IoT
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ESP32 Bluetooth Jammer Using Dual NRF24L01 Modules Bluetooth communication is everywhere. Due to its low power consumption, we can see it in a lot of our day-to-day gadgets. Behind the scenes, it's all about signals. Let’s explore what really happens when data is transmitted or disturbed via Bluetooth. This project is based on an ESP32 and two NRF24L01 modules, and we are going to learn how we can generate a 2.4 GHz… |
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How to activate Airtel M2M IoT SimCard with Geolinker ESP32 Airtel M2M IoT SIM Activation – Quick Overview Log in to Circuit Digest Cloud & open the GeoLinker dashboard Enter ICCID and mobile number, verify OTP. Submit KYC documents (within 7 days) KYC verified by Airtel Whitelist up to 4 numbers for SMS/Voice Table of Contents What is an Airtel M2M SIM Card? Accessing the Airtel M2M SIM Dashboard on Circuit Digest Cloud Step 1 ⇒ How… |
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How to Build Smart Grid in IoT Using Arduino UNO R4 WIFI Electrical energy is no longer treated as an unlimited utility. Every watt consumed has a cost impact, an efficiency implication, and in many cases a safety consequence. A smart grid in IoT is not a complicated buzzword. It simply means that electrical infrastructure is monitored continuously, data is collected in real time, and decisions are made based on measured… |
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How to Send an Image on WhatsApp Using ESP32-CAM We use WhatsApp almost every day so much that it has become an unavoidable part of our routine. From a simple “good morning” message to a friend to a “good night” text to family, most of our daily communication happens through it. Beyond just messages, we constantly share moments from our lives by capturing photos on our phones and instantly sending them to others.… |
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Build a Speaking Alarm Clock Using the XIAO ESP32-S3 Traditional alarm clocks have remained fundamentally unchanged for decades. The ESP32 speaking alarm clock built in this tutorial replaces the beep at a scheduled time and expects the user to interpret the reason for the beep. While functional, this approach lacks intelligence and context. Modern embedded systems enable the creation of smarter devices that… |
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How to Send Email Notifications using ESP32-CAM In recent years, the demand for smart security and automated monitoring systems has increased significantly due to growing safety concerns and the need for real-time surveillance. Traditional security systems often require continuous human supervision, which can be inefficient and time-consuming. With the advancement of embedded systems and Internet of Things (IoT)… |
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Rohde & Schwarz and Broadcom showcase first Wi-Fi 8 RF signaling tests, paving way for next-gen connectivity Rohde & Schwarz, in collaboration with Broadcom, will display its CMX500 multi-technology multi-channel signaling tester at MWC Barcelona 2026 with newly added Wi-Fi 8 (IEEE 802.11bn) testing capabilities. The setup at the Rohde & Schwarz booth (5A80) will validate a prototype Wi-Fi 8 device from Broadcom, showcasing physical layer features unique to Wi-Fi 8. Addressing UHR… |
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Raspberry Pi Pico Based Rain Detection System with WhatsApp Alert This project shows how to send instant WhatsApp alerts from a Raspberry Pi Pico W using WiFi and CircuitDigest Cloud WhatsApp API. The Pico W reads data from a rain sensor and, when moisture is detected, sends a notification directly to your WhatsApp. No GSM module, SIM card, or cellular hardware is required and everything works over a secure HTTPS request. The same WhatsApp notification… |
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How to Send WhatsApp Messages from Arduino Uno R4 Wifi Board In this tutorial, you will learn how to send WhatsApp messages from 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… |
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How to Send WhatsApp Messages from ESP32 This ESP32 WhatsApp notification project shows how to send real-time WhatsApp alerts directly from an ESP32 using WiFi and the CircuitDigest Cloud WhatsApp API. The ESP32 reads sensor data, checks for a defined condition such as high temperature or motion detection, and immediately pushes a WhatsApp alert to your phone. And the best part is, you do not need a… |
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Real-Time Image Capture and Send Email Using ESP32-CAM ESP32-CAM is a compact size, low-cost dev board with a camera, making it extremely convenient for camera-based applications. Even though it offers fewer GPIO pins compared to other ESP32 boards, it performs exceptionally well for focused tasks where imaging and connectivity matter the most. In this project, we’ll put the ESP32-CAM to good use by capturing a clear… |
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DigiKey and Arduino Host Prototyping Webinar THIEF RIVER FALLS, Minn., USA – DigiKey, the global distribution leader of electronic components and automation products, announces an upcoming webinar, “From board to build: Using UNO Q and App Lab,” which will take place Feb. 12, 2026, at 9 a.m. CST. The webinar, sponsored by Arduino, will explore how Arduino’s UNO Q and App Lab work together to accelerate prototyping, enable… |
