Arduino LCD Timer

Hi All,

I am making a model rocket launch controller, it features a safety, Arm switch, a launch button, and a 16x2 LCD display. So to launch the rocket you Arm the Rocket by flipping the arming switch. Then you turn the saftey key, which is an electronic safety. A HIGH signal is passed through the key switch, which allows the rocket to launch. here is my current code.

#include <LiquidCrystal.h>
LiquidCrystal lcd(2,3,4,5,6,7);


//Define Booleans
boolean Armed = true;
boolean Safe = true;
boolean DeArmedTestPassed = false;
boolean HasLaunched = false;
boolean Launch = false;
//Define Pins
int ArmPin = 8;
int SafePin = 9;
int LaunchPin = 10;
int Piezo = 11;
int Igniter = 12;
int SwitchLed = 13;
int PotPin = 0;


char * erase = "                ";


int PotVal = 0;


void setup()
{
pinMode(ArmPin, INPUT);
pinMode(SafePin, INPUT);
pinMode(PotPin, INPUT);
pinMode(LaunchPin,INPUT);
Serial.begin(9600);
lcd.begin(16,2);




    for(int i = 0; i <= 2; i++)
      {
lcd.setCursor(0,0);
lcd.println("    Welcome To    ");
lcd.setCursor(0,1);
lcd.println(" Rocket Launch 1 ");
delay(1000);
lcd.setCursor(0,1);
lcd.println(erase);
lcd.setCursor(0,0);
lcd.println(erase);
delay(1000);
      }


lcd.clear();



   for(int j = 1; j  < 3; j++) // CHANGE ME
     {
    lcd.setCursor(0,0);
    lcd.print("   Loading      "); //10
    delay(500);
    lcd.setCursor(10,0);
    lcd.print(".");
    delay(500);
    lcd.setCursor(11,0);
    lcd.print(".");
    delay(500);
    lcd.setCursor(12,0);
    lcd.print(".");
    delay(500);
     }
lcd.clear();

if(digitalRead(ArmPin) == HIGH)
  DeArmedTestPassed = false;

else if(digitalRead(ArmPin) == LOW)
DeArmedTestPassed = true;

digitalWrite(13,LOW);
}


void loop()
{

  if(DeArmedTestPassed)
      {
    PotVal = (analogRead(PotPin), 0, 1023, 0, 120); //Figure me out
    lcd.setCursor(0,0);
    delay(100);
    if(digitalRead(ArmPin) == HIGH && !HasLaunched)
        Armed = true;
    else
        Armed = false;
    if(digitalRead(SafePin) == HIGH)
        Safe = true;
    else
        Safe = false;
        if(digitalRead(LaunchPin) == HIGH)
        Launch = true;
   
    if(Armed)
      {
        lcd.setCursor(0,0);
        lcd.print("Status    Armed ");
        delay(250);
        HasLaunched = false;
      }
    else
      {
        lcd.setCursor(0,0);
        lcd.print("Status  Un-Armed");
        delay(250);
      }
    if(Safe)
      {
         lcd.setCursor(10,1);
         lcd.print(" SAFE ");
      }
    else
      {
         lcd.setCursor(10,1);
         lcd.print("      ");
      }


    if(Armed && !Safe && !HasLaunched)
    {
     lcd.setCursor(9,1);
     lcd.print("LAUNCH");
     delay(150);
     lcd.setCursor(9,1);
     lcd.print("      ");
     delay(150);
    }
   
    lcd.setCursor(0,1);
    lcd.print("T 00:00");
     }


    else if(!DeArmedTestPassed)
      {
         lcd.setCursor(0,0);
         lcd.print("Please de-arm   ");
         lcd.setCursor(0,1);
         lcd.print("device & reset");
      }
      if(Armed && !Safe && !HasLaunched &&  Launch)
      {
       lcd.setCursor(8,1);
       lcd.print("LAUNCH!");
       digitalWrite(13, HIGH);
       delay(1500);
       digitalWrite(13, LOW);
       lcd.setCursor(8,1);
       lcd.print("        ");
       Launch = false;
       Armed = false;
       HasLaunched = true;
      }
}

So here is my problem. I will have a 10k pot. And as I turn it I want the time displayed(mock up at line 140) to increase to 2:00 when the pot is at max, and 00:05 at 0 pot. And once the system is unsafe and armed, you can initiate the launch. Once the launch is initiated it will count down and update the display to the new time every second. I have absolutely no idea how to set up the timer and display the decreasing time. I know I will have to use some form of a for loop. Bout it

Thanks Guys,

Austin

Top Replies

Parents

0 Former Member over 11 years ago

Hey Guys,

So I have found some code I believe will work, but I need to repurpose it for my LCD, since the original code uses a 7 Segment display.

int potPin = 0;
int seconds = 0;
int h = 0;




//Format Display #:## for greater than 60 seconds
    if (seconds >= 60){
      segment.drawColon(true);
      segment.writeDigitNum(0, 0);
      segment.writeDigitNum(1, (seconds/60)); //minutes
      segment.writeDigitNum(3, (seconds % 60)/10); //tens of seconds
      segment.writeDigitNum(4, (((seconds % 60) % 10))); //seconds
      segment.writeDisplay();
    }
   
    //Format Display ##.# for less than 60 seconds but greater than 10 seconds
    if (seconds >= 10 && seconds < 60) {
      segment.drawColon(false);
      segment.writeDigitNum(0, (seconds/10));
      segment.writeDigitNum(1, (seconds % 10), true);
      segment.writeDigitNum(3,0);
      segment.writeDigitNum(4,0);
      segment.writeDisplay();
    }
    //Format Display #.## for less than 10 seconds
    if (seconds < 10) {
      segment.drawColon(false);
      segment.writeDigitNum(0, 0);
      segment.writeDigitNum(1, seconds, true);
      segment.writeDigitNum(3,0);
      segment.writeDigitNum(4,0);
      segment.writeDisplay();
    }
   
   
     //segment.println(seconds);
    //segment.writeDisplay(); 
   
    //Button
    button = digitalRead(inPin);   // read the input pin
    //Serial.println(button);

   delay(10);
  }

  if (button == 0 ){ //Code for Launch Button Pressed
    Serial.println("LAUNCH");
   
    //Play Sound
    tone(speakerPin, 700);
    delay(250);
    noTone(speakerPin);
    tone(speakerPin, 800);
    delay(250);
    noTone(speakerPin);
   
    h = seconds * 100;
   
   for (h!=0; h--;){
    
        if (h >= 6000){
          //Format Display ##:## for greater than 60sec
          segment.drawColon(true);
          segment.writeDigitNum(0, 0); //tens of minutes
          segment.writeDigitNum(1, (h/6000)); //minutes
          segment.writeDigitNum(3, ((h % 6000)/1000) % 10); //tens of seconds
          segment.writeDigitNum(4, (((h % 6000/100) % 10))); //seconds
          segment.writeDisplay();
          }
         
        //Format Display ##.## for less than 60 seconds 
        if (h < 6000) {
          segment.drawColon(false);
          segment.writeDigitNum(0,((h % 6000)/1000) % 10); //tens seconds
          segment.writeDigitNum(1, (((h % 6000/100) % 10)), true); // seconds
          segment.writeDigitNum(3,(h % 100) / 10); // tenths of seconds
          segment.writeDigitNum(4,(h % 100) % 10); // hundredths of seconds
          segment.writeDisplay();
         
       
        }
       
        //Play sound last 10 seconds
        if (h <= 1000) {
          if (h == 1000 ){
            tone(speakerPin, 800); //Play sound
          }
            if (h <= 1000 && (h % 100) / 10 == 0 && h > 50){
            tone(speakerPin, 800); //Play sound
          }
           if ((h % 100) / 10 == 8) {
              noTone(speakerPin);}
         }
        
         //Play sound every 30 seconds (1:30, 1:00, 30.0)
       
        if (h/100 == 30 || h/100 == 60 || h/100 == 90 && (h % 100) / 10 == 8){
          tone(speakerPin, 800); //Play sound
        }
       
         if ((h % 100) / 10 == 8) {
              noTone(speakerPin);
            }
             
        delay(10);
    }

So how would I change this code to work with a LCD, my time is wrote at 3,1 on my LCD as 00:00.

Thanks,

Austin

Reply

0 Former Member over 11 years ago

Hey Guys,

So I have found some code I believe will work, but I need to repurpose it for my LCD, since the original code uses a 7 Segment display.

int potPin = 0;
int seconds = 0;
int h = 0;




//Format Display #:## for greater than 60 seconds
    if (seconds >= 60){
      segment.drawColon(true);
      segment.writeDigitNum(0, 0);
      segment.writeDigitNum(1, (seconds/60)); //minutes
      segment.writeDigitNum(3, (seconds % 60)/10); //tens of seconds
      segment.writeDigitNum(4, (((seconds % 60) % 10))); //seconds
      segment.writeDisplay();
    }
   
    //Format Display ##.# for less than 60 seconds but greater than 10 seconds
    if (seconds >= 10 && seconds < 60) {
      segment.drawColon(false);
      segment.writeDigitNum(0, (seconds/10));
      segment.writeDigitNum(1, (seconds % 10), true);
      segment.writeDigitNum(3,0);
      segment.writeDigitNum(4,0);
      segment.writeDisplay();
    }
    //Format Display #.## for less than 10 seconds
    if (seconds < 10) {
      segment.drawColon(false);
      segment.writeDigitNum(0, 0);
      segment.writeDigitNum(1, seconds, true);
      segment.writeDigitNum(3,0);
      segment.writeDigitNum(4,0);
      segment.writeDisplay();
    }
   
   
     //segment.println(seconds);
    //segment.writeDisplay(); 
   
    //Button
    button = digitalRead(inPin);   // read the input pin
    //Serial.println(button);

   delay(10);
  }

  if (button == 0 ){ //Code for Launch Button Pressed
    Serial.println("LAUNCH");
   
    //Play Sound
    tone(speakerPin, 700);
    delay(250);
    noTone(speakerPin);
    tone(speakerPin, 800);
    delay(250);
    noTone(speakerPin);
   
    h = seconds * 100;
   
   for (h!=0; h--;){
    
        if (h >= 6000){
          //Format Display ##:## for greater than 60sec
          segment.drawColon(true);
          segment.writeDigitNum(0, 0); //tens of minutes
          segment.writeDigitNum(1, (h/6000)); //minutes
          segment.writeDigitNum(3, ((h % 6000)/1000) % 10); //tens of seconds
          segment.writeDigitNum(4, (((h % 6000/100) % 10))); //seconds
          segment.writeDisplay();
          }
         
        //Format Display ##.## for less than 60 seconds 
        if (h < 6000) {
          segment.drawColon(false);
          segment.writeDigitNum(0,((h % 6000)/1000) % 10); //tens seconds
          segment.writeDigitNum(1, (((h % 6000/100) % 10)), true); // seconds
          segment.writeDigitNum(3,(h % 100) / 10); // tenths of seconds
          segment.writeDigitNum(4,(h % 100) % 10); // hundredths of seconds
          segment.writeDisplay();
         
       
        }
       
        //Play sound last 10 seconds
        if (h <= 1000) {
          if (h == 1000 ){
            tone(speakerPin, 800); //Play sound
          }
            if (h <= 1000 && (h % 100) / 10 == 0 && h > 50){
            tone(speakerPin, 800); //Play sound
          }
           if ((h % 100) / 10 == 8) {
              noTone(speakerPin);}
         }
        
         //Play sound every 30 seconds (1:30, 1:00, 30.0)
       
        if (h/100 == 30 || h/100 == 60 || h/100 == 90 && (h % 100) / 10 == 8){
          tone(speakerPin, 800); //Play sound
        }
       
         if ((h % 100) / 10 == 8) {
              noTone(speakerPin);
            }
             
        delay(10);
    }

So how would I change this code to work with a LCD, my time is wrote at 3,1 on my LCD as 00:00.

Thanks,

Austin

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