3D Printer RGB LED MAX31855 Heatbed warning light.

Using MAX31855 chip is better

The 2M Wire K Type Thermocouple Temperature Measuring
Probe Sensor is conected to a MAX31855

The MAX31855 then feeds data into an Arduino Nano which
controls the output to the RGB LED

Download Arduino Nano code:-
USE_3D_Printer_RGB_MAX31855.imo
https://1drv.ms/u/s!AjFFUc7muc09hDAkb8BbSts0-anN