Radiomaster ER8G ExpressLRS Receiver

Introduction

Thank you for purchasing the Radiomaster ER8G ExpressLRS receiver. The ER8G receiver is based on the revolutionary ExpressLRS system. It offers high performance, high reliability, flexible configuration, fast response speed, and ultra-long range. The ER8G Receiver has the same functionality as the ER8GV, but without a built-in Vario, making it suitable for competitions that prohibit Vario usage or for users who do not require this feature.

Important Notes

Recommended ELRS LUA Settings

Standard Servos

• Packet Rate: 100Hz Full
• Telem Ratio: Std (1:32) (default if unsure)
• Switch Mode: 8ch

Performance Servos

• Packet Rate: 333Hz Full
• Telem Ratio: Std (1:128)
• Switch Mode: 8ch

Voltage Input and Calibration

The maximum input voltage for the EXT-V (external voltage input) telemetry reading is 35V. Do not exceed 35V, or the receiver will be damaged.

The EXT-V input is accessed via the EXT-V solder pad on the PCB. A wire must be soldered to this pad and connected to the positive wire of the battery or ESC. If no EXT-V power source is found, the ER8G will default to reading the voltage on the receiver pins. Only one voltage input can be used at any given time.

Ensure the ESC BEC's power supply current matches the servo's power consumption requirements. For high-voltage, high-torque servos, a 2S 7.4V battery or a suitable high-current UBEC is recommended.

Telemetry voltage calibration is required on your radio. Navigate to the telemetry page, locate the RxBt sensor, edit its settings, and adjust the offset until the displayed reading matches the actual battery voltage. The ratio may also need adjustment if the difference is significant.

ExpressLRS Arming and Channel 5

ExpressLRS requires CH5 to set the Arm state of the RF module in your radio. It is recommended to assign CH5 to a switch (e.g., throttle cut) for benefits like dynamic power. Different channels can be assigned to the receiver's CH5 output using the ExpressLRS LUA or Wifi WebUI.

For more information on setting up arming, please visit: https://www.expresslrs.org/.

Product Overview

The Radiomaster ER8G receiver is designed for glider pilots needing a compact and slim receiver. It supports up to 8 servos and includes built-in receiver and flight battery telemetry, automatically detecting the voltage input (only one input usable at a time). The ER8G features dual antennas and telemetry power up to 100mw. It lacks a built-in altimeter, making it suitable for competitions where vario usage is prohibited. The ER8G can be powered by a 1S LiPo receiver battery.

Product Features

• Power supply: DC 3.5 - 8.4V
• Antenna type: 20cm high sensitivity dual antenna
• Wireless protocol: ExpressLRS 3.2 pre-installed
• Output channels: 8CH PWM
• Return power: maximum 100mw (adjustable via LUA)
• Battery voltage detection range: DC 4.0 - 35V
• Bus interface: CRSF
• Weight: 12 grams
• Dimensions: 60*13.5*13mm

Firmware

• Device Category: Radiomaster 2.4Ghz
• Device: Radiomaster ER8G

Connection Diagram

The diagram shows the ER8G receiver with its connections. The receiver has pins labeled CH1 through CH8, BATT, BOOT, and EXT-V. It also has RX and TX pins for communication. A battery connector (3.5-8.4V) is shown connected to the receiver. The diagram illustrates how to connect servos to the CH1-CH8 outputs. The EXT-V pin is shown for external voltage input, and the BATT pin is for receiver battery power.

Binding Methods

Traditional Binding

1. Power on the receiver for the first time; the LED will double blink, indicating bind mode. If not, hold the boot button for 10 seconds to reset.
2. Open the ExpressLRS LUA on your remote controller, select [BIND], and confirm.
3. A steady LED indicates successful binding.

Note: To bind a second time or to another radio, power cycle the receiver three times. On the third cycle, the LED will double blink. If this method fails, hold the boot button for 10 seconds to reset to bind mode, or use the passphrase method.

WARNING: Using the reset button will erase all previous settings.

Binding Phrase Method

1. Open the ExpressLRS LUA, navigate to the Wifi Connectivity page, and enable Wifi. Connect to your radio's Wi-Fi (see TX Wi-Fi notes). Open the WebUI (default address: http://10.0.0.1/) and enter a unique bind phrase. Save and reboot.
2. Power up the receiver and wait 60 seconds for the LED to blink rapidly (Wi-Fi mode). Connect your phone, tablet, or PC to the receiver's Wi-Fi (see TX Wi-Fi notes). Open the WebUI (default address: http://10.0.0.1/) and enter the same bind phrase used for the transmitter. Save and reboot. The transmitter and receiver will bind automatically when they share the same bind phrase.

Wi-Fi Network Details

Transmitter Wi-Fi

• Default Network Name: ExpressLRS TX
• Default Password: expresslrs
• Default URL: http://10.0.0.1/

Receiver Wi-Fi

• Default Network Name: ExpressLRS RX
• Default Password: expresslrs
• Default URL: http://10.0.0.1/