Project Hub /Audio Displays & Interactive Media/LED Matrix & Cube Displays/How to Use ESP32-CAM for Attendance System using CircuitDigest Cloud

Intermediate

ESP32

₹500 – ₹1,500

3 – 6 Hours

Partial Kit

How to Use ESP32-CAM for Attendance System using CircuitDigest Cloud

An automated IoT-based attendance system using an ESP32-CAM, rotary encoder, and OLED display that captures user photos and sends check-in/check-out alerts directly to WhatsApp via the CircuitDigest Cloud API.

Originally published on CircuitDigest

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.

ESP32 CAM WiFi Module Bluetooth with OV2640 Camera Rs. 810.00
0.96 Inch I2C/IIC 4pin OLED Display Module White Rs. 349.00
USB to UART/ESP8266 Adapter Programmer for ESP-01 WiFi Modules with CH340G Chip Rs. 99.00
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: Rotary Encoder
Perfboard / Veroboard / Stripboard
Enclosure / Box / Case
puff board

Browse all components

How It Works

This automated attendance system operates by integrating image capture, local user interaction, and cloud connectivity through the ESP32-CAM microcontroller. When a user interacts with the system, the KY-040 rotary encoder allows for navigating menus or selecting options locally. The SSD1306 OLED display provides a visual interface, showing real-time system status, prompts, and check-in or check-out confirmations directly to the user. Powered by the ESP32-CAM, the integrated camera module captures a photograph of the user during the attendance event. The ESP32's built-in Wi-Fi capability then transmits this captured data and attendance status securely via the CircuitDigest Cloud API. This cloud integration routes the alert directly to a designated WhatsApp chat, providing instant verification. All components—including the microcontroller, display, and rotary encoder—are wired together on a perf board, housed neatly inside a project enclosure, and initially programmed using a USB-to-Serial FTDI adapter.

Why Build This

Design a tamper-resistant, automated attendance tracking solution suitable for undergraduate laboratories, classrooms, and hostel check-ins.

Gain practical experience deploying IoT edge devices that interface local hardware inputs and displays with cloud-based messaging APIs like WhatsApp.

Learn how to integrate camera modules and user interface peripherals such as rotary encoders and OLED screens on custom perf board layouts.

Real-World Application

Classrooms, coaching centers, hostels, and small offices for automated, tamper-resistant attendance tracking with instant visual confirmation via WhatsApp.

Skills You'll Learn

I2C communication

SPI/Camera interface handling

GPIO polling for rotary encoders

RESTful API integration over Wi-Fi

hardware prototyping on perf board

Safety Precautions

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

Technology Tags

ESP32-CAM

IOT

WI-FI

WHATSAPP API

OLED DISPLAY

ROTARY ENCODER

NTP

CLOUD API

Frequently Asked Questions

Why is a USB-to-Serial FTDI adapter required for the ESP32-CAM?

The standard ESP32-CAM module lacks an onboard USB port and chip, requiring an external FTDI adapter to upload code from the Arduino IDE.

How does the system send messages to WhatsApp?

The ESP32-CAM connects to local Wi-Fi and makes HTTP requests to the CircuitDigest Cloud API, which handles the backend integration to deliver WhatsApp alerts.

What is the role of the KY-040 rotary encoder in an attendance system?

The rotary encoder allows users to navigate menus, select user IDs, or toggle between check-in and check-out modes using the OLED display.

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.

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