HeatGuard AI

How it fits together

HeatGuard AI, 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.

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

1. 01

   The whole HeatGuard AI

   A mast station measures shade air, a black globe and wind, works out heat stress, and lights a four-colour beacon for the crew.

2. 02Brain

   nRF9151 (LTE-M + GNSS)

   The brain: it runs the heatflag-fw program

3. 03

   Air temp and humidity

   Reads shaded air temperature and humidity inside a ventilated shield

   nRF9151 (LTE-M + GNSS) · I²C (4 wires) · Air °C and RH

4. 04

   Black globe PT1000

   Reads the sun's radiant heat in a 150 mm black ball

   nRF9151 (LTE-M + GNSS) · SPI (MAX31865) · Globe resistance reading

5. 

   05

   Ultrasonic anemometer

   Measures wind speed and direction with no moving parts

   nRF9151 (LTE-M + GNSS) · RS485 Modbus RTU (UART) · Wind speed

6. 

   06

   Four-tier beacon

   Shows green, yellow, red or blue and chirps for breaks

   nRF9151 (LTE-M + GNSS) · GPIO to MOSFETs, 24 V · Tier and buzzer on/off

7. 07

   LTE-M and GNSS antennas

   Sends readings to the cloud and fixes the station's position

   nRF9151 (LTE-M + GNSS) · RF antenna leads · LTE-M radio and GPS

8. 08

   Solar panel + charger

   Keeps the battery charged from a 20 W panel

   nRF9151 (LTE-M + GNSS) · Panel lead to BQ24650 · 18 V solar power

9. 09

   LiFePO4 battery

   Runs the station through the night and cloudy days

   nRF9151 (LTE-M + GNSS) · Fused 12.8 V lead · 12.8 V power

10. 10

    All connected

    8 key parts, one program, and your phone

How the parts connect

HeatGuard AI, 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 HeatGuard AI

while (1) {
    k_sleep(K_SECONDS(60));
    s.ta_rh = sht45_read();            // I2C 0x44
    s.tg    = max31865_read_pt1000();  // SPI
    s.wind  = modbus_read_wind();      // RS485
    s.hi    = heat_index(s.ta_rh);
    flag    = pick_flag(s, cfg.rules); // state rule-set + WBGT
    beacon_show(flag);                 // GPIO gates
    ring_push(&s);
    if (flag != last_flag || ++n == 5)
        mqtt_publish("hf/dev/tele", cbor(ring));
}

To your phone

How the data reaches HeatFlag Supervisor

Phone or laptop browser (PWA), crew QR page

1. Station
2. LTE-M · MQTT over TLS
3. Cloud
4. HTTPS web app
5. Phone or laptop

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing. $699 + $19/mo per station with LTE-M included; Site Pack of 4 stations + 1 LoRaWAN gateway at $3,290 + $49/mo.

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

1. 28 Oct 2026, 12:30LatestA contractor needs one thing at the site gate that checks PPE on every entry, knows who is on site when the fire alarm sounds, stops tailgating, and sets the heat flag, without a gateman. Full-height turnstiles are already standard at controlled sites (Sunbelt Rentals hires them; one US rental hub lists a 2-lane access-control turnstile at $1,875 per 4 weeks), but PPE cameras and heat stations are bought separately on their own poles, and OSHA's heat rule is still only a proposal, so sites run their own heat plans.

   • Now part of SiteOne: https://iemilabs.com/products/siteone/

   See it in 3DFull research and design

2. 27 Oct 2026, 08:59Fruit and wine growers next to woods face three jobs in the same summer: smoke from a fire in the hills, pests to count every week, and crews working in heat under California rules (shade from 80 °F, Cal/OSHA §3395; act on smoke from AQI 151, §5141.1). Agency smoke cameras cost about $50,000 a year, camera traps are sold per trap per season, and a Kestrel heat meter is about $554; our own three products for it cost $5,898 and $224 a month.

   • Combined into FieldEdge (https://iemilabs.com/products/fieldedge/); HeatGuard AI itself is unchanged

   See it in 3DFull research and design