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Noobie to arduino need help with incubator project

mk1manno

Hey all im new to the site and to arduinos any help would be appreciated. Im building a incubator for incubating chicken egg just for the experience of setting up and programing. So far I have arduino uno with a dht22 temp/humidity I am planning on using a 55watt car bulb for heater (maybe two if I need them) a servo motor to tilt the bed every six hours (egg need to be turned every six hours to develop correctly). I have designed and printed a egg bed to hold 9 eggs and fittings to attach bed to servo motor. I have pc power supply converted to power bulb. Now im going to try to control 55 watt bulb with pwm from arduino to hold temp at 32 degrees c or some temp close depending on eggs im incubating. I have got mosfet (fqp30n06l) to control bulb.

 

My questions at this point are:

1. Is this the best way to approach this project (I do want to learn to use pwm from input from temp sensor).

2. What wiring circuit is correct for mosfet (Can I just use it direct).

3. I have put the 12volt pc power supply ground into arduino ground is this ok(correct way of doing it).

4. For timer to turn bed every six hours will I need something like a real time clock.

5. How do I use all the code together on arduino can I write them on different tabs

6. Any help with code would be a big help but please explain what is happening with comments as I do want to learn wats happening please.

 

Thanks in advance for any input.

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  • 0

    Hey all

     

    trying to get pid working in this using dht22 but cant get it to work any input heres my code

     

    // Example testing sketch for various DHT humidity/temperature sensors
    // Written by ladyada, public domain

    #include "DHT.h"
    #include <PID_v1.h>

    #define DHTPIN 12     // what pin we're connected to

    // Uncomment whatever type you're using!
    //#define DHTTYPE DHT11   // DHT 11
    #define DHTTYPE DHT22   // DHT 22  (AM2302)
    //#define DHTTYPE DHT21   // DHT 21 (AM2301)

    // Connect pin 1 (on the left) of the sensor to +5V
    // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
    // to 3.3V instead of 5V!
    // Connect pin 2 of the sensor to whatever your DHTPIN is
    // Connect pin 4 (on the right) of the sensor to GROUND
    // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

    // Initialize DHT sensor for normal 16mhz Arduino
    DHT dht(DHTPIN, DHTTYPE);
    // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you
    // might need to increase the threshold for cycle counts considered a 1 or 0.
    // You can do this by passing a 3rd parameter for this threshold.  It's a bit
    // of fiddling to find the right value, but in general the faster the CPU the
    // higher the value.  The default for a 16mhz AVR is a value of 6.  For an
    // Arduino Due that runs at 84mhz a value of 30 works.
    // Example to initialize DHT sensor for Arduino Due:
    //DHT dht(DHTPIN, DHTTYPE, 30);


    int heater = 3;

    //Define Variables we'll be connecting to
    double Setpoint, Input, Output,t;

    //Specify the links and initial tuning parameters
    PID myPID(&Input, &Output, &Setpoint,2,3,0, DIRECT);


    void setup() {
      Serial.begin(9600);
      Serial.println("DHTxx test!");

      dht.begin();
    // from here is heater control.
       pinMode (heater, OUTPUT);
      
        //initialize the variables we're linked to
      Input = t;
      Setpoint = 24.0;

      //turn the PID on
      myPID.SetMode(AUTOMATIC);

      
    }

    void loop() {
     
    // Wait a few seconds between measurements.
      delay(2000);

      // Reading temperature or humidity takes about 250 milliseconds!
      // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
      float h = dht.readHumidity();
      // Read temperature as Celsius
      float t = dht.readTemperature();
      // Read temperature as Fahrenheit
      float f = dht.readTemperature(true);
     
      // Check if any reads failed and exit early (to try again).
      if (isnan(h) || isnan(t) || isnan(f)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
      }

      // Compute heat index
      // Must send in temp in Fahrenheit!
      float hi = dht.computeHeatIndex(f, h);

      Serial.print("Humidity: ");
      Serial.print(h);
      Serial.print(" %\t");
      Serial.print("Temperature: ");
      Serial.print(t);
      Serial.print(" *C ");
      Serial.print(f);
      Serial.print(" *F\t");
      Serial.print("Heat index: ");
      Serial.print(hi);
      Serial.println(" *F");
     
    //from here is heater control.
    //analogWrite(heater, 100);

    //if (t <= 31)
    //     {analogWrite(heater, 254);}
         
    //else if (t >= 33)
             // {analogWrite(heater, 20);}
             
    //else {analogWrite(heater, 100);}
         
       
      myPID.Compute();
      analogWrite(heater,Output); 
     
    }

Reply
  • 0

    Hey all

     

    trying to get pid working in this using dht22 but cant get it to work any input heres my code

     

    // Example testing sketch for various DHT humidity/temperature sensors
    // Written by ladyada, public domain

    #include "DHT.h"
    #include <PID_v1.h>

    #define DHTPIN 12     // what pin we're connected to

    // Uncomment whatever type you're using!
    //#define DHTTYPE DHT11   // DHT 11
    #define DHTTYPE DHT22   // DHT 22  (AM2302)
    //#define DHTTYPE DHT21   // DHT 21 (AM2301)

    // Connect pin 1 (on the left) of the sensor to +5V
    // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
    // to 3.3V instead of 5V!
    // Connect pin 2 of the sensor to whatever your DHTPIN is
    // Connect pin 4 (on the right) of the sensor to GROUND
    // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

    // Initialize DHT sensor for normal 16mhz Arduino
    DHT dht(DHTPIN, DHTTYPE);
    // NOTE: For working with a faster chip, like an Arduino Due or Teensy, you
    // might need to increase the threshold for cycle counts considered a 1 or 0.
    // You can do this by passing a 3rd parameter for this threshold.  It's a bit
    // of fiddling to find the right value, but in general the faster the CPU the
    // higher the value.  The default for a 16mhz AVR is a value of 6.  For an
    // Arduino Due that runs at 84mhz a value of 30 works.
    // Example to initialize DHT sensor for Arduino Due:
    //DHT dht(DHTPIN, DHTTYPE, 30);


    int heater = 3;

    //Define Variables we'll be connecting to
    double Setpoint, Input, Output,t;

    //Specify the links and initial tuning parameters
    PID myPID(&Input, &Output, &Setpoint,2,3,0, DIRECT);


    void setup() {
      Serial.begin(9600);
      Serial.println("DHTxx test!");

      dht.begin();
    // from here is heater control.
       pinMode (heater, OUTPUT);
      
        //initialize the variables we're linked to
      Input = t;
      Setpoint = 24.0;

      //turn the PID on
      myPID.SetMode(AUTOMATIC);

      
    }

    void loop() {
     
    // Wait a few seconds between measurements.
      delay(2000);

      // Reading temperature or humidity takes about 250 milliseconds!
      // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
      float h = dht.readHumidity();
      // Read temperature as Celsius
      float t = dht.readTemperature();
      // Read temperature as Fahrenheit
      float f = dht.readTemperature(true);
     
      // Check if any reads failed and exit early (to try again).
      if (isnan(h) || isnan(t) || isnan(f)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
      }

      // Compute heat index
      // Must send in temp in Fahrenheit!
      float hi = dht.computeHeatIndex(f, h);

      Serial.print("Humidity: ");
      Serial.print(h);
      Serial.print(" %\t");
      Serial.print("Temperature: ");
      Serial.print(t);
      Serial.print(" *C ");
      Serial.print(f);
      Serial.print(" *F\t");
      Serial.print("Heat index: ");
      Serial.print(hi);
      Serial.println(" *F");
     
    //from here is heater control.
    //analogWrite(heater, 100);

    //if (t <= 31)
    //     {analogWrite(heater, 254);}
         
    //else if (t >= 33)
             // {analogWrite(heater, 20);}
             
    //else {analogWrite(heater, 100);}
         
       
      myPID.Compute();
      analogWrite(heater,Output); 
     
    }

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