Add a buzzer to Multirotor frame

Introduction

Discovery Buzzers can be be connected directly to a free PWM channel on an RC receiver but when using a "one wire" RCInput (OPLink, PPM, SBus, Spektrum or SRXL) receivers, direct connection might not be possible. This function is useful when you lost your mini Quad in a cornfield

In this case buzzer can be connected to a free output port, directly to the board.

Here is the HobbyKing® Discovery Buzzer that can be used.

Please note: the previous method using the Custom tab is depreciated. With custom mixer the vehicle is not identified anymore as a multirotor and some functions stop working, like ASWA.

In this page

Configure your Rc transmitter

You need to assign a switch to a output in your receiver, like this Taranis example, SF switch mapped to Output7 (Buz) :

Configure RcInput

After the changes above in your Rc transmitter you need to redo the Rc Transmitter Wizard and detect the new channel as a new Accessory[0 - 3].

Later this accessory can be easily mapped to one board's output. Here is an example where Ch7 is assigned to Accessory1.

Select output

Go to Vehicle tab > Multirotor

Set the Accessory1 mapped to Output6, keep Curve1 selected.
Save changes !

Configure Output

Last step is output 6 setup, go to Output tab and adjust output limits to 1000µs (Min), 1500µs (Neutral) and 2000µs (Max) and save changes.

Some know issues :

Be sure the bank (in this example, bank4 - purple) used for the buzzer output channel uses PWM at 50Hz rate. If channel used for buzzer share a bank already used for motor output at higher rates or Oneshot125, buzzer may not work!!
Be sure the regulated output that power board is not too high, at 6v the buzzer (from HK) stop working.

Test setup

Connect Discovery buzzer to Output 6, connect a flight battery and move switch in your Rc Transmitter.

Now enjoy mini quad racer hunting in cornfield