Medicine reminder box

Install first: RTClib, Adafruit NeoPixel, Adafruit SSD1306, Adafruit GFX Library

#include <WiFi.h>
#include <WebServer.h>
#include <Wire.h>
#include <RTClib.h>
#include <Adafruit_NeoPixel.h>
#include <Adafruit_SSD1306.h>

const char* WIFI_NAME = "your-wifi";
const char* WIFI_PASS = "your-password";
const long  UTC_OFFSET = 19800;                 // India, UTC+5:30

struct Dose { int h, m; };
const Dose DOSES[] = {{8, 0}, {14, 0}, {21, 0}};
const int N = sizeof(DOSES) / sizeof(DOSES[0]);

const int LED_PIN = 4, REED_PIN = 27, BTN_PIN = 14, BUZZER_PIN = 26;
RTC_DS3231 rtc;
Adafruit_NeoPixel leds(7, LED_PIN, NEO_GRB + NEO_KHZ800);
Adafruit_SSD1306 oled(128, 64, &Wire, -1);
WebServer server(80);
int pending = -1;                 // index of the dose waiting to be taken
String takenAt[4];

int compartment(DateTime t) { return (t.dayOfTheWeek() + 6) % 7; }   // Monday = 0

void draw(DateTime t) {
  oled.clearDisplay(); oled.setTextColor(SSD1306_WHITE);
  oled.setTextSize(2); oled.setCursor(0, 0); oled.printf("%02d:%02d", t.hour(), t.minute());
  oled.setTextSize(1); oled.setCursor(0, 30);
  if (pending >= 0) oled.print("Time for your medicine");
  else for (int i = 0; i < N; i++) if (DOSES[i].h * 60 + DOSES[i].m > t.hour() * 60 + t.minute()) { oled.printf("Next dose %02d:%02d", DOSES[i].h, DOSES[i].m); break; }
  oled.display();
}

void setup() {
  pinMode(REED_PIN, INPUT_PULLUP); pinMode(BTN_PIN, INPUT_PULLUP); pinMode(BUZZER_PIN, OUTPUT);
  Wire.begin(21, 22);
  rtc.begin(); leds.begin(); leds.setBrightness(60);
  oled.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  WiFi.begin(WIFI_NAME, WIFI_PASS);
  for (int i = 0; i < 40 && WiFi.status() != WL_CONNECTED; i++) delay(250);
  if (WiFi.status() == WL_CONNECTED) {                  // set the RTC from the internet
    configTime(UTC_OFFSET, 0, "pool.ntp.org");
    struct tm now; if (getLocalTime(&now)) rtc.adjust(DateTime(now.tm_year + 1900, now.tm_mon + 1, now.tm_mday, now.tm_hour, now.tm_min, now.tm_sec));
  }
  server.on("/", [] {
    String s = "<meta name=viewport content='width=device-width'><h2>Today's medicine</h2>";
    for (int i = 0; i < N; i++) s += "<p>" + String(DOSES[i].h) + ":" + (DOSES[i].m < 10 ? "0" : "") + String(DOSES[i].m) + " &mdash; " + (takenAt[i].length() ? "taken at " + takenAt[i] : "not yet") + "</p>";
    server.send(200, "text/html", s);
  });
  server.begin();
}

void loop() {
  server.handleClient();
  DateTime t = rtc.now();
  if (t.hour() == 0 && t.minute() == 0) for (auto& s : takenAt) s = "";
  for (int i = 0; i < N; i++)
    if (t.hour() == DOSES[i].h && t.minute() == DOSES[i].m && takenAt[i] == "") pending = i;

  bool opened = digitalRead(REED_PIN) == HIGH, pressed = digitalRead(BTN_PIN) == LOW;
  if (pending >= 0 && (opened || pressed)) { takenAt[pending] = String(t.hour()) + ":" + String(t.minute()); pending = -1; }

  leds.clear();
  if (pending >= 0) leds.setPixelColor(compartment(t), leds.Color(255, 170, 40));
  leds.show();
  digitalWrite(BUZZER_PIN, pending >= 0 && (millis() / 700) % 3 == 0);
  draw(t);
  delay(200);
}