Hobbywing RPM Sensor is a compact brushless motor speed signal sensor designed to detect voltage changes from brushless motor wires and output an RPM signal for compatible speed control, governor, and telemetry-related systems. It is commonly used in RC helicopter setups where a separate RPM signal is required for systems such as V-Bar-style governor applications.
This sensor works with different brushless motors and different PWM driving methods. Its lightweight 23 × 10 × 2mm body, 3.5–8.4V working voltage range, 2–14S motor wire voltage range, and 1000–300000rpm measuring range for 2-pole brushless motors make it a practical accessory for advanced ESC and helicopter power-system setup.
Use this RPM sensor only when your ESC, flybarless system, governor system, or receiver-side electronics require an external RPM signal input. Always confirm voltage supply, signal wiring, motor wire connection, and system compatibility before installation.
Quick Fit Check
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Function: Detects brushless motor wire voltage changes and outputs an RPM signal.
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Best for: Compatible governor systems, V-Bar-style RPM signal applications, and supported ESC / flight control setups.
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Motor type: Brushless motor.
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Working voltage: 3.5–8.4V.
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Motor wire voltage range: 2–14S LiPo.
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RPM range: 1000–300000rpm for 2-pole brushless motors.
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Size: 23 × 10 × 2mm.
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Weight: Approx. 6g including input and output wires.
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Important: Leads A and B connect to any two brushless motor wires and do not require polarity matching.
Product Specifications
| Brand |
Hobbywing |
| Product Name |
RPM Sensor |
| Function |
Detects brushless motor wire voltage changes and outputs RPM signal |
| Working Voltage |
3.5–8.4V |
| Current |
1–5mA |
| Motor Wire Voltage Range |
2–14S LiPo |
| RPM Range |
1000–300000rpm for 2-pole brushless motor |
| Working Temperature |
0–50°C / 32–122°F |
| Size (L × W × H) |
23 × 10 × 2mm |
| Approx Weight |
6g including input and output wires |
| Typical Application |
RPM signal input for compatible speed control systems and V-Bar-style governor systems |
| Stock Number |
86060041 |
What the RPM Sensor Does
The Hobbywing RPM Sensor reads voltage changes from the brushless motor wires and converts that information into an RPM signal. This makes it useful when a compatible governor system, flight controller, flybarless unit, or ESC-related system needs a separate motor speed signal.
One typical application is using the sensor as an RPM signal source for V-Bar-style systems in RC helicopters. The sensor does not control throttle by itself, and it does not replace the ESC. It only provides RPM signal output to a compatible system that can read and use that signal.
Compatibility note: This sensor should only be used with systems that support external RPM signal input. Check your flybarless controller, governor system, ESC manual, and wiring requirement before installation.
How to Wire the RPM Sensor
The sensor has two motor-side leads and one signal-side lead group. Leads A and B connect to any two wires of the brushless motor. Polarity does not matter for the A and B motor wire connection.
Lead C is the three-color signal wire with a connector at the end. The black wire is ground, the red wire connects to 3.3V or 5V to supply the sensor, and the white wire outputs the RPM signal.
Wiring note: Connect A and B to any two brushless motor wires without polarity concern. On the three-color lead, black is ground, red is 3.3V or 5V sensor power, and white is RPM signal output.
For RC Helicopter Governor and V-Bar-Style Setups
In electric helicopter setups, RPM signal quality can be important for governor performance and head-speed monitoring. The Hobbywing RPM Sensor can be used as a compact signal source when the helicopter electronics require an external RPM input.
Because different helicopters, ESCs, motors, and flybarless systems use different wiring layouts, the RPM sensor should be treated as a setup accessory rather than a universal plug-and-play module. Confirm your system wiring before applying power.
Installation and Safety Notes
- Do not disassemble, modify, or repair the RPM sensor yourself.
- Do not allow water or moisture to enter the sensor.
- Keep wiring secure and away from rotating parts, gears, motor shafts, and high-heat areas.
- Confirm 3.3V or 5V sensor power before connecting the signal-side lead.
- Check motor wire routing carefully when working with 2–14S LiPo power systems.
Official Manual
Download the official manual here: Hobbywing RPM Sensor User Manual.
Recommended Collection Paths
FAQ: Hobbywing RPM Sensor
What does the Hobbywing RPM Sensor do?
It detects voltage changes from brushless motor wires and outputs an RPM signal for compatible speed control, governor, or flybarless systems.
Is the RPM Sensor an ESC programmer?
No. It is not an ESC programmer or programming card. It is an RPM signal sensor used to provide motor speed information to compatible systems.
How do I connect the RPM Sensor to the motor?
Connect leads A and B to any two brushless motor wires. Polarity does not matter for these two motor-side leads.
What do the three signal wires do?
On lead C, the black wire is ground, the red wire connects to 3.3V or 5V to power the sensor, and the white wire outputs the RPM signal.
What voltage range does the RPM Sensor support?
The sensor working voltage is 3.5–8.4V, and the motor wire signal voltage range supports 2–14S LiPo systems.
Can I use it with V-Bar-style helicopter systems?
Yes, one typical application is using it as an RPM sensor for V-Bar-style systems, as long as your setup supports this kind of external RPM signal input.
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