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What is responsible for a drone or ESC's startup jingle?

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MarkMLl:
This video https://youtu.be/3sb7GCFheK4?t=305 (at 05:05 from the start) has something playing a distinctive startup jingle, which in its entirety is five notes. I suspect that this is from the "ODrive" board, which I believe controls ESC (Electronic Speed Control) boards.

I hear the same jingle from various cheap drones on YouTube etc., even if their (proprietary) firmware doesn't acknowledge ODrive as a component. For example

Where is this coming from? The ESCs themselves don't appear to have the smarts to store a jingle, so is this a characteristic of a PixHawk derivative, of Ardupilot, or basically... what?

MarkMLl

Psi:
Dunno who came up with it, probably someone in china.
but some ECSs will play the tune, then beep a number of times to indicate what battery was detected based on voltage.  eg 3 beeps for 3S

Alex Eisenhut:
The ESC definitely has the smarts to run a jingle, they wiggle the motor to make the tones. Like how they make floppy drive music.

MarkMLl:
The photos at https://fccid.io/2AG45-XT200/Internal-Photos/Internal-Photos-3411203.html appear to confirm that the ESC boards in the drone I cited do have controller chips as well as FETs.

So the big question here is whether ODrive originated this jingle, or borrowed it as "a good idea" from somebody else. In any event ODrive https://github.com/odriverobotics/ODrive appears to be MIT-licensed, so even if various drone manufacturers have used it without attribution they can't really be criticised: which would not be the case if they'd borrowed from Ardupilot (GPL) or PX4 (BSD), hence my question.

MarkMLl

Psi:
Most china ESCs are based on either ATMega or STM32 mcus.

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