Live budget wall
A booth header that shows your cash budget — live
For companies that buy at shows for cash — trading cards, coins, watches, sneakers, gold. The LED strip above the counter shows SPENT · SHOW BUDGET · REMAINING and changes in front of the crowd every time you buy.
- The wall is a web page, rendered on the LED wall's real pixel grid and fed over HDMI to the controller.
- The desk logs each purchase on a phone — card, amount, seller, three seconds. It writes to the cloud and to a Google Sheet automatically.
- Every purchase is a show: pixel animations, sport-specific plays, BIG BUY takeovers, an hourly giveaway, sound bytes. Idle time runs an attract loop.
- Built for a convention centre: internet by default, own hotspot as fallback, the wall never goes blank.
Try it below: confirm a purchase on the phone, then hit the demo controls.
What the desk taps when someone sells a card
Runs on any phone or tablet over the internet. One purchase = one row in the sheet + one animation on the wall.
Buyer POS
What the wall and the office see
Demo controls drive the wall above; the sheet below is what the app writes to. Nobody types in it.
Demo controls
Every button cuts whatever is playing and starts right away. Under $10,000 = standard sale animation with the sport's own play. $10,000 and up = BIG BUY takeover first. When nothing sells for 25 s the wall runs an attract loop on its own.
Google Sheet — auto-updated
Every Confirm writes a row here. Totals are formulas; the wall reads D1 and F1.
| A | B | C | D | E | F | G | |
|---|---|---|---|---|---|---|---|
| 1 | Show budget | $500,000 | Spent | $236,750 | Remaining | $263,250 | |
| 2 | B1 = budget (top-ups add to it) · D1 = SUM(D4:D) · F1 = B1 − D1 · the booth PC reads D1 and F1 every 2 s | ||||||
| 3 | Time | Seller | Card | Paid | Running spent | Remaining | Status |
| 4 | No purchases yet — confirm one on the phone. | ||||||
Internet by default. Local network as the fallback.
Sellers app (POS)
Our own app on any phone or tablet. Deal done → amount + card → Confirm. Three seconds. Works over the internet, so the desk can use any device. PIN-protected undo for fat-fingers.
Cloud + Google Sheet
The app saves every purchase to the cloud and pushes it into the Google Sheet automatically — nobody types in the sheet. The timestamped log is the cash reconciliation for the show, free. Anyone can watch from anywhere.
Booth PC → TB60 → wall
A mini PC runs this page fullscreen at 2304 × 256, HDMI into the NovaStar TB60. It reads the sheet every couple of seconds; the number animates down the moment a purchase lands, with the pixel show.
Drawn on a real wall's grid, not a mockup
This demo is configured for the wall in one real quote. Any cabinet count or pitch works — the page renders on whatever grid you have.
Example wall · from the vendor quote
- 9 × indoor cabinets, 640 × 640 mm, 2.5 mm pitch
- 5760 × 640 mm = 18.9 × 2.1 ft — that's 9:1, not 10:1
- 256 × 256 px per cabinet → 2304 × 256 px total (0.59 M pixels)
- This demo is drawn on that exact grid: 1 art pixel = 4 × 4 LEDs = 10 mm square
- ≥ 700 nits — plenty indoors; run it around 30–40 % so it doesn't wash out photos
Typical controller (NovaStar TB60) · one condition
- ✓ HDMI 1.4 input — the mini PC feeds it directly (sync mode)
- ✓ Capacity 2.3 M px, max 4096 px wide — we need 0.59 M px, 2304 wide
- ! In sync mode the TB60 scales the HDMI source to fill the screen. The PC must output exactly 2304 × 256 (custom resolution) or the text gets squashed. Confirm with your LED vendor how they map it.
- Also plays videos/images from WiFi (ViPlex) — a static fallback graphic if the PC ever dies
Ask the LED vendor before building
- Will the TB60 take a 2304 × 256 HDMI source as-is, or does it need crop/scale config?
- Do they supply the media PC, or do we bring the mini PC?
- Rigging height of the header and the cable run to the desk
- A test on the real wall before show day — not the morning of