Doorbell

A button by a front door that plays a doorbell sound where the visitor stands, and sends a pulse you can use to ring a second bell inside.

Contents

• You need
• Code
• Wire it
• Check it in game
• Change it
• How it works

You need

• a Button
• optional: a One Shot Audio brick inside the house

button "Press Count" -> chip holding
button Character -> chip visitor
chip rang -> speaker Play

Code

const SOUND = $BrickOneShotAudioDescriptor/OBA_DoorBell_1 // the sound it plays
const PITCH = 1.0 // 1.0 is the sound as recorded; higher is higher

@left in holding: int
@left in visitor: character
@right out rang: exec
var last: int = 0

on Change(holding) {
  if holding > last {
    emit rang
    visitor.PlayAudioAt(SOUND, pitch = PITCH)
  }
  last = holding
}

Wire it

1. Compile the chip and paste it in-game. Place the Button beside the door.
2. Wire the Button’s Press Count to holding, and its Character to visitor. Press Count is how many players are holding the button right now. Character is the player who pressed it last.
3. Optional: place the One Shot Audio brick inside, open its settings, pick a sound, and wire rang to its Play.

Check it in game

• Press the button: the doorbell sound plays once, around you.
• Hold the button down: it plays only once until you let go and press again.
• Let go: nothing plays.
• Ask a friend to stand a little way off: they hear it too, quieter.
• While your friend holds the button down, press it yourself: it rings again, around you.
• With the One Shot Audio wired, its sound plays inside at the same moment.

Change it

• Pick another sound: type $BrickOneShotAudioDescriptor/ in the playground, and the editor lists the sounds. OBA_DoorBell_2, OBA_DoorBell_SciFi and OBA_Door_Knock_Soft suit a door.
• Make it a ding-dong: after the PlayAudioAt line, add await Sleep(_, delay = 0.6) and a second visitor.PlayAudioAt(SOUND, pitch = 0.8).
• Count the visitors: add var rings: int = 0, rings += 1 in the handler, and @right out sign = "Rings: ${rings.Value}" for a Text Decal.

How it works

Press Count goes up on each press and down on each release. on Change(holding) runs on both (Change), and holding > last keeps only the rises, so the bell rings once per press by anyone and never on a release. last remembers the count from the run before. Held would miss some presses: it stays on while anyone holds the button, so a second visitor’s press does not turn it on again, though Press Count and Character both change. $BrickOneShotAudioDescriptor/... names one of the game’s sounds. visitor.PlayAudioAt(SOUND) plays it at the visitor’s position, so players nearby hear it and players far away do not. emit rang sends a pulse out of the rang pin (Exec Pins), wired to anything with an exec input.