IoT based Temperature and Humidity Data Monitoring and Transmission using STM32 Microcontroller and Rugged Board A5D2x Microprocessor, Designed a multi-stage loT project showcasing diverse interfacing and functionalities. In Stage 1, interfaced DHT11 sensor with STM32, capturing temperature and humidity data displayed on the terminal via UART. Stage 2 involved WE-10, transmitting DHT11 data to the cloud via MQTT Protocol. Stage 3 connected STM32 with DHT11 to the Rugged Board, displaying data on the terminal. Finally, in Stage 4, unified all stages, creating a comprehensive end-to-end loT system for acquiring, processing, and transmitting environmental data from DHT11 to the cloud through STM32, Rugged Board A5D2x, and WE-10., STM32F446RE, Rugged Board A5D2x, DHT-11, WE10, UART, Timer, MQTT, With breakpoints, C with STM32 HAL Libraries, Successfully delivered a robust end-to-end lot system by designing and implementing a multi-stage project. Achieved seamless interfacing of sensors (DHT11 and WE-10) with the STM32 microcontroller and Rugged Board A5D2x microprocessor. Demonstrated proficiency in data acquisition, processing, and transmission, showcasing expertise in UART and MQTT protocols. The project showcased not only technical skills in hardware interfacing but also the ability to integrate diverse components into a comprehensive loT solution.