Quick Answer
Binding an ELRS receiver pairs it with your radio transmitter so they communicate on the same channel. Power on the receiver, put it in binding mode (usually a button press or power cycle), then select "Bind" from your radio's ELRS Lua script. The LED will turn solid when paired.
What You Need Before Binding
Before you start the binding process, make sure you have three things ready: a compatible ELRS radio transmitter, an ELRS receiver installed in your drone, and a way to power the receiver (either through the flight controller or a USB connection).
Most modern ELRS receivers use the 2.4GHz band and are cross-compatible between brands. A Happymodel EP1 receiver works just as well with a Radiomaster or Jumper radio as it does with a Happymodel transmitter. The protocol is universal across the ELRS ecosystem.
If you are unsure which receiver to choose, check out our guide on what ELRS is and why it has become the FPV radio standard for background on the system.
Step-by-Step Binding Process
The binding process follows the same basic sequence regardless of which receiver or radio you use. Here is how to do it:
Step 1: Power off your radio transmitter completely. Do not just put it to sleep.
Step 2: Power on the receiver. If your receiver has a bind button, press and hold it for three seconds until the LED starts flashing rapidly. If there is no button, the receiver may enter bind mode automatically after a set number of power cycles (check your receiver's manual).
Step 3: Power on your radio transmitter. Open the ELRS Lua script (usually found under the Tools or Special Functions menu). Select "Bind" from the menu.
Step 4: Wait a few seconds. The receiver LED will change from flashing to solid, indicating a successful bind. The Lua script will confirm the connection.
Step 5: Verify the bind by checking that channel values respond in the Lua script or in Betaflight's receiver tab.
Troubleshooting Common Binding Issues
If the receiver LED keeps flashing and never goes solid, check these common causes:
Wrong protocol version: ELRS receivers and transmitters need to be on compatible firmware versions. If your radio is running ELRS 3.x and your receiver is on 2.x (or vice versa), binding may fail. Update both to the same major version using the ELRS configurator or through WiFi flashing.
Receiver not in bind mode: Some receivers require a specific number of rapid power cycles (usually three to five) to enter bind mode. Watch the LED pattern: a slow blink is normal operation, a fast blink means bind mode is active.
Radio too close or too far: During binding, keep the radio about one to two metres from the receiver. Being too close can overload the receiver, while being too far may cause the signal to drop.
For more advanced configuration after binding, including setting up telemetry and adjusting packet rates, see our guide on ELRS telemetry setup.
Choosing the Right ELRS Receiver
Not all ELRS receivers are the same. The main differences are in antenna type, output power, and physical size:
| Feature | Standard Receivers | High-Power Receivers |
|---|---|---|
| Output Power | 25-50mW | 100-250mW |
| Range | Up to 1km | Several kilometres |
| Antenna | PCB or small whip | External SMA |
| Best For | Whoops and micros | Long-range builds |
For most freestyle and racing builds, receivers like the Radiomaster RP1 V2 offer a good balance of size and range. Long-range pilots should consider a receiver with an external antenna connection. Browse our full selection in the radio receivers collection.
FAQ
Q: Do I need to rebind my ELRS receiver after updating firmware?
A: Usually no. ELRS stores the binding information in persistent memory, so a firmware update will not erase it. However, if you change the major version (for example from 2.x to 3.x), rebinding may be necessary.
Q: Can I bind multiple receivers to one radio?
A: Yes. ELRS supports model profiles, so you can bind different receivers to the same radio and switch between them by selecting the appropriate model in your transmitter.
Q: How do I know if my receiver supports diversity?
A: Diversity receivers have two antenna connections. Check the product specifications or look for two U.FL or IPEX connectors on the board. A single-antenna receiver like the EP1 does not have diversity.
Q: What is the difference between ELRS and Crossfire binding?
A: Crossfire receivers bind using a separate CRSF protocol and require a Crossfire module. ELRS uses its own open-source protocol with a simpler binding procedure through the Lua script.