{"product_id":"radiomaster-ers-cu01-sensor","title":"RadioMaster ERS-CU01 Real-Time Current Sensor Telemetry Module for ExpressLRS PWM Receivers (EdgeTX)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe RadioMaster ERS-CU01 is a real-time current sensor (telemetry module) for use with compatible ExpressLRS PWM receivers. Installed inline between the battery and ESC, it measures real-time operating current and voltage and sends the data through the ExpressLRS receiver for display on your EdgeTX radio. As part of the ERS sensor family, it also supports pass-through expansion for daisy-chaining additional ERS sensors.\u003c\/p\u003e\u003ch2\u003eLaunch Video\u003c\/h2\u003e\u003cp\u003e\u003ciframe height=\"759\" src=\"https:\/\/www.youtube.com\/embed\/ICXLDRpYn9I\" title=\"\" width=\"1349\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal-time data monitoring:\u003c\/strong\u003e Live current draw and voltage telemetry on the radio for power system insight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInline installation:\u003c\/strong\u003e Solder between the battery and ESC for full-system measurement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaisy chain expansion:\u003c\/strong\u003e In\/out ports for linear, pass-through ERS sensor expansion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpressLRS compatible:\u003c\/strong\u003e Designed for ExpressLRS PWM receiver sensor telemetry integration, including plug-and-play support on select models.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor setup help or pre-purchase compatibility questions, contact support@rcdrone.top or visit https:\/\/rcdrone.top\/.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem\u003c\/td\u003e\n\u003ctd\u003eERS-CU01 Current Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating voltage\u003c\/td\u003e\n\u003ctd\u003e5-8.4V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating current\u003c\/td\u003e\n\u003ctd\u003e22mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent range\u003c\/td\u003e\n\u003ctd\u003e1-150A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous current\u003c\/td\u003e\n\u003ctd\u003e100A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBurst current\u003c\/td\u003e\n\u003ctd\u003e150A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax voltage\u003c\/td\u003e\n\u003ctd\u003e70V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent accuracy\u003c\/td\u003e\n\u003ctd\u003e±0.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage accuracy\u003c\/td\u003e\n\u003ctd\u003e±0.1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-10 °C to +85 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e30 x 25 x 10.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e20.6 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eReceiver Compatibility\u003c\/h2\u003e\u003ch3\u003ePlug-and-Play Compatible Receivers\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eER6 2.4GHz ExpressLRS PWM Receiver\u003c\/li\u003e\n\u003cli\u003eER8 2.4GHz ExpressLRS PWM Receiver\u003c\/li\u003e\n\u003cli\u003eER8G ExpressLRS PWM Receiver\u003c\/li\u003e\n\u003cli\u003eER8GV ExpressLRS PWM Receiver\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Receivers That Require Configuration \/ Adapter\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eER4 (adapter required)\u003c\/li\u003e\n\u003cli\u003eER5C-i (adapter required)\u003c\/li\u003e\n\u003cli\u003eER5A (adapter required)\u003c\/li\u003e\n\u003cli\u003eER5C (adapter required)\u003c\/li\u003e\n\u003cli\u003eER6G (adapter required)\u003c\/li\u003e\n\u003cli\u003eER6GV (adapter required)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMost PWM ExpressLRS receivers can work with ERS sensors. Receivers without a dedicated UART port require reconfiguration to support external sensors by reassigning two PWM output pins as a serial UART (TX and RX) via the receiver Web UI (WiFi mode) or the ExpressLRS LUA script. For receivers that only provide standard servo pins, an optional adapter cable can convert the sensor UART connector to two standard servo plugs (TX and RX).\u003c\/p\u003e\u003ch2\u003eSensor Configuration \u0026amp; Telemetry Logging\u003c\/h2\u003e\u003cp\u003eTo configure the sensor and view telemetry on EdgeTX, install the RadioMaster Sensor Configurator LUA (RM Sensor Configurator). Copy the LUA files to:\u003c\/p\u003e\u003cp\u003e\u003ccode\u003e\/SCRIPTS\/TOOLS\/\u003c\/code\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eBattery capacity must be set in mAh for telemetry.\u003c\/strong\u003e\u003c\/p\u003e\u003ch2\u003eDownloads\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/ERS-CU01-1.4.pdf?v=1769658273\" rel=\"noopener\" target=\"_blank\"\u003eERS-CU01 User Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/SENSOR_LUA.zip?v=1769595857\" rel=\"noopener\" target=\"_blank\"\u003eRadioMaster ERS Sensors Configurator.lua\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0701\/8066\/7584\/files\/ERS_Sensors_V1.9.bin?v=1778047269\" rel=\"noopener\" target=\"_blank\"\u003eERS Series Sensors Firmware V1.9\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhat's Included\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e1 x ERS-CU01 Current Sensor\u003c\/li\u003e\n\u003cli\u003e3 x Heat-Shrinkable Tube\u003c\/li\u003e\n\u003cli\u003e1 x Manual QR Code Card\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2 id=\"details\"\u003eDetails\u003c\/h2\u003e\u003cdiv class=\"details-gallery\"\u003e\n\u003cimg alt=\"RadioMaster ERS-CU01 real-time current sensor module with inline battery-to-ESC leads for ExpressLRS telemetry\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for.jpg?v=1780652097\"\u003e\u003cp\u003eMonitor real-time current draw and pack voltage on your EdgeTX radio by installing the ERS-CU01 inline between the battery and ESC.\u003c\/p\u003e\n\u003cimg alt=\"EdgeTX Tools menu highlighting RM Sensor Configurator app for RadioMaster ERS sensor setup\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_13651eda-e30e-4397-af7e-25151820b108.jpg?v=1780652104\"\u003e\u003cp\u003eUse the RM Sensor Configurator LUA tool in EdgeTX to discover sensors, set battery capacity (mAh), and manage updates.\u003c\/p\u003e\n\u003cimg alt=\"RadioMaster Sensor list screen with Current, RPM, Baro and Cell sensors available for telemetry selection\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_bb102f2f-8099-42f8-846d-482cce312125.jpg?v=1780652113\"\u003e\u003cp\u003eERS sensors appear as separate telemetry sources, making it easy to add current alongside other ERS modules in one model.\u003c\/p\u003e\n\u003cimg alt=\"RadioMaster current sensor settings page with options for LED, sensor power, capacity setting and firmware update\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_609f89fa-f6de-4be9-bde8-e15a79dd4029.jpg?v=1780652120\"\u003e\u003cp\u003eBattery capacity can be entered directly in the configurator to enable more accurate consumption and logging on compatible radios.\u003c\/p\u003e\n\u003cimg alt=\"ERS sensor family linear daisy-chain layout with pass-through in\/out ports for expanding telemetry modules\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_55bb6069-fed1-4d75-b35d-b13815b3c395.jpg?v=1780652131\"\u003e\u003cp\u003eIn\/out ports support pass-through expansion, so additional ERS sensors can be daisy-chained without extra receiver ports.\u003c\/p\u003e\n\u003cimg alt=\"EdgeTX telemetry example reading 58.4A with ERS-CU01 measuring real-time current and voltage during operation\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_e505e19d-accd-4bf0-9a59-7be95596d916.jpg?v=1780652138\"\u003e\u003cp\u003eLive current and voltage telemetry helps spot power system issues and tune your setup with real load data.\u003c\/p\u003e\n\u003cimg alt=\"Plug-and-play compatibility chart for ERS-CU01 with ExpressLRS PWM receivers and optional adapter requirement\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_45a08c3a-ca84-4479-b431-87c0b39ca10f.jpg?v=1780652146\"\u003e\u003cp\u003ePlug-and-play support depends on the receiver’s available UART; some PWM receivers may need pin reassignment or an adapter cable.\u003c\/p\u003e\n\u003cimg alt=\"ERS-CU01 specifications table listing voltage range, current range, accuracy, size and weight\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_9905a84c-8659-49ad-ac3a-00c66061d2c9.jpg?v=1780652154\"\u003e\u003cimg alt=\"RadioMaster ERS-CU01 current sensor board with TX\/RX connector and labeled 30×25×10.5 mm dimensions\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for.png?v=1780652161\"\u003e\u003cp\u003eCompact 30 × 25 × 10.5 mm form factor fits cleanly in builds where wiring space is limited.\u003c\/p\u003e\n\u003cimg alt=\"ERS-CU01 current sensor on digital scale displaying about 20.6 g with attached leads and cable\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_6daa6903-4224-4692-8e4f-14a98a462f1a.jpg?v=1780652168\"\u003e\u003cimg alt=\"Package contents: ERS-CU01 current sensor, manual QR code card, and heat-shrink tubing\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-CU01---Real-Time-Current-Sensor-for_10e59ee6-a49d-488b-80bf-b610c2156030.jpg?v=1780652175\"\u003e\n\u003c\/div\u003e","brand":"RadioMaster","offers":[{"title":"Default Title","offer_id":52968973730016,"sku":"RM0157.ERS-CU01-1","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/1_09a55cdd-dbc8-420f-8d51-41ab3ad54b21.png?v=1780585895","url":"https:\/\/rcdrone.top\/sw\/products\/radiomaster-ers-cu01-sensor","provider":"RCDrone","version":"1.0","type":"link"}