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.

Flat Antenna V1.0 & V1.1

The ELRS Lite Receiver flat antenna V1.1 is coming to see you again. Range issues and failsafe at around 100 meters have been resolved compared with V1.0. Now, the V1.1 flat antenna receiver can reach 600 meters with BETAFPV Moxon TX Antenna (using BETAFPV Nano TX module).

Previously, the flat antenna V1.0 led to the failsafe at around 100 meters with an RSSI of -95dBm of this receiver, which did not reach the expected range compared with the beta version. However, it works great for indoor whooping and racing.

Specification

• Weight: 0.47g (with Tower SMD ceramic antenna), 0.53g (with Flat SMD ceramic antenna)
• Size: 10mm*10mm*6mm (Tower), 11mm*10mm*3mm (Flat)
• MCU: ESP8285
• Telemetry power: 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: Now the firmware version of the Lite receiver tower antenna or flat antenna v1.1 manufactured by our company is ELRS 3.3.0; ELRS Innovative team has officially released version 3.3.0. 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.

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.