RadioMaster ERS-CU01 Current Sensor
by RadioMaster

RadioMaster ERS-CU01 Real-Time Current and Voltage Sensor

The RadioMaster ERS-CU01 Current Sensor is a professional-grade power monitoring solution engineered for high-performance unmanned systems, tactical sUAS, and advanced drone platforms. Designed to integrate seamlessly into the ExpressLRS (ELRS) ecosystem, this sensor provides mission-critical telemetry, including real-time operating current and system voltage, directly to the pilot’s EdgeTX or OpenTX radio transmitter. By measuring the full-system load between the battery and the electronic speed controller (ESC), the ERS-CU01 offers essential insights into propulsion efficiency and battery health, making it a vital component for sUAS manufacturers, government contractors, and defense personnel.

Equipped with the high-speed CRSF protocol, the ERS-CU01 ensures low-latency data transmission, allowing for immediate alerts regarding power surges or critical voltage drops. Its robust inline installation is designed for heavy-lift applications, supporting up to 100A of continuous current and 150A peaks. A key feature of the ERS series is the "future-ready" pass-through port, which enables users to daisy-chain additional sensors—such as GPS or barometers—into a single telemetry string. This modularity is highly valued in the educational sector for university engineering projects and by industrial contractors building complex, multi-sensor surveillance platforms.

Technical Specifications

• Model: ERS-CU01 Current Sensor

• Operating Voltage: 5.0V – 8.4V

• Operating Current: 22mA

• Measurement Range: 1A – 150A (Current) / Up to 70V (Voltage)

• Continuous Current Support: 100A

• Current Accuracy: ±0.5A

• Voltage Accuracy: ±0.1V

• Telemetry Protocol: CRSF (ExpressLRS)

• Interface: UART Serial

• Operating Temperature: -10°C to +85°C

• Dimensions: 30mm x 25mm x 10.5mm

• Weight: 20.6g

• Compatible Receivers: Plug-and-play with RadioMaster ER6, ER8, ER8G, and ER8GV receivers

What is Included

• 1x RadioMaster ERS-CU01 Current Sensor

• 3x Heavy-Duty Heat-Shrinkable Tubes

• 1x Manual QR Code Reference Card