The Agri Drone Avionics System is a cutting-edge, compact electronics solution optimized for precision agriculture drones. This integrated system combines autonomous flight control via a high-performance STM32H7 processor, efficient power management for up to 12S configurations with PWM and CAN-based motor controllers, dual DC-DC power conversion (5V and 12V) with 5A capacity and protection circuitry, and advanced 9-axis sensors with barometric pressure measurement for precise drone stabilization and orientation. Enabling seamless communication between peripherals, the Agri Drone Avionics System streamlines drone system design, reducing complexity and enhancing performance for unparalleled efficiency in precision agriculture applications such as crop monitoring, spraying, and fertilization.