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.
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) :
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.
Go to Vehicle tab > Multirotor
Set the Accessory1 mapped to Output6, keep Curve1 selected.
Save changes !
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.
Connect Discovery buzzer to Output 6, connect a flight battery and move switch in your Rc Transmitter.