Arduino alarm clock

pill_timer.ino

#include "SSD1306.h" // alias for `#include "SSD1306Wire.h"`

#include <SPI.h>
#include <ezTime.h>
#include <SPIFFS.h>
#include <ESPAsyncWebServer.h>
#include <WiFi.h>

AsyncWebServer server(80);
SSD1306 display(0x3c, 4, 15);
#define SS 18
#define RST 14
#define DI0 26

Timezone myTZ;
time_t current_time;

// Hour and Minute
byte alarm_times[128][2] = {
  { 6, 0 },
  { 8, 30 },
  { 11, 0 },
  { 13, 30 },
  { 16, 0 },
  { 18, 30 },
  { 23, 0 }
};
int freq = 2000;
int channel = 0;
int resolution = 8;
volatile bool alarm_stop_flag = false;

void setup() {
  pinMode(16,OUTPUT);
  digitalWrite(16, LOW); // set GPIO16 low to reset OLED
  delay(50);
  digitalWrite(16, HIGH);

  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.drawString(0, 0, "Connecting...");
  display.display();

  Serial.begin(115200);
  while (!Serial); //if just the the basic function, must connect to a computer

  if(!SPIFFS.begin(true)){
    Serial.println("An Error has occured mounting SPIFFS");
    return;
  }

  ledcSetup(channel, freq, resolution);
  ledcAttachPin(18, channel);
  
  WiFi.begin("secret ssid", "secret password");
  waitForSync();
  display.drawString(0, 10, "Connected!");
  
  server.on("/alarm_times", HTTP_GET, [](AsyncWebServerRequest *request) {
    String json_response = "[";
    for(int i = 0; i < sizeof(alarm_times) / sizeof(alarm_times[0]); i++) {
      if(alarm_times[i] == 0) continue;
      json_response += "[\"" + String(alarm_times[i][0]) + "\"," + String(alarm_times[i][0]) + "], ";
    }
    json_response += "\"\"]";
    request->send(200, "application/json", json_response);
  });
  
  server.serveStatic("/", SPIFFS, "/www/");
  
  server.begin();
  myTZ.setLocation("America/Phoenix");
  myTZ.setDefault();
  current_time = myTZ.now();
  display.drawString(0, 20, String(current_time));
  display.display();
  secondPoll();
  pinMode(36, INPUT);
  attachInterrupt(digitalPinToInterrupt(36), stopAlarm, CHANGE);
}

void loop() {
  events();
}

void activateAlarm() {
  ledcWrite(channel, 125);
  alarm_stop_flag = false;
  while (not alarm_stop_flag) {
    for(int i = 0; i < 2; i++){
      ledcWriteTone(channel, 700);
      delay(300);    
      ledcWrite(channel, 0);
      delay(300);
    }    
  }
  ledcWrite(channel, 0);
}

void stopAlarm() {
  alarm_stop_flag = true;
}

void checkAlarm(tmElements_t current_time) {
  for(int i = 0; i < sizeof(alarm_times) / sizeof(alarm_times[0]); i++) {
    if(current_time.Hour == alarm_times[i][0] and current_time.Minute == alarm_times[i][1]){
      activateAlarm();
    }
  }
}

void secondPoll() {
  int hour_12hr;
  tmElements_t tm;
  breakTime(myTZ.now(), tm);
  setEvent(secondPoll, current_time + 1);
  display.clear();
  display.drawString(1, 1, myTZ.dateTime("m/d/y g:i:s A"));
  display.display();
  if (tm.Second == 0) {
    checkAlarm(tm);
  }
}