Added the functions to read and set the emissivity of the sensor.
Diff: mlx90614.cpp
- Revision:
- 1:4a60d3f1e91e
- Child:
- 2:01d333d06727
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mlx90614.cpp Thu Jun 09 13:07:40 2011 +0000 @@ -0,0 +1,45 @@ + +#include "mlx90614.h" + +MLX90614::MLX90614(I2C* i2c,int addr){ + + this->i2caddress = addr; + this->i2c = i2c; + +} + + +bool MLX90614::getTemp(float* temp_val){ + + char p1,p2,p3; + float temp_thermo; + bool ch; + + i2c->stop(); //stop i2c if not ack + wait(0.01); + i2c->start(); //start I2C + ch=i2c->write(i2caddress); //device address with write condition + + if(!ch)return false; //No Ack, return False + + ch=i2c->write(0x07); //device ram address where Tobj value is present + + if(!ch)return false; //No Ack, return False + + + i2c->start(); //repeat start + ch=i2c->write(i2caddress|0x01); //device address with read condition + if(!ch)return false; //No Ack, return False + + p1=i2c->read(1); //Tobj low byte + p2=i2c->read(1); //Tobj heigh byte + p3=i2c->read(0); //PEC + + i2c->stop(); //stop condition + + + temp_thermo=((((p2&0x007f)<<8)+p1)*0.02)-0.01; //degree centigrate conversion + *temp_val=temp_thermo-273; //Convert kelvin to degree Celsius + + return true; //load data successfully, return true +} \ No newline at end of file