zephyrproject-rtos/zephyr

Zephyr is a real-time operating system (RTOS), a type of software that controls hardware devices and ensures tasks are completed within precise time limits. Unlike operating systems like Windows or macOS that run on full computers, an RTOS is designed for small, resource-constrained devices: microcontrollers and chips found in things like environmental sensors, LED wearables, smart watches, and IoT (Internet of Things) wireless gateways. The Zephyr OS is built around a small-footprint kernel, the core layer of the operating system, specifically engineered to use minimal memory and computing power. It supports a wide range of hardware architectures including ARM (Cortex-A, Cortex-R, and Cortex-M families), Intel x86, RISC-V, SPARC, MIPS, and others, as well as a large number of supported development boards. The project is built with security in mind and includes dedicated security documentation and an advisories repository. Topics listed include Bluetooth, Bluetooth LE (the low-energy variant used in wearables and IoT devices), embedded systems, and microcontrollers. The project is hosted under the Zephyr Project organization and offers community support through a Discord server, mailing lists, and a project wiki. Code samples and a Getting Started Guide are available in the documentation. The project is written primarily in C.