Entrance camera that checks hard hat, hi-vis and harness on approach
Software: $29 per month per head
Concept, not for sale yet. Tell us if you want it; that decides what we build.
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How it fits together
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01
The whole PPE Gate AI
A camera feeds the hub, which checks hard hats and vests; a light tower at the door shows green, amber or red and speaks.
02Brain
WT32-ETH01 (Prompt Tower)
The brain: it runs the prompt-tower-fw program
03
PoE camera
Films the approach to the door for the hub's PPE check
WT32-ETH01 (Prompt Tower) · PoE Ethernet to the hub · RTSP video
04
LD2410C radar
Senses someone approaching and how far away they are
WT32-ETH01 (Prompt Tower) · UART, 256000 baud · Presence and distance
05
Three NeoPixel sticks
Show red, amber or green through three windows
WT32-ETH01 (Prompt Tower) · GPIO data pin, level shifter · Colour data
06
MAX98357A amplifier
Plays English and Spanish voice prompts from flash
WT32-ETH01 (Prompt Tower) · I²S (3 wires) · Digital audio
07
40 mm speaker
Speaks the prompt behind the front grille
WT32-ETH01 (Prompt Tower) · Speaker wire from amp · Amplified audio
08
PoE splitter
Takes one Cat6 cable and gives 12 V plus data
WT32-ETH01 (Prompt Tower) · PoE Ethernet · Power and network
09
5 V buck regulator
Powers the board, lights, amp and radar
WT32-ETH01 (Prompt Tower) · 5 V power lead · Power
10
All connected
8 key parts, one program, and your phone
What it is
A safety-yellow camera head over a site entrance that checks PPE and gives a light and voice prompt.
What it does
Who it's for
Construction firms, mines, factories and warehouses with controlled entrances.
How the parts connect
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
for (;;) {
radar = ld2410.read(); // UART2, 256000 baud
if (radar.present)
mqtt.publish("local/ppegate/tower/<id>/radar", radar.json());
if (mqtt.has("prompt") && prompt.age_ms() < 4000) {
leds.show(prompt.state); // red / amber / green
if (prompt.is_new()) i2s.play(prompt.voice, prompt.lang);
} else if (millis() - last_mode_ready > 5000) {
leds.pulse_amber(); // fail-visible, never green
}
if (millis() - last_health > 60000) mqtt.publish_health();
}To your phone
Browser, plus Teams or SMS messages
One screen for each job PPE Gate AI does.
Door promptA truck driver walks toward the yard door without a hard hat. The light turns red and a voice reminds him in English or Spanish.
Prompt clusterAt shift start, five people in a row reach the dock door without vests. The site manager sees the cluster and puts a vest rack there.
Gate healthA bumped mount or a dirty lens can blind a door. If its camera stops sending, the supervisor hears about it within ten minutes.
App screens with sample data. The interface is in development.
| Entries by result | 12: 9 green, 2 amber, 1 red | Every 5 min |
|---|---|---|
| Red by item | 1 hard hat | Every 5 min |
| Cluster alert | 5 reds for vests in 15 min | When it happens |
| Gate offline alert | Camera stale 10 min | When it happens |
| Weekly report | Mon 07:00 | Weekly |
No faces, no identity, no audio and no images leave the site. Only anonymous five-minute counts go to the cloud.
CAD design · Design complete (stages 1–6), not built
| AI processor | Hailo-8L (13 TOPS) + ARM host |
|---|---|
| Camera | Sony IMX678 8 MP low-light sensor with ~100° lens |
| Sensors | 60 GHz mmWave radar approach trigger · Ambient light sensor |
| Connectivity | Ethernet (PoE+) · Wi-Fi · Optional LTE for sites without a network · Dry-contact output (advisory only, not an access interlock) |
| Power | PoE+ (802.3at) or 12–48 V DC |
| Enclosure | Safety-yellow wedge-shaped head angled 20° down, black front bezel, 3-segment LED light bar under the lens and a speaker grille on the side; wall or 50 mm pole bracket, optional 2.4 m mast with 40 × 40 cm weighted base |
| Dimensions | Head 28 L × 12 W × 10 H cm; mounted at 2.3–2.6 m; optional 2.4 m mast with 40 × 40 cm base |
| Ingress rating | IP66 (target) |
| PPE classes | Hard hat, hi-vis, harness; glasses and gloves best-effort |
|---|---|
| Mounting height | 2.3–2.6 m looking down the approach |
| Trigger | 60 GHz mmWave radar approach sensing |
| Accuracy | Per-class results to be published after pilots |
| Light bar | 3-segment green / amber / red |
|---|---|
| Voice | Configurable prompts, multiple languages |
| Dry contact | Advisory output; not a safety or access interlock |
| Data | Anonymous counts by default; blurred clips optional |
| Power | PoE+ (802.3at) or 12–48 V DC |
|---|---|
| Head | 28 × 12 × 10 cm, safety-yellow ASA |
| Ingress | IP66 (target) |
| Operating temp. | −20 °C to 55 °C (target) |
Targets for production units; they may change during development.
Hardware: $899 per gate head
Software: $29 per month per head
Target pricing. Site pack of 3 heads + dashboard at $2,490 + $79/mo. Optional mast and LTE quoted separately.
$899 + $29/mo per head
One entrance with PPE prompts and anonymous reporting.
$2,490 + $79/mo
Three heads for a site's main gate and key zones.
Custom
For contractors and operators with many sites.
Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.
Community
PPE Gate AI is in development. Rate the idea, tell us what to change about the features, specs or price, and we'll build it with your feedback.
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Questions
Tell us what this would save you, or ask anything. We reply within two business days.
A member of the IEMI Labs team will reply within two business days.
From the product lab · ideation phase
No. PPE checks run on the head and video is not stored by default. Faces and bodies are blurred on the device before any optional clip is saved. There is no face recognition, no badge linking and no identity, and the system does not infer emotion, fatigue or attention. The dashboard shows anonymous counts by gate and shift.
No. It is a reminder and reporting aid, not a safety-rated system, and it does not ensure compliance. The dry-contact output is advisory and is not an access-control or safety interlock. CE/UKCA/FCC certification testing is planned, and the IP66 rating is a design target until lab-tested.
Mount the head on a wall or a 50 mm pole at 2.3–2.6 m looking down the approach and connect PoE+ or 12–48 V DC. For open sites, an optional 2.4 m mast with a weighted base needs no fixings.
Prompts work on the head with no network. Counts and reports upload over Ethernet, Wi-Fi or the optional LTE module.
No. It is in development and the specifications are targets. It is a concept: we are not taking orders, reservations or deposits, and it has no ship date yet.
We are planning a 2-year limited hardware warranty covering manufacturing defects. Final terms will be published before shipping begins.
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