mlx90614.cpp

00001 //Melexis Infrared Thermometer MLX90614 Library
00002 
00003 //*****************************************************************
00004 //  Build : 27/10/16 Dave Clarke
00005 //          Only read thermo data.
00006 //
00007 //  This program does not check CRC.
00008 //  If you want to check CRC, please do it your self :)
00009 //****************************************************************// 
00010 
00011 #include "mlx90614.h"
00012 
00013 MLX90614::MLX90614(I2C* i2c, uint8_t addr){
00014 
00015     this->i2caddress = addr;
00016     this->i2c = i2c; 
00017     
00018 }
00019 
00020 
00021 bool MLX90614::getTemp(float* temp_val){
00022 
00023     bool ch;                    // Check flag for ack
00024     char data[3];               // Raw data storage
00025     char ram[1] = {0x07};       // RAM address what temperature is stored
00026     char readaddr = 0xB5;       // Read Data address
00027     uint16_t  temp_thermo;
00028        
00029     ch = i2c->write(i2caddress, ram, 1, true); // ping i2c with address and RAM location
00030     if (ch) return false;                      // check for ack
00031     
00032     ch = i2c->read(readaddr, data , 3); // read raw temperature value
00033     if (ch) return false;               // check for ack
00034 
00035     temp_thermo |=  data[1] << 8;   // make MSB
00036     temp_thermo |=  data[0];        // make LSB
00037 
00038     *temp_val = ((float)temp_thermo * 0.02) - 273;  //Convert kelvin to degree Celsius
00039    
00040     return true;                            //load data successfully, return true 
00041 }
00042 
00043