Application Notes

// 100 Tk = To × 2 (from the datasheet section 8.7.2--To has the units 0.02K)

// Tf = Tk × 9/5 - 459.67 (conversion from Kelvin to Farenheit)

// 100 × Tf = 100 × Tk × 9/5 - 45967

// 100 × Tf = To × 2 × 9/5 - 45967

// 100 × Tf = To × 18/5 - 45967

return (256*high_byte+low_byte) * 18/5 - 45967; // return temperature in units of 0.01°F

}

int main()

{

long object_temperature_f;

clear();

print("press");

lcd_goto_xy(0, 1);

print("button");

wait_for_button(ALL_BUTTONS);

clear();

while (1) // loop forever

{

object_temperature_f = i2c_read_temperature_f();

lcd_goto_xy(0, 0);

// print the temperature in degrees Fahrenheit on the LCD (this code formats it nicely)

if (object_temperature_f < 0)

{

print("-");

object_temperature_f = -object_temperature_f;

}

long integer_temperature = object_temperature_f / 100;

print_long(integer_temperature);

print(".");

long decimal = object_temperature_f - integer_temperature * 100;

if (decimal < 10)

print("0");

print_long(decimal);

print_character(223); // degree symbol

print("F ");

delay_ms(75);

}

return 0;

}

Application Note: MLX90614ESF SMBus Communication with Orangutan Robot

Controllers

Corporation

3. Software Page 5 of 5