This paper presents the system architecture for networked sensors, focusing on a small, low-power device that supports efficient modularity and concurrency. The authors identify key requirements for networked sensors, develop a representative device, and design a tiny event-driven operating system called TinyOS. TinyOS is designed to fit in 178 bytes of memory and supports efficient modularity and concurrency-intensive operation. The system is evaluated against benchmarks and compared to existing embedded operating systems. The paper outlines the design requirements for networked sensors, including small physical size, low power consumption, concurrency-intensive operation, limited physical parallelism, and diversity in design and usage. The authors also discuss the importance of robust operation and the need for efficient modularity. The paper presents a detailed hardware design, including a microcontroller, sensors, and communication components. The TinyOS operating system is described, along with its design and implementation. The paper evaluates the performance of the system and compares it to other operating systems. The authors conclude that the system architecture for networked sensors must be designed to support efficient modularity and concurrency, and that TinyOS provides a viable solution for this purpose. The paper also discusses the implications of the system architecture for future developments in networked sensors.This paper presents the system architecture for networked sensors, focusing on a small, low-power device that supports efficient modularity and concurrency. The authors identify key requirements for networked sensors, develop a representative device, and design a tiny event-driven operating system called TinyOS. TinyOS is designed to fit in 178 bytes of memory and supports efficient modularity and concurrency-intensive operation. The system is evaluated against benchmarks and compared to existing embedded operating systems. The paper outlines the design requirements for networked sensors, including small physical size, low power consumption, concurrency-intensive operation, limited physical parallelism, and diversity in design and usage. The authors also discuss the importance of robust operation and the need for efficient modularity. The paper presents a detailed hardware design, including a microcontroller, sensors, and communication components. The TinyOS operating system is described, along with its design and implementation. The paper evaluates the performance of the system and compares it to other operating systems. The authors conclude that the system architecture for networked sensors must be designed to support efficient modularity and concurrency, and that TinyOS provides a viable solution for this purpose. The paper also discusses the implications of the system architecture for future developments in networked sensors.