Toilet Lid Open?

// Reed-Switch with Particle Photon - works with v0.7.0-rc.3 without Libaries
// Ingo Lohs, v1.0 v. 19.11.2017
// Projekt, um über einen Signalton auf einen offenen Toiletten-Deckel hinzuweisen
// es dient eher einer erzieherischen Massnahme die Toilette nicht über die Massen zu blockieren
// Project to indicate a beep on an open toilet lid
// it is more of an educational measure not to block the toilet from the masses

// https://community.particle.io/t/cross-check-required/37466/6

// ToDo:
// * how often was the toilet used? Any ideas for a counter?
// * how long was the lid actually open (measurement of time to see how the behavior changes over time)?

    /* 
             -----[    ]-----
            -|VIN        3V3|-    
     Buzzer -|GND        RST|-
            -|TX        VBAT|-
            -|RX         GND|-
            -|WKP         D7|-
            -|DAC         D6|-
            -|A5          D5|-
     Buzzer -|A4          D4|- reed switch
            -|A3          D3|- 
            -|A2          D2|- reed switch
            -|A1          D1|- SCL
            -|A0          D0|- SDA
              \____________/
             
    */

// **************

#include "application.h"                      // necessary when using Timer

const int REED_PIN_IN = D2;                   // Pin connected to reed switch
const int REED_PIN_OUT = D4;                  // Pin connected to reed switch
const int BUZZER_PIN_OUT = A4;                // Pin connected to a buzzer and to GND // On the Photon, P1 and Electron, this function works on pins D0, D1, D2, D3, A4, A5, WKP, RX and TX
const int LED_PIN = D7;                       // Pin internal LED 
const int standard_toilette_session = 120000; // how many seconds is your standard time for your job on toilette? (= 120 seconds = 2 minutes) 

Timer timer(standard_toilette_session, readData); // https://docs.particle.io/reference/firmware/photon/#software-timers

// **************

void setup() 
{
  Serial.begin(9600);
  pinMode(REED_PIN_IN, INPUT);
  pinMode(REED_PIN_OUT, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN_OUT, OUTPUT);
  
  timer.start();
}

// **************

/*
void loop() 
{
// the trigger comes via the expired Timer - no loop necessary
}
*/

// ************** 

void readData()
{
            int lid_open = digitalRead(REED_PIN_IN); // Read the state of the switch
            if (lid_open == HIGH)
            // ALARM // the user reads newspaper or something else and blocks the toilet or in the worst case does not close the lid
            {
                digitalWrite(LED_PIN, HIGH); // Turn the LED on - optical warning
                // Particle.publish("Toilette", "forgot to close the lid", PRIVATE); // the Particle Cloud knows what you not learned
                // Buzzer on - accustical warning
                    // notes in the melody:
                    // https://docs.particle.io/reference/firmware/photon/#tone-
                    int melody[] = {1908,2551,2551,2273,2551,0,2024,1908}; //C4,G3,G3,A3,G3,0,B3,C4
                    // note durations: 4 = quarter note, 8 = eighth note, etc.:
                    int noteDurations[] = {4,8,8,4,4,4,4,4};
                    // iterate over the notes of the melody:
                    for (int thisNote = 0; thisNote < 8; thisNote++)   
                    {
                    // to calculate the note duration, take one second
                    // divided by the note type.
                    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
                    int noteDuration = 1000/noteDurations[thisNote];
                    tone(BUZZER_PIN_OUT, melody[thisNote], noteDuration);
                    // to distinguish the notes, set a minimum time between them.
                    // the note's duration + 30% seems to work well:
                    int pauseBetweenNotes = noteDuration * 1.30;
                    delay(pauseBetweenNotes);
                    // stop the tone playing:
                    noTone(BUZZER_PIN_OUT);
                    }  
                digitalWrite(LED_PIN, LOW); // Turn the LED off
                    // the annoying melody is played continuously until the lid is closed
            }
            else if ((lid_open == LOW) and (timer.isActive() == TRUE)) // case the lid if not open, but the timer is not expired
            {
                digitalWrite(LED_PIN, LOW); // Turn the LED off 
                timer.reset(); // https://docs.particle.io/reference/firmware/photon/#reset--1
            }
            else
            // all is fine // the user closed the lid during the defined delay time
            {
                digitalWrite(LED_PIN, LOW); // Turn the LED off 
                timer.reset();
            }
}