RADiOMASTER ER4 ELRS PWM Receiver Instructions

ER4 ELRS PWM Receiver
Instructions

ER4 ELRS PWM Receiver

Thank you for purchasing the Radiometer ER4 Expresser’s receiver. The ER4 receiver is based on the revolutionary Expresser’s system. It offers high performance, high reliability, flexible configuration, fast response speed and ultra-long range bringing you brand new experience with your hobby.

Important:

1. The recommended ELRS LUA settings on the remote-control end are:
   Standard servos:

   Packet Rate:| 100Hz Full
   Teem Ratio:| Std (1:32) (default if unsure)
   Switch Mode:| 8ch
   – Performance servos:
   Packet Rate:| 333Hz Full
   Teem Ratio:| SD (1:128)
   Switch Mode:| 8ch

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 ER4 is accessed via the EXT-V solder pad on the PCB. A single 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 ER4 will default to reading the voltage on the receiver pins, only one voltage input can be used at the any given time.

4. If the power supplied is 7.4V or higher, please ensure that the receiver is in an open and ventilated area of the model for better heat dissipation.

5. Calibration of the telemetry voltage will be required on your radio. Navigate to the telemetry page on your radio and locate the Rabat 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. Express LRS 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 CH5 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.

The Radiometer ER4 receiver can drive 4 servos simultaneously. Designed with a very small volume, it is suitable for small aircraft models, ship models, car models and other models that require a small or lightweight receiver while still providing full range.

Product Features:

Power supply: DC 4.5 – 8.4V
Antenna type: 15cm high sensitivity antenna
Wireless protocol: ExpressLRS 3.2 pre-installed
Output channel: 4CH PWM
Telemetry power: 10mw
Battery voltage detection range: DC 4.0 – 35V
Weight: 3.0 grams
Dimensions: 30155mm

Firmware:
Device Category: Radiometer 2.4Ghz
Device: Radiometer ER4 2400 PWM RX

Binding method (Traditional):

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 (Passphrase).

1. Open the ExpressLRS LUA and navigate to the Wi-Fi Connectivity page. Select the Enable Wi-Fi option and connect to your radios Wi-Fi with a mobile phone, tablet or PC (See TX Wi-Fi notes below). Open the WEDU (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 Wi-Fi mode. Connect your phone, tablet or PC to the receivers Wi-Fi (See TX Wi-Fi notes below). Open the WEDU (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 Wi-Fi notes：
Wi-Fi default network name: ExpressLRS TX
WIFI default password: ExpressLRS
Default URL: http://10.0.0.1/ (Open in browser)
RX Wi-Fi notes:
WIFI default network name: ExpressLRS RX
Wi-Fi default password: ExpressLRS
Default URL: http://10.0.0.1/ (Open in browser)

References

• High Performance Open Source Radio Control Link - ExpressLRS

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