Project Hub /IoT & Connected Devices/Telemetry & Remote Logging/How to Send Email Notifications from ESP32 using CircuitDigest Cloud

Beginner

ESP32

₹500 – ₹1,500

3 – 6 Hours

Complete Kit

How to Send Email Notifications from ESP32 using CircuitDigest Cloud

Learn how to trigger automated email alerts from an ESP32 microcontroller using the CircuitDigest Cloud Email Notification API and an ultrasonic sensor.

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
Ultrasonic Sensor Module HC-SR04 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

This IoT-based telemetry project utilizes an ESP32 DevKit v1 microcontroller integrated with an HC-SR04 ultrasonic sensor to monitor physical distance and transmit automated alerts over the internet. The HC-SR04 sensor operates by emitting a high-frequency sound wave and measuring the time it takes for the echo to return after reflecting off a nearby object. The ESP32 processes this time interval to calculate the precise distance in centimeters. When the measured distance crosses a predefined threshold—indicating an event such as an intrusion or proximity change—the ESP32 connects to a local Wi-Fi network using its onboard radio. Leveraging the Arduino IDE environment and the WiFi.h and WiFiClientSecure libraries, the microcontroller establishes a secure HTTPS connection with the CircuitDigest Cloud Email Notification API. It then payloads the relevant telemetry data or alert message directly to the cloud service, which subsequently triggers and dispatches an email notification to the designated recipient.

Why Build This

Develop practical undergraduate-level experience in integrating physical sensors with cloud-based IoT application programming interfaces (APIs).

Construct reliable automated early-warning systems applicable to industrial safety, remote monitoring, and automated property security.

Gain hands-on proficiency in handling secure HTTP/HTTPS network requests directly from resource-constrained microcontrollers.

Real-World Application

Proximity alerts, safety warnings, intrusion detection, and automated industrial or home monitoring systems.

Skills You'll Learn

Ultrasonic distance measurement

microcontroller Wi-Fi provisioning

secure cloud API communication

HTTP client requests

sensor data processing

Safety Precautions

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

Technology Tags

ESP32

HC-SR04

IOT

WI-FI

HTTPS

CLOUD API

EMAIL NOTIFICATION

C++

Frequently Asked Questions

Can I use any other microcontroller besides the ESP32?

This specific project requires a microcontroller with built-in Wi-Fi capabilities, such as the ESP32, to communicate with the cloud API; standard boards like the Arduino Uno would need an additional Wi-Fi module.

How does the ESP32 connect to the internet?

The ESP32 uses its internal Wi-Fi transceiver, configured via the Arduino IDE using the WiFi.h library, to log into your local wireless router.

What libraries do I need to install in the Arduino IDE?

You will need the standard ESP32 board definitions installed, along with the built-in WiFi.h and WiFiClientSecure.h libraries for managing secure network connections.

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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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