SMT oven

SSR 13A(min) 220V
Max6675 Thermocouple-to-Digital Converter
Thermocouple K-type
LCD Mon(?)
==========================
Controler On/Off
Current Temp, Target Temp
Upper/Lower Heater, On/Off
PWM State (LED)

Block dragram:
Thermocouple -> Max6675 -> Arduino -> (PWM)-> SSR -> Oven