Adding a delay to a reed switch activation

Projects General Guidance
1

Hello, I'm fairly new and am more accustomed to tinkering than I am writing code completely from scratch. The code I currently need to modify currently functions like this:

  1. 4 reed switches will be activated by magnets
  2. This triggers stopping an audio file and starting another audio file
  3. After the audio file plays, there is a delay that would then switch the status to "complete" which triggers LED lights to light up in sequence.

My goal is to add in a delay in the beginning, so that if 4 reed switches are activated by the magnet, the "trigger" doesn't activate unless the magnets contact the reed switches for a specific period of time (let's say 2 seconds). Do you have any suggestions on how that can be added to the code easily without rewriting the entire code?

#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

// Arduino pins allocation
const int triggers = 2;
const int blacklight = 4; 
const int speaker_rx = 6;
const int speaker_tx = 7;

const int LED0 = 8;
const int LED1 = LED0 + 1;
const int LED2 = LED0 + 2;
const int LED3 = LED0 + 3;
const int LED4 = LED0 + 4;

// Flashing LED sequence
const int numDigits = 8;
const int puzzleSequence[numDigits] = {0,1,2,1,3,3,4,0};

// Speaker
SoftwareSerial mySoftwareSerial(speaker_rx, speaker_tx); // RX, TX
DFRobotDFPlayerMini myDFPlayer;

// State 
int sequenceIter = 0;
bool puzzleCompleted = false;
unsigned long ledLightTime = 1000;
unsigned long ledFlashTimer = millis();
unsigned long ledTransitiontimer = millis();

void setup()
{
  pinMode(triggers, INPUT);
  pinMode(blacklight, OUTPUT);
  pinMode(LED0, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);


  // Setup speaker
  mySoftwareSerial.begin(9600);
  Serial.begin(115200);

  Serial.println();
  Serial.println(F("DFRobot DFPlayer Mini Demo"));
  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));

  if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while(true);
  }
  Serial.println(F("DFPlayer Mini online."));

  myDFPlayer.volume(30);  //Set volume value. From 0 to 30*/
  myDFPlayer.loop(1);
}

void loop()
{
  if (!puzzleCompleted)
  {
    if (digitalRead(triggers) == HIGH)
    {
      myDFPlayer.disableLoop();
      myDFPlayer.stop();
	  delay(1000);
	  
      myDFPlayer.play(2);
      myDFPlayer.loop(2);
      myDFPlayer.enableLoop();
      
      delay(3000);
      puzzleCompleted = true;
    }
  }
  

  if (puzzleCompleted)
  {
    digitalWrite(blacklight, HIGH); 

    // Light up the LED sequence
    int ledStrip = puzzleSequence[sequenceIter] + LED0;
    char data[100];
    sprintf(data, "Lighting LED on pin [%d].", ledStrip);
    Serial.println(data);

    unsigned long currentTime = millis();
    for (int i = LED0; i <= LED4; i++)
    {
      if (i == ledStrip)
      {
        if (currentTime - ledFlashTimer < ledLightTime)
        {
          digitalWrite(i, HIGH);
        }
        else
        {
          digitalWrite(i, LOW);
        }
      }
      else
      {
        digitalWrite(i, LOW);  
      }
    }
    if (currentTime - ledTransitiontimer > (ledLightTime + 1000))
    {
      ledTransitiontimer = currentTime;
      ledFlashTimer = currentTime;
      sequenceIter++;
      if (sequenceIter >= numDigits)
      {
        sequenceIter = 0;
      }
    }
  }
  else
  {
    digitalWrite(blacklight, LOW); 
    for (int i = LED0; i <= LED4; i++)
    {
      digitalWrite(i, LOW);
    }
  }
}
2

You have to keep track of when the switches go HIGH and see how long it has been. Something like this:

//#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

// Arduino pins allocation
const int triggers = 2;
const int blacklight = 4;
const int speaker_rx = 6;
const int speaker_tx = 7;

const int LED0 = 8;
const int LED1 = LED0 + 1;
const int LED2 = LED0 + 2;
const int LED3 = LED0 + 3;
const int LED4 = LED0 + 4;

// Flashing LED sequence
const int numDigits = 8;
const int puzzleSequence[numDigits] = {0, 1, 2, 1, 3, 3, 4, 0};

// Speaker
SoftwareSerial mySoftwareSerial(speaker_rx, speaker_tx); // RX, TX
DFRobotDFPlayerMini myDFPlayer;

// State
int sequenceIter = 0;
bool puzzleCompleted = false;
const unsigned long ledLightTime = 1000;
unsigned long ledFlashTimer = millis();
unsigned long ledTransitiontimer = millis();
unsigned long triggerStart;
const unsigned long triggerDelay = 2000;
int prevTrig;

void setup()
{
  pinMode(triggers, INPUT);
  pinMode(blacklight, OUTPUT);
  pinMode(LED0, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);


  // Setup speaker
  mySoftwareSerial.begin(9600);
  Serial.begin(115200);

  Serial.println();
  Serial.println(F("DFRobot DFPlayer Mini Demo"));
  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));

  if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while (true);
  }
  Serial.println(F("DFPlayer Mini online."));

  myDFPlayer.volume(30);  //Set volume value. From 0 to 30*/
  myDFPlayer.loop(1);
}

void loop()
{
  int trig = digitalRead(triggers);
  if ( trig != oldTrig )
  {
    // new value so reset timer
    trigStart = millis();
  }

  if (!puzzleCompleted)
  {
    if (trig == HIGH)
    {
      if ( millis() - triggerStart >= triggerDelay )
      {
        myDFPlayer.disableLoop();
        myDFPlayer.stop();
        delay(1000);

        myDFPlayer.play(2);
        myDFPlayer.loop(2);
        myDFPlayer.enableLoop();

        delay(3000);
        puzzleCompleted = true;
      }
    }
  }

  if (puzzleCompleted)
  {
    digitalWrite(blacklight, HIGH);

    // Light up the LED sequence
    int ledStrip = puzzleSequence[sequenceIter] + LED0;
    char data[100];
    sprintf(data, "Lighting LED on pin [%d].", ledStrip);
    Serial.println(data);

    unsigned long currentTime = millis();
    for (int i = LED0; i <= LED4; i++)
    {
      if (i == ledStrip)
      {
        if (currentTime - ledFlashTimer < ledLightTime)
        {
          digitalWrite(i, HIGH);
        }
        else
        {
          digitalWrite(i, LOW);
        }
      }
      else
      {
        digitalWrite(i, LOW);
      }
    }
    if (currentTime - ledTransitiontimer > (ledLightTime + 1000))
    {
      ledTransitiontimer = currentTime;
      ledFlashTimer = currentTime;
      sequenceIter++;
      if (sequenceIter >= numDigits)
      {
        sequenceIter = 0;
      }
    }
  }
  else
  {
    digitalWrite(blacklight, LOW);
    for (int i = LED0; i <= LED4; i++)
    {
      digitalWrite(i, LOW);
    }
  }
}
3

Learn about programming state machines - this is how to implement real-world behaviours
like this - once you have figured out the state-transition diagram you'll understand your system
better too (ie figure out the awkward edge cases).

4

Thank you to both of you for the advice

5

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