SKU: 32938543020

Radiomaster ERS-CU01 - Real-Time Current Sensor for Compatible ExpressLRS PWM Receivers

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Description

Radiomaster ERS-CU01 - Real-Time Current Sensor for Compatible ExpressLRS PWM ReceiversThe 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

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

  • 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 ExpressLRS 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). 

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

*Battery Capacity must be set in mAh for telemetry

Specifications

  • 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

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Size

Weight

Package Includes

  • 1 * ERS-CU01 Current Sensor
  • 3 * Heat-Shrinkable Tube
  • 1 * Manual QR Code Card

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 32938543020

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Dianna Z.
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Timex tradition
The watch is pretty and functions great. The only thing I don't like is the light blue second hand is a bit hard to see in certain lighting. The other hands and numbers are easy to read and the band is easy to use. Nice watch with my favorite features.
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Good purchase.
This is a very good price. It is easy to read, lights up at night. I am a nurse and must have a watch for work. Colors are cheerful. Easy to clean the band.
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Birmingham, US
★★★★★ 4
Love the military time feature & indiglo!
This is a great watch. Large face. I think I’ll have to change the band out quicker than I had hoped but I still think for the price it is great. Also, the pin snapped out randomly the second day I wore it while doing chores but it was easy to put back in since the pin was easy to find (thankfully). Still like it a lot for the features.
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Dej
Los Angeles, US
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Attractive and reliable
Very attractive color. Numbers are large enough to read. Honestly don’t know if watch is completely water resistant because have not had the opportunity to find out. Love that watch lights up!
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