PTC heating stage ESP32-SOLO

Original open source project link:
Qifan Kechuang QF Maker heating table (https://oshwhub.com/dhx233/pcb-heng-wen-jia-re-tai)
Super simple ESP32 heating table V2 (https://oshwhub.com /false0/esp32-jia-re-tai_copy)
 
The main control uses ESP32-SOLO (garbage pickup inventory);
the temperature measurement uses MAX6675, equipped with a K-type thermocouple, and is fixed inside the PTC using silicone thermal conductive glue. The temperature measurement is accurate and stable;
reserved Buzzer, fan, remove all NTC circuits
and use LAN MQTT, add Homeassistant control;
use VScode+PIO to open the project and
 
use the copper pillars + aluminum pillars + redundant boards to build the overall structure. The bottom layer is for two pieces of heat insulation. Solid wood strips, the overall balance is purely coincidental.
The internal gap of the heating plate is filled with silicone thermal conductive glue to fix the K-type thermocouple.