quick script to convert value to range of hot/cold RGB colours

value_to_rgb.py

# coding: utf-8

import re, subprocess

rgb_array=[(0, 100, 255), (0, 116, 255), (0, 132, 255), (0, 148, 255), (0, 164, 255), (0, 180, 255), (0, 196, 255), (0, 212, 255), (0, 228, 255), (0, 255, 244), (0, 255, 208), (0, 255, 168), (0, 255, 131), (0, 255, 92), (0, 255, 54), (0, 255, 16), (23, 255, 0), (62, 255, 0), (101, 255, 0), (138, 255, 0), (176, 255, 0), (215, 255, 0), (253, 255, 0), (255, 250, 0), (255, 240, 0), (255, 230, 0), (255, 220, 0), (255, 210, 0), (255, 200, 0), (255, 190, 0), (255, 180, 0), (255, 170, 0), (255, 160, 0), (255, 150, 0), (255, 140, 0), (255, 130, 0), (255, 120, 0), (255, 110, 0), (255, 100, 0), (255, 90, 0), (255, 80, 0), (255, 70, 0), (255, 60, 0), (255, 50, 0), (255, 40, 0), (255, 30, 0), (255, 20, 0), (255, 10, 0), (255, 0, 0), (255, 0, 16), (255, 0, 32), (255, 0, 48), (255, 0, 64)]

def temp_rgb(temp, min, max):

        temp=int(temp)
        if temp<min: temp=min
        elif temp>max: temp=max
        index = (((temp - min) * (53 - 0)) / (max - min)) + 0

        output=rgb_array[index]

        return output

def get_temp():

        temp=subprocess.check_output(["/opt/vc/bin/vcgencmd measure_temp"], shell=True)
        out=re.search(r'\d+\.\d+', temp)
        return str(out.group(0))

def main():
        print temp_rgb(-20, -5, 30)

if __name__ == "__main__":

        main()