Using the LM35 with the Micro is quite easy.

Just connect:
(LM35 -> [amazon &title=Arduino Micro&text=Arduino Micro] )

• 5V to positiv
• GND to –
• S to A4

And run the following code (should run on every arduino):

float temp;
int tempPin = 4;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  temp = analogRead(tempPin);
  temp = temp * 0.48828125;
  Serial.print("TEMPRATURE = ");
  Serial.print(temp);
  Serial.print("*C");
  Serial.println();
  delay(1000);
}

Getting this result:

Please note its you might need to adjust the 0.48828125 to a value thats verified with another temperature sensor (or just a normal celsius thermometer) .

The next step for me is to write a little ROS publisher for this sensor.