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)))

As Adafruit_I2C library has been update these code are not running.... I tried a lot , if you can please help

#!/usr/bin/env python3

import Adafruit_GPIO.I2C as I2C

class Melexis:

def __init__(self, address=0x5A, fahrenheit=False):
    self._i2c = I2C.Device(address)
    self._mode = fahrenheit

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
    if self.mode:
        return (temp * 9 / 5) + 32
    else:
        return temp

if name == "main":
sensor = Melexis(fahrenheit=True)
t = sensor.readObject1()
a = sensor.readAmbient()
print("Object: {}F ({}F warmer than the ambient temperature)".format(
round(t, 3), round(t - a, 3)))

In this code i am getting following error
pi@investigation ~ $ python3 /home/pi/Desktop/mouse_temp1.py
Traceback (most recent call last):
File "/home/pi/Desktop/mouse_temp1.py", line 30, in
sensor = Melexis(fahrenheit=True)
File "/home/pi/Desktop/mouse_temp1.py", line 9, in init
self._i2c = I2C.Device(address)
TypeError: init() takes at least 3 arguments (2 given)

Change the line self._i2c = I2C.Device(address) to self._i2c = I2C.Device(address,busnum=1). There are a few other minor typos in your code, but it basically works.

Sorry, can you help me???When i try to run to code, I get the following error...
Traceback (most recent call last):
File "melexis90614.py", line 34, in
sensor = Melexis(fahrenheit=True)
File "melexis90614.py", line 8, in init
self._i2c = Adafruit_I2C(address,busnum=1)
NameError: global name 'Adafruit_I2C' is not defined

How can I fix this problem???Thank you so much

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)))

`