ClassOne

How it fits together

ClassOne, part by part

Scroll or tap a part. Press “See the 3D CAD design” to watch the model, built from our CAD, light each part up and show how it connects.

See the 3D CAD designShow the concept

Real-time 3D render · drag to rotate · final design may varySwipe sideways to rotate

1. 01

   The whole ClassOne

   The front whiteboard is the classroom's own helper: two head-counting cameras, a CO2 and sound sensor and a tap-in reader inside the header rail and pen tray feed one brain that checks the register, runs the timer and group rotations, calls noise and air, counts the room clear in a drill, shows each call on its time bar with a voice, and sends the teacher one summary.

2. 02Brain

   Raspberry Pi 5 (in the header rail)

   The brain: it runs the classone-fw program

3. 

   03

   Two room cameras

   Count heads at the desks, the door and the group table, and the room clear in a drill; never identify a face

   Raspberry Pi 5 (in the header rail) · 2 x CSI-2 ribbon · Frames every 10 s, counted on the board, never stored

4. 

   04

   Tap-in reader

   Pupils tap their card on the pen tray's left end as they come in: the names for the register

   Raspberry Pi 5 (in the header rail) · I²C (cable up the board's side frame) · Card IDs

5. 05

   Air sensor

   CO2, temperature and humidity for 'open the window' (1,500 ppm BB101, 1,100 ppm California) and too hot or cold

   Raspberry Pi 5 (in the header rail) · I²C · CO2 ppm, °C, % RH every 30 s

6. 06

   Sound level mic

   Measures the room's sound level and hears the fire alarm tone; records nothing

   Raspberry Pi 5 (in the header rail) · I²S · Sound level (dB) and alarm tone flag

7. 07

   Time bar, call light and voice

   The class time bar across the header, each call's colour, and the voice: 'blue group, your turn', 'time to open a window'

   Raspberry Pi 5 (in the header rail) · One data wire + I²S · Time left, call colour, voice

8. 08

   Secure element and tamper switch

   Signs each call and the register; marks the log and turns the cameras off if the header cover is opened

   Raspberry Pi 5 (in the header rail) · I²C + GPIO · Signatures, tamper flag

9. 09

   All connected

   7 key parts, one program, and your phone

Our circuit board · rev A-0

One board of our own inside ClassOne

Every chip on one board we design, shaped to fit: the processor, cameras and sensors, Wi-Fi and Bluetooth, lights, sound and power. No plugs, ribbons or adapters. It is checked in our CAD against every part around it, and it arrives from the maker ready to run our software from a microSD card. Turn the model, or pick a part below to see where it sits.

Demo · 6 real-world moments

See ClassOne work

Short animated scenes of real moments: what happens today, what ClassOne does about it, and what lands on your phone. The same scenes play in the IEMI app.

Demo scenes show how ClassOne and its app are designed to behave. ClassOne is in design; nothing here is recorded from real equipment yet.

The idea

The classroom whiteboard counts the class in, keeps the time, watches noise and air, and gives the teacher one summary

How the parts connect

ClassOne, wired up

Every part, what links it to the brain, and how the data reaches your phone. A solid line is a cable; a dashed line is a radio link.

The program

What controls ClassOne

while True:
    taps.update(nfc.read())                     # PN532, I2C
    db = mic.level_dba(); alarm = mic.alarm_tone()
    if tick(10): heads = merge(count(camL.frame()), count(camR.frame()))
    if tick(30): air = scd41.read()
    calls = register_rule(taps, heads, bell.now()) + timer_rule(plan)
    calls += noise_rule(db, plan.activity) + air_rule(air) + drill_rule(alarm, heads)
    for c in calls:
        if c.conf < c.line: c.kind = 'check'     # never guess
        atecc.sign(c); bar.show(c); voice.say(c); day.add(c)
    bar.time_left(plan.remaining())
    time.sleep(1)

To your phone

How the data reaches ClassOne teacher app

Teacher phones and the school's tablets (Android and iPhone)

1. Whiteboard
2. School Wi-Fi (WPA3-Enterprise) · MQTT over TLS
3. IEMI cloud (the school's account)
4. Push
5. Teacher phones and the office

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing (stage 2, 28 Oct 2026). Bought separately, a plain whiteboard (about $400, est.), a Time Timer (about $42), a Yacker Tracker noise light (about $157), an Aranet4 CO2 monitor (about $190 to $250) and a tap-in attendance reader (about $300 + $5/month, est.) add up to about $1,150 + $5/month. Parts cost about $729 per classroom at qty 1 including the board (SCD30 CO2 sensor 29 Oct 2026, est.; other prices checked 28 Oct 2026; board est.).

Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.

1. 4 Nov 2026, 03:20LatestA school buys ClassOne as the classroom whiteboard it already needs (a framed 2,400 x 1,200 board to EN 14434, on the front wall, under the ADA 100 mm protrusion limit), and in California the CO2 monitor must sit 3 to 6 ft up, 5 ft from doors and windows, within 75 ppm at 1,000 ppm (Public Utilities Code 1625). So the electronics must be boards an assembly house makes and tests the same way every time, inside the board's own header rail, side frame and pen tray, with nothing plugged together inside.

   • What we designed: one rigid-flex piece in the header rail and three small boards. The 8-layer main board lies flat on the rail floor with the RK3576J and a heat block into the aluminium rail (the 2.4 m extrusion is the heat sink), memory, the security chip, the microSD card with our software, the speaker amp and the camera supplies. Two small camera tabs hang off its front edge on flex hinges, each with an 8 MP camera chip whose lens passes through the opal cover to just inside its face, turned 30 degrees out and 20 down. A 640 mm light strip stands behind the cover with the 96-LED time bar, the Wi-Fi module and a magnet-held tamper sensor. A mic tab sits over the rail's mic port. At the rail's end an inlet tab takes the USB-C power; in the side frame, 4.5 ft up, an air board carries the CO2 chip; under the pen tray lid a tray board carries the NFC chip and its printed coil. It replaces the Raspberry Pi 5, two camera modules, the SCD30 module, the PN532 board, 12 LED sticks and four other bought boards. See /build/classone-boards
   • How we checked it: the boards are written as code and opened in KiCad (0 design-rule violations). The code places 144 parts at their sizes and checks each sits on its board inside the rail, the pocket or the tray with no overlaps and fits its height; in 3D, that each camera tab, holder and lens stays clear of the cover, the rail floor, the main board and the light strip; that every call in the design (front and back desks on both sides, the centre, the back corners, the reading-group table and the door) is inside its camera's view; that each lens's view clears its window; the CO2 height for the California rule; the mic over its port; the USB-C in its hole; and the lead drops and bus length. Design review with the shared rules: 16 pass, 1 fixed, 10 to prove, 0 fail. A pupil's head at the back seat, 7.6 m away, fills about 43 pixels against a 20-pixel need. A 3D model shows the boards in a see-through whiteboard or laid flat, and the quote pack and design files are on the board page
   • What we learned: a camera in a wall-mounted header sees a door at the front corner almost along the wall: the line of sight runs 80 degrees from the cover. With our lens sitting in the cover that costs little, but the far side of the lens rim still needs room, so both camera windows now open outward (30 x 30 to 63 x 34, drawn in the whiteboard CAD the same day); both, because the door can be on either side of a real classroom. The bench SCD30 module gives way to Sensirion's SCD43 chip soldered on our air board; its accuracy against the 75 ppm rule is read from the data sheet and checked against a reference meter on rev A. About $165 a whiteboard in electronics at 1,000 (est.), about $135 less than the bench boards
   • What is next: the rev T whiteboard CAD with the boards inside, the camera brackets, the magnet pockets and the side frame's cable channel, every part checked in 3D; the tap-in read range through the lid; Wi-Fi from inside the rail; and the next product's board, FarmOne

   See it in 3DFull research and design

2. 29 Oct 2026, 23:19A school needs a classroom CO2 reading the teacher can act on. California's classroom rule (Public Utilities Code 1625) asks for a monitor 3 to 6 feet up the wall, an alert above 1,100 ppm, the day's peak kept, and accuracy within 75 ppm at 1,000 ppm; UK schools follow BB101's 1,500 ppm guide.

   • Market and rules check (DESIGN.md): California PUC 1625 (AB 841) classroom CO2 monitor rule, the 2024 CALGreen proposal, BB101 unchanged, and 2026 face-recognition attendance cameras, each with what it changes in ClassOne (sources C1-C8)
   • Found: the rev A SCD41 is about ±90 ppm at 1,000 ppm (limit 75) and sat about 2.0 m up in the header (limit 6 ft), so it failed two California points
   • CAD: the air sensor is now a Sensirion SCD30 (±60 ppm at 1,000 ppm) in a pocket in the board's left side frame at 4.5 ft behind six vent slots, 4.7 m from the door; the CAD asserts both distances; fit check and assembly check pass, no floating parts
   • App: a California setting calls "open the window" at 1,100 ppm, shows the day's peak and flags any room over 1,100 ppm more than once a week; BB101 1,500 ppm stays the default
   • Parts about $729 at qty 1 (+$9, est.); price kept at $1,090 + $4/mo; BOM, buy list, wiring, rules, demo scene and page updated: https://iemilabs.com/products/classone/
   • Next: test the SCD30 against a reference instrument at 1,000 ppm in the first build; close-out C9 (recommend the first product to the owner) from 30 Oct 00:00

   See it in 3DFull research and design

3. 28 Oct 2026, 23:50A primary classroom needs the register checked, the time and reading groups run, noise and stale air called and the room counted clear in a drill, while the teacher sits with one group: today that is a Time Timer ($41.95), a Yacker Tracker noise light ($156.50), an Aranet4 CO2 monitor (about $190-250) and a tap-in reader, each its own box (maker and supplier prices, Oct 2026).

   • Buyer check with sources: what schools pay today for a timer, a noise light and a CO2 monitor, and the three closest products (HALO 3C room sensor at $713.99, interactive panels at about $2,700-3,600, classroom CO2 sensor platforms)
   • What we learned: schools already pay about $700 per room for a sensor that only watches, so a board that also runs the room is in range; noise lights cost about $157, not the $100 we guessed
   • Brain changed: the Raspberry Pi 5 4 GB now costs $130 (was $60), so the board uses the 2 GB model at $90 on the same board outline; the CAD fit and all 12 camera views are unchanged
   • Parts list prices checked on shop pages today: $720 of parts per classroom at qty 1; cost and margin table in the design notes (about 23 % at qty 1 and 43 % at qty 100, est.)
   • Price raised from $990 to $1,090 + $4 a month per classroom, still under about $1,150 + $5 a month for the separate items
   • Product page: the first three FAQs answer the buyer's top questions (why not a CO2 monitor, noise light and timer, does it recognise faces, what it costs)
   • Next: three questions for schools in customer reviews (price against a room sensor, cameras or taps only, which job matters most), then AisleOne for retail

   See it in 3DFull research and design

4. 28 Oct 2026, 07:41A primary classroom needs one thing that checks the register, keeps the time for the class and the reading groups, watches noise and stuffy air, and counts the room clear in a drill, without face recognition. Schools buy these as separate gadgets today (Time Timer, Yacker Tracker, Aranet4 CO2 monitors); BB101 asks for CO2 under 1,500 ppm on average, and New York banned facial recognition in schools in 2023 (NYSED).

   • New CAD: the 2,400 x 1,200 whiteboard with a 70 x 80 mm header rail and 70 x 45 mm pen tray, a printed opal header cover and a tray lid; Raspberry Pi 5 brain, two Camera Module 3 Wide room cameras (heads only), SCD41 CO2 sensor, sound mic, 12-stick time bar, speaker, secure element and tamper switch in the header, NFC tap-in reader in the tray; 21/21 parts fit from datasheets, 12 camera views checked, 70 mm from the wall (ADA 100 mm limit), no collisions, no floating parts
   • equipment.json: ADA 307.2, EN 14434, 5 V only, no biometric identification (GDPR Article 9, NYSED 2023), FERPA and BB101 rules; 7 calls (5 alone), 3 impact cases and every security key
   • idea.json classroom plan, integration.json (6 parts, 5 app screens with a 'no teacher at the front' mode), bom.csv (about $682 a classroom), buy.json with 8 key parts
   • New product page at /products/classone/ in Education: $990 + $4/month against about $1,094 + $5/month bought separately (est.); no IEMI product folded (IEMI Gecko stays listed)

   See it in 3DFull research and design

Smart equipment · legal on the field

ClassOne is the classroom dry-wipe whiteboard, made smart

It replaces the class's existing front whiteboard, at the same place on the front wall, with every part built in. Everything inside the board: brain, two room cameras, CO2 and sound sensor, time bar, speaker, secure element and tamper switch in the 70 x 80 mm header rail; the tap-in reader in the pen tray's left end. About +1.2 kg over a plain 2,400 x 1,200 board (est.); no timer, noise light, CO2 monitor or attendance reader on the walls or the desk.