My arduino cyl head temp display, almost got it ! Options

[underthetire]

My very first Arduino micro controller program. I've never used the Arduino language before ( think it c or C+ ? ) anyways, took me a few hours. Still need to order the thermocouple conversion chips, but looks like it will work. You can see when I put my finger over the analog pins, it does change as it should. Total cost will still be less than a single channel VDO gauge, and I will be able to calibrate it for more accurate readings.


https://www.youtube.com/watch?v=9UOUeEh11eg

[underthetire]

i'll put some more notes in it when I clean it up, but here it is..got a arduino and LCD shield on ebay, with shipping it was like 30 bucks total.

CODE

/*
  
  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
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
  */

// include the library code:
#include <LiquidCrystal.h>
void setup()
{
  Serial.begin(19200);
  Serial.println("Start");
}
void loop()

{
   label:;
  int raw = analogRead(1);
  int celsius = ( 5.0 * raw * 100.0) / 1024.0;

  Serial.print("Celsius: ");
  Serial.println(celsius);

  int fahrenheit = (((celsius * 9) / 5) + 32);
  Serial.print("Fahrenheit: ");
  Serial.println(fahrenheit);
  
  int raw1 = analogRead(2);
  int celsius1 = ( 5.0 * raw1 * 100.0) / 1024.0;

  Serial.print("Celsius1: ");
  Serial.println(celsius1);

  int fahrenheit1 = (((celsius1 * 9) / 5) + 32);
  Serial.print("Fahrenheit1: ");
  Serial.println(fahrenheit1);

int raw2 = analogRead(3);
  int celsius2 = ( 5.0 * raw2 * 100.0) / 1024.0;

  Serial.print("Celsius2: ");
  Serial.println(celsius2);

  int fahrenheit2 = (((celsius2 * 9) / 5) + 32);
  Serial.print("Fahrenheit2: ");
  Serial.println(fahrenheit2);
  
   int raw3 = analogRead(4);
  int celsius3 = ( 5.0 * raw2 * 100.0) / 1024.0;

  Serial.print("Celsius3: ");
  Serial.println(celsius3);

  int fahrenheit3 = (((celsius3 * 9) / 5) + 32);
  Serial.print("Fahrenheit3: ");
  Serial.println(fahrenheit3);
  
  int warning =13;
  pinMode(warning, OUTPUT);
  
  int backlightc = 10;
  pinMode(backlightc, OUTPUT);
  digitalWrite(backlightc,HIGH);
  delay(100);


// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
const int numRows = 2;
const int numCols = 16;
//void setup() {
  // set up the LCD's number of rows and columns:

  lcd.begin(0, 2);
  // Print a message to the LCD.
  lcd.print("Cyl. 1 temp ");
  lcd.setCursor(12,0);
  lcd.print( fahrenheit);
  lcd.print( "F");
  lcd.setCursor(0, 1);
  if (fahrenheit >400) digitalWrite(warning, HIGH);
  if (fahrenheit >400) delay (10000);
  lcd.print("Cyl. 2 temp ");
  lcd.setCursor(12,1);
  lcd.print(fahrenheit1);
  lcd.print("F");
  if (fahrenheit1 >400) digitalWrite(warning, HIGH);
  if (fahrenheit1 >400) delay (10000);
  delay (3000);
  lcd.setCursor(0, 0);
  lcd.print("Cyl. 3 temp ");
  lcd.setCursor(12,0);
  lcd.print(fahrenheit2);
  lcd.print("F");
  if (fahrenheit2 >400) digitalWrite(warning, HIGH);
  if (fahrenheit2 >400) delay (10000);
  lcd.setCursor(0, 1);
  lcd.print("Cyl. 4 temp ");
  lcd.setCursor(12,1);
  lcd.print(fahrenheit3);
  lcd.print("F");
  if (fahrenheit3 >400) digitalWrite(warning, HIGH);
  if (fahrenheit3 >400) delay (10000);
  delay(3000);
  if (fahrenheit <400) digitalWrite(warning, LOW);
  if (fahrenheit1 <400) digitalWrite(warning, LOW);
  if (fahrenheit2 <400) digitalWrite(warning, LOW);
  if (fahrenheit3 <400) digitalWrite(warning, LOW);
  goto label;
}