Meeting room display on a cheap tablet: door signs from your calendar

What a good door sign shows

People glance at a door sign for one second, so it has to answer one question instantly: can I walk in? The whole tablet turns green when the room is free and red when it is busy, with the room name, the current meeting and “until 14:00” in big type, and the next booking below. Anything more — logos, weather, a slideshow — is clutter on an 8 inch screen at a doorframe.

The Meeting room widget does exactly this in its door-sign design, with card and strip designs when the room status is part of a bigger lobby screen instead.

Choosing the tablet

Almost any Android tablet from the last five years works: the player runs the same on a €90 Lenovo or Samsung tablet as on a €600 one. Look for an 8 to 10 inch screen (8 inch fits most doorframes), Android 9 or newer, a decent brightness figure for a lit corridor, and a charging port on the side that faces where the cable will run. If you have Ethernet at the door, a tablet with a USB-C hub and Power-over-Ethernet adapter avoids both Wi-Fi and a wall socket.

Second-hand tablets are fine; a door sign uses almost no CPU. Buy one spare so a failed unit is swapped in a minute — the pairing code takes care of the rest.

• 8–10 inch, Android 9+, ≥ 400 nits in bright corridors
• Side-facing USB-C port; PoE adapter if there is Ethernet
• Use the Android tablet player: APK or the browser player in kiosk mode

Getting the calendar link (ICS)

The widget reads the room's calendar through an ICS link, which every calendar system can publish. In Google Workspace, open Google Calendar on the web, find the room resource (or the room's own calendar), open its settings and copy the “Secret address in iCal format”. In Microsoft 365, open Outlook on the web, Settings → Calendar → Shared calendars → Publish a calendar, choose the room's calendar and copy the ICS link. Nextcloud and most other systems have a similar “subscribe/export as ICS” option.

Treat the link like a password: it shows meeting titles to anyone who has it. The widget only reads it from the PlainSignage server and refreshes every minute. If you'd rather not show titles, the widget can display just Free/Busy and the time.

• Google Workspace: calendar settings → Secret address in iCal format
• Microsoft 365: Outlook → Settings → Calendar → Shared calendars → Publish
• Refresh: every 60 seconds; bookings made from a phone show within a minute

Setting up the widget

Create a playlist per room (or one playlist with the room name as a variable is not needed — a playlist per room is the simplest). Add the Meeting room widget from the Hospitality & office category, paste the ICS link, type the room name and choose the door-sign design. Set the free and busy colours to match your office if you like, and switch on “show next booking”. Publish, then pair the tablet: open the app, enter the six-letter code in the console under Screens, and assign the playlist. Set the screen orientation to portrait if the tablet hangs vertically.

Use the console's screen hours to switch the display off outside office hours; the tablet wakes by itself in the morning.

Mounting and power

A flush wall mount next to the door at eye height (about 150 cm to the centre) is the standard. Tablet wall mounts with a lockable frame cost €25–60 and hide the port; a recessed cable run to a socket above the ceiling tiles keeps it tidy. In glass-walled rooms, mount on the glass with an adhesive frame or on the adjacent wall. Angle it slightly towards the corridor.

Power is the part people underestimate: a tablet on a wall must be charged permanently. Use a short cable and a wall socket, or PoE through a USB-C splitter. Set the tablet's display to never sleep and screen timeout to “never”; the player keeps the panel awake anyway.

Kiosk mode: keep people out of the tablet

Android's built-in screen pinning (Settings → Security → App pinning) locks the tablet to the player app; leaving it requires holding two buttons and the PIN. That is enough for most offices. For a tamper-proof setup, a kiosk launcher such as Fully Kiosk or a mobile-device-management profile (Google Workspace's Android management works for tablets too) locks the home button, blocks notifications and reboots the tablet nightly.

Because the tablet never needs to be touched — bookings come from calendars — kiosk mode is mainly about stopping curious fingers, not about function.

What it costs per room

Dedicated room-booking panels typically cost €500–1000 per room plus a licence of €10–25 per room per month, before mounting. The tablet route: a €90–150 tablet, a €30 mount, and PlainSignage at €4.99 per room per month once the first screen (€14.99) is covered — so ten rooms are €59.90 per month in software, and the same account also runs your lobby screen and any other TV. Every widget is included; there is no room-display add-on.

The trade-off is honest: dedicated panels often add a “book now” button on the panel itself. With PlainSignage people book in the calendar they already use, which in practice is how most rooms get booked anyway. See the pricing page and the office dashboard for a lobby setup that shows all rooms at once.

• Tablet €90–150 + mount €30 per room, one-off
• €14.99/month first screen, €4.99/month each additional room
• No add-ons; the same plan runs the lobby screen