Heater for threaded program
Dependents: LEX_Threaded_Programming_V3
Heater.h
- Committer:
- omatthews
- Date:
- 2019-08-07
- Revision:
- 20:2d34a03ae57e
- Parent:
- 19:fccdd7127f94
- Child:
- 23:947850bbf325
File content as of revision 20:2d34a03ae57e:
/*------------------------------------------------------------------------------ Library header file for heater operations Date: 16/07/2018 ------------------------------------------------------------------------------*/ #ifndef Heater_H #define Heater_H #include "mbed.h" #include "ADS8568_ADC.h" #include "FastPWM.h" #define MEAS_DELAY 60 // measurement delay for ADC in us #define WAIT_DELAY 3 // wait delay for ADC in ms #define N_ROLL_AVG 1 // rolling average for R values #define ALL_CH 15 //value of convst bus to read all chanels simultaneosly #define Kp 0.2f //proportional gain #define Ti 0.5f //Integration time #define Kd 0.1f //Differentiator gain #define WIND_UP_LIMIT 0.1f //The change in error which turns off the integral term #define PWM_PERIOD 5 //Period of Pwm for the motor in us #define LOG_LIM 30 //Number of reads before the result is logged #define GUARD_PWM_RATIO 0.1 //Ratio of guard duty cycle to heater duty cycle class Heater { //This class provides the interface through which each heater can be controlled public: /** Constructor * @param i_port, the current port in the ADC * @param v_port, the voltage port in the ADC * @param * drive, a pointer to the heater drive * @param * guard, a pointer to the guard * @param * corr_grad, the gradient of the linear relationship between resistance and temperature * @param * corr_int, the intercept of the linear relationship between resistance and temperature * @param R_ref (default value 1), optional parameter sets the target value for R **/ Heater(const int i_port, const int v_port, FastPWM * drive, FastPWM * guard, const float corr_grad, const float corr_int, float R_ref = 1); //Public member functions void read(); //Updates the resistance and error values for the heater void hold(const int hold_time); //Holds R_ref for hold_time miliseconds void ramp_R(const int ramp_time, const float R_final, const float R_start); //Ramps for ramp_time miliseconds from R_start to R_final void ramp_T(const int ramp_time, const float T_final, const float T_start); //Same as above but with T (T is in degrees celcius) void output() const; //Prints the current state of the heater void turn_on(); //Turns the heater on void turn_off(); //Turns the heater off //Linear conversions between temperature and resistance. Note that temperature is always in celcius float R_to_T(const float R) const; float T_to_R(const float T) const; //Getters and setters void Set_T_ref(float T); void Set_R_ref(float R); void Set_D(float D); int Get_i() const; int Get_v() const; float Get_R() const; float Get_T() const; protected: int curr; //Latest current reading from ADC int v; //Latest voltage reading from ADC float R; //Latest resistance calculated from ADC current and voltage float R_ref; //Current referance for resistance float error; //R_ref - R //float error_diff; //Differential error float error_integrated; //Integrated error const int i_port; //ADC port which corresponds to current measurements const int v_port; //ADC port which corresponds to voltage measurements FastPWM * drive; //Pointer to the driver FastPWM * guard; //Pointer to the guard //Heater correlations give temperature for a given resistance (assume linear relationship) const float corr_grad; const float corr_int; }; #endif