Project Hub /Audio Displays & Interactive Media/LED Matrix & Cube Displays/Multi-Tasking Reminder Gadget With Electronic Calendar

Intermediate

ARDUINO

₹1,500 – ₹5,000

3 – 6 Hours

Partial Kit

Multi-Tasking Reminder Gadget With Electronic Calendar

A multi-tasking reminder gadget built with an Arduino and RTC module that provides calendar displays, daily routine reminders, and sends mobile alerts via GSM if alarms are ignored.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino UNO R3 Board (Compatible) – ATmega328P Microcontroller with USB Cable Rs. 999.00
I2C Module for 16x2 (1602) Character LCD Rs. 109.00
Piezo Buzzer (Big) 6-12V Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: RTC Module DS3231 / DS1307
GSM / GPRS SIM800L

Browse all components

How It Works

The Multi-Tasking Reminder Gadget is controlled by an Arduino Uno, which acts as the central processing unit for coordinating timekeeping, alerts, and user interaction. Accurate time and date tracking are maintained by the RTC3231 module, communicating with the Arduino to provide a reliable electronic calendar and schedule. The current time, date, and reminder messages are continuously updated and shown to the user on the 16x2 LCD I2C module, which uses the I2C communication protocol to minimize wiring complexity. When a scheduled routine or alarm is triggered, the Arduino activates the buzzer to provide an immediate local audio notification. If the user fails to acknowledge or dismiss the alarm within a designated timeframe, the Arduino triggers the SIM800L GSM module. This cellular module uses a SIM card to transmit a text message alert to a designated mobile phone, ensuring that critical reminders are never missed even if the user is away from the device or ignores the local audio cue.

Why Build This

Build a practical assistive device that helps elderly family members or patients keep track of essential daily medication schedules.

Learn how to integrate real-time clock modules and cellular communication to build automated IoT and remote-alert systems.

Develop a personalized time-management tool that organizes school assignments, study blocks, and daily routines.

Real-World Application

Assisting elderly patients, individuals with memory impairments, patients needing medication schedules, and students with time management.

Skills You'll Learn

I2C communication

real-time clock synchronization

cellular module interfacing

serial communication (UART)

audio signaling with buzzers

LCD text rendering

state machine logic

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ARDUINO

REAL-TIME CLOCK

GSM MODULE

LCD DISPLAY

ELECTRONICS

EMBEDDED SYSTEMS

IOT

Frequently Asked Questions

Why does the project need both an Arduino Uno and a SIM800L module?

The Arduino Uno processes the logic, time data, and user interface, while the SIM800L module provides the cellular connectivity required to send text message alerts to a mobile phone.

How does the LCD connect to the Arduino without using too many digital pins?

The 16x2 LCD uses an I2C adapter module, which reduces the required connections to just four wires: power, ground, SDA, and SCL.

Does the SIM800L module require an external power supply?

Yes, cellular modules can draw high peak currents during network transmission that exceed the standard 5V output capacity of an Arduino Uno, so a separate stable power source for the SIM800L is typically recommended.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-01164