RadioMaster ERS-CU01 – Real-Time Current Sensor for compatible ExpressLRS PWM Receivers
£19.99 Inc. VAT
An inline ExpressLRS telemetry sensor rated up to 150A and 70V for accurate, full-system power monitoring.
In stock|Next shipping: 09/03/2026
The ERS-CU01 Current Sensor is a compact telemetry module for use with compatible ExpressLRS receivers. Installed inline between the battery and ESC, it measures real-time operating current and voltage sending the data through the ExpressLRSreceiver for display on your EdgeTX radio. This provides instant insight into system load, efficiency, and power consumption across your entire powertrain.
As part of the ERS sensor family, the ERS-CU01 also supports pass-through expansion, allowing easy daisy-chaining with additional telemetry modules.
Features
Features- Real-Time Current Monitoring: View live current draw and voltage directly on your radio to better understand system performance and prevent overload conditions.
- Inline Installation: Soldered between the battery and ESC for accurate, full-system current measurement.
- Future-Ready Pass-Through: Includes in-and-out ports for daisy-chaining additional ERS sensors as your telemetry needs grow.
- Seamless ExpressLRS Integration: Designed to work smoothly with compatible ExpressLRS PWM receivers.
Plug and Play Compatible Receivers:
- ER6 2.4GHz ExpressLRSPWM Receiver
- ER8 2.4GHz ExpressLRSPWM Receiver
- ER8G & ER8GV ExpresersLRS PWM Receiver
Using Sensors with Non-Plug-and-Play PWM ExpressLRS Receivers:
Most PWM ExpressLRS receivers are fully compatible; those without a dedicated UART port require reconfiguration to support external sensors (e.g., for telemetry). To enable this, reassign two PWM output pins as a serial UART—one for TX and one for RX—via the receiver’s Web UI (accessed by putting the receiver into WiFi mode) or via the ExpressLRS LUA script. This enables sensor connectivity while preserving the remaining PWM channels for servos or ESCs.
For receivers that only provide standard servo pins, an optional adapter cable is available that converts the sensor’s UART connector to two standard servo plugs (TX and RX). Available HERE.
Sensor Configuration & Telemetry Logging
To configure this sensor and view telemetry on your EdgeTX radio, install the RadioMaster Sensor Configurator LUA. The LUA allows adjustment of sensor settings, enables proper telemetry display, and supports data logging for post-flight review.
After downloading, connect your radio to a Mac or PC in USB-SD mode.
Copy the LUA files to:
/SCRIPTS/TOOLS/
👉Download the RadioMaster ERS Sensors Configurator.lua
- Item: ERS-CU01 Current Sensor
- Operating voltage: 5–8.4V
- Operating current: 22mA
- Current range: 1–150A
- Max voltage: 70V
- Current accuracy: ±0.5A
- Voltage accuracy: ±0.1V
- Continuous current: 100A
- Temperature range: –10 ℃ to +85 ℃
- Size: 30 × 25 × 10.5mm
- Weight: 20.6g
Included:
- 1 * ERS-CU01 Current Sensor
- 3 * Heat-Shrinkable Tube
- 1 * Manual QR Code Card
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SHIPPING & DELIVERY
We are based in the UK and ship to most destinations worldwide.
We dispatch orders during the times shown on our Dispatch Schedule. Orders placed before the daily dispatch cutoff will ship the same day (subject to stock availability). Orders placed after the cutoff will ship on the next scheduled dispatch day.
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Shipping to the UK
- Order before the daily dispatch cutoff for same day dispatch.
- FREE delivery available on qualifying orders over £99 (under 1kg).
For small, low-value orders, Royal Mail First Class is our most economical option. Royal Mail Tracked 24 is the most popular choice, offering full tracking and flexible delivery options. For guaranteed next working day delivery, we recommend Royal Mail Special Delivery.
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International Postage
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Smaller, lower-value orders may be sent via Airmail or tracked postal services. Economy road and express air courier options are available depending on destination. For faster delivery, we recommend express air courier services such as DHL Express, which typically deliver within 1–2 working days across Europe and a few working days for most other destinations.
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