ESP32 with OLED and MAX6675 to read thermocouples and function as TC4 for recording bean and environmental temperatures for Roastlogger and Artisan coffee roasting software
ESP32:
http://www.lilygo.cn/prod_view.aspx?TypeId=50032&Id=1152&FId=t3:50032:3
ordered via: https://www.aliexpress.com/item/32824839148.html
MAX6675:
ordered via: https://www.aliexpress.com/item/1902975176.html
Thermocouples:
(I've tried a few -- in addition to the ones that come with the MAX6675)
ordered via: https://www.aliexpress.com/item/32848451468.html
ordered via: https://www.aliexpress.com/item/32795229358.html
Pin map for above the ESP32 board:
https://0.rc.xiniu.com/g1/M00/29/CB/CgAGTF1agBWASwmZAAF9zU1LNpY299.jpg
It's just a little code to use ttgo esp32 board with two max6675 and oled -- to work like a TC4 to artisan roasting software