Temperature And Humidity Monitoring With Email & SMS Alerts

This IoT environmental monitoring system relies on the integration of a DHT11 sensor and a WeMos D1 R1 microcontroller board to track ambient temperature and relative humidity. The DHT11 utilizes a capacitive humidity sensor and a thermistor to measure the surrounding air, converting these physical environmental readings into digital signals. Connection wires interface the DHT11 directly to the digital and power pins of the WeMos D1 R1 board, which is built around the ESP8266 Wi-Fi architecture. Powered via a standard USB cable for programming and operation, the microcontroller executes custom code written through the Arduino IDE. After initializing the CH340G USB driver to ensure proper serial communication with your computer, the ESP8266 connects to a local wireless network. Once connected, the firmware periodically polls the DHT11 sensor for updated environmental data. The microcontroller then formats this temperature and humidity information and transmits it over the internet to the Ubidots IoT cloud platform using HTTP or MQTT protocols. Within Ubidots, pre-configured event triggers and rules monitor the incoming data streams against user-defined thresholds. If the temperature or humidity falls outside of acceptable parameters, the platform automatically initiates external notification routines, dispatching email and SMS alerts directly to the user to ensure timely intervention in sensitive environments.