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CRSF to PWM Converter, CRSF-PWM-C
Brand: Matek
Product Code: CRSF-PWM-C
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CRSF to PWM Converter, CRSF-PWM-C
Description
1. Product Summary
1.1. Product Description
The Matek CRSF-PWM-C is a high-performance signal converter that receives CRSF protocol data from receivers such as TBS Crossfire or ExpressLRS and outputs up to 10 independent PWM channels. It is designed for FPV drones, RC aircraft, and other models requiring servo or ESC control via CRSF-based receivers. The converter integrates telemetry functions, voltage and current monitoring, and a built-in current sensor for precise feedback.
1.2. Main Features
- Compatible with all receivers supporting the CRSF protocol (Crossfire, ExpressLRS).
- Supports up to 10 PWM output channels.
- Adjustable PWM frequency: 50 Hz (default), 100 Hz, 160 Hz, 330 Hz, 400 Hz.
- Two UART ports:
- UART1 — receiver connection.
- UART2 — GPS, configuration, or firmware update.
- Integrated current sensor: 90 A continuous / 220 A peak, 0–3.3 V output.
- Built-in voltage divider (1K:10K) for up to 36 V battery monitoring.
- Full telemetry support: voltage, current, capacity, battery %, GPS, speed, heading, altitude, satellites.
- No onboard 5 V BEC — requires external 5–9 V power supply for servos or ESCs.
- Firmware upgradable and configurable via UART interface.
2. Technical Specifications
Table 2-1. CRSF-PWM-C Technical Data
| Parameter | Specification |
|---|---|
| PWM Channels | 10 independent outputs |
| PWM Frequency | 50 / 100 / 160 / 330 / 400 Hz (default 50 Hz) |
| UART Ports | 2 (UART1 for receiver, UART2 for GPS/config) |
| Voltage Input (5 V pad) | 4 – 9 V |
| Battery Voltage Monitoring (Vbat) | 0 – 36 V (built-in divider 1K:10K) |
| Current Sensor | 90 A continuous / 220 A peak, 0 – 3.3 V output |
| Dimensions | 26 mm × 26 mm |
| Weight | ≈ 2.8 g |
3. Package Contents
- 1 × Matek CRSF-PWM-C Converter board
- 1 × Low-ESR capacitor
- 2 × Dupont 2.54 mm header pins
4. Connection & Usage Guide
4.1. Wiring Instructions
- Connect the CRSF receiver (Crossfire or ExpressLRS) to UART1 (Tx1/Rx1).
- Connect GPS or telemetry modules to UART2 (Tx2/Rx2) if required.
- Before powering on, set throttle to minimum and sticks to center to calibrate failsafe properly.
- Provide external 5–9 V power for servos and ESCs — no internal BEC on the board.
- LED indicator:
- Slow blink — no CRSF signal detected.
- Solid light — successful CRSF link established.
- Firmware updates and configuration available via UART or USB–TTL adapter.
5. Advantages
- Converts CRSF signals into up to 10 PWM outputs for servos and ESCs.
- Full telemetry support including current, voltage, and GPS data.
- Compact, lightweight, and durable — ideal for FPV drones and RC planes.
- Adjustable PWM frequency for different control hardware.
- Reliable Matek Systems quality and firmware upgrade support.
6. Limitations
- Compatible only with CRSF receivers (not SBUS, PPM, DSM).
- No internal 5 V regulator — external power source required.
- Basic soldering required for installation.
- USB-to-UART adapter required for firmware updates.
7. Quick Summary
The Matek CRSF-PWM-C converter is a professional-grade signal converter that expands CRSF-based receivers with up to 10 PWM channels. Compact, configurable, and telemetry-ready, it is the perfect solution for FPV pilots and RC enthusiasts who need reliable and flexible signal conversion between modern digital control systems and traditional PWM outputs
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