2.1.3 Thermocouple
The board is standard designed to use 100K thermistors, these are sold by most
3D printer equipment suppliers.
A thermocouple for the extruder temperature may give better temperature
readings/control-performance for the extruder.
This is a thermocouple board from reprapworld.
It can be connected to the thermistor input after removal of R7.
The left screw of the interface board is connected to the temperature output of
the thermocouple board. The right screw is GND.
2.1.4 Voltage to temperature translation
The temperatures are determined from the input voltage via a table. If the
software is started in 3D printer mode for the first time, default tables are
generated in files extruderVoltTempTable.txt and heatBedVoltTempTable.txt.
The file is a list of <volt> <temperature> values.
Volt is the value read in the IO screen, analog 1 is extruder and analog 2 is
head bed temperature sensor voltage. The volt value is a value between 0 and
1023. The temperature is in Degree Celsius. The maximum number of values is
the table is 60. Note that for a thermocouple you will need theoretically only 2
sets of Volt-Temperature values because it is linear.
