Lüftersteuerung

  1/********************************************************
  2** Fan-Controll                                        
  3** Download from: http://wissensdurst.homeip.net
  4*********************************************************
  5** Reads temperature value from sensor
  6** Optinal setting the switching level with a potentiometer
  7** If the temperature rises over the switching level, 
  8**    turns on the power supply and fans 1-3 
  9** Under the switching level turns the power supply and fans off
 10** Display actual temperature value all the time
 11*********************************************************/
 12#include <AH_74HC595.h>
 13#include <DallasTemperature.h>
 14#define FAN_PIN3 13
 15#define FAN_PIN2 12
 16#define FAN_PIN1 11
 17#define PWR_ON 10
 18#define ONE_WIRE_BUS 9
 19#define LED1 5
 20#define POTI 1
 21#define DEFAULT_TEMP 20
 22
 23// Setup a oneWire instance to communicate with any OneWire devices
 24OneWire oneWire(ONE_WIRE_BUS);
 25
 26// Pass our oneWire reference to Dallas Temperature.
 27DallasTemperature sensors(&oneWire);
 28/*
 29#define SER_Pin   4   //Serial data input
 30#define RCLK_Pin  3   //Register clock
 31#define SRCLK_Pin 2   //Shift register clock
 32*/
 33
 34DeviceAddress term1 = { 0x28, 0x2C, 0x79, 0x09, 0x04, 0x00, 0x00, 0x46 };
 35static byte sollTemp=DEFAULT_TEMP;
 36const static byte hysterese=40;
 37static boolean fan_old=false;
 38static boolean editMode=false;
 39static unsigned long timer[2];
 40static boolean timerState[3];
 41static int potiVal_last=0;
 42
 43//Initialisation
 44//AH_74HC595 seven_segment1(SER_Pin, RCLK_Pin, SRCLK_Pin);
 45AH_74HC595 seven_segment1(4, 3, 2, true);
 46AH_74HC595 seven_segment2(8, 7, 6, true);
 47
 48// Timer - Functions -----------------------
 49// taken from: <a href="http://arduino.cc/playground/Code/DelaySeconds">http://arduino.cc/playground/Code/DelaySeconds</a>
 50int delayMilliSeconds(int timerNumber,unsigned long delaytime){
 51  unsigned long timeTaken;
 52  if (timerState[timerNumber]==0){
 53    timer[timerNumber]=millis();
 54    timerState[timerNumber]=1;
 55  }
 56  if (millis()> timer[timerNumber]){
 57    timeTaken=millis()+1-timer[timerNumber];
 58  }else{
 59    timeTaken=millis()+2+(4294967295-timer[timerNumber]);
 60  }
 61  if (timeTaken>=delaytime) {
 62    timerState[timerNumber]=0;
 63    return 1; 
 64  }else{
 65    return 0;
 66  }
 67}// -----------------------------------------
 68
 69void displayNumber(byte nr) {
 70  // divide the value in two peaces and show them
 71  byte stelleX = nr % 10;;
 72  seven_segment1.showNumber(stelleX);
 73  stelleX = nr / 10;
 74  seven_segment2.showNumber(stelleX);
 75}
 76
 77void setup(){
 78  pinMode(FAN_PIN1, OUTPUT);
 79  pinMode(FAN_PIN2, OUTPUT);
 80  pinMode(FAN_PIN3, OUTPUT);
 81  digitalWrite(FAN_PIN1, LOW);
 82  digitalWrite(FAN_PIN2, LOW);
 83  digitalWrite(FAN_PIN3, LOW);
 84  pinMode(LED1, OUTPUT);
 85  pinMode(PWR_ON, OUTPUT);
 86  digitalWrite(PWR_ON, HIGH);
 87  digitalWrite(2, LOW);
 88  digitalWrite(4, LOW);
 89  digitalWrite(6, LOW);
 90  digitalWrite(7, LOW);
 91  digitalWrite(8, LOW);
 92  seven_segment1.clear();
 93  seven_segment2.clear();
 94  sensors.begin();
 95  // set the resolution to 12 bit
 96  sensors.setResolution(term1, 12);
 97  // timer reset
 98  timerState[0] = 0;
 99  timerState[1] = 0;
100}
101
102void loop(){
103  // Read Poti value and map it
104  delay(100);
105  int potiVal = analogRead(POTI);
106  // if no poti found use 23 grad celsius as default
107  if ( potiVal < 1010 ) {
108    sollTemp = map(potiVal, 0, 1023, 10, 35);
109    // set Editmode
110    if ( potiVal_last != potiVal  ) {
111      // avoid jumping values
112      int v_min=potiVal-hysterese; 
113      int v_max=potiVal+hysterese;
114      if( (potiVal_last>v_max)||(potiVal_last<v_min) ) {
115        editMode = true;
116        potiVal_last = potiVal;
117        // reset Timer
118        timerState[1]=0;
119      }
120    }
121  }else{
122    sollTemp=DEFAULT_TEMP;
123  }
124
125  if ( editMode == true  ) {
126    if (delayMilliSeconds(1,3000)) {
127      // leave editmode if 5 seconds nothing happens
128      editMode = false;
129    }else{
130      // show sollWert
131      displayNumber(sollTemp);
132    }
133  }
134
135  // wait for the slow sensor
136  if (delayMilliSeconds(0,10000)){
137    // Request temperature
138    sensors.requestTemperatures();
139    // get the value
140    byte tempC = sensors.getTempC(term1);
141    if (tempC < -100) {
142      // show the fail of the sensor
143      seven_segment1.showNumber(15);
144      seven_segment2.showNumber(15);
145      // default turn the fans on
146      fan_now = true;
147    }else{
148      if ( editMode == false  ) {
149        displayNumber(tempC);
150      }
151      if ( tempC > sollTemp  ) {
152        // its hot, turn fans on
153        fan_now = true;
154      }else{
155        // debounce jumping value
156        if ( fan_now == true  ) {
157          if ( tempC > (sollTemp - 1)  ) {
158            fan_now = true;
159          }else{
160            fan_now = false;
161          }
162        }
163      }
164    }
165  }
166
167  // do the action, if neccessary
168  if ( fan_now != fan_old  ) {
169    if (fan_now) {
170      // turn power supply on
171      digitalWrite(PWR_ON, LOW);
172      // wait for stabilized power supply
173      delay(3000);
174    }else{
175      // turn power supply off
176      digitalWrite(PWR_ON, HIGH);
177    }
178    digitalWrite(FAN_PIN1, fan_now);
179    digitalWrite(FAN_PIN2, fan_now);
180    digitalWrite(FAN_PIN3, fan_now);
181    digitalWrite(LED1, fan_now);
182    fan_old = fan_now;
183  }
184}