#!/usr/bin/env python3

from adafruit.i2c import Adafruit_I2C

class Melexis:
    def __init__(self, addr=0x5A, fahrenheit=False):
        self._i2c = Adafruit_I2C(addr)
        self.mode = fahrenheit

    def readAmbient(self):
        return self._readTemp(0x06)

    def readObject(self):
        return self._readTemp(0x07)

    def readObject2(self):
        return self._readTemp(0x08)

    def getDifference(self):
        """Returns how much warmer the object is than the ambient
        temperature."""
        return self.readObject() - sensor.readAmbient()

    def _readTemp(self, reg):
        temp = self._i2c.readS16(reg)
        temp = temp * .02 - 273.15
        if self.mode:
            return (temp * 9 / 5) + 32
        else:
            return temp

if __name__ == "__main__":
    sensor = Melexis(fahrenheit=True)
    t = sensor.readObject()
    print("Object: {}ºF ({}ºF warmer than the ambient temperature)".format(
        round(t, 3), round(sensor.getDifference(), 3)))