1. Introduction
The HelloRadioSky HR7E receiver is a high-performance, high-reliability, and ultra-long-range 2.4GHz ELRS PWM receiver designed specifically for fixed-wing aircraft, remote control drones, and model airplanes. Based on the revolutionary ExpressLRS system, it offers flexible configuration, fast response speed, and advanced features to enhance your model aircraft experience.
This manual provides detailed instructions for the setup, operation, and maintenance of your HR7E receiver.
2. Product Overview
The HR7E receiver features a compact design with clearly labeled ports and indicators. It is equipped with dual high-sensitivity antennas for reliable signal reception.
This image shows the key components of the HR7E receiver, including the BOOT key for firmware updates, an LED indicator for status, a telemetry voltage port, a UART port for data communication, and S+ S- pins for power and signal connections.
The pinout diagram illustrates the connections for up to 7 PWM servo channels (CH1-CH7) and a dedicated CH8 port which supports CRSF/S.BUS protocols for advanced control and telemetry.
This image highlights the receiver's 1800mm high-sensitivity dual antennas, protected by silicone for durability, and the 2.54mm header pins designed for low resistance connections.
Video 2.1: HelloRadio HR7E ELRS PWM Receiver Overview. This video provides a visual introduction to the HR7E receiver and its features.
3. Specifications
The following table details the technical specifications of the HelloRadio HR7E ELRS PWM 7CH Receiver:
| Feature | Specification |
|---|---|
| Product Model | HR7E 2.4GHz ELRS PWM Receiver |
| Power Supply | DC 4.5-8.4V |
| Antenna Type | 18cm high-sensitivity dual antennas |
| Wireless Protocol | Pre-installed ExpressLRS 3.3.0 |
| Output Channels | 8CH PWM (supports up to 7 servos) |
| Return Power | Up to 100mW (adjustable in LUA) |
| Return Battery Voltage Detection Range | DC 4.0-35V |
| Bus Interface | CRSF (4-wire for sensor expansion) |
| Weight | 10 grams |
| Dimensions | 48 x 25 x 15 mm |
| Material | Composite Material |
| Is Electric | No Battery |
4. Package Contents
The package includes:
- 1x HelloRadio HR7E 2.4GHz ELRS PWM Receiver
5. Setup
5.1. Frequency Alignment (Binding)
To establish a connection between your remote control and the HR7E receiver, follow these traditional binding steps:
- When the receiver is powered on, the LED light will turn on. Immediately cut off the power.
- Repeat the above step (power on, LED on, cut power) two more times.
- When the receiver is powered on for the third time, the LED light will flash twice, indicating that it has entered the frequency synchronization (binding) mode.
- On your remote control, select the BIND operation to complete the binding process.
Ensure your remote control is also in binding mode according to its specific instructions.
5.2. Wiring Connections
Connect your servos and other components to the HR7E receiver as per the pinout diagram. The receiver supports up to 7 PWM servo channels and a CRSF/S.BUS interface.
Connect your servos to channels CH1-CH7. The CH8 port can be used for CRSF or S.BUS connections, offering flexibility for various flight controllers and sensor expansions.
6. Operating Instructions
6.1. Telemetry Voltage Return
The HR7E receiver features built-in receiver voltage return and aircraft battery voltage return functions. It can automatically detect the voltage input. This telemetry data can be displayed on your compatible remote control.
This image demonstrates how receiver and aircraft battery voltages are displayed via telemetry on a remote control, showing values like 6.1V and 16.7V for RxBt (Receiver Battery).
6.2. WiFi Upgrade and Settings
The HR7E receiver supports WiFi for firmware upgrades and configuration settings. This allows for convenient updates and customization without physical connection to a computer.
To access the receiver's WiFi interface for upgrades or settings, connect to the 'ExpressLRS TX' network and use 'expresslrs' as the security key. Further instructions for specific updates can be found on the ExpressLRS documentation.
7. Maintenance
- Keep the receiver clean and free from dust and debris.
- Ensure antenna wires are not cut, kinked, or damaged. The silicone protection helps, but inspect regularly.
- Avoid exposing the receiver to extreme temperatures or moisture.
- Periodically check all connections for secure fit.
- For optimal performance, ensure your receiver firmware is up-to-date using the WiFi upgrade feature.
8. Troubleshooting
- No Signal / Loss of Control:
- Verify that the receiver is correctly bound to your remote control. Repeat the binding process if necessary.
- Check all wiring connections, especially power and servo connections.
- Ensure the remote control and receiver are powered on and within range.
- Inspect antennas for damage or improper placement.
- Confirm that the remote control's firmware and the receiver's ExpressLRS firmware are compatible.
- Telemetry Data Not Displaying:
- Ensure the telemetry voltage input is correctly connected.
- Check your remote control's settings to ensure telemetry display is enabled and configured for the HR7E receiver.
- Verify that the receiver's firmware supports the telemetry features you are trying to use.
- Difficulty with WiFi Upgrade:
- Ensure the receiver is powered on and in WiFi mode (if applicable, check LED indicators).
- Double-check the WiFi network name ('ExpressLRS TX') and password ('expresslrs').
- Try restarting both the receiver and your computer/device.
- Ensure your device's WiFi adapter is functioning correctly.
9. User Tips
- Antenna Placement: For optimal range and signal quality, ensure the dual antennas are mounted at a 90-degree angle to each other and away from carbon fiber or metal parts of your model.
- Firmware Updates: Regularly check the official ExpressLRS documentation for the latest firmware updates. Keeping your receiver updated can improve performance, add new features, and fix bugs.
- Power Considerations: While the receiver supports a wide voltage range (DC 4.5-8.4V), always ensure your power source is stable and within these limits to prevent damage. The automatic voltage detection is a useful feature, but always double-check your setup.
- CRSF Interface: Utilize the 4-wire CRSF interface for future sensor expansions or direct connection to compatible flight controllers for advanced functionality.
10. Warranty and Support
For warranty information and technical support, please refer to the official HelloRadioSky or HawkSpeed website, or contact your retailer. Keep your proof of purchase for any warranty claims.
This product is designed for hobby use. Proper installation and operation are crucial for safe and reliable performance. The manufacturer is not responsible for damages or injuries resulting from improper use or modification of the product.