ER8 Receiver User Manual
1
Recommended: ELRS Lua Calibration: Telemetry Calibration: Sensors Bind
1 5 5
2
BOOT
EXT-V
boot
ANTENNA
15mm
(20mm)
CH3
CH4
CH1
CH2
CH5
CH6
CH8
CH7
BATT
CH3
CH4
CH5
CH6
CH7
CH8
CH1
CH2
BATT
Battery
4.5-8.4V
43mm
30mm
2
TX & RX WIFI INFO
WIFI Network : ExpressLRS TX
WIFI Password: expresslrs
URL: http://10.0.0.1/ (Open in browser)
TOP
BACK
16.5
GRAMS
2.4
GHZ
+
RX TX
-
+-
Expres sLRS 2.4
Radiomaster ER6 ELRS 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 100
mw.
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 of the ER6 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 ER6 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. Cali bration of the telemetry voltage will be requir
ed 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. *For best results calibrate the
voltage of your radio using a fully charged b
attery of the correct cell count
intended for use in the model.
6: ExpressLRS Arming requirements and the use of Channel 5. The ER4 receiver
has 4 channels and does not require any channel outputs to be re-mapped
however it is still recommended to assign Channel 5 on your radio to a switch
such as your throttle cut switch so the RF module in your radio can be armed
and disarmed
which will provide benefits such as dynamic power. Please visit
https://www.expresslrs.org/ to learn more on the importance of setting up arming.
CH1 : C H1
CH2 : C H2
CH3 : C H3
CH4 : C H4
CH5 : C H9
CH6 : C H6
CH7 : C H7
CH8 : C H8
SPECIFICATIONS
•Size: 43*30*15mm
•Weight: 16.5g
•Power Supply: DC 4.5 - 8.4V
•Antenna Type: 20cm (High Sensitivity Antenna)
•Wireless Protocol: ExpressLRS 3.3.0 (pre-installed)
•Output Channel: 8CH PWM
•Telemetry Power: max. 100mw (LUA Adjustable)
•Bus interface: CRSF
•Telemetry Battery voltage detection range: DC 4.0 - 35V
FIRMWARE
Device Category: Radiomaster 2. 4Ghz | Device: RadioMaster ER8 2400 PWM RX
PASSPHRASE BINDING
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 info above). OPEN the ExpressLRS web page at (http://10.0.0.1/)
and choose a unique bind phrase. Save and Reboot.
2. Power ON the receiver an
d wait 60 seconds for the LED to blink rapidly to indicate
WIFI mode. Connect your phone, tablet or PC to the receivers WIFI (See RX WIFI
info above). OPEN the ExpressLRS web page at (http://10.0.0.1/) and enter the
matching bind phrase previously entered on your radio. Save and Reboot. Once both
radio and receiver have the same bind phrase set they will automatically bind.
TRADITIONAL BINDING
1. The first time you power on your receiver, the LED is doing a quick double blink,
which indicates 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. Power ON your transmitter/radio and use the [BIND] button on the ExpressLRS Lua
script, which sends out a binding pulse.
3. If the receiver has a sol id ligh
t, it's bound!
*Note: To bind 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 mo
de or use the passphrase method. WARNING: All previous settings in the
receiver will be erased and need to be re-entered when using the reset button.
SET-UP
1. The recommended ELRS LUA settings on the remote-control end are:
Standard servos:
Packet Rate 100Hz Full
Telem Ratio Std (1:32)ʢ default
ʣ
Switch Mode 8ch
Performance servos:
Packet Rate 333Hz Full
Telem Rat
io Std (1:128)
Switch Mode 8ch
IMPORTANT
(*Note: Bind phrases are not secret and can be read.)
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