Thermocouple Temperature Controller:
This project is based on the PIC16F84A processor and utilizes two MAX6675 Thermocouple convertors.
The temperature can be set using the up/down buttons.
When the temperature of TC1 reaches the maximum temperature the relay is de-energized.
When the temperature drops below the low threshold it is energized.
TC1 and TC2 temperatures are displayed to the LCD for visual monitoring.
You can see in the picture above that TC1 is reading 22 degrees C and there is no thermocouple attached to TC2. The relay is 'on' because the
temperature on TC1 has not reached 60 degrees C.
I designed this project around the PIC16f84A but any PIC processor could have been used. I just happened to have several '84As kicking around.