ELRS Receiver and RF Module LED Indicators

I. Receiver LED Indicators

1.1 RGB LED Indicators (SkyGuy Nano 2G4)

The SkyGuy Nano 2G4 receiver is equipped with an RGB LED that indicates the current status through different colors and blinking patterns.

Status	LED Effect	Description	Solution
Receiver Booting		Rainbow gradient animation, firmware starting	Normal behavior, wait for boot to complete
Receiver Waiting for Transmitter Connection		Red slow flash (500ms cycle)	Check if transmitter is powered on, if binding has been completed, or if distance is too far
Receiver Connected to Transmitter		Solid (color changes based on packet rate, see table below)	Normal operating state, no action required
Receiver Binding Mode		Orange-red double flash (1.3s cycle)	Initiate binding from the transmitter end simultaneously, or exit binding mode
Receiver WiFi Update Mode		Green heartbeat	Connect to receiver WiFi hotspot for firmware update, or wait for timeout to auto-exit
Receiver Model Mismatch with Transmitter		Orange-red triple flash (1.5s cycle)	Check and reconfigure model ID in ExpressLRS Lua script
Receiver RF Failure		Red fast flash (200ms cycle)	Check if receiver antenna is properly connected, identify and eliminate interference sources

1.2 Monochrome LED Indicators

Status	LED Effect	Description	Solution
Connected to Transmitter		Solid	Normal operating state, no action required
Receiver Waiting for Transmitter Connection		Slow flash (500ms cycle)	Check if transmitter is powered on, if binding has been completed, or if distance is too far
Receiver WiFi Update Mode		Fast flash (25ms cycle)	Connect to receiver WiFi hotspot for firmware update, or wait for timeout to auto-exit
Receiver RF Failure		Medium flash (100ms cycle)	Check if receiver antenna is properly connected, identify and eliminate interference sources
Receiver Binding Mode		Double flash then pause	Initiate binding from the transmitter end simultaneously, or exit binding mode
Receiver Model Mismatch with Transmitter		Triple flash then pause	Check and reconfigure model ID in ExpressLRS Lua script

II. Transmitter LED Indicators

RGB LED Indicators (CoreWing Sirius 2G4)

Status	LED Effect	Description	Solution
Transmitter Booting		Rainbow gradient animation	Normal behavior, wait for boot to complete
Transmitter Connected to Receiver		Solid (color changes based on packet rate, see table below)	Normal operating state, no action required
Transmitter Waiting for Connection		Monochrome gradient (color indicates packet rate)	Check if receiver is powered on, if binding has been completed
Transmitter Binding Mode		Orange-red double flash then pause	Initiate binding from the receiver end simultaneously, or exit binding mode
Transmitter WiFi Update Mode		Green heartbeat	Connect to transmitter WiFi hotspot for firmware update, or wait for timeout to auto-exit
Transmitter Bluetooth Controller Mode		Blue heartbeat	Normal behavior, Bluetooth controller mode has been enabled
Transmitter No Controller Connected		Orange flash once per second	Check controller connection, ensure controller is properly inserted into transmitter
Transmitter Model Mismatch with Receiver		Orange-red triple flash then pause	Check and reconfigure model ID in ExpressLRS Lua script
Transmitter RF Failure		Red flash (100ms on/off)	Check if transmitter antenna is properly connected, identify and eliminate interference sources

Tips

When the receiver or transmitter has RGB LED indicators and is successfully bound, the RGB LED color will change based on the current packet rate:

2.4GHz Band:

Packet Rate	F1000	F500	D500	D250	333 Full	500	250	150	100 Full	50
LED Effect

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