Thank you for purchasing the Radiomaster ER8 ELRS receiver. The ER8 receiver is based on the revolutionary ExpressLRS system. It offers high performance, high
reliability, flexible configuration, fast response speed and ultra-long range bringing you brand new experience with your hobby.
Product Features:
Power supply: DC 4.5 - 8.4V
Antenna type: 20cm high sensitivity antenna
Wireless protocol: ExpressLRS 3.2 pre-installed
Output channel: 8CH PWM
Telemetry power: maximum 100mw (LUA
Adjustable)
Battery voltage detection range: DC 4.0 - 35V
Bus interface: CRSF
Weight: 16.5 grams
Size: 43*30*15mm
Firmware:
Device Category: Radiomaster 2.4Ghz
Device: RadioMaster ER8 2400 PWM RX
Important:
1.The recommended ELRS LUA settings on the remote-control end are:
- Standard servos:
- Performance servos:
Packet Rate： 100Hz Full
Packet Rate： 333Hz Full
Telem Ratio： Std (1:128)
Switch Mode： 8ch
Telem Ratio： Std (1:32)（default if unsure）
Switch Mode： 8ch
1. The first time you power on your receiver, the LED will double blink. This indicates that the receiver is
in bind mode. If this is not the case, hold down the boot button for 10 seconds to reset the receiver.
2. Open the ExpressLRS LUA on your remote controller and select [BIND], then confirm.
3. A successful bind is indicated by the light being a steady on, indicating that frequency binding was
successful.
Note:
To bind the receiver a second time or to another radio, power cycle the receiver 3 times. On
the third power cycle, the LED will double blink indicating bind mode. If you cannot successfully enter
bind mode with the 3 power cycle method, you can hold down the boot button for 10 seconds to reset
the receiver to bind mode or use the passphrase method below.
WARNING:
All previous settings in the receiver will be erased and need to be set again when using the
reset button.
Binding method (Traditional):
1. Open the ExpressLRS LUA and navigate to the Wifi Connectivity page. Select the Enable
Wifi option and connect to your radios wifi with a mobile phone, tablet or PC (See TX Wifi
notes below). Open the WebUI (Express LRS web page on http://10.0.0.1/) and choose a
unique bind phrase. Note Bind phrases are not secret and can be read. Save and Reboot.
2. Power up the receiver and wait 60 seconds for the LED to blink rapidly to indicate Wifi
mode. Connect your phone, tablet or PC to the receivers Wifi (See TX Wifi notes below).
Open the WebUI (Express LRS web page on http://10.0.0.1/) and enter the matching bind
phrase previously entered on your radio. Note Bind phrases are not secret and can be read.
Save and Reboot. Once a radio and a receiver have the same bind phrase set they will
automatically bind.
TX Wifi notes：
WiFi default network name: ExpressLRS TX
WiFi default password: expresslrs
Default URL: http://10.0.0.1/ (Open in browser)
RX Wifi notes:
WiFi default network name: ExpressLRS RX
WiFi default password: expresslrs
Default URL: http://10.0.0.1/ (Open in browser)
Binding method (Passphrase).
ER
8
2: 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.
3: The EXT-V (external voltage input) of the ER8 is accessed via the EXT-V 2pin JST-GH connector.
The RED wire must be soldered to the positive of the battery or ESC. If no EXT-V power source is
found, the ER8 will default to reading the voltage on the receiver pins, only one voltage input can
be used at the any given time.
4: Please ensure that the power supply current of the ESC BEC matches the power consumption
requirements of the servo used. If using high-voltage and high-torque servos, it is recommended
to use a 2S 7.4V battery for direct power supply or a suitable high-current UBEC.
5: Calibration of the telemetry voltage will be required on your radio. Navigate to the telemetry
page on your radio and locate the RxBt sensor. Edit the sensor settings and adjust the offset until
the displayed reading matches the actual voltage of the battery in the model. If there is a large
difference, adjustment of the ratio may also be required.
6: ExpressLRS Arming requirements and the use of Channel 5: CH5 is required by ExpressLRS to set the Arm state of the RF module in your radio. It is
recommended to assign CH5 to a switch such as your throttle cut switch as this will provide benefits such as dynamic power. Using the ExpressLRS LUA
or the Wifi WebUI, you can assign different channels to the CH5 output of your receiver. See example to the right:
The Radiomaster ER8 receiver has been specially designed for fixed-wing users. It can drive up to 8 servos and has built-in receiver voltage telemetry
and flight battery telemetry with the ability to automatically detect which voltage input to use. A 4-wire CRSF interface is provided to facilitate later
expansion of telemetry sensors. The ER8 features a dual-antenna with telemetry power up to 100mw. The receiver shell adopts one-piece molding
process with high structural strength.
Please visit https://www.expresslrs.org/ to learn more on the importance of setting up arming.
RX TX
BOOT
CH1
CH2
CH3
CH4
CH5
CH6
CH7
Battery
4.5-8.4V
