Build dedicated
devices with
JavaScript.

1// The settings the operator typed in the portal
2const name = Arda.config.kiosk_name ?? 'Reception'
3
4// A synced dataset — asking is subscribing
5let members = await Arda.db.dataset('members')
6Arda.on('sync', async (ds) => {
7  if (ds === 'members') members = await Arda.db.dataset(ds)
8})
9
10// A badge scanner is a keyboard wedge; the player knows which one
11Arda.on('barcode', async (s) => {
12  const m = members[s.text]
13  if (!m) return refuse()
14  // Durable: queued on disk, delivered when the line is back
15  await Arda.db.push('visits', { member: m.id, kiosk: name, at: Date.now() })
16  welcome(m)
17})

1// A manager's override on a till with no keyboard
2const pin = await Arda.keyboard({ layout: 'pin', title: 'Manager PIN' })
3if (pin === null) return                     // cancelled
4
5// Print: the player owns the port, you own the bytes
6const [p] = (await Arda.printers.list()).filter(x => x.usable)
7await Arda.printers.print(p.id, escpos(receipt, { dots: p.dots }))
8
9// The customer display speaks its own protocol over USB-serial
10const [vfd] = await Arda.serial.list()
11await Arda.serial.open(vfd.id, { baud: 9600 })
12await Arda.serial.write(vfd.id, encode('TOTAL  £12.99'))
13
14// Let an update in only between sales
15Arda.on('updateStart', () => {
16  if (midSale()) { Arda.update.pause(); afterSale(Arda.update.apply) }
17})

1// A second display is a real document you write into
2await Arda.screens.ready()
3const board = Arda.screen['queue']
4const now = document.createElement('h1')
5board.body.appendChild(now)              // adopted, still yours
6now.textContent = 'A 042 → Room 3'
7
8// Whatever the connected screen allows
9await Arda.screens.set(null, { brightness: 40 }, true)   // and again at every boot
10await Arda.audio.set({ volume: 35 })
11
12// Lay the app out for the machine it is on
13const { can } = await Arda.device()
14document.body.classList.toggle('touch', can.touch && !can.keyboard)
15
16// Close the shop
17closeBtn.onclick = () => Arda.system.shutdown()