FrSky ADV Hall RPM Sensor Telemetry Module

1. Introduction

The FrSky ADVANCE (ADV) series introduces comprehensive sensor types with enhanced performance and capabilities, building upon the original sensor line. All ADV sensors fully support the FBUS protocol and are also S.Port compatible. The FBUS protocol allows ADV sensors to be seamlessly paired with FBUS-capable receivers, simplifying setup and integration into your remote control system.

The Hall RPM ADV sensor is specifically designed to measure rotational speed. It can transmit telemetry data directly to compatible radios when connected to a receiver via the S.Port/FBUS port. Alternatively, the sensor can be switched to PWM mode, enabling it to pass rotation data to a device port that supports RPM calculation, thereby achieving the same goal of RPM data collection.

2. Package Contents

• FrSky ADV Hall RPM Sensor Module
• Connection Cable
• Magnets (2 pieces)

Image: FrSky ADV Hall RPM Sensor Telemetry Module with included magnets and wiring.

3. Specifications

4. Installation and Setup

Proper installation of the magnets and sensor is crucial for accurate RPM measurement. Refer to the diagram below for visual guidance.

Image: FrSky ADV Hall RPM Sensor installation diagram showing magnet placement scenarios.

4.1 Magnet Installation Scenarios

• Scenario 1: Single Magnet Installation
  When using only one magnet, ensure the distance between the magnet and the center of the sensor's Induction Zone is ≤4mm. Align the magnet with the sensing center point of the sensor.
• Scenario 2: Dual Magnet Installation
  If using both magnets, install them with opposite polarities and position them 180 degrees apart on the rotating surface. The distance between the magnets and the center of the sensor's Induction Zone should be ≤10mm. Align the magnets with the sensing center point.

4.2 Sensor Connection

Connect the Hall RPM ADV sensor to your receiver. The sensor supports both FBUS and S.Port protocols. Ensure your receiver is compatible with one of these protocols for telemetry data transmission.

• FBUS/S.Port Mode: Connect the sensor directly to the FBUS or S.Port port on your compatible receiver. This allows for direct telemetry data transmission to your radio.
• PWM Mode: If your setup requires, the sensor can be switched to PWM mode. In this mode, it outputs rotation data that can be processed by a device port supporting RPM calculation. Consult your receiver or flight controller manual for specific PWM RPM input configurations.

5. Operation

Once installed and connected, the FrSky ADV Hall RPM Sensor will begin measuring the rotational speed of the equipped component (e.g., propeller, motor). The RPM data is then transmitted via telemetry.

• Telemetry Display: On your compatible FrSky radio, navigate to the telemetry screen to view the real-time RPM readings. Refer to your radio's user manual for instructions on setting up and displaying telemetry sensors.
• Data Logging: Many FrSky radios and flight controllers support data logging. Ensure this feature is enabled if you wish to record RPM data for post-flight analysis.
• Alarms: You can configure custom alarms on your radio to alert you if the RPM falls below or exceeds a certain threshold, providing critical feedback during operation.

6. Maintenance

The FrSky ADV Hall RPM Sensor is designed for durability, but proper care can extend its lifespan and ensure consistent performance.

• Keep Clean: Regularly inspect the sensor and magnets for dirt, dust, or debris. Clean gently with a soft, dry cloth. Avoid using harsh chemicals or solvents.
• Check Connections: Periodically verify that all wiring connections are secure and free from damage. Loose connections can lead to intermittent readings or complete signal loss.
• Magnet Integrity: Ensure the magnets remain firmly attached to the rotating surface and are not damaged or corroded. Damaged magnets can affect measurement accuracy.
• Environmental Protection: While designed for RC use, avoid prolonged exposure to extreme temperatures, moisture, or direct sunlight, which can degrade electronic components.

7. Troubleshooting

If you encounter issues with your FrSky ADV Hall RPM Sensor, consider the following troubleshooting steps:

• No RPM Reading:
  
  • Verify the sensor is correctly connected to the S.Port/FBUS port on your receiver.
  • Check the power supply to the sensor (Voltage Range: 3.7V-8.4V).
  • Ensure the magnets are correctly installed according to the installation scenarios (distance and polarity).
  • Confirm the magnets are passing directly over the sensing center point of the sensor.
  • Check your radio's telemetry settings to ensure the RPM sensor is detected and enabled.
• Inaccurate RPM Reading:
  
  • Re-check the magnet installation distances and alignment as per Section 4.1.
  • Ensure the magnets are clean and free from metallic debris that might interfere with the Hall effect.
  • Verify that there are no other strong magnetic fields nearby that could interfere with the sensor.
  • Confirm the RPM measurement range (400-60000RPM) is appropriate for your application.
• Intermittent Readings:
  
  • Inspect all wiring for loose connections or damage.
  • Ensure the sensor is securely mounted and not vibrating excessively.
  • Check for potential electromagnetic interference from other electronic components.

8. Warranty and Support

FrSky products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact your authorized FrSky dealer or visit the official FrSky website. Keep your proof of purchase for warranty claims.