This code uses the Arduino as a simple I2C to Serial relay, leaving all of the calibration and image processing to Python code running on the PC host.

(ATmega-based Arduinos like the Arduino Nano do not have enough RAM to hold the 16-bit 32x24px image in memory, so the usual MLX90640 libraries do not work.)

python MLX90640.py /dev/tty.usbserial-XXX