Using ESC Beacon as a lost model alarm

Do you notice the start-up beeps the motor/ESC makes when you plug in the LiPo battery? It beeps even when there is no buzzer connected, and we can turn that feature into a lost model alarm.

It can be useful when you don’t have a buzzer installed, or in case your buzzer failed in a crash. Check here for more useful tips on quadcopter building/flying.

In this tutorial we will show you how to do this in ESC’s with BLHeli firmware. To set it up there are only 2 settings you need to configure in BLHeliSuite:

  • Beacon Strength – How loud you want the beeper to sound (default 80, range from 1 to 255); 120 is a good value IMO, I suggest trying different values and check if the motors and ESC would get too hot. I don’t recommend setting this too high to prevent motors and ESC overheat
  • Beacon Delay – After how long the beeper starts to activate being idle (default 10mins, IMO 5 or even 2 mins is a good idea for our purpose)

There is also Beep Strength. This setting might seem relevant but actually it’s not. It only controls the volume of the start-up beep, just leave it as it is.

A bit out of topics, if you ever wondered how ESC’s can make sound, they don’t. It’s actually the motors that makes the sound. The pitch and volume of the sound is controlled by signal from the ESC. It’s even possible to play a jingle with motors :)

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