Quick library to read from the MLX90614 with python on a Raspberry Pi, using the Adafruit_I2C library

Melexis MLX90614.md

Note that the following code must be run at every boot for this to work, because of the repeated-start requirement:

sudo su -c 'echo "Y" > /sys/module/i2c_bcm2708/parameters/combined'

melexis.py

#!/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)))

Thanks for the great help all.

This code works fine for me.

`

import Adafruit_GPIO.I2C as I2C

I2C.require_repeated_start()

class Melexis:

    def __init__(self, address=0x5A):
        self._i2c = I2C.Device(address,busnum=1)

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

    def readObject1(self):
        return self._readTemp(0x07)

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

    def _readTemp(self, reg):
        temp = self._i2c.readS16(reg)
        temp = temp * .02 - 273.15
        return temp
    
#if name == "main":
sensor = Melexis()
t = sensor.readObject1()
a = sensor.readAmbient()
print("Object: {}C , Ambiant: {}C".format(round(t, 3), round(a, 3)))

`