Diff: main.cpp

Revision:

0:c9c80e03823a

diff -r 000000000000 -r c9c80e03823a main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jun 12 17:35:05 2015 +0000
@@ -0,0 +1,102 @@
+/* Libraries */
+#include "mbed.h"
+#include "TextLCD.h"
+
+/* */
+#define DELAY_M 50              //Delay before Measuring Voltage at ADC-Pin (TempNow)
+#define TEMP_BASEGAIN 0.137931  //Temp which should equal 1mV - changed by TEMP_FACTOR
+#define TEMP_OFFSET 0           //Offset of Temperature
+#define CTRL_GAIN 10            //TempDifference to PWM-Value Gain
+#define TEMP_FACTOR 1.5         //TEMP_BASEGAIN * TEMP_FACTOR = TEMP_GAIN
+
+/*  */
+Ticker dispRefresh;
+TextLCD lcd (p18, p16, p11, p10, p9, p8); // rs, e, d4-d7
+DigitalOut db5(p10);    //Data Pin 5 on LCD, used for Initialization
+DigitalOut rw(p17);     //Read-Write Pin on LCD: LOW-->WRITE
+PwmOut pHeat(p26);      //Heater-Pin 
+AnalogIn adc(p20);      //ADC-Pin 10Bit
+PwmOut pSpeaker(p25);   //Piezo-Speaker Pin
+InterruptIn rotSw1(p35); //Pin 1 of Rotary Encoder
+DigitalIn rotSw2(p33);   //Pin 2 of Rotary Encoder
+InterruptIn rotSwB(p30);   //Button of Rotary Encoder
+DigitalOut tempCtrlLED(LED1);
+
+/* */
+float TempNow = 0;      //Current Temperature Reading
+float TempSet = 200;      //Set Temperature   
+float pwmVal = 0;       //PWM-Value for Heater-Pin
+float adcVal = 0;       //Value of ADC-Reading
+
+/* */
+void writeLCD();
+void init4BitLCD();
+void readTemp();
+void calcPWM();
+void RotEnc();
+void RotBut();
+
+int ticker = 500;
+Ticker t;
+void tick_1(){
+    if(ticker > 0) ticker--;
+}
+
+int main() {
+    //Initialize
+    init4BitLCD();      //Set Display to 4 Bit-Mode
+    rw = 0;             // Set Read/Write Pin to Write
+    rotSw1.rise(&RotEnc);
+    rotSwB.rise(&RotBut);
+    pSpeaker.period_ms(2); //Set Speaker Frequency to 500Hz
+    //pHeat = 0.1;   
+    
+    t.attach(&tick_1, 0.001);
+    while(1) {
+        readTemp();     //Read Temperature              - Done
+        calcPWM();      //Calculate PWM-Value           - Done
+        pHeat = pwmVal; //Write PWM-Value to Heater     - Done
+        if(ticker == 0){
+            writeLCD();     //Write To LCD                  - Done
+            ticker = 500;
+        }
+        //Repeat
+    }
+}
+
+void RotBut()
+{tempCtrlLED = !tempCtrlLED;
+ if (pSpeaker == 0){pSpeaker = 0.5;}
+ else {pSpeaker = 0;}}
+ 
+void RotEnc()
+{
+    if (rotSw2 == 0){TempSet++;}
+    else if (rotSw2 == 1){TempSet--;}
+    wait_ms(1);
+    }
+
+void calcPWM()
+{
+    pwmVal = ((TempSet - TempNow) * CTRL_GAIN) / 255; //Calculate PWM-Val.
+    if (pwmVal > 1) pwmVal = 1;
+    else if (pwmVal < 0) pwmVal = 0;
+    }
+
+void readTemp()
+{   pHeat = 0;      //Switching Off Heater || Thermoelement --> No VoltageSupply
+    wait_ms(DELAY_M);   //Waiting for a bit|| Low-Pass Filter --> Ready State
+    adcVal = adc.read();    //Read ADC
+    TempNow = adcVal*3300*(TEMP_BASEGAIN * TEMP_FACTOR) + TEMP_OFFSET;   //Calculate current Temperature
+    pHeat = pwmVal;     //Re-Activate Heater Pin
+    }
+
+void writeLCD()
+{   char cHeat;
+    if(pwmVal > 0.5){cHeat = 'H';}
+    else{cHeat = ' ';}
+    lcd.cls();
+    lcd.printf("Set: %.0f C   %c\nNow: %.0f C", TempSet, cHeat, TempNow);}
+    
+void init4BitLCD()
+{   db5 = 1; wait_ms(1); lcd.cls();}
\ No newline at end of file