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CPUregulator.cpp

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+#include <iostream>
+#include <csignal>
+#ifdef __arm__
+    #define RPI
+    #include <wiringPi.h>
+#endif
+
+using namespace std;
+
+/*
+	- shell cmd: /opt/vc/bin/vcgencmd measure_temp
+	- shell cmd; cat /sys/class/thermal/thermal_zone0/temp 
+*/
+//Globals
+const int sleepTime = 2500; //In milliseconds [>=2500]
+const float coolingTemp = 35.1; //Temperature when start cooling
+const int fan_control_pin = 3; // Wiring pi pin
+const int controlMode = 3; 
+/* 
+    1 == temp < coolingTemp //when temp > coolingTemp start cooling until temp < coolingTemp
+    2 == temp < coolingTemp && count > minCycles  // 10 times serial temp must be low to turn off
+    3 == coolingTemp - temp > minDifferenceTemp   //when temp > coolingTemp cools until coolingTemp - temp > minDifferenceTemp
+*/
+const int minCycles = 10; 
+const float minDifferenceTemp = 4.0; // degres C
+
+bool debugMode = false; //Turn output
+
+bool P_TERMINATE = false;
+bool fan_status = false;
+int count = 0;
+bool startCount = false;
+//Prototype
+void terminate_program(int sig);
+void fanOn();
+void fanOff();
+
+int main(int argc,char* argv[])
+{
+    //Check mode
+    if(controlMode>3||controlMode<1)
+        return -1;
+    //Proces args
+    for(int i=0;i<argc;i++)
+    {
+        if(i>0&& argv[i]=="-d")
+            debugMode = true;
+    }
+
+	//Init
+    signal(SIGINT,terminate_program); //Interupt handle
+    #ifdef RPI
+        wiringPiSetup();
+        pinMode(fan_control_pin,OUTPUT);
+        digitalWrite(fan_control_pin,LOW);
+    #endif
+    //Core stage
+    FILE *file;
+	double T;
+    float temp;
+	float lastTemp = 0;
+    if(debugMode)
+        cout << "Start monitoring temperature of CPU" << endl;
+	while(!P_TERMINATE)
+    {
+        //Open file
+        file = fopen ("/sys/class/thermal/thermal_zone0/temp", "r");
+        if (file == NULL)
+            continue;
+
+        //Process
+        T = 0;
+        temp = 0;    
+        fscanf (file, "%lf", &T);
+        temp = ((float)T)/1000;
+
+        if(debugMode&&lastTemp!=temp) //DEBUG ->
+        {    
+            printf ("The temperature is %6.3f C.\n", temp);
+            lastTemp = temp;
+        }
+
+        //Close opened file
+        fclose (file);
+
+
+        if((controlMode==1&&temp > coolingTemp)||(controlMode==2&&temp>coolingTemp)||(controlMode==3&&temp>coolingTemp))
+        {   
+            //Cooling needed
+
+            if((count<=0&&controlMode==2)||(controlMode!=2))
+            {    
+                fanOn();
+                if(controlMode==2)
+                    startCount = true;
+            }
+            if(startCount&&count>0)
+                count = 0;
+        }
+        else 
+        {
+            //Stop cooling
+
+            if(controlMode==2)
+            {
+                if(startCount)
+                    count ++;
+                if(count >= minCycles)
+                {
+                    count = 0;
+                    fanOff();
+                    startCount = false;
+                }
+            }
+            else if(controlMode==3)
+            {
+                if(coolingTemp - temp > minDifferenceTemp)
+                {
+                        fanOff();
+                }
+            }
+            else if(controlMode == 1)
+            {
+                if(temp < coolingTemp)
+                {
+                    fanOff();
+                }
+
+            }
+        }
+
+        if(!P_TERMINATE) //Dont sleep if interrupted
+            delay(sleepTime);
+
+    }
+	#ifdef RPI
+        digitalWrite(fan_control_pin,LOW);
+    #endif
+    if(debugMode)
+        cout << "Monitoring stoped" << endl;
+
+	return 0;
+}
+
+
+void terminate_program(int sig)
+{
+	P_TERMINATE = true;
+}
+
+void fanOn()
+{
+    if(fan_status==false) //Turn on fan
+    {
+        #ifdef RPI
+            digitalWrite(fan_control_pin,HIGH);
+        #endif
+        if(debugMode)
+            cout << "On" << endl;
+        fan_status = true;
+    }
+}
+void fanOff()
+{
+    if(fan_status==true) //Turn off FAN
+    {
+        #ifdef RPI
+            digitalWrite(fan_control_pin,LOW);
+        #endif
+        if(debugMode)
+            cout << "Off" << endl;
+        fan_status = false;
+    }
+}

Makefile

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+#DO NOT CHANGE FILE
+M_ARCH := $(shell g++ -dumpmachine | awk '{split($$1,a,"-");print a[1]}')
+#VARIABLES
+CC=g++
+CC-RPI=g++-4.9
+
+CFLAGS=-std=c++11
+#Files
+CORE=CPUregulator.cpp
+
+LIBRARYS=-lwiringPi
+#Main compile
+all:
+	@echo "You have chosen wrong option"
+compile:$(CORE) 
+	@echo "Compiling Core !!!"
+	@$(CC) $(CFLAGS) *.o $(CORE) -o RPiFC  $(LIB)
+	@echo "Done"
+compile-rpi:
+	@$(MAKE) compile CC='$(CC-RPI)' LIB='$(LIBRARYS)' --no-print-directory
+install: install-wiringpi compile
+    @echo "Done"
+    #TODO move program to other folder and set autorun
+
+#other options	
+run:RPiFC 
+	@sudo ./RPiFC
+debug:RPiFC
+	@sudo ./RPiFC -d
+clean:
+	@rm RPiFC
+	@echo "Cleaned"
+
+
+#Installations
+install-wiringpi:
+    @echo "Installing wiringpi"
+	git clone git://git.drogon.net/wiringPi
+	cd wiringPi&&./build
+    @echo "Done"