Smart Agriculture Irrigation System

The Smart Agriculture Irrigation System operates by continuously monitoring soil moisture levels through a dedicated sensor module. When the soil moisture drops below a predefined threshold, the sensing circuit generates a signal. This local state change can trigger local switching via BC547 and BC317 transistors, which act as current amplifiers to drive indicator LEDs or interface with control logic. To enable remote operation, the system incorporates an HT12E encoder IC to serialize parallel data, which is then broadcasted wirelessly using 433MHz RF transmitter modules across the field. At the receiving end, a 433MHz RF receiver picks up the signal and feeds it into an HT12D decoder IC to reconstruct the original data stream. Concurrently, the core microcontroller—the ESP32 DevKit v1—processes system data and interfaces with the Adafruit IoT platform via Wi-Fi for remote monitoring and cloud connectivity. When a pump activation command is finalized, the control logic triggers a 5V single-changeover relay. The relay acts as an electrically isolated electronic switch capable of handling higher-power DC loads for the water pump. Flyback protection diodes such as the 1N4007 are placed across inductive loads like the relay coil to safely dissipate voltage spikes and protect sensitive components like the transistors and ICs from inductive kickback. Power is supplied uniformly via a stable DC power supply, ensuring that both the digital logic modules and analog sensing stages operate reliably within their designated voltage parameters.