46 lines
2.3 KiB
Markdown
46 lines
2.3 KiB
Markdown
# Buzzer
|
|
|
|
Cleanflight supports a buzzer which is used for the following purposes:
|
|
|
|
* Low and critical battery alarms (when battery monitoring enabled)
|
|
* Arm/disarm tones (and warning beeps while armed)
|
|
* Notification of calibration complete status
|
|
* TX-AUX operated beeping - useful for locating your aircraft after a crash
|
|
* Failsafe status
|
|
* Flight mode change
|
|
* Rate profile change (via TX-AUX switch)
|
|
|
|
If the arm/disarm is via the control stick, holding the stick in the disarm position will sound a repeating tone. This can be used as a lost-model locator.
|
|
|
|
There is a special arming tone used if a GPS fix has been attained, and there's a "ready" tone sounded after a GPS fix has been attained (only happens once). The tone sounded via the TX-AUX-switch will count out the number of satellites (if GPS fix).
|
|
|
|
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 its own tone simply by having power applied to it.
|
|
|
|
Buzzers that need an analog or PWM signal do not work and will make clicking noises or no sound at all.
|
|
|
|
Examples of a known-working buzzers.
|
|
|
|
* [Hcm1205x Miniature Buzzer 5v](http://www.rapidonline.com/Audio-Visual/Hcm1205x-Miniature-Buzzer-5v-35-0055)
|
|
* [5V Electromagnetic Active Buzzer Continuous Beep](http://www.banggood.com/10Pcs-5V-Electromagnetic-Active-Buzzer-Continuous-Beep-Continuously-p-943524.html)
|
|
* [Radio Shack Model: 273-074 PC-BOARD 12VDC (3-16v) 70DB PIEZO BUZZER](http://www.radioshack.com/pc-board-12vdc-70db-piezo-buzzer/2730074.html#.VIAtpzHF_Si)
|
|
|
|
## 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 circuit.pdf](Wiring/CC3D - buzzer circuit.pdf) for details.
|