RADIOMASTER ER4 Receiver User Manual

ER4 Receiver User Manual

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

SET-UP

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

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 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 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 battery 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.

SPECIFICATIONS

• Size: 30155mm
• Weight: 3g
• Power Supply: DC 4.5 – 8.4V
• Antenna Type: 15cm (High Sensitivity Antenna)
• Wireless Protocol: ExpressLRS 3.3.0 (pre-installed)
• Output Channel: 4CH PWM
• Telemetry Power: 10mw

FIRMWARE

Device Category: Radiomaster 2.4Ghz
Device: RadioMaster ER4 2400 PWM RX

PASSPHRASE BINDING

(*Note: Bind phrases are not secret and can be read.)

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 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 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 solid light, 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 mode 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.

References

• High Performance Open Source Radio Control Link - ExpressLRS

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>