RadioMaster ERS-RB01 RPM-BLDC Sensor
by RadioMaster

RadioMaster ERS-RB01 RPM-BLDC Brushless Tachometer Sensor

The RadioMaster ERS-RB01 RPM-BLDC Sensor is a precision telemetry instrument engineered for the real-time monitoring of brushless motor rotational speeds in advanced unmanned aerial systems (sUAS). Designed specifically for seamless integration with ExpressLRS (ELRS) PWM receivers and the CRSF protocol, this sensor provides mission-critical data to pilots and engineers. By capturing the electrical frequency directly from any two of the three brushless motor wires, the ERS-RB01 delivers highly accurate RPM readings without the need for traditional optical or magnetic sensors, which can be prone to interference or mechanical failure.

This sensor is an essential component for sUAS manufacturers, defense contractors, and educational institutions focused on aeronautical engineering. Monitoring RPM in real-time allows for the detection of motor fatigue, prop strikes, or efficiency drops before they lead to catastrophic failure. Its lightweight and compact form factor ensures it can be integrated into micro-FPV platforms as easily as large-scale industrial or military drones. For government and tactical use, the ERS-RB01 provides the telemetry backbone needed for sophisticated flight logging and performance analysis, ensuring that propulsion systems are operating within optimal parameters during high-stakes operations.

Technical Specifications

• Input Voltage: 4.5V - 8.4V

• Protocol: CRSF / ExpressLRS

• Detection Type: BLDC Electrical Frequency (Two-wire connection)

• Measurement Range: Supports high-KV and high-pole count brushless motors

• Telemetry Output: Real-time RPM data to EdgeTX/OpenTX transmitters

• Compatibility: RadioMaster ER series PWM receivers and compatible ELRS hardware

• Dimensions: 20mm x 10mm x 5mm (Main board)

• Weight: 1.0g (excluding wires)

• Operational Temperature: -10°C to +70°C

What is Included

• 1x RadioMaster ERS-RB01 RPM-BLDC Sensor Module

• 1x Signal Connection Cable (CRSF/Telemetry)

• 2x Motor Phase Detection Wires

• 1x High-Grade Transparent Heat Shrink Tube

• 1x Technical Configuration Guide