# ExpressLRS

> Open radio protocoll for long range modell RC

**Wikidata**: [Q109808045](https://www.wikidata.org/wiki/Q109808045)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/ExpressLRS)  
**Source**: https://4ort.xyz/entity/expresslrs

## Summary
ExpressLRS (ELRS) is an open-source radio protocol designed for long-range control of model remote-controlled (RC) vehicles. It enables high-performance communication between transmitters and receivers using frequencies such as 2.4 GHz, 868 MHz, and 915 MHz. Built on open-source and open-hardware principles, ELRS supports customizable firmware and community-driven development.

## Key Facts
- Instance of: Communication protocol, open-source software, open hardware
- Aliases: ELRS
- License: GNU General Public License v3.0
- First release: Version 1.0.0 published on July 17, 2021
- Latest version (as of October 2022): 2.3.0 (released March 8, 2022)
- Supported frequencies: 2.4 GHz, 868 MHz, 915 MHz
- Website: https://www.expresslrs.org (in English)
- Source code repository: https://github.com/ExpressLRS/ExpressLRS
- Discord server ID: dS6ReFY
- Facebook page ID: 636441730280366
- Copyright status: Copyrighted

## FAQs
### Q: What is ExpressLRS used for?
A: ExpressLRS is used as a radio communication protocol for long-range remote control of RC models like drones and cars. It provides low-latency, reliable telemetry and control through open-source firmware.

### Q: Is ExpressLRS free to use?
A: Yes, ExpressLRS is open-source software released under the GNU GPL v3.0 license, making it freely available for use, modification, and redistribution.

### Q: Which frequencies does ExpressLRS support?
A: ExpressLRS operates on multiple ISM bands including 2.4 GHz, 868 MHz, and 915 MHz, allowing global usage depending on regional regulations.

## Why It Matters
ExpressLRS plays a significant role in the RC hobbyist and drone communities by offering a high-performance, customizable alternative to proprietary radio systems. Its open-source nature allows users to inspect, modify, and optimize performance while benefiting from active community contributions. By supporting long-range communication with low latency and robust telemetry features, ELRS enhances both recreational and professional applications in FPV racing, aerial photography, and precision control scenarios. The project also promotes innovation through shared development resources and cross-platform compatibility across various hardware platforms.

## Notable For
- Being one of the few fully open-source protocols tailored specifically for long-range RC model control
- Supporting multiple international frequency bands (2.4 GHz, 868 MHz, 915 MHz) within a single ecosystem
- Rapid iterative development with frequent stable releases since initial launch in mid-2021
- Strong integration with DIY electronics culture via open hardware designs and programmable firmware

## Body
### Overview
ExpressLRS (also known as ELRS) is a digital radio link system optimized for remote-controlled aircraft and ground vehicles. Designed primarily for long-range operation, it delivers fast response times and advanced telemetry capabilities over standard ISM band frequencies.

### Development & Licensing
The project was initiated around mid-2021 and has been developed collaboratively under the GNU General Public License version 3.0. This ensures that all source code remains publicly accessible and redistributable. The official source code repository can be found at GitHub: [https://github.com/ExpressLRS/ExpressLRS](https://github.com/ExpressLRS/ExpressLRS).

### Releases and Version History
Since its first public release (version 1.0.0), ExpressLRS has maintained a rapid update cycle:
- **Version 1.0.0** – Released July 17, 2021
- **Version 2.0.0** – Introduced major improvements; released December 11, 2021
- **Version 2.3.0** – Last documented stable release; published March 8, 2022

Each version includes bug fixes, feature enhancements, and expanded device compatibility.

### Technical Specifications
ExpressLRS functions across several widely adopted unlicensed radio bands:
- **2.4 GHz**: Commonly used worldwide for general-purpose RC links
- **868 MHz / 915 MHz**: Preferred in Europe and North America respectively for extended range operations

These multi-band options allow flexibility based on local regulatory requirements and environmental conditions.

### Community and Support
Support for ExpressLRS comes largely from its engaged online community. Official channels include:
- A dedicated website ([expresslrs.org](https://www.expresslrs.org))
- Active presence on social media (Facebook group with ID 636441730280366)
- Real-time interaction via Discord (server ID: dS6ReFY)

This collaborative environment encourages continuous improvement and user feedback loops, which contribute significantly to the platform’s evolution and adoption rate among enthusiasts and professionals alike.

## References

1. [GitHub](https://github.com/ExpressLRS/ExpressLRS/blob/master/LICENSE)
2. [Release 1.0.0. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/1.0.0)
3. [Release 1.0.1. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/1.0.1)
4. [Release 1.1.0. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/1.1.0)
5. [Release 1.2.0. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/1.2.0)
6. [Release 1.2.1. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/1.2.1)
7. [Release 2.0.0. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.0.0)
8. [Release 2.0.1. 2021](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.0.1)
9. [Release 2.1.0. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.1.0)
10. [Release 2.2.0. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.2.0)
11. [Release 2.3.0. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.3.0)
12. [Release 2.4.0. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.4.0)
13. [Release 2.5.0. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.5.0)
14. [Release 2.5.1. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.5.1)
15. [Release 3.0.0. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.0.0)
16. [Release 3.0.1. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.0.1)
17. [Release 3.1.1. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.1.1)
18. [Release 3.1.2. 2022](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.1.2)
19. [Release 2.5.2. 2023](https://github.com/ExpressLRS/ExpressLRS/releases/tag/2.5.2)
20. [Release 3.2.0. 2023](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.2.0)
21. [Release 3.2.1. 2023](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.2.1)
22. [Release 3.3.0. 2023](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.3.0)
23. [Release 3.3.1. 2023](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.3.1)
24. [Release 3.3.2. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.3.2)
25. [Release 3.4.0. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.4.0)
26. [Release 3.4.1. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.4.1)
27. [Release 3.4.2. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.4.2)
28. [Release 3.4.3. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.4.3)
29. [Release 3.5.0. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.0)
30. [Release 3.5.1. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.1)
31. [Release 3.5.2. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.2)
32. [Release 3.5.3. 2024](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.3)
33. [Release 3.5.4. 2025](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.4)
34. [Release 3.5.5. 2025](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.5)
35. [Release 3.5.6. 2025](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.5.6)
36. [Release 3.6.0. 2025](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.6.0)
37. [Release 3.6.2. 2025](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.6.2)
38. [Release 3.6.3. 2026](https://github.com/ExpressLRS/ExpressLRS/releases/tag/3.6.3)
39. [Release 4.0.0. 2026](https://github.com/ExpressLRS/ExpressLRS/releases/tag/4.0.0)