Hi,
I made a project for my classes and I want to share it and produce actual board to make an oven controller.
ESP-01 can send orders to Atmega, but you cannot make something stupid, unless you do it on Atmega firmware.
Screw terminal is connected to the ADC, to get signals from termistors.
There is also a primitive interface, so you can use it without smartphone. Maybe next time I will use an OLED touch screen.
https://github.com/karoldem/relduinoIoTpiekarnik.xlsx (12.4 KB)
prices are in PLN. I will correct it one day maybe.