/*
  LiquidCrystal library with DRobotics shield.
  
 
Pins configured with DRobotics LCD shield.
http://www.droboticsonline.com/index.php/review/product/list/id/7/
Example circuit for printing temperature from an LM34. 
 
 The circuit:
 * LCD RS pin to digital pin 8
 * LCD Enable pin to digital pin 9
 * LCD D4 pin to digital pin 4
 * LCD D5 pin to digital pin 5
 * LCD D6 pin to digital pin 6
 * LCD D7 pin to digital pin 7
 
 LM34 into +5V, GND
 Middle pin to Analog pin 1 (Analog 0 is used by the DRobotics shield)
 
 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe 
 modified 25 July 2009
 by David A. Mellis
 modified 15 Mar 2010
 by Tim Gibbon
 
 Modified from
 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1235965293
 
 */

// include the library code:
#include <LiquidCrystal.h>
int sensor_pin = 1;        // the analog pin for LM34 temp sensor - Cannot use pin 0 as it is used for something by DRobotics LCD shield
float sensor_reading = 0.0;        // variable to store the value coming from the sensor
float vref = 1.084;        // variable to store the voltage reference used (check for validity with a DMM)
int fahrenheit = 0;        // variable to store the actual temperature
int acquisition_timer = 1000;        // variable to control the time between updates (in ms)
int centigrade = 0;
int loop_counter = 0;

// initialize the library with the numbers of the interface pins - suitable for DRobotics LCD Keypad shield
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

void setup() {
  // set up the LCD's number of columns and rows: 
  lcd.begin(16,2);
  pinMode( sensor_pin, INPUT );        // set LM34 temp sensor pin as an input
  analogReference(INTERNAL);        // set the analog reference to the 1.1V internal reference
  delay(1000);

}

void loop() {
  
  sensor_reading = analogRead(sensor_pin);         // stores the digitized (0 - 1023) analog reading from the LM34
  fahrenheit = (100.0 * sensor_reading * vref)/1023;   // calculates the actual fahrenheit temperature
  centigrade = (((5.0/9.0))*(fahrenheit-32.0)); //conversion to degrees C

  // set the cursor to (0,0):
  lcd.setCursor(0, 0);

   lcd.print("Temp=");
   lcd.print(centigrade);
   lcd.print("C");
   //Print useful counter on the second row

   lcd.setCursor(0,1);
   lcd.print(loop_counter);
   loop_counter++;
   delay(5000);
  // turn off automatic scrolling
  lcd.noAutoscroll();
  // clear screen for the next loop:
  lcd.clear();
}