BETAFPV Lite 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 speeds, latency, and range. This makes ExpressLRS one of the fastest RC links available while still offering long-range performance.
Flat Antenna
New lite receiver with a flat antenna features a 3mm extra-thin board and 0.53g lightweight, which requires less assembly space on drones with limited space. Besides, solid flat antenna without irregular parts can withstand crashes, making the receiver not so fragile.
Whatever tower antenna or flat antenna, both versions perform well in control, range and stability, bringing a good flight experience to pilots. Below chart is the basic information for two antennas. It is shown that both antennas have almost the same performance in gain. However, the efficiency for flat antenna is better than tower antenna. In spite of that, tower antenna and flat antenna V1.1 can reach about 600 meters by equal conditions.
Flat Antenna V1.1
The ELRS Lite Receiver flat antenna V1.1 is coming to see you again. with extended range out to 600 meters, this is perfect for racers and whoops.
Specification
Weight: 0.53g (with Flat SMD ceramic antenna)
Size: 11mm*10mm*3mm (Flat)
MCU: ESP8285
Telemetry power:Â 17mW
Frequency bands (Nano receiver 2.4G version): 2.4GHz ISM
Input voltage: 5V
Antenna: Integrated SMD ceramic antenna
Diagram
Lite receiver with flat antenna 2.4G version diagram as shown below.
Note: For orders before April 2022, the firmware version of the Lite receiver flat antenna v1.1 manufactured by our company is ELRS 2.0.0; ELRS Innovative team has officially released version 2.4.0. If you want to flash ELRS official firmware, please download the latest ExpressLRS-Configurator or read our manual for flashing it. Significantly, the TX module and receiver have to be in the same ELRS version, otherwise, the frequency cannot match successfully.
ExpressLRS is an open-source RC link for RC applications. Everyone could find this project on Github or join the discussion in Facebook Group.
ExpressLRS is based on Semtech Lora SX127x or SX1280 hardware for RX and TX respectively. it aims to achieve the best possible link performance in both speeds, latency, and range. At 900 MHz a maximum of 200 Hz packet rate is supported. At 2.4 GHz a blistering 500Hz is currently supported with a custom OpenTX build. This makes ExpressLRS one of the fastest RC links available while still offering long-range performance.
More and more vendors start to support the ExpressLRS radio protocol in different parts, like radio transmitter with ELRS in stock, drone with built-in ELRS receiver, ELRS TX module for JR bay, or Nano bay. BETAFPV team take part in this project and provide a series of ExpressLRS components.
Configuration & Bind
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 Lite 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.
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.
The Lite receiver comes with offically major release V2.0.0 protocol and no Binding Phrase inlcuded. Lite receiver could enter binding status by power on/off three times.
Plugin and unplug Lite 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.
Note: If you reflash firmware of the receiver with your own Binding Phrase, please make sure the TX module has the same Binding Phrase. The RF TX module and the receiver will bind automatically in this situation.
Considering customers who fly tiny whoops indoors or with a short range, less than 100m, the Lite Receiver Flat Antenna V1.0 will be compatible with their needs. If you would like to fly drones with long-range, please choose Tower Antenna or V1.1 Flat Antenna.
Package
1 * BETAFPV ELRS Lite receiver (flat antenna V1.1)
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