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Table of contents
Zephyr OS Overview and Key Features
Zephyr's Architecture
Frequently Asked Questions
What hardware does Zephyr OS support?
Is Zephyr OS only for IoT devices?
What programming language is used to develop applications in Zephyr?
Last Updated: Mar 27, 2024

Zephyr Operating System

Author Gunjan Batra
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Anubhav Sinha
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The Internet of Things (IoT) represents a significant shift in how devices communicate and operate. As part of this new landscape, we need operating systems tailored for IoT devices. The Zephyr Operating System is one such solution.

Zephyr is an open-source, real-time operating system (RTOS) designed for use on resource-constrained systems, from simple embedded environmental sensors and LED wearables to sophisticated smart watches and IoT wireless gateways. 

Zephyr Operating System

This article aims to give you a thorough introduction to the Zephyr OS, its architecture, and its usage.

Zephyr OS Overview and Key Features

Zephyr OS is small, scalable, and comes with features that allow developers to create reliable and complex IoT applications. It supports a broad range of hardware, including x86, ARM, and RISC-V architectures. Zephyr OS also boasts multi-protocol network stacks and supports Bluetooth LE and Wi-Fi connectivity, making it ideal for many IoT use cases.

Zephyr's Architecture

Zephyr's architecture is modular and based on a small microkernel designed for use on systems with as little as 8KB of memory. This microkernel provides basic services such as thread management and inter-thread synchronization. Here's a simplified view of Zephyr's architecture:

  • Layer Description
  • Hardware Physical devices on which Zephyr runs
  • Kernel Handles thread management and synchronization
  • Services Includes drivers, file systems, and network stacks
  • Application User-level applications running on Zephyr
  • Programming with Zephyr

Zephyr applications are written in C. Let's look at a simple "Hello, World!" application in Zephyr:

#include <zephyr.h>
#include <misc/printk.h>

void main(void)
    printk("Hello World!\n");

This application includes two Zephyr headers. zephyr.h is a catch-all header that includes other essential Zephyr headers. printk.h is for the printk function, similar to the printf function in standard C, which writes output to the console.

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Frequently Asked Questions

What hardware does Zephyr OS support?

Zephyr supports a wide range of hardware architectures, including x86, ARM, RISC-V, ARC, XTENSA, and others. It's designed to be hardware agnostic.

Is Zephyr OS only for IoT devices?

While Zephyr is ideal for IoT due to its small footprint and features, it can also be used for other embedded systems beyond just IoT devices.

What programming language is used to develop applications in Zephyr?

Zephyr applications are generally written in C, but support for C++ and other languages is possible using appropriate runtime libraries.


Zephyr OS stands out as a powerful, scalable, and flexible operating system ideal for IoT and other embedded devices. Its architecture enables it to run on a variety of hardware, making it a versatile choice for developers in the embedded and IoT spaces. Whether you're developing a small sensor application or a complex IoT gateway, Zephyr offers the features, scalability, and support you need. The future of IoT is here, and with Zephyr, developers have an excellent tool to bring their innovations to life.

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