Project Hub /IoT & Connected Devices/Telemetry & Remote Logging/How to send SMS using ESP32

Beginner

ESP32

₹500 – ₹1,500

3 – 6 Hours

Complete Kit

How to send SMS using ESP32

Learn how to configure an ESP32 to read temperature data from a DHT11 sensor and send instant SMS alerts directly to your smartphone via Wi-Fi and an online SMS 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 WiFi+Bluetooth CP2102 Development Board Rs. 520.00
DHT11 Temperature and Humidity Sensor Module for Arduino Raspberry Pi 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
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

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How It Works

The core of this system is the ESP32 Development Board, which manages both data acquisition and wireless network communication. Connected to the breadboard and powered by a 5V Power Supply Adaptor, the circuit integrates a DHT11 Sensor to measure ambient temperature and humidity. The ESP32 polls the DHT11 sensor using its digital input-output pins to read the environmental values. Once the temperature data is captured by the microcontroller running code written in the Arduino IDE, the ESP32 utilizes its onboard Wi-Fi transceiver to connect to a local wireless network. Using standard networking libraries like WiFi.h and the DHT sensor library, the firmware formats an HTTP request containing the sensor data and transmits it to an online SMS API gateway. This external API processes the request and routes an instant SMS text message directly to a designated smartphone, enabling real-time remote notification without requiring a physical cellular module attached to the microcontroller.

Why Build This

Design an automated remote environmental monitoring system suitable for tracking facility conditions in undergraduate engineering applications.

Implement IoT communication protocols by bridging local hardware sensor data with cloud-based SMS messaging services via Wi-Fi.

Gain hands-on experience integrating digital sensors and microcontrollers on a breadboard for rapid prototyping and deployment.

Real-World Application

Remote environmental monitoring, automated warehouse temperature tracking, and security alert systems.

Skills You'll Learn

Microcontroller programming

Wi-Fi network interfacing

digital sensor integration

API communication

environmental data logging

Safety Precautions

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

Technology Tags

ESP32

WI-FI

HTTP API

DHT11 SENSOR

TEMPERATURE MONITORING

CLOUD SMS

Frequently Asked Questions

Do I need a separate cellular module to send the SMS?

No, the ESP32 connects to your local Wi-Fi network and uses an online SMS API to send the text message over the internet.

What software do I need to program the ESP32?

You will need the Arduino IDE installed on your computer, along with the WiFi.h header and the DHT sensor library.

How is power supplied to the circuit?

The circuit is powered using a 5V Power Supply Adaptor connected with a programming cable, which provides steady voltage to both the ESP32 board and the DHT11 sensor.

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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