HelloRadio HR7E ELRS 2.4G PWM Receiver Instruction Manual

1. Introduction

The HelloRadio HR7E receiver is specifically designed for fixed-wing aircraft enthusiasts. It integrates the revolutionary ExpressLRS 2.4GHz system, offering high performance, reliability, flexible configuration, fast response speed, and ultra-long range capabilities. This manual provides essential information for the proper setup, operation, and maintenance of your HR7E receiver.

2. Specifications

3. Safety Guidelines

Always observe the following safety precautions to prevent damage to the receiver or other components:

• Ensure the power supply voltage is within the specified range (DC 4.5-8.4V).
• Verify all connections are correct before powering on the system.
• Keep the receiver away from moisture, extreme temperatures, and strong electromagnetic interference.
• Handle antennas with care to avoid damage.
• This product is intended for users aged 14 and above.

4. Setup and Installation

4.1 Component Overview

• BOOT Key: Used for entering bootloader mode for firmware updates.
• LED: Indicates receiver status (e.g., binding mode, connected).
• EXT-BAT (Telemetry Voltage): Input for external battery voltage telemetry (DC 4.0-35V).
• UART (TX/RX): Serial communication port for advanced configurations or sensor expansion.
• S+/-: Power and ground connections for the receiver.
• CH1-CH7: PWM output channels for connecting servos.
• S.BUS/CRSF/CH8: Multi-functional channel for S.BUS, CRSF, or an additional PWM output.

4.2 Antenna Installation

The HR7E receiver is equipped with dual 18cm high-sensitivity antennas. Ensure they are installed correctly and protected.

• Position the antennas at a 90-degree angle to each other for optimal signal reception.
• Use the provided silicone protection to prevent wear and tear on the antenna wires.
• Ensure antennas are clear of carbon fiber or metal parts of the aircraft that could block the signal.

4.3 Wiring Diagram

Connect your servos and other components according to the following diagram:

• CH1-CH7: Connect your PWM servos to these pins.
• S.BUS/CRSF/CH8: Connect S.BUS or CRSF compatible devices here. This can also function as an 8th PWM channel if configured.
• S+/-: Connect the main power supply to these pins.
• EXT-BAT: Connect an external battery (4.0-35V) for telemetry voltage monitoring.
• UART TX/RX: For advanced serial communication.

4.4 Frequency Alignment (Binding)

To establish a connection between your HR7E receiver and your ExpressLRS transmitter, follow these steps:

1. Power on the receiver. The LED light will turn on. Immediately cut off the power.
2. Repeat step 1 two more times.
3. On the third power-on, the receiver's LED light will flash twice, indicating that it has entered the frequency synchronization (binding) mode.
4. On your remote control (transmitter), select the BIND operation. Refer to your transmitter's manual for specific instructions on initiating the BIND process.
5. Once successfully bound, the receiver's LED will typically show a solid light or a specific pattern indicating a stable connection.

5. Operation

5.1 Telemetry Voltage Return

The HR7E receiver supports voltage telemetry, allowing you to monitor both the receiver's voltage and an external aircraft battery voltage. The system automatically detects the voltage input.

The telemetry data can be viewed on your compatible ExpressLRS transmitter, providing real-time information about your power systems.

5.2 Adjustable Return Power

The receiver's return transmission power can be adjusted up to 100mW. This setting is configurable via the ExpressLRS LUA script on your transmitter. Adjusting return power can optimize range and battery life depending on your flying environment and needs.

5.3 WiFi Upgrade and Settings

The HR7E supports convenient WiFi-based firmware upgrades and settings adjustments. This allows for easy updates without needing a physical connection to a computer.

To access the WiFi interface, power on the receiver and look for an 'ExpressLRS TX' WiFi network. Connect to it using the network security key 'expresslrs'. Then, navigate to the receiver's IP address in a web browser (typically 10.0.0.1) to access the configuration page.

6. Maintenance

• Antenna Care: Regularly inspect the antennas for any signs of damage or wear. The silicone protection helps, but physical impacts can still affect performance.
• Firmware Updates: Keep your receiver's firmware updated to the latest ExpressLRS version for optimal performance and new features. Use the WiFi upgrade method for convenience.
• Cleaning: Keep the receiver clean and free from dust, dirt, and debris. Use a soft, dry cloth for cleaning. Avoid using liquids or solvents.
• Storage: When not in use, store the receiver in a dry, cool place, away from direct sunlight and extreme temperatures.

7. Troubleshooting

• Receiver not binding: Ensure you are following the binding procedure correctly (power cycling three times until LED flashes twice). Verify your transmitter is also in bind mode and using the correct ExpressLRS firmware and bind phrase.
• No signal/intermittent signal: Check antenna connections and placement. Ensure antennas are not obstructed by carbon fiber or metal. Verify the transmitter and receiver are on the same ExpressLRS firmware version and bind phrase.
• Servos not responding: Check all servo connections to the correct PWM channels. Ensure the receiver is powered correctly and bound to the transmitter.
• Telemetry not working: Verify the EXT-BAT connection for external battery voltage. Ensure your transmitter is configured to display telemetry data.
• WiFi upgrade issues: Double-check the WiFi network name ('ExpressLRS TX') and password ('expresslrs'). Ensure your device is connected to the receiver's WiFi network.

8. User Tips

• Always perform a range check before your first flight with a new setup or after any significant changes.
• Consider using a small piece of heat shrink tubing or electrical tape to secure servo and power connections to prevent accidental disconnections during flight.
• Familiarize yourself with the ExpressLRS LUA script on your transmitter to fine-tune receiver settings like return power and channel mapping.
• Regularly check the ExpressLRS project website for the latest firmware updates and documentation.

9. Warranty and Support

For any technical support, warranty claims, or further assistance, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.