I have an IC for thermocouples that uses a K-type thermocouple and outputs 10mV per degree Celsius.
I wish to measure a temperature of around 700 degree C so that means the IC will output 7V.
I know I can lower this using an opamp with less than unity gain but I would preferably connect directly to the Arduino.
Is there anyway one can raise the reference for the analog input or is it part of the internal structure of the Atmega328?
Thanks in advance for any assistance.
I posted this in the software section as well, because I am not certain if this can be solved via software.
Is there anyway one can raise the reference for the analog input or is it part of the internal structure of the Atmega328?
No.
You can never put in more voltage to a chip than the voltage that powers it.
Simply use a potential divider to cut the voltage maximum down to 5V, and add a catcher diode to the 5V rail.
It is a hardware problem please remove it from the software section, and never double post again.