Temp Humidity Printer

TempHumidityPrinter.pde

/*
    TempHumidityPrinter

   (c) Colin Faulkingham 2011 - MIT license  
    
    Sparkfun Thermal Printer http://www.sparkfun.com/products/10438
    Adafruit DHT11 Temp and Humidy Sensor https://www.adafruit.com/products/386
    Sparkfun 16x2 LCD display http://www.sparkfun.com/products/9761
    Arduino UNO SMD http://www.sparkfun.com/products/10356
  
*/


#include <LiquidCrystal.h>
#include <NewSoftSerial.h>
#include "DHT.h"

// PIN FOR TEMP sensor.
#define DHTPIN 6
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

// Setup for the Thermal Printer
#define FALSE  0
#define TRUE  1
NewSoftSerial Thermal(8,9);
// initialize the library with the numbers of the interface pins

int printOnBlack = FALSE;
int printUpSideDown = FALSE;

int ledPin = 13;
int heatTime = 255; //80 is default from page 23 of datasheet. Controls speed of printing and darkness
int heatInterval = 255; //2 is default from page 23 of datasheet. Controls speed of printing and darkness
char printDensity = 15; //Not sure what the defaut is. Testing shows the max helps darken text. From page 23.
char printBreakTime = 15; //Not sure what the defaut is. Testing shows the max helps darken text. From page 23.

// Setup for the 16x2 LCD
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);


void setup() {
  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  // Print a message to the LCD.
  //lcd.print("Temp and Humidity");
  Serial.begin(9600); 
  Serial.println("DHTxx test!");
  
  Thermal.begin(19200); //Setup soft serial for ThermalPrinter control

  printOnBlack = FALSE;
  printUpSideDown = FALSE;

  //Modify the print speed and heat
  Thermal.print(27, BYTE);
  Thermal.print(55, BYTE);
  Thermal.print(7, BYTE); //Default 64 dots = 8*('7'+1)
  Thermal.print(heatTime, BYTE); //Default 80 or 800us
  Thermal.print(heatInterval, BYTE); //Default 2 or 20us

  //Modify the print density and timeout
  Thermal.print(18, BYTE);
  Thermal.print(35, BYTE);
  int printSetting = (printDensity<<4) | printBreakTime;
  Thermal.print(printSetting, BYTE); //Combination of printDensity and printBreakTime

  
  
  
  
  dht.begin();
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0,0);
  // print the number of seconds since reset:
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  //char st = strcat("H: ",h," Temp: ",t);
  lcd.print("Humidity: ");
  lcd.print(h);
  lcd.setCursor(0,1);
  lcd.print("Temp: ");
  
  float temp =  1.8 * t + 32;
  lcd.print(temp);

   Serial.print("Humidity: "); 
   Serial.print(h);
   Serial.print(" %\t");
   Serial.print("Temperature: "); 
   Serial.print(temp);
   Serial.print("BLAH: ");
   Serial.print(t);
   Serial.println(" *C");
   char option;
    while(1) {
      while(!Serial.available());
      option = Serial.read();
      if(isalnum(option)) break;
    }
   if(option == '1') {
     Thermal.print("Humidity: "); 
     Thermal.print(h);
     Thermal.print(" %\t");
     Thermal.print(10, BYTE);
     Thermal.print("Temperature: "); 
     Thermal.print(temp);
     Thermal.print(10, BYTE);
     Thermal.print(10, BYTE);
     Thermal.print(10, BYTE);
     //Thermal.print("BLAH: ");
     //Thermal.print(t);
     //Thermal.println(" *C");
     //Thermal.print(10, BYTE); 
   }
   else {
      Serial.print("Choice = ");
      Serial.println(option, DEC);
    }
}