Weather Station using STM32 with ThingSpeak IoT

This weather station and environmental monitoring project is orchestrated by the STM32 Blue Pill development board, which acts as the central processing unit. The system gathers real-time physical data through two primary sensing elements: the DHT11 sensor, which captures ambient temperature and relative humidity values via a digital single-bus protocol, and the soil moisture sensor, which measures volumetric water content in earth by outputting an analog voltage level corresponding to soil conductivity. The STM32 reads these incoming signals and translates them into readable metrics. For local data visualization, the microcontroller interfaces with a standard 16X2 LCD display, allowing users to view current environmental readings directly at the monitoring site. Simultaneously, to achieve Internet of Things (IoT) connectivity, the STM32 communicates with an ESP8266 WiFi module using serial AT commands or a pre-flashed firmware routine. The ESP8266 connects to a local wireless network and packages the temperature, humidity, and soil moisture data into HTTP GET or POST requests. These requests are transmitted over the internet to the ThingSpeak cloud platform, where incoming data streams are parsed, stored, and plotted onto real-time graphical channels for remote tracking and analysis.