Comparison

Vayu is designed with a focus on modularity, hardware independence, and deterministic execution. While several open-source flight control frameworks such as PX4 and ArduPilot provide comprehensive and feature-rich solutions, their architectural design and target use cases differ from the objectives of the Vayu system.

Established platforms like PX4 and ArduPilot are designed to support a wide range of hardware configurations and application scenarios. As a result, they often adopt large, monolithic codebases with extensive feature sets. While this provides flexibility, it can introduce additional complexity, increase resource requirements, and make system-level modifications more challenging.

In contrast, the Vayu architecture emphasizes a lightweight and structured design. By explicitly separating hardware abstraction (NavHAL), execution management (VAIOS), and control logic (Vayu), the system achieves a clear separation of concerns. This enables easier customization, improved maintainability, and tighter control over execution behavior.

Another key distinction lies in execution control. Traditional systems rely on general-purpose RTOS frameworks with complex scheduling mechanisms, whereas Vayu adopts a purpose-driven execution model tailored for embedded control systems. This approach simplifies task management while ensuring deterministic timing for critical control loops.

From a hardware perspective, many existing systems are closely tied to specific microcontroller families or vendor-provided libraries. Vayu addresses this limitation through a dedicated hardware abstraction layer, allowing the same control logic to be deployed across different platforms with minimal changes.

Table 3.1 summarizes the key differences between the approaches.

It is important to note that the objective of Vayu is not to replace existing systems, but to explore a design space that prioritizes simplicity, control over execution, and hardware independence. This makes it particularly suitable for research, rapid prototyping, and systems where fine-grained control over architecture is required.