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I added information to help anyone who runs into the same problem I did, the buzzer not functioning after trying multiple devices.  I researched and saw you need to have 5v power to the board. The ESC connection is a simple place to power the board when working on the flight controller on a bench. This allows you to use the buzzer for conformations.  

Please see added text and link to a Radio Shack (local US electronics retailer) buzzer.

2014-12-04 02:00:23 -08:00

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Buzzer

Cleanflight supports a buzzer which is used for the following purposes, and more:

Low Battery alarm (when battery monitoring enabled) Notification of calibration complete status. AUX operated beeping - useful for locating your aircraft after a crash. Failsafe status.

Buzzer is enabled by default on platforms that have buzzer connections.

Types of buzzer supported

The buzzers are enabled/disabled by simply enabling or disabling a GPIO output pin on the board. This means the buzzer must be able to generate it's own tone simply by having power applied to it.

Buzzers that need an analogue or PWM signal do not work and will make clicking noises or no sound at all.

Examples of a known-working buzzers.

Connections

Naze32

Connect a supported buzzer directly to the BUZZ pins. Observe polarity. Also if you are working with flight controller outside of a craft, on a bench for example, you need to supply 5 volts and ground to one of the ESC connections or the buzzer will not function.

CC3D

Buzzer support on the CC3D requires that a buzzer circuit be created to which the input is PA15. PA15 is unused and not connected according to the CC3D Revision A schematic. Connecting to PA15 requires careful soldering.

See the [CC3D - buzzer circuir.pdf](Wiring/CC3D - buzzer circuir.pdf) for details.

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