MLX90614 Temp Sensor over I2C

[digi_guy]

Hey guys,

I've been trying to get an infrared thermometer working over i2c, but currently my readings are way off. It's the MLX90614 from Adafruit, using their library from github
https://github.com/adafruit/Adafruit-MLX90614-Library

My guess is that it was written for a different arduino and needs to get ported for the Oak, but I'm not sure where to start with that. The output I get is

Code: [Select]

Ambient: 536870912 Temp: 1083192883
My second guess is that I'm not reading/writig the variables properly. When I changed the temps to integers I get

Code: [Select]

Ambient: 34 Temp: 35
If anyone has any thoughts I'd greatly appreciate hearing them.
Thanks

Code: [Select]

/***************************************************
  This is a library example for the MLX90614 Temp Sensor

  Designed specifically to work with the MLX90614 sensors in the
  adafruit shop
  ----> https://www.adafruit.com/products/1748
  ----> https://www.adafruit.com/products/1749

  These sensors use I2C to communicate, 2 pins are required to 
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries. 
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Wire.h>
#include <Adafruit_MLX90614.h>

Adafruit_MLX90614 mlx = Adafruit_MLX90614();

void setup() {
  Particle.publish("Status", "Adafruit MLX90614 test");
  mlx.begin(); 
   
  double ambient =   mlx.readAmbientTempC();
  double tempC =   mlx.readObjectTempC();
   
  char buff[64];
  sprintf(buff, "Ambient: %d Temp: %d", ambient, tempC);
  Particle.publish("Ambiant", buff);
 
}

void loop() {
}



[masrodjie]

I know it's old but maybe it can help for others.
You can use dtostrf function.

Code: [Select]

/***************************************************
  This is a library example for the MLX90614 Temp Sensor

  Designed specifically to work with the MLX90614 sensors in the
  adafruit shop
  ----> https://www.adafruit.com/products/1748
  ----> https://www.adafruit.com/products/1749

  These sensors use I2C to communicate, 2 pins are required to 
  interface
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries. 
  BSD license, all text above must be included in any redistribution
 ****************************************************/

#include <Wire.h>
#include <Adafruit_MLX90614.h>

Adafruit_MLX90614 mlx = Adafruit_MLX90614();

void setup() {
  Particle.publish("Status", "Adafruit MLX90614 test");
  mlx.begin(); 
   
  char ambient[64];
  char tempC[64];
  dtostrf(mlx.readAmbientTempC(), 2, 2, ambient);
  dtostrf(mlx.readObjectTempC(), 2, 2, tempC);
  char buff[64];
  sprintf(buff, "Ambient: %s Temp: %s", ambient, tempC);
  dtostrf(temp, 2, 2, msg);
  Particle.publish("Ambiant", buff);
 
}

void loop() {
}