Arduino Email Alert System Using DHT11 & Circuitdigest Cloud API

Ever left your room and wondered what happened to the temperature while you were away? Maybe it got too hot. Maybe humidity spiked. And unless you were constantly watching a screen, you’d never know. That’s exactly the problem this project solves. Most beginner projects stop at printing values on a serial monitor. But in real applications, data alone isn’t enough. You need action. This Send Email Notifications using Arduino project adds that missing piece. Instead of just measuring temperature, it reacts when something goes wrong. Hardware Setup (Clean & Minimal) The setup is intentionally simple. You use an Arduino UNO R4 with built-in WiFi, and a DHT11 sensor for readings. The sensor connects to 5V, GND, and a single digital pin for data. No external modules. No complicated wiring. Just plug, connect, and you’re good to go. How It Works Behind the Scenes Once powered on, the Arduino connects to your WiFi. After that, it continuously reads temperature and humidity from the DHT11 s