• In this tutorial, you will learn how to send WhatsApp messages directly from an Arduino UNO R4 WiFi using the CircuitDigest Cloud Whastapp API. • Instead of using a GSM module, SIM card, or complex WhatsApp Business API setup, this method allows your Arduino to send alerts over WiFi using a simple HTTPS request. • This makes it much easier and more cost-effective to add real-time WhatsApp notifications to your Arduino projects. • To demonstrate how it works, we will connect an HC-SR04 ultrasonic sensor to the Arduino UNO R4 WiFi (because we will need wifi for this project, the normal Arduino UNO R3 or nano will not work). • Whenever an object comes closer than a defined distance, the Arduino sends the measured value to CircuitDigest Cloud. • The cloud platform then handles message formatting, template management, and WhatsApp delivery.

Article Summaries:

  • A new tutorial demonstrates how to send WhatsApp notifications directly from an Arduino UNO R4 WiFi board using the CircuitDigest Cloud WhatsApp API. The guide replaces the need for GSM modules or the complex WhatsApp Business API by having the Arduino post a small JSON payload over HTTPS to CircuitDigest Cloud. An HC‑SR04 ultrasonic sensor measures distance; when a threshold is crossed, the board sends the reading and phone number to the cloud, which formats the message in a pre‑approved template and delivers it to the user’s phone. The method limits recipients to five verified numbers and caps usage at 100 messages per month, offering a cost‑effective, Wi‑Fi‑only solution for real‑time alerts.
  • In this tutorial, you will learn how to send WhatsApp messages directly from an Arduino UNO R4 WiFi using the CircuitDigest Cloud Whastapp API. Instead of using a GSM module, SIM card, or complex WhatsApp Business API setup, this method allows your Arduino to send alerts over WiFi using a simple HTTPS request. This makes it much easier and more cost-effective to add real-time WhatsApp notifications to your Arduino projects. To demonstrate how it works, we will connect an HC-SR04 ultrasonic sensor to the Arduino UNO R4 WiFi (because we will need wifi for this project, the normal Arduino UNO R3

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