And as in the drone and R/C models world, stable communication is a lifeline. The ELRS modules have become a new trend in solution for people who would like the best performance at an excellent price point.
In this complete guide, I will cover in detail about the ELRS modules – What is it, Features of Telemetry Unit, what type does it comes with and other useful reference getting started. We apprecieate a lot if you buy ELRS modules or other FPV parts or kits at MEPSKING drone shop.
What is an ELRS Module?
The piece of electronic device that is fitted onto your remote controller or drone would be an ELRS module, allowing it communicate into the ExpressLRS Radio System. Choose FPV drone radio receivers from MEPSKING for reliable signal and responsive control.
Built as an alternative to high performance radio control systems, ExpressLRS is designed for the neediest case of 5ms speed at all time and long range. In sharp contrast to the use-locked hardware of proprietary traditional radio systems, ExpressLRS leverages an open-source code that is freely accessible and can be modified by anyone who has access to a compiler or hex file above version 2.0/0x00200000 bits within their transmitter firmware flash space.
Benefits of ELRS Modules
Benefits of ELRS modules compared to regular radio protocols
- Speed ExpressLRS is faster at up to 500 hz than most radio systems. The KingKong 90GT still possesses the same levels of control as before, leading to increased response times and really giving you a smooth experience in flight when carrying out acrobatics or aggressive maneuvers.
- Latency, with its extended 255 bytes buffer and low latency channel scheduler, ExpressLRS has guaranteed the minimal delay between your transmitter move and response of aircraft. This is important to ensure safe and accurate flight, particularly in challenging environments or at high speeds.
- Yet, ExpressLRS offers some spectacular range with many users reporting that the system works at greater distances than traditional solutions. This enables extended flights and the ability to cover more ground, increasing flight options.
- Cost: In general, ELRS modules are less expensive than other high-performance radio systems making it an exceptional price to performance point.
- Open Source: We enable a transparent, collaborative and ongoing system development via the open-source nature of ExpressLRS. As we know the Developers Community are all set to maintain and improve its features meeting with ongoing need.
Types of ELRS Modules
ELRS modules are divided into two families.
- TX Module(Transmitter): This is the module which will be in remote controller and functions of this modult are sending signals to drone.
- RX Module (Receiver): Mounted on the aircraft, used to receive control signals from a remote control and sent back telemetry data.
There are several frequency and power variants of ELRS modules for different requirements, according to local laws. Choosing the proper combination is crucial for best performance and to meet necessary regulations.
How an ELRS System Works
The whole package of ELRS comprises a TX module on the remote control, RX module on the drone with respective antennas. When the system is switched on, it links RX module with TX moduele created for aeration as per communication channel.
The physical control commands to the tri-rotor are provided using a remote-control handset by the pilot. The TX module encodes these and sends them to the RX modue over radio waves. The RX takes the signals, decodes them and sends it to drone flight controller. The commands are are in turn interpreted by the flight controller and drive actions to control motors which manipulate other (drone components) like, etc.
The RX module also gathers telemetry information from the drone, including battery voltage, altitude, speed and many others. Then this is passed on to TX where it is shown on a remote control giving the pilot real-time updates about how well off his drone is.
More Components Of An ELRS System
Apart from TX and RX modules, there are other parts in an ELRS system that make it a complete package:
- Repeaters: Responsible for enhancing the radio signal, thereby expanding the range of operation of the system, they are especially beneficial in environments with hindrances or during long-haul flights.
- OSD (On-Screen Display): Displays telemetry information immediately on the transmitter monitor, thus giving real-time feedback about the drone’s status.
- Smart Battery: Delivers precise data about battery charge levels, thus enhancing flight safety and management.
Frequency Bands Supported by ExpressLRS
There are two primary frequency bands that can be used with ExpressLRS modules:
- 2.4 GHz: The most widely utilized band for FPV since it is small-sized, consumes low power and is user friendly. ExpressLRS 2.4GHz provides ultra-low latency including refresh rates of up to 500Hz while covering several kilometers with relatively tiny output power.
- 900 MHz: This band has longer range than 2.4 GHz, better penetrates obstacles and is less interference-prone from other electrical signals. The 900MHz variant of ExpressLRS provides a 200Hz refresh rate.
Additionally besides these two main ranges, some low power secondary bands supported by express LRS include;
- 433 MHz: This band has the furthest distance but comes at a cost of higher latency alongside larger modules.
- 868 MHz: This frequency band works well in certain regions where the use of 2.4 GHz frequencies is reduced because of legal restrictions
The availability of frequency bands vary by country or region; therefore one should always check local regulations before choosing a frequency band for their ExpressLRS system.
Popular ELRS Module Models
Some models with the highest popularity include:
- BETAFPV Micro TX Module: These are super tiny and so light that they can fit into any small drone. They are available in two frequencies – 2.4 GHz and 868 MHz.
- HappyModel ES24TX Module: This one is also an excellent small drone option since it has almost similar performance to the BETAFPV Micro TX but comes in different sizes.
- TBS Nano NanoTX Module: Best suited for racing or freestyle drones due its size and weight which suit it perfectly even during competitions.
- Jumper AION 2.4GHz Nano ELRS TX Module: The Jumper AION Nano ELRS Tx Module, based on the ExpressLRS project, offers a reliable long-distance link with a 500Hz refresh rate, adjustable power, and WiFi updates. Operating on 2.4GHz, it surpasses traditional RC systems with shorter antennas.
- Alternatively, there is also the RadioMaster Boxer with an integrated 2.4 GHz ELRS module, which is, in my opinion, the best and most practical choice for transporting things with minimal bulk.
Thus apart from TX modules, ELRS has receivers, antennas and other accessories as well.
My Opinion
Right now I am suggesting ELRS modules because they are perfect for drone pilots who want a quick, trustworthy, adjustable and cost-effective RC system. ELRS is likely to flourish over the next few years as its popularity continues increasing.
However, it is worth noting that ELRS is still a relatively new and evolving project. This implies that there might be some occasional bugs or problems. But the ELRS community is very much alive and always tries to improve this system.
If you are considering switching over to ELRS, then it’s high time you did some research on it and got acquainted with the system. There are online resources like official ELRS website, forums and YouTube videos.
With just little knowledge and energy, you can have your ELRS up and running in very short time. This way you can have faster, reliable and more versatile RC systems at your disposal.