Combining 2 programs to run in sequence

Projects Programming
1

Just when I think I have earned something, I get kicked below the belt again. LOL. I constructed the following code to use 2 photoresistors to turn on 2 LEDs. It works as it should. Here is the code.
They are wired as described in the Arduino examples.
This program uses 2 photoresistors at the end of the coding to stop the timer and determine the winner also. I'm wanting to run the 1st program to turn on 2 LEDS and once this has happened, allow that to trigger the sequential countdown in the second program. that starts on line 43-44. Any help would be appreciated..

PRE-STAGE CODING   car 1 uses pins A5 and pin 50.  The photoresistor value is 120.  Car 2 uses A4 and pin 48 and the value changes to 120
 
int ldr=A4;//Set A4(Analog Input) for LDR2.
int value=0;
void setup() {
Serial.begin(9600);
pinMode(48,OUTPUT);
}
 
void loop() {
value=analogRead(ldr);//Reads the Value of LDR(light).
 
if(value<=200)
  {
    digitalWrite(48,HIGH);//Makes the LED glow in Dark.
  }
  else
  {
    digitalWrite(48,LOW);//Turns the LED OFF in Light.
  }
}

_________________________________________________________________________________________________
Second code starts here.....


`#include<LiquidCrystal.h>


LiquidCrystal lcd(8, 9, 10, 11, 12, 13);


const byte buttonPin = 3; //starting line button for "GO"

const byte finishSensor1Pin = A0;
const byte finishSensor2Pin = A1;

const int darkThreshold = 250;

int LED6 = 6;   //lane 1 win light used to determine winner
int LED7 = 7;   //lane 2 win light used to determine winner
int LED1 = 41;
int LED2 = 43;
int LED3 = 45;

int finishSensor1;
int finishSensor2;
boolean finishFlag = false;
long startTime;
long stopTime;
float raceTime;

void setup()
{
 
  Serial.begin(9600);  
  pinMode(buttonPin, INPUT_PULLUP); 
  pinMode(LED1, OUTPUT);     //Configures the specified pin to behave as an output. 
  pinMode(LED2, OUTPUT);    
  pinMode(LED3, OUTPUT);
  pinMode(LED6, OUTPUT);
  pinMode(LED7, OUTPUT);
   
  digitalWrite(LED1, HIGH);   
  digitalWrite(LED2, HIGH);
  digitalWrite(LED3, HIGH);
  digitalWrite(LED6, HIGH);  
  digitalWrite(LED7, HIGH); 
  
  delay(4000);
  digitalWrite(LED1, LOW);    
  delay(1000); 
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);     
  delay(1000);
  digitalWrite(LED2, HIGH);
  digitalWrite(LED3, LOW);    
  delay(4000);
  digitalWrite(LED3, HIGH);
  
  

  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Drag Strip Timer");  // display Line 1 on lcd
  lcd.setCursor(0, 1);
  lcd.print("Push to start!");  // display Line 2 on lcd
  
  while (digitalRead(buttonPin) == HIGH)
  {
  }

  lcd.clear();
  lcd.print("Go!");
  lcd.setCursor(0, 1);
  lcd.print("Who will win?"); 
  
  startTime = millis();
}

void loop()
{
  //read the finish sensors at the same time
  finishSensor1 = analogRead(finishSensor1Pin);
  finishSensor2 = analogRead(finishSensor2Pin);
  if (finishFlag == false)
  {
    //car #1 crosses first
    if ((finishSensor1 < darkThreshold) && (finishSensor2 > darkThreshold))
    {
      stopTime = millis();
      raceTime = stopTime - startTime;
      finishFlag = true;
      digitalWrite(LED6, LOW);
      lcd.clear();
      lcd.print("Winner Lane #1");  //displayed if lane 1 photeresistor changes state before lane 2
      lcd.setCursor(0, 1);
      lcd.print("Time: ");
      lcd.print(raceTime / 1000, 3);
    }
    //car #2 crosses first
    else if ((finishSensor2 < darkThreshold) && (finishSensor1 > darkThreshold))
    {
      stopTime = millis();
      raceTime = stopTime - startTime;  //formula used to determine elapsed time
      finishFlag = true;
      digitalWrite(LED7, LOW); 
      lcd.clear();
      lcd.print("Winner Lane #2");   //displayed if lane 2 photeresistor changes state before lane 1
      lcd.setCursor(0, 1);
      lcd.print("ET: ");  //displays winning elapsed time
      lcd.print(raceTime / 1000, 3);
    }
  }
}


 `
2

The line numbers are part of the IDE screen, not part of your code, so we can't see line numbers.

You can make EACH program a function, and run the functions individually from loop(). Any conflicting names will have to be resolved by yourself.
Paul

3

With some more basic knowledge about how writing programs for arduino works you will understand why it does not yet work

any program has only one function

void setup {
}

and one function

void loop  {
}

I recommend that you read at least part 1, part 2 and part 15 of this tutorial

Of course it will be good if you work through all parts.

Arduino Programming Course

It is easy to understand and has a good mixture between explaining important concepts and example-codes to get you going. So give it a try and report your opinion about this tutorial.

best regards Stefan

4

This is my tutorial giving step by step instructions and some warnings about Merging Code

Edit:- Just had a look at it and it seems two screen dumps are being displayed a bit odd. As it is a few years since I wrote this it seems like the HTML generator is a bit out of date. I will have to fix this sometime but it was written in the now obsolete and unsupported app iWeb.

Edit 2:- When you come to the two "wrong" pictures, then left click on them and select "open image in New Tab" to see them displayed correctly. Sorry but it is a quick work round while I get things sorted out.

5

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