Your day, wrapped
My lab time opens on a story of your day at the lab, one card at a time with its own music: your time today, hour by hour, your PCs and your longest sitting.
A fair turn at every lab PC.
Version
v0.1.39- Apps
- Client · Kiosk
- Decides
- One Rust server
- Runs on
- Windows PCs · NComputing
New!CARSU MYPC · End of Day Wrapped
Your day at the lab, wrapped.
Only you see it. It opens from the QR code on your own PC. Feel free to export and share wherever!
- 01
Open My lab time
At a lab PC, choose See it on my phone and scan its QR code. Your phone stays signed in for 30 days.
- 02
Play my day
Each day you use the lab becomes a story, one card at a time, with its own music.
- 03
See your day hour by hour
When you came in, the PCs you used, your longest sitting and the time left this week.
- 04
Share it
Export the wrap for your story!
New!
Lock your student ID.
Your ID number is on your ID. Without a lock, anyone who has it can sign in and use your hours.
- 01
Pick a PIN when you log out
The exit sheet asks you to lock your ID. Choose six digits only you know, or a password.
- 02
Save your recovery code
It's shown once. Write it down or take a photo.
- 03
Next time, type your PIN
Scan your ID at the kiosk as always, type the code at the PC, then your PIN.
- 04
Forgot it?
Type your recovery code instead. Lost that too? Ask the lab staff.
Your PC · sign-in
Added
Out of hours? Borrow a friend's.
Only with your friend's permission. It's their ID and their hours, so always ask first. They can say no.
- 01
You run out of hours
Your PC locks once your 5 hours for the week are used up.
- 02
Ask a friend first
Ask a classmate who still has hours left if you can use their ID.
- 03
Scan their ID at the kiosk
Once they say yes, scan their ID and pick a PC, the same way you do with yours.
- 04
Locked ID? They type the PIN
If their ID is locked, the PC asks for their PIN. Your friend types it in for you.
- 05
Keep studying
The time comes out of your friend's hours, not yours, so borrow only what you need.
Watch how it works
Walk in, sit down, start studying
Kiosk · lab entrance 
01Pick a free PC
The kiosk by the door shows every PC in the room. Green ones are free, yellow ones are about to be free, and red ones are taken. Tap the one you want.
Kiosk · check-in 
02Scan your ID, get a code
Scan your student ID or type your number, and you'll get a six-digit code. It only works on the PC you picked, and only for the next five minutes.
Client · the workstation 
03Type the code to unlock
Your PC stays locked until you enter the code. Once it's accepted, your desktop opens.
Client · signed in 
04Say hello
The PC greets you by name and shows how much time you have left. Then it moves out of the way so you can start studying.
What changed this release
A share card
Turn your lab time into a picture for your story, today or all-time, in six colours and five patterns, with or without your name, PCs and rank.
A calmer availability page
The lab's hours, a count of the PCs ready now, and every PC as its own character, the same one on the board, the student page and every wrap.
Top users stay up
This month's top PC users stay on the availability page while the lab is off, overnight and on closed days.
No more ghost sessions
A locked PC no longer shows as in use, and a session left open by a lost network ends at the last moment the PC was heard from.
See it on my phone, any time
The button appears as soon as staff turn the student page on, even mid-session, and a failed code no longer makes you wait.
Steadier backgrounds
Switching between the grove and the library no longer crashes a PC, and every PC keeps the background the Manager chose.
Wraps
Staff see how many students open their wrap: today, the last 7 and 30 days, and phones signed in now.
Seven looks to choose from
Two apps and a server
3 shipped
Client
On every lab PC
- Turns off the Windows key, Alt+Tab, Alt+F4, and Task Manager while locked
- Shows the time left and warns the student before it ends
- Greets the student by name, out loud if the lab turns it on
- Runs the living grove or the 3D CSU Library behind the lock screen
- Pauses the clock if the network drops, so no one loses minutes
- Answers remote lock, unlock, logout, and scheduled blasts
Tauri · Rust · React · Windows
Kiosk
At the lab door
- Live seat board with ready, ending soon, and in-use states
- Reads a student ID by QR code or by typed number
- Handles walk-ins and reserved seats
- Seasonal decorations that follow the calendar
- Stays on screen; only staff can close it, with a PIN
Tauri · Rust · React · Windows
Server
The one that decides
- Sends live status and commands over WebSocket
- Checks for finished sessions every 10 seconds and locks those PCs
- Helps PCs and kiosks find it on the lab network
- Runs scheduled blasts on time, and skips any it missed
- Closes leftover sessions after a power cut and charges only the time used
- Stores lab records in SQLite with crash-safe writes
Rust · Axum · Tokio · SQLite
Student availability portal
Live workstation status
Everything goes through the server
Inside the lab
workstations
Client PCs
one Client per PC or NComputing seat
at the door
Kiosk
check-in and the live seat board
UDP discovery · WebSocket
The server
the only record
CARSU Server
Rust · Axum · Tokio
Lab database
students and sessions
Settings database
how the lab is set up
The life of one session
6 steps
- 01Kiosk → Server
Ask for a seat
The kiosk sends the student's ID and the PC they picked. The server checks that the student exists, isn't banned, and has time left, and that the PC is free.
- 02Server → Kiosk
Issue a one-time code
The server creates a six-digit code tied to that student and that PC. It works once and expires in five minutes.
- 03Client → Server
Unlock the PC
The student types the code on the PC. The server checks it against that machine, marks it used, and starts a session that ends when the student's time does.
- 04Server → everyone
Tell the room
The new state goes out over WebSocket. The kiosk's seat board and the public availability page both update without a refresh.
- 05Client ↔ Server
Stay in touch
The PC reports that it's alive and which app is in front. If the connection drops, its clock pauses, and the server adds that time back when it reconnects.
- 06Server → Client
Lock when time is up
Every 10 seconds the server looks for finished sessions. When it finds one, it locks that PC, records the minutes used, and frees the seat.
Work the server does on its own
Session expiry
every 10 s · locks PCs whose time is up
Room statistics
every 10 s · occupancy for the seat board
Scheduled blasts
every 5 s · runs due schedules, skips late ones
LAN discovery
UDP 41234 · helps paired devices find the server
Outage repair
at startup · closes sessions cut off by a power loss
Background and notices
on change · pushed to connected PCs at once
What it keeps in SQLite
01
Students
Directory, weekly quota, validation, bans
02
Sessions
Start, end, paused time, and why it ended
03
Clients
Each PC's state, heartbeat, and hardware
04
Endorsed machines
Approved devices and their signing keys
05
Access tokens
One-time codes for an assigned student
06
Reservations
Booked seats and attendance
07
Tamper events
Unexpected disconnects for staff review
08
Scheduled blasts
Schedules and their last 100 runs
09
Greeting clips
Pre-made welcome audio, per first name
10
Browser approvals
Approved browsers, sessions, and audit log
Every command is checked
01
Only known PCs
Each PC is approved once and gets its own signing key. The server ignores status and refuses commands from any machine it hasn't approved.
Device keys02
The server double-checks staff
Sensitive actions need an admin credential that the server checks itself. A button on a screen isn't enough on its own.
Checked on the server03
Sealed recovery data
Each PC encrypts its recovery data with the server's public key. Only the server's private key can open it.
Public-key sealed