Forget bulky GSM modules and SIM cards, now you can send real-time SMS alerts with ESP32 using the free SMS API from Circuit Digest Cloud. Perfect for applications like temperature monitoring, motion detection, or door-opening alerts. In this project learn how to deliver instant notifications directly to your phone without any apps, dashboards, and fees.
How It Works
- ESP32 connects to Wi‑Fi using SSID and password.
- It reads sensor data (e.g., temperature via DHT11).
- If a threshold is crossed (e.g., temp ≥ 30 °C), ESP32 sends an HTTP request to the SMS API.
- Circuit Digest Cloud validates your API key and sends an SMS to the linked phone number.
What You Will Need
- ESP32 Development Board
- DHT11 Temperature Sensor (or any sensor of your choice)
- Breadboard + Jumper Wires
- 5V USB Power Supply
Circuit Diagram
Getting Started: SMS API Key
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Visit Circuit Digest Cloud, sign in or register
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Generate your free API key (valid for 100 SMS/month)
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Add recipient phone number(s) via OTP
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Choose an SMS template (e.g., Template ID 102 for temperature alerts)
Applications of SMS API with ESP32
Smart Home & Security: Get alerts for critical events
DIY Prototyping: Fast, hardware-free SMS integration
Educational Projects: Learn HTTP, JSON, cloud APIs , all through ESP32
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