RadioMaster ERS-CV01 Cell Voltage Sensor for ExpressLRS PWM Receivers, 2-8S Balance Telemetry for EdgeTX

Overview

The RadioMaster ERS-CV01 Cell Voltage Sensor is a compact, plug-and-play telemetry module for use with compatible ExpressLRS PWM receivers. Connect it to a battery balance port to monitor real-time voltage for each cell; telemetry is transmitted via the ExpressLRS receiver and can be displayed on an EdgeTX radio.

As part of the ERS sensor family, ERS-CV01 supports pass-through expansion for linear daisy-chaining of additional sensors. For product selection help or setup support, contact support@rcdrone.top or visit https://rcdrone.top/.

Launch Video

Key Features

• Real-time per-cell voltage monitoring on EdgeTX radios (via telemetry).
• Plug-and-play balance port connection for cell-level readings.
• Pass-through expansion (in/out) for daisy-chain sensor setups.
• ExpressLRS integration for compatible ER series ExpressLRS PWM receivers.
• Independent battery monitoring with isolated ground design (supports monitoring separate batteries simultaneously using multiple ERS-CV01 sensors).

Compatible Receivers

Plug-and-play

• ER6 2.4GHz ExpressLRS PWM Receiver
• ER8 2.4GHz ExpressLRS PWM Receiver
• ER8G ExpressLRS PWM Receiver
• ER8GV ExpressLRS PWM Receiver

Adapter required

• ER4
• ER5C-i
• ER5A
• ER5C
• ER6G
• ER6GV

Using Sensors with Non-Plug-and-Play PWM ExpressLRS Receivers

Most PWM ExpressLRS receivers are compatible. Receivers without a dedicated UART port require reconfiguration: reassign two PWM output pins as a serial UART (TX and RX) via the receiver Web UI (WiFi mode) or the ExpressLRS LUA script. This enables sensor connectivity while keeping remaining PWM channels available for servos or ESCs.

For receivers that only provide standard servo pins, an optional adapter cable (UART connector to dual servo plugs: TX and RX) may be required.

Cell Voltage Display, Configuration & Logging (EdgeTX)

The ERS-CV01 requires both the CellsValues LUA and the RadioMaster Sensor Configurator LUA. Together they enable per-cell voltage display, sensor configuration, and telemetry logging on EdgeTX radios.

Copy files to the radio SD card in USB-SD mode:

• CellsValues LUA /WIDGETS/
• RadioMaster Sensor Configurator LUA /SCRIPTS/TOOLS/

Configurator menu items shown include: LED ON/OFF, Sensor Power, Reboot, Set Cell ID, Set Cell Combine, Calibrate, Unit Change.

Specifications

Downloads

• ERS-CV01 User Manual
• CellsValues LUA
• RadioMaster ERS Sensors Configurator.lua
• ERS Series Sensors Firmware V1.9

Whats Included

• 1 ERS-CV01 Cell Voltage Sensor
• 3 Heat-shrinkable tube
• 1 Manual QR code card

Details

Track per-cell battery voltage over ExpressLRS telemetry and view it directly on EdgeTX radios.

Configure sensor power, calibration, cell ID/combining, and units from the RadioMaster Sensor Configurator LUA tool.

Use the Cells Values LUA widget to display each cell’s voltage alongside pack status during a flight or drive.

Pass-through expansion makes it easy to daisy-chain multiple ERS sensors for scalable telemetry setups.

An isolated ground design supports monitoring separate batteries simultaneously when using multiple sensors.

A quick compatibility reference for common ExpressLRS PWM receivers and when an adapter or reconfiguration may be needed.

Compact dimensions help it fit neatly in tight RC installations while keeping the balance-port lead accessible.

Includes the ERS-CV01 sensor, a manual QR code card, and heat-shrink tubing for a clean install.