Meteor75 Pro Buzzer Mod: Adding a Self-Powered JHE20B Buzzer Using Betaflight Resource Remapping

 Why Add a Buzzer to the Meteor75 Pro?

The BetaFPV Meteor75 Pro does not include a self-powered lost model buzzer, making it difficult to locate after a crash. In this guide I show how I installed a JHE20B self-powered buzzer on my Meteor75 Pro O4 and configured Betaflight resource remapping to make it work.

JHE20B buzzer installed on the BetaFPV Meteor75 Pro O4 frame

Why Add a Self-Powered Buzzer to the Meteor75 Pro?

The BetaFPV Meteor75 Pro is a great tinywhoop, but locating it after a crash can be difficult, especially in tall grass. The JHE20B self-powered buzzer continues beeping even if the flight battery disconnects, making it much easier to recover a lost drone. In this guide I show how I installed and configured it using Betaflight resource remapping.

The BetaFPV Meteor75 Pro does not include a loud self-powered buzzer from the factory, making it difficult to locate after a crash in tall grass or dense vegetation. In this guide, I will show how I installed a JHE20B self-powered buzzer on my Meteor75 Pro O4 and used Betaflight resource remapping to make it work correctly.

I crashed my drone, and the worst part is that it happened in a field with waist-high grass. I searched for hours, nearly giving up, but I eventually found it. So, I decided it's better to add a small buzzer; I don't want to spend hours searching again if I crash my Meteor75 Pro.

Parts Required

JHE20B Self-Powered Buzzer
Soldering Iron
Fine Solder
BetaFPV Meteor75 Pro O4
Betaflight Configurator

The buzzer i used is JHE20B ( https://s.shopee.ph/3LDAu7Iham ), its small and with its own batt

JHEMCU JHE20B

Matrix 1s 3 in 1 flight controller (Meteor75 Pro HD DJI o4 Lite)

Matrix 1s 3 in 1 HD flight controller

it seems the Matrix 1s 3in1 HD doesnt have a buzzer +B -B pad and the only free UART in the FC is TX2. the only way is to remap the Betaflight Beeper to UART TX2.

connect FC to Betaflight, go to CLI tab

FYI, just to be clear not all FC has the same mapping (ex. SB F405 resource BEEPER 1 C15)

type "resource"

look for the word "resource BEEPER 1 A08" (A08 is the default for my FC)

next, look for the word "resource SERIAL_TX 2 A02" (A02 is the default for my FC)

to remap Beeper to UART TX2 type "resource Beeper 1 A02"

next, type "resource SERIAL_TX 2 none"

next, type "set beeper_inversion = Off" (the default is On) if u dont do this once u power up ur buzzer wont stop beeping continously.

next, type "Save"

Betaflight beeper resource remapping
CLI:

resource Beeper 1 A02
resource SERIAL_TX 2 none
set beeper_inversion = Off

save

you can close BF and disconnect from USB

next is you solder the Green(-B) wire to TX2 pad, then the +5v pad and GND pad to power source, reminder JHEMCU JHE20B pinout Green(-B), Red(+5v) and Black(GND) 🥸

Matrix 1s 3in1 HD flight controller

JHEMCU JHE20B

JHE20B buzzer installed on the BetaFPV Meteor75 Pro O4 frame

Testing the buzzer

and thats it, i just glued the buzzer, just want to keep it simple. 👍

If you're also running the DJI O4 Lite system check out the small simple mod to add some protection.

FAQ

Can the Meteor75 Pro use a self-powered buzzer?

Yes. A JHE20B self-powered buzzer can be connected and configured through Betaflight resource remapping.

What is Betaflight resource remapping?

Resource remapping allows Betaflight to assign different functions to available microcontroller pins.

Will the buzzer still work if the battery ejects?

Yes. The JHE20B contains its own backup battery and can continue beeping after the main battery disconnects.