Automatic Pill Dispenser Machine – Arduino UNO + RTC + Servo | MakeMindz

💊 Healthcare Automation Project

Automatic Pill Dispenser
Machine with Arduino

Smart medication management system using Arduino UNO, DS3231 RTC, servo motor and I2C LCD. Dispenses pills at scheduled times with buzzer reminders — designed for elderly care, clinics and home health monitoring.

⏰ DS3231 RTC ⚙️ Servo Motor 📟 I2C LCD 16×2 🔔 Buzzer Alert 🔘 Push Buttons 🏥 Healthcare IoT

01 — Overview

Project Overview

The Automatic Pill Dispenser Machine is a smart medication management system that dispenses tablets at user-programmed times with audio-visual alerts. Built on Arduino UNO with a DS3231 Real-Time Clock for accurate scheduling, the system uses a servo motor to physically release pills from a compartment while an I2C LCD and buzzer notify the user.

This project is practical for elderly patients, individuals with chronic conditions, and healthcare facilities. It can be further extended with GSM alerts, mobile app integration and cloud-based health tracking.

🏆

What makes it special: The DS3231 RTC maintains accurate time even during power interruptions, ensuring the dispenser never misses a dose schedule — critical for real-world medical applications.

02 — Features

Key Features

⏰

RTC Scheduling

DS3231 RTC maintains time through power cuts for reliable dose scheduling.

⚙️

Servo Dispensing

PWM-controlled servo rotates to release pills from the compartment automatically.

📟

I2C LCD Status

16×2 display shows current time, set dose time and dispensing messages.

🔔

Buzzer Alert

1 kHz tone reminds the user when medication is dispensed.

🔘

Button Interface

3 push buttons set hour, minute and confirm dose schedule without a screen keyboard.

🔒

Repeat Protection

alarmSet flag prevents re-triggering within the same scheduled minute.

📡

IoT Expandable

Designed for upgrade with GSM, Wi-Fi or cloud health monitoring modules.

🏥

Healthcare Ready

Reliable for elderly care, hospitals, home monitoring and chronic condition management.

03 – Hardware

Components Required

Arduino UNO – ATmega328P main controller

DS3231 RTC Module – Accurate real-time clock with battery backup

Servo Motor (SG90) – Controls pill dispensing mechanism

I2C 16×2 LCD Display – Status and time display (address 0x27)

Active Buzzer – Medication reminder alert

Push Button × 3 – Set Hour, Set Minute, Confirm

10kΩ Resistors × 3 – Button pull-up resistors (or use INPUT_PULLUP)

Breadboard & Jumper Wires – Circuit connections

5V Power Supply – USB or external adapter

Pill Storage Compartment – Physical container attached to servo

⚠️

RTC Battery: The DS3231 requires a CR2032 coin cell to maintain time during power cuts. Without it, the scheduled dose time resets on every power cycle. Always install the backup battery before deployment.

04 — Wiring

Circuit Connections

Component	Pin / Signal	Arduino UNO Pin	Notes
LCD SDA	I2C Data	A4 (SDA)	I2C shared bus
LCD SCL	I2C Clock	A5 (SCL)	I2C shared bus
LCD VCC	Power	5V
LCD GND	Ground	GND
RTC SDA	I2C Data	A4 (SDA)	Shares I2C bus with LCD
RTC SCL	I2C Clock	A5 (SCL)	Shares I2C bus with LCD
RTC VCC	Power	3.3V or 5V
RTC GND	Ground	GND
Servo Signal	PWM	D9	PWM-capable pin
Servo VCC	Power	5V	Use external 5V for real servo
Servo GND	Ground	GND
Buzzer +	Digital OUT	D6	Uses tone()
Buzzer −	Ground	GND
Button SET HOUR	INPUT_PULLUP	D2	Press = LOW
Button SET MIN	INPUT_PULLUP	D3	Press = LOW
Button CONFIRM	INPUT_PULLUP	D4	Press = LOW

  ┌──────────────────────────────┐    ┌─────────────────┐
  │    Arduino UNO              │    │ DS3231 RTC      │
  │  A4 (SDA)  ─────────────────────│ SDA             │
  │  A5 (SCL)  ─────────────────────│ SCL             │
  │  3.3V/5V   ─────────────────────│ VCC             │
  │  GND       ─────────────────────│ GND             │
  └──────────────────────────────┘    └─────────────────┘

  ┌──────────────────────────────┐    ┌─────────────────┐
  │  A4 (SDA)  ─────────────────────│ SDA  16×2 LCD   │
  │  A5 (SCL)  ─────────────────────│ SCL             │
  │  5V        ─────────────────────│ VCC             │
  │  GND       ─────────────────────│ GND             │
  └──────────────────────────────┘    └─────────────────┘

  D9  ────── [SERVO Signal]   5V ────── [SERVO VCC]   GND ── [SERVO GND]
  D6  ────── [BUZZER +]                                 GND ── [BUZZER −]
  D2  ────── [BTN SET HOUR]  D3 ────── [BTN SET MIN]  D4 ────── [BTN CONFIRM]
  (all buttons other side → GND, INPUT_PULLUP enabled)

💡

I2C shared bus: Both the LCD (0x27) and RTC DS3231 (0x68) share the same A4/A5 I2C lines. This is normal — each device has a unique address. No additional wiring is needed.

06 — Logic

How It Works

⚡

Boot

LCD shows splash, components initialise

⏱️

Time Check

RTC polled every loop — current time shown on LCD row 1

🔘

Set Schedule

Buttons increment hour/minute; CONFIRM displays set time

🎯

Match!

RTC hour & minute match schedule → dispensePill() called

💊

Dispense

Buzzer sounds, servo rotates 90°, waits 1s, returns to 0°

Variable / Constant	Value	Purpose
`setHour`	8 (default)	Scheduled dose hour (0–23)
`setMinute`	0 (default)	Scheduled dose minute (0–59)
`alarmSet`	bool	Prevents re-trigger within same minute
`buttonSetHour` (D2)	INPUT_PULLUP	Increments setHour (+1 mod 24)
`buttonSetMinute` (D3)	INPUT_PULLUP	Increments setMinute (+1 mod 60)
`buttonConfirmTime` (D4)	INPUT_PULLUP	Displays current schedule on LCD row 2
Servo open position	90°	Rotates to release pill
Servo closed position	0°	Returns to rest after 1 000 ms
Buzzer frequency	1 000 Hz	Alert tone during dispensing
Button debounce	200 ms delay	Prevents multiple increments per press

07 — Display

LCD Display Messages

The 16×2 I2C LCD provides real-time feedback across all system states.

Boot splash (2 s)

Smart Pill Dispenser

Normal operation

Time: 08:29:45

CONFIRM button pressed

Time: 08:29:55 Set: 8:0

Dispensing dose

Time: 08:00:01 Dispensing Pill!

08 — Arduino Code

Complete Arduino Sketch

Paste the code below into the Arduino IDE or Wokwi sketch editor. Requires LiquidCrystal_I2C, RTClib and the built-in Servo library.

pill_dispenser.ino

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include <Servo.h>

// ── Object Initialisation ──────────────────────────────────
LiquidCrystal_I2C lcd(0x27, 16, 2);  // LCD I2C address 0x27
RTC_DS3231 rtc;
Servo dispenserServo;

// ── Pin Definitions ────────────────────────────────────────
const int buttonSetHour    = 2;   // INPUT_PULLUP – press = LOW
const int buttonSetMinute  = 3;   // INPUT_PULLUP
const int buttonConfirmTime = 4;  // INPUT_PULLUP
const int buzzerPin         = 6;
const int servoPin          = 9;

// ── Scheduling Variables ───────────────────────────────────
int  setHour   = 8;     // Default dose hour (24-h format)
int  setMinute = 0;     // Default dose minute
bool alarmSet  = false; // Prevents re-trigger in same minute

// ── Setup ──────────────────────────────────────────────────
void setup() {
  lcd.begin();
  rtc.begin();
  dispenserServo.attach(servoPin);
  dispenserServo.write(0);          // Start at closed position

  pinMode(buzzerPin,         OUTPUT);
  pinMode(buttonSetHour,     INPUT_PULLUP);
  pinMode(buttonSetMinute,   INPUT_PULLUP);
  pinMode(buttonConfirmTime, INPUT_PULLUP);

  // Splash screen
  lcd.print("Smart Pill");
  lcd.setCursor(0, 1);
  lcd.print("Dispenser");
  delay(2000);
  lcd.clear();
}

// ── Main Loop ──────────────────────────────────────────────
void loop() {
  DateTime now = rtc.now();

  // Row 0: current time
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(now.hour());
  lcd.print(":");
  if (now.minute() < 10) lcd.print("0");
  lcd.print(now.minute());
  lcd.print(":");
  if (now.second() < 10) lcd.print("0");
  lcd.print(now.second());

  // Check if dose time reached
  if (now.hour() == setHour && now.minute() == setMinute && !alarmSet) {
    dispensePill();
    alarmSet = true;  // Block re-trigger in this minute
  }

  // Reset flag once minute advances
  if (now.minute() != setMinute) alarmSet = false;

  // ── Button Handlers ──────────────────────────────────────
  if (digitalRead(buttonSetHour) == LOW) {
    setHour = (setHour + 1) % 24;
    delay(200);  // Debounce
  }
  if (digitalRead(buttonSetMinute) == LOW) {
    setMinute = (setMinute + 1) % 60;
    delay(200);
  }
  if (digitalRead(buttonConfirmTime) == LOW) {
    lcd.setCursor(0, 1);
    lcd.print("Set: ");
    lcd.print(setHour);
    lcd.print(":");
    if (setMinute < 10) lcd.print("0");
    lcd.print(setMinute);
    lcd.print("  ");  // Clear trailing chars
    delay(500);
  }
}

// ── Dispense Function ─────────────────────────────────────
void dispensePill() {
  lcd.setCursor(0, 1);
  lcd.print("Dispensing Pill!");

  tone(buzzerPin, 1000);         // Sound 1 kHz alert
  dispenserServo.write(90);      // Rotate servo to release pill
  delay(1000);                    // Hold open for 1 second
  dispenserServo.write(0);       // Return to closed position
  noTone(buzzerPin);

  lcd.setCursor(0, 1);
  lcd.print("Dose Completed  ");
  delay(2000);
  lcd.setCursor(0, 1);
  lcd.print("                ");  // Clear row 2
}

📦

Required libraries: Install LiquidCrystal I2C by Frank de Brabander and RTClib by Adafruit via the Arduino Library Manager (Sketch → Include Library → Manage Libraries). The Servo library is built in.

09 — Use Cases

Applications

Elderly Patient Care — Reduces missed doses for seniors living alone

Hospital Automation — Scheduled dispensing in wards and clinics

Home Healthcare — Family-monitored medication management

Chronic Conditions — Diabetes, hypertension, epilepsy dose control

Smart Medical Devices — Prototype for connected health gadgets

IoT Health Reminders — Extendable to SMS/app push notifications

Veterinary Use — Pet medication scheduling

Embedded System Education — Teaching RTC, servo and I2C integration

10 — More Projects

ROBOTICS

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Arduino-Based Automatic Pill Dispenser Machine with LCD Display, Servo Motor and Buzzer Reminder

Automatic Pill Dispenser
Machine with Arduino

Project Overview

Key Features

RTC Scheduling

Servo Dispensing

I2C LCD Status

Buzzer Alert

Button Interface

Repeat Protection

IoT Expandable

Healthcare Ready

Components Required

Circuit Connections

How It Works

Boot

Time Check

Set Schedule

Match!

Dispense

LCD Display Messages

Complete Arduino Sketch

Applications

Related Projects

🌐 IoT & Smart Systems

🏭 Industrial / Automation

📡 Sensor & Detection

🤖 Robotics

Comments

Post a Comment

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Arduino-Based Automatic Pill Dispenser Machine with LCD Display, Servo Motor and Buzzer Reminder

Automatic Pill DispenserMachine with Arduino

Project Overview

Key Features

RTC Scheduling

Servo Dispensing

I2C LCD Status

Buzzer Alert

Button Interface

Repeat Protection

IoT Expandable

Healthcare Ready

Components Required

Circuit Connections

How It Works

Boot

Time Check

Set Schedule

Match!

Dispense

LCD Display Messages

Complete Arduino Sketch

Applications

Related Projects

🌐 IoT & Smart Systems

🏭 Industrial / Automation

📡 Sensor & Detection

🤖 Robotics

Comments

Post a Comment

try for free

Best 15 IoT Projects Using ESP32 for Beginners & Advanced Makers in 2026

BEST 25 ARDUINO WOKWI SIMULATOR PROJECTS

Top 20 Raspberry Pi Projects for Beginners - Complete Guide 2026

Intermediate Projects (Build Your Skills)

Advanced Projects (Master Level)

Automatic Pill Dispenser
Machine with Arduino