JHEMCU JHE20B Finder Buzzer User Manual

1. Introduction

The JHEMCU JHE20B Finder Buzzer is a compact and powerful tracking device designed for RC FPV airplanes and drones. It features a super loud alarm and an integrated LED light, ensuring your lost model can be easily located. Equipped with a built-in battery, it offers autonomous alarming capabilities even if the main flight battery is disconnected.

JHEMCU JHE20B Finder Buzzer highlighting Loud Sound and Autonomous Alarm — JHEMCU JHE20B Finder Buzzer, highlighting its loud sound and autonomous alarm features.

2. Features

Loud Sound: Emits a 100 dB drip sound for easy location.
Autonomous Alarm: Built-in battery allows the buzzer to activate automatically after 30 seconds of main flight battery power failure.
LED Light: Integrated white LED light assists in visual tracking during autonomous alarm mode.
Dual Operation Modes: Functions as a traditional active buzzer synchronized with the flight controller, and as a standalone autonomous alarm.
Wide Compatibility: Compatible with all Betaflight (BF) and Cleanflight (CF) flight controls.

Close-up of JHE20B Finder Buzzer showing built-in battery and LED, with text about self-alarm function — The JHE20B Finder Buzzer features a built-in battery and LED for its self-alarm function.

3. Setup and Installation

3.1 Connection to Flight Controller

The JHE20B Finder Buzzer connects directly to the buzzer interface of your flight controller. Ensure correct polarity and pin assignment.

JHE20B Finder Buzzer with its wiring harness — The JHE20B Finder Buzzer comes with a wiring harness for easy connection.

3.2 Wiring Diagram

Refer to the following schematic for connecting the JHE20B Finder Buzzer to your flight controller. This diagram is applicable for Cleanflight and Betaflight F3, F4, and F7 flight controllers.

Connection Schematic diagram for JHE42B Finder to Cleanflight/Betaflight F3, F4, F7 Flight Controllers (GND, +5V, BZ-) — Connection Schematic: Connect GND, +5V, and BZ- from your flight controller to the JHE20B Finder Buzzer.

3.3 Mounting

Mount the buzzer securely on your drone or FPV aircraft using appropriate methods (e.g., double-sided tape, zip ties) ensuring it does not interfere with propellers or other critical components. Its compact size and light weight make it easy to integrate.

JHE20B Finder Buzzer installed on a drone, showing its compact size — The JHE20B Finder Buzzer installed on a drone, demonstrating its small footprint.

4. Operating Instructions

4.1 Traditional Buzzer Function

When connected to the flight controller, the JHE20B Finder Buzzer operates like a traditional active buzzer, synchronized with your flight control system. It will sound according to the flight controller's settings (e.g., arming, disarming, low battery warnings).

JHE20B Finder Buzzer in hand, compatible with traditional active buzzer functions and FC drive synchronization — The JHE20B Finder Buzzer is compatible with traditional active buzzer functions and FC drive synchronization.

4.2 Autonomous Alarm Mode

If the main flight battery is powered off while the flight control was normally connected, the JHE20B Finder Buzzer will automatically activate its autonomous alarm mode. After 30 seconds of power failure, it will emit a 100 dB drip sound, and its white LED will light up to aid in locating your model.

JHE20B Finder Buzzer emitting light, compatible with all BF and CF flight controls — The JHE20B Finder Buzzer's LED light activates during autonomous alarm mode.

4.3 Turning Off the Buzzer

To turn off the JHE20B Finder Buzzer's sound, press and hold the release button on the device for more than 2 seconds.

5. Maintenance

5.1 Charging Status Indication

When the flight control wiring is correct and the multi-rotor aircraft is powered on, the flight control power supply will automatically charge the JHE20B Finder's built-in battery. Observe the red LED for charging status:

Red LED ON: Charging is in progress.
Red LED OFF: Charging is saturated (battery is full).
Red LED FLASHING: Flight controller is powered off, and the buzzer is in the 30-second waiting period before activating the autonomous alarm.

5.2 General Care

Keep the buzzer clean and free from dust and debris. Avoid exposing it to extreme temperatures or moisture. No other specific maintenance is required.

6. Troubleshooting

Buzzer not sounding in traditional mode: Check the connection to the flight controller for correct wiring and polarity. Ensure the flight controller's buzzer settings are configured correctly.
Autonomous alarm not activating: Verify that the main flight battery was disconnected for at least 30 seconds. Ensure the buzzer's internal battery is charged (check red LED status).
LED not lighting up: Check power supply to the flight controller and ensure the buzzer's internal battery is charged.
Buzzer sounds continuously: Ensure the release button has not been accidentally pressed and held for more than 2 seconds, which would turn off the sound. If the issue persists, check for short circuits or damage.

7. Specifications

Feature	Specification
Model	JHE20B Finder Buzzer
Dimensions (LWH)	22mm * 12mm * 9.5mm
Weight	2.7 g
Sound Level (Autonomous)	100 dB
Battery	Built-in (No external battery included)
Material	Composite Material
Compatibility	Betaflight (BF) and Cleanflight (CF) Flight Controls
Recommended Age	14+ years

8. User Tips

Always test the buzzer's functionality after installation and before flight to ensure it's working correctly in both traditional and autonomous modes.
Consider the mounting location carefully to maximize sound propagation and LED visibility in case of a crash.
Regularly check the charging status of the buzzer's internal battery to ensure it's ready for autonomous alarm activation.

9. Warranty and Support

For warranty information, technical support, or any inquiries regarding your JHEMCU JHE20B Finder Buzzer, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.

XDRC JHE20B Finder Buzzer