Nano Receiver
User Manual
Welcome to ExpressLRS!
BETAFPV Nano receiver is based on the ExpressLRS project, an open-source RC link for RC applications. ExpressLRS aims to achieve the best possible link performance in both speed, latency, and range. This makes ExpressLRS one of the fastest RC links available while still offering long-range performance.
Github Project Link: httos://github.com/ExpressLRS
Facebook Group: https://www.facebook.com/groups/636441730280366
Specifications
- Weight: 0.7g (receiver only)
- Size: 12mm*19mm
- Telemetry power: 20dbm
- Frequency bands (Nano receiver 2.4G version): 2.4GHz ISM
- Frequency bands (Nano receiver 915MHz/868MHz version): 915MHz FCC/868MHz EU
- Input voltage: 5V
- Antenna connector: I PEX MHF
Nano receiver 2.4G version diagram as shown below.
Nano receiver 868MHz/915MHz version diagram as shown below.
Nano receiver LED status indication is shown below.
| Indicator status | Meaning |
| Solide on | Connected successfully |
| Flash double quickly | Binding status |
| Flash slowly | Connection fail |
| Flash quickly | WIFI upgrade status |
Basic Configuration
httbs://github.com/ExpressLRS/ExpressLRS/wiki/OpenTX-andBetaflight-SetuD
ExpressLRS uses the Crossfire serial protocol (AKA CRSF protocol) to communicate between the receiver and the flight controller board. So make sure your flight controller board supports the CRSF serial protocol. Next, we use the flight controller with Betaflight firmware to show how to set up the CRSF protocol.
The connection between the ELRS Nano receiver and the FC board is shown below.
Enable the corresponding UART (e.g. UART3 below) as a Serial Rx on Betaflight Configurator “Ports” tab.
| Identifier | Configuration/MSP | Serial Rx |
| USB VCP |  |
 |
| UART1 |  |
|
| UART2 | |
|
| UART3 | |
 |
On the “Configuration” tab, select “Serial-based receiver” on the “Receiver” panel, and select “CRSF” as the protocol. Telemetry is optional here and will reduce your stick update rate due to those transmit slots being used for telemetry.
Bind
Nano receiver could enter binding status by power on/off three times.
- Plugin and unplug nano receiver three times;
- Make sure the LED is doing a quick double blink, which indicates the receiver is in bind mode;
- Make sure the RF TX module or radio transmitter enter binding status, which sends out a binding pulse;
- If the receiver has a solid light, it’s bound.
Note: Binding once and the receiver will store the binding information. Re-power and the connect successfully auto.
More Information
As the ExpressLRS project is still an infrequent update, please check BETAFPV Support (Technical Support -> ExpressLRS Radio Link) for more details and the newest manual.
https://support.betafpv.com/hc/en-us
- Newest user manual;
- How to upgrade the firmware;
- FAQ and troubleshooting.
Documents / Resources
 |
BETAFPV 1873790 Nano Receiver 2.4GHz ISM 5V Input Voltage [pdf] User Manual 1873790, Nano Receiver, 2.4GHz ISM 5V Input Voltage, 1873790 Nano Receiver 2.4GHz ISM 5V Input Voltage |
