time, uncomment line 146 in main.c and select Erase Sectors in the download settings before burning. The second time, comment out line 146 and burn it again to use the settings saving function.
I'm probably too lazy to implement the unimplemented features...

 
Update Log:
2024.09.24: Added a buzzer sound during operation; and fixed some bugs.