Code-Bin #626

untitled Other Code
Posted by: Bill Gates | May 2, 2010 @ 6:28pm

Other Code

#include <PrintPJRClcd.h>

#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into port 2 on the Arduino
#define ONE_WIRE_BUS 2
#define RH_SENSOR_PIN 0
#define DEHUMIDIFIER_PIN 3
#define EXHAUST_PIN 4
#define RH_SWING 10
#define TEMP_SWING 6
#define MINIMUM_ON_TIME 10  //minumum amount of time the vent can be on, in minutes
int MaxRoomTemp = 90;
int MaxRoomRH = 60;

// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);

// Pass our oneWire reference to Dallas Temperature. 
DallasTemperature sensors(&oneWire);

PrintPJRClcd LCD = PrintPJRClcd();

float IndoorTemperature = 0.0;
int IndoorRH = 0;
int VentActivated = 0;
unsigned long TurnOffOutletIn = 0;
unsigned long tempMillis = 0;
boolean HeatTriggered = false;
boolean RHTriggered = false;

void setup(void)
{
  // start serial port
  Serial.begin(19200);
  // Start up the OneWire library
  sensors.begin();
	
  LCD.RedrawScreen(); //blank screen

/* Turn on output pins for dehumidifier and exhaust fan */
  pinMode( DEHUMIDIFIER_PIN, OUTPUT );
  pinMode( EXHAUST_PIN, OUTPUT );
  digitalWrite( DEHUMIDIFIER_PIN, LOW);
  digitalWrite( EXHAUST_PIN, LOW);

}

void loop(void)
{ 
  // call sensors.requestTemperatures() to issue a global temperature request
  sensors.requestTemperatures(); // Send the command to get temperatures
  IndoorTemperature = sensors.getTempFByIndex(0);  //assign first temp
  IndoorRH = map(analogRead(RH_SENSOR_PIN), 196, 822, 0, 100);

if (IndoorRH > MaxRoomRH) { // Check RH
    activateVent();
  }
  if (IndoorTemperature > MaxRoomTemp) { //check temp
    activateVent();
  }

tempMillis = millis();
/* if (vent is on) && (Current temp is less than max temp - swing) && (enough time has passed) */
  if ( (HeatTriggered) && ( VentActivated == 1 ) && ( int(IndoorTemperature) <= (MaxRoomTemp - TEMP_SWING ) ) && ( tempMillis > TurnOffOutletIn ) ) { deactivateVent(); };
  if ( (RHTriggered) && ( VentActivated == 1 ) && ( int(IndoorRH) <= (MaxRoomRH - RH_SWING ) ) && ( tempMillis > TurnOffOutletIn ) ) { deactivateVent(); };

LCD.PrintData(0,0,IndoorTemperature);
  LCD.PrintData(1,IndoorRH,0);
  LCD.PrintData(2,MaxRoomRH,MaxRoomTemp);
  LCD.PrintData(3,int(VentActivated),0);
  
  
  
}

void deactivateVent(void){ 
VentActivated = 0; //turn off flag
	digitalWrite(EXHAUST_PIN, LOW);
}
void activateVent(void) {
VentActivated = 1; //turn on flag
digitalWrite(EXHAUST_PIN, HIGH);
TurnOffOutletIn = millis() + (MINIMUM_ON_TIME * 60000);
}

/*  Analog input, HIH-4030, an RH sensor with a linear output
 *	
 *	Zero offset +0.958 V,                          Analog reading
 *	.958 volts == 0% humidity          ==  196
 *	3.268 volts == 75.3% RH            ==  669
 *	4.018 volts == 100% RH             ==  822
 *	slope 30.680 mV/% RH , 3060+958
 *	RH = (Vout - 0.958)/0.0307
 *	Accuracy +/- 3.5%
 *	+/-  0.5% Repeatability
 *	
 *	USE ONLY IN NON-CONDENSING ENVIRONMENTS
 *	When liquid water falls on the humidity sensor die, 
 *	output goes to a low rail condition indicating no humidity.	
 *	
 *	map(analogRead(RH_SENSOR_PIN), 196, 822, 0, 100) means:
 *	(RawValueFromPin,ZeroReading,100%Reading,0,100)
 *	It converts the reading on the pin to a percentage.
 *	
 ********/

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