I have very little knowledge of PCBs and electronics, so bear with me.
I have a requirement where I have to read the temperature of an object. The thermocouple part has been figured out and currently we have a very simple setup with an Arduino Uno using a MAX6675 (thermocouple ADC) and displaying the temperature on a LCD.
Next step of the project is to to eliminate the LCD, try to design a custom PCB which contains the microcontroller, ADC (it doesn't have to be MAX6675) and accessories to send the data to a host PC or save the data in an SD card, whichever is feasible and the program for all of this.
The reason for a custom PCB is because the PCB has to be around 18mm in diameter as it will be mounted on the object whose temperature has to be measured. It needs only one input and output as we will be measuring just one temperature point with one PCB.
Is this all possible in a custom PCB and can it be made that small?
I am trying to educate myself and look for possible problems before I talk to PCB manufacturers.