SKU: 29313715385

RadioMaster ERS-RB01 - Brushless Tachometer for Compatible ExpressLRS PWM Receivers

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Description

RadioMaster ERS-RB01 - Brushless Tachometer for Compatible ExpressLRS PWM ReceiversThe ERS RB01 Brushless Tachometer measures RPM by tapping directly into any two wires of a brushless ESC output. The sensor captures precise speed data, sends it to a compatible ExpressLRS receiver via the CRSF interface, and relays the information back to your EdgeTX radio for real time monitoring. Ideal for any application requiring accurate RPM feedback. As part of the ERS sensor family, the ERS RB01 also supports pass through expansion, allowing

The ERS-RB01 Brushless Tachometer measures RPM by tapping directly into any two wires of a brushless ESC output. The sensor captures precise speed data, sends it to a compatible ExpressLRS receiver via the CRSF interface, and relays the information back to your EdgeTX radio for real-time monitoring. Ideal for any application requiring accurate RPM feedback.

As part of the ERS sensor family, the ERS-RB01 also supports pass-through expansion, allowing easy daisy-chaining with additional telemetry modules.

Check out all our ExpressLRS ProductsReceivers, and the rest of our RadioMaster Products!

Plug and Play Compatible Receivers:

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

 

Features:

  • Accurate RPM Monitoring: Captures real-time brushless speed with high precision.
  • ExpressLRS Integration: Sends RPM data directly to compatible ExpressLRS receivers via the CRSF interface.
  • Multi-Unit Support: Connect multiple ERS-RB01 sensors to monitor several units simultaneously.
  • Versatile Applications: Ideal for any application requiring accurate RPM feedback.
  • Compact & Lightweight: Easy to install without adding significant weight.
  • Plug-and-Play: Quick setup with minimal wiring for fast deployment.

Specifications:

  • Item:ERS-RB01 RPM-BLDC Sensor
  • Operating voltage: 5–8.4V
  • Operating current: 10mA
  • Measurement method: Contact type
  • Support: Brushless
  • Motor pole pairs: LUA configurable
  • Range: 200–300, 000RPM
  • Accuracy: ±0.1%
  • Temperature range: –10 ℃ to +85 ℃
  • Size: 28 × 12 × 8mm
  • Weight: 4.8g

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).

Package Includes:

  • 1 * ERS-RB01 RPM-BLDC Sensor
  • 3 * Heat-Shrinkable Tube
  • 1 * Manual QR Code Card
    Shipping Notes
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    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: 29313715385

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    Gary kirshman
    Bozeman, US
    ★★★★★ 5
    I would buy again
    Color: White
    Great price and works great, very bright and easy to install
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    Reviewed in the United States on September 7, 2025
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    T. Roberts
    Grantham, US
    ★★★★★ 5
    Light Up Your Table
    Color: White
    Easy to attach and turn on/off
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    Reviewed in the United States on July 17, 2025
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    irene
    San Leandro, US
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    Affordable
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    Reviewed in the United States on June 17, 2025
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    Amazon Customer
    Belleville, US
    ★★★★★ 1
    Not worth it
    Color: White, Color: White
    Put new batteries in twice and won’t turn on. Such a waste of money.The brightness is little to none , they were working amazing in the beginning. The picture included is the highest setting and has barely any brightness.
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    Reviewed in the United States on September 14, 2025
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    Fox Cole
    Port Orchard, US
    ★★★★★ 5
    Excellent lighting
    Color: Warm
    Highly recommended! I actually reordered one because I forgot one night to bring it in, then a severe storm came through and stole the umbrella, turning it upside down in the yard. Water got into the battery bays, so they rusted. I'm sure other connections inside rusted too, because after cleaning the contacts, I could not get the light to work again. But the reason I purchased a new one is because it looks so classy. Its warm light can be adjusted to three levels just by pressing the On button through the levels. Very simple. The ambiance it provides is lovely! Next to the On button is the clip that flips open to swing open the light. Place the light around the umbrella pole and snap shut the clip. The light is secured, but you can also slide it up or down to whatever height you prefer. It still remains stable and in place until you move it again. Until I left my first one out in the rain, the light worked beautifully and reliably, as does its replacement. Battery life is excellent unless you forget to turn off the light. I can't tell you exactly how long they last because inevitably after a few weeks, I do forget to turn it off. This is an inexpensive and beautiful upgrade to your patio experience. Excellent value, excellent quality, excellent lighting.
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    Reviewed in the United States on June 19, 2025

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