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PIDHeater82
Dependencies: PID mbed millis ttmath
Fork of PIDHeater by
main.cpp
- Committer:
- Cedricbts
- Date:
- 2017-06-23
- Revision:
- 3:00a491d8ed0c
- Parent:
- 2:6e731a17523c
File content as of revision 3:00a491d8ed0c:
/* +3.3v | \ / 10k Résistance série \ / | .-----------O Vers Anolog 0 de la carte | \ / Thermistance 10k Nominal \ / | --- GND * * Author(s): Michael Ball unix_guru@hotmail.com * */ #include "mbed.h" #include "millis.h" #include "PID.h" float getTemperature(); Serial pc(USBTX, USBRX); Ticker PrintTicker; // Send process results to Console once per second Ticker ticker; // Set up the millis() ticker. #define DEFAULT_Kp 100 #define DEFAULT_Ki 0 #define DEFAULT_Kd 0 #define AUTOMATIC 1 #define MANUAL 0 #define DIRECT 0 #define REVERSE 1 #define thermistor A0 // Analog input pin A0 #define driver PB_3 // PWM output pin PB_3 #define PERIOD 2.0 AnalogIn Thermistor(thermistor); // Read temperature value from thermistor on A0 PwmOut Driver(PB_3); // PWM drive values are 0-1.0 // For 0-100% float temp; float Input, Output, Setpoint; PID controller(&Input, &Output, &Setpoint, DEFAULT_Kp , DEFAULT_Ki , DEFAULT_Kd , DIRECT); #define RATE 2.0 // Print rate once every two seconds void PrintValues() { // Routine to print out results to console pc.printf("Input Output Setpoint Kp Ki Kd time\r\n"); pc.printf("%f, %f, %f, %f, %f, %f, %d \r\n", Input, Output, Setpoint, controller.GetKp() , controller.GetKi() , controller.GetKd() , millis() ); } int main(){ startMillis(); // Initialize timer. pc.baud(9600); //pc.printf("\r\nThermistor PID Test - Build " __DATE__ " " __TIME__ "\r\n"); PrintTicker.attach(&PrintValues,RATE); // Start PID process running at 2s rate. controller.SetSampleTime(2000); Setpoint = 24; // Set target temperature in degrees Celcius. controller.SetMode(AUTOMATIC); // Turn PID controller on. while(1){ Input = getTemperature(); // Actual temperature in Degrees Celcius controller.Compute(); // Process PID loop. Driver = Output/1000; // Sent PWM value scaled 0 - 1.0 as mbed requires } } float getTemperature() { float h = Thermistor.read_u16(); h = (h/65536)*3.3; //Conversion Bit to Voltage pc.printf("voltage %f\r\n", h); temp = -30.705*h+91.788; //Converson Voltage to °C pc.printf("temp = %f\r\n",temp); return temp; }