MATEKSYS CRSF-PWM-V10 CRSF-PWM Converter with Variometer Instruction Manual

1. Introduction

The MATEKSYS CRSF-PWM-V10 is a compact and versatile converter designed to translate CRSF protocol signals into standard PWM outputs. It features a built-in variometer and supports a wide range of CRSF receivers, making it ideal for various RC applications, including helicopters and drones. This manual provides essential information for proper installation, configuration, and operation of your CRSF-PWM-V10 converter.

2. Package Contents

• 1x CRSF-PWM-V10 Converter
• Dupont 2.54 pins (shipped unsoldered)

3. Specifications

4. Pinout Diagram

Understanding the pinout is crucial for correct wiring. Refer to the diagram below for the layout and function of each pin on the CRSF-PWM-V10 converter.

Key pin functions:

• PWM 1-10: PWM output channels for servos and ESCs.
• TX1, RX1: UART1 for receiver connection.
• TX2, RX2: UART2 for GPS connection.
• 5V: 5V output from the integrated LDO (300mA max).
• G: Ground.
• BEC: Input for external BEC power (4-9V) for servos.
• Vbat: Battery voltage sense input (0-36V max).
• Curr: Current sensor input (0-3.3V).

5. Wiring Instructions

Follow these instructions carefully to connect your CRSF-PWM-V10 converter to your RC system. Ensure all connections are secure and properly insulated.

5.1. Receiver, Battery, and ESC Connection

1. Connect your CRSF receiver's TX/RX to the converter's UART1 (TX1/RX1) pins.
2. Connect the main battery (up to 36V) to the Vbat and G (Ground) pads on the converter.
3. Connect your Electronic Speed Controller (ESC) to the desired PWM output channel (e.g., PWM 1). Ensure the ESC signal wire is connected to the PWM pin and the ground wire to a G pin.
4. Important: Servos must be powered externally. Connect an external BEC (4-9V) to the BEC and G (Ground) pads. Do NOT power servos directly from the 5V LDO on the converter as it is only rated for 300mA.
5. If using an external current sensor, connect its output (0-3.3V) to the Curr pad.
6. For accurate variometer readings, cover the barometer on the converter with an open-form sponge to protect it from airflow and light.

5.2. GPS Module Connection

1. Connect the GPS module's TX to the converter's RX2 pin.
2. Connect the GPS module's RX to the converter's TX2 pin.
3. Power the GPS module using the 5V and G (Ground) pins from the converter's integrated LDO.

6. Operating Instructions and Configuration

Once wired, the CRSF-PWM-V10 can be configured to suit your specific needs.

• PWM Frequency: The PWM output frequency is configurable. The default is 50Hz, but can be set to 100, 160, 330, or 400Hz depending on your servo/ESC requirements. Refer to the specific configuration tool or method for your CRSF system to adjust this setting.
• Telemetry: The converter provides various telemetry IDs including RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats, Vspd, and Baro Alt. To utilize all telemetry features, ensure your radio firmware is EdgeTX 2.7.1/OpenTX 2.3.15 or newer, and ExpressLRS 2.5 or newer.
• Voltage/Current Scaling: The Vbat and Current sensor scales are configurable. This allows for accurate readings based on your battery and external current sensor specifications.
• Failsafe: Configure the failsafe values for each PWM channel to ensure safe operation in case of signal loss. This setting is critical for preventing uncontrolled flight.

Consult your CRSF receiver's documentation and your radio's firmware manual for detailed instructions on accessing and modifying these configuration parameters.

7. Maintenance

The CRSF-PWM-V10 converter is designed for durability, but proper maintenance can extend its lifespan and ensure reliable performance:

• Keep the unit clean and free from dust, dirt, and moisture.
• Regularly inspect all wiring connections for signs of wear, corrosion, or loose contacts.
• Ensure the barometer is always covered with an open-form sponge to prevent environmental interference.
• Avoid exposing the converter to extreme temperatures or direct sunlight for prolonged periods.

8. Firmware Update

The firmware of the CRSF-PWM-V10 is upgradeable. Check the official MATEKSYS website or relevant community forums for the latest firmware versions and detailed instructions on how to perform an update. Always back up your current configuration before attempting a firmware update.

9. Troubleshooting

• No PWM Output:
  • Verify the CRSF receiver is properly bound and receiving a signal.
  • Check all wiring connections between the receiver and the converter.
  • Ensure the converter is receiving adequate power (4-9V on BEC pad).
  • Confirm PWM frequency settings are compatible with your servos/ESCs.
• Incorrect Telemetry Readings:
  • Ensure your radio and ExpressLRS firmware versions meet the minimum requirements (EdgeTX 2.7.1/OpenTX 2.3.15 and ExpressLRS 2.5).
  • Check Vbat and Current sensor scaling settings.
  • Verify GPS module is connected correctly and has a satellite fix.
  • Ensure barometer is covered with foam for accurate altitude readings.
• Servos Not Responding:
  • Confirm external BEC is providing 5-9V to the BEC pads and is properly connected to the servos.
  • Check individual servo connections to the PWM outputs.
  • Verify failsafe settings are not preventing servo movement.

10. User Tips

• Soldering: If soldering the Dupont pins, ensure clean and strong solder joints to prevent intermittent connections. Use appropriate soldering techniques for small electronics.
• Insulation: Always insulate exposed solder joints and wires with heat shrink tubing or electrical tape to prevent short circuits, especially in vibration-prone environments.
• Barometer Protection: As indicated in the wiring diagrams, covering the barometer with an open-form sponge is crucial for stable altitude readings, protecting it from prop wash and ambient light changes.
• Power Management: Remember that the 5V LDO is primarily for low-power devices like GPS or external receivers. High-current devices like servos require a dedicated external BEC connected to the BEC pads.

11. Warranty and Support

For warranty information, technical support, or further assistance, please refer to the official MATEKSYS website or contact your retailer. Keep your proof of purchase for any warranty claims.