{"product_id":"radiomaster-ers-rc01-tachometer","title":"RadioMaster ERS-RC01 RPM-CDI Gas Engine Tachometer Sensor for ExpressLRS PWM Receivers (CRSF)","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe RadioMaster ERS-RC01 is an RPM-CDI sensor (gasoline engine tachometer) designed to measure engine RPM by connecting directly to a CDI speed output. It detects engine speed and transmits RPM data to a compatible ExpressLRS PWM receiver through the CRSF interface, then forwards telemetry to an EdgeTX radio for real-time monitoring. As part of the ERS sensor family, it also supports pass-through expansion for daisy-chaining additional telemetry modules.\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\u003eAccurate engine RPM:\u003c\/strong\u003e Real-time monitoring of engine RPM data\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpressLRS integration:\u003c\/strong\u003e Sends RPM data to compatible ExpressLRS receivers via CRSF\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDaisy chain expansion:\u003c\/strong\u003e Linear daisy-chained sensors for scalable telemetry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; lightweight:\u003c\/strong\u003e 28 x 12 x 8 mm, 6.0 g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug-and-play workflow:\u003c\/strong\u003e Simple connection to CDI output for fast setup\u003c\/li\u003e\n\u003c\/ul\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\u003eUsing sensors with non plug-and-play PWM ExpressLRS receivers\u003c\/h3\u003e\u003cp\u003eMost PWM ExpressLRS receivers are compatible. Receivers without a dedicated UART port require reconfiguration to support external sensors by reassigning two PWM output pins as a serial UART (one TX and one RX) via the receiver Web UI (WiFi mode) or the ExpressLRS LUA script.\u003c\/p\u003e\u003cp\u003eFor receivers that only provide standard servo pins, an optional adapter cable can convert the sensor’s UART connector to two standard servo plugs (TX and RX).\u003c\/p\u003e\u003cp\u003eFor product selection help or installation questions, contact customer service at \u003ca href=\"https:\/\/rcdrone.top\/\" rel=\"noopener\" target=\"_blank\"\u003ehttps:\/\/rcdrone.top\/\u003c\/a\u003e or email \u003ca href=\"mailto:support@rcdrone.top\"\u003esupport@rcdrone.top\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eSensor Configuration \u0026amp; Telemetry Logging\u003c\/h2\u003e\u003cp\u003eTo configure the sensor and view telemetry on an EdgeTX radio, install the RadioMaster Sensor Configurator LUA. It supports sensor setup, correct telemetry display, and data logging.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConnect the radio to a Mac or PC in USB-SD mode\u003c\/li\u003e\n\u003cli\u003eCopy LUA files to: \u003ccode\u003e\/SCRIPTS\/TOOLS\/\u003c\/code\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eItem\u003c\/td\u003e\n\u003ctd\u003eERS-RC01 RPM-CDI 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\u003e8mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector type\u003c\/td\u003e\n\u003ctd\u003e3-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003ctd\u003eCDI gasoline ignition\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRange\u003c\/td\u003e\n\u003ctd\u003e200-300,000 RPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e±0.1%\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\u003e28 x 12 x 8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.0 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\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-RC01-1.3.pdf?v=1769666378\" rel=\"noopener\" target=\"_blank\"\u003eERS-RC01 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-RC01 RPM-CDI 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-RC01 RPM-CDI gas engine tachometer sensor for ExpressLRS PWM receivers (CRSF)\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for.jpg?v=1780653556\"\u003e\u003cp\u003eTrack gasoline engine RPM through the CDI speed output and send the telemetry to ExpressLRS (CRSF) for EdgeTX display.\u003c\/p\u003e\n\u003cimg alt=\"EdgeTX Apps menu showing RM Sensor Configurator tool for setting up RadioMaster ERS sensors\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_40fc7afe-d0bc-4336-86a1-573b6f0b5d44.jpg?v=1780653565\"\u003e\u003cp\u003eUse the RM Sensor Configurator LUA on EdgeTX to configure the ERS-RC01 and manage telemetry settings.\u003c\/p\u003e\n\u003cimg alt=\"RadioMaster Sensor list screen with RPM sensor entries detected for telemetry setup\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_8e7d7925-e865-42dc-96f5-b01cb27f6af3.jpg?v=1780653576\"\u003e\u003cp\u003eMultiple ERS modules can be discovered in one list for quick setup when expanding your telemetry system.\u003c\/p\u003e\n\u003cimg alt=\"Graphic of linear daisy-chained RadioMaster ERS telemetry sensors connected in series\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_d83be2c2-62fe-4934-b7e5-4c946648c27f.jpg?v=1780653586\"\u003e\u003cp\u003ePass-through expansion supports a clean, linear daisy-chain for adding more ERS telemetry sensors.\u003c\/p\u003e\n\u003cimg alt=\"ERS-RC01 connected with live engine RPM telemetry values displayed on an EdgeTX radio screen\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_de4e72a6-04c5-47ba-a1b2-f9b93621fa32.jpg?v=1780653596\"\u003e\u003cp\u003eReal-time RPM readouts help monitor engine speed during tuning, testing, and flight.\u003c\/p\u003e\n\u003cimg alt=\"Plug-and-play compatibility chart for ERS-RC01 with RadioMaster ExpressLRS PWM receivers (ER6\/ER8)\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_825a7de9-6500-4e0d-99e4-6c2eb66734ff.jpg?v=1780653606\"\u003e\u003cp\u003eWorks plug-and-play with supported ER-series PWM receivers, with options to reassign pins on other PWM ELRS setups.\u003c\/p\u003e\n\u003cimg alt=\"ERS-RC01 specifications table showing voltage, current, RPM range, accuracy, size, and weight\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_6f70580f-6e03-4893-b2b9-74d2c3dc62b6.jpg?v=1780653615\"\u003e\u003cp\u003eKey specifications at a glance, including input voltage range, RPM range, accuracy, and operating temperature.\u003c\/p\u003e\n\u003cimg alt=\"Close-up of ERS-RC01 module with labeled dimensions 28 x 12 x 8 mm and 3-pin connector\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_ade28fe2-517b-4d5d-8835-ace2f162b9df.jpg?v=1780653625\"\u003e\u003cp\u003eCompact 28 × 12 × 8 mm module with a simple 3-pin connection for quick installs in tight airframes.\u003c\/p\u003e\n\u003cimg alt=\"RadioMaster ERS-RC01 sensor and cable on a digital scale showing lightweight hardware\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_c4246df7-55f5-4e33-a9d7-6b8551aff75e.jpg?v=1780653635\"\u003e\u003cp\u003eThe sensor stays light and tidy, helping keep wiring and component weight to a minimum.\u003c\/p\u003e\n\u003cimg alt=\"Package contents for ERS-RC01: RPM-CDI sensor, manual QR code card, and heat-shrink tubes\" loading=\"lazy\" src=\"https:\/\/rcdrone.top\/cdn\/shop\/files\/RadioMaster-ERS-RC01---CDI-Gas-Engine-Tachometer-for_22f44f02-0ee6-40a8-bd8a-c60f50b96472.jpg?v=1780653645\"\u003e\u003cp\u003eEverything needed to get started is included: ERS-RC01 sensor, QR manual card, and heat-shrink tubing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"RadioMaster","offers":[{"title":"Default Title","offer_id":52969696035040,"sku":"RM0157.ERS-RC01-1","price":28.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/3210\/3904\/files\/1_5976be61-770e-4afa-a2fd-153e0e0ed010.jpg?v=1780586326","url":"https:\/\/rcdrone.top\/es\/products\/radiomaster-ers-rc01-tachometer","provider":"RCDrone","version":"1.0","type":"link"}