AlarmEcho

How it fits together

AlarmEcho, 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 AlarmEcho

   A ceiling disc listens for your smoke or CO alarm and tells a plug-in Link, which alerts you over Wi-Fi or LTE-M.

2. 02Brain

   ESP32-S3-MINI-1

   The brain: it runs the Echo disc firmware program

3. 03

   PDM microphone

   Hears the alarm and wakes the disc from sleep

   ESP32-S3-MINI-1 · PDM data and wake pin · Digital sound, wake signal

4. 04

   12-LED light ring

   Shows red for alarm heard, amber for low battery

   ESP32-S3-MINI-1 · GPIO data line · LED colour data

5. 05

   Test button

   Pairs the disc, runs self-test and learns your alarm

   ESP32-S3-MINI-1 · GPIO pin · Button presses

6. 

   06

   2 lithium AA cells

   Power the disc for years through a buck-boost

   ESP32-S3-MINI-1 · 3.3 V supply rail · Power

7. 

   07

   Echo Link hub

   Receives disc alerts and sends them on

   ESP32-C6-MINI-1 · BLE 5 coded PHY, encrypted · 24-byte event frames

8. 08

   LTE-M modem

   Sends the alert when Wi-Fi or power is down

   ESP32-C6-MINI-1 · UART · Modem commands, MQTT data

9. 09

   All connected

   7 key parts, one program, and your phone

The idea

A small disc beside each alarm a rental unit already has tells the landlord the day it starts to chirp

How the parts connect

AlarmEcho, 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 AlarmEcho

while (true) {
    esp_light_sleep_start();               // T5838 WAKE pin ends the sleep
    pdm_capture(pcm, FRAME_32MS);          // PDM to PCM, 16 kHz
    tone = goertzel_bank(pcm);             // 400-700 Hz and 2.8-4 kHz
    env  = envelope_update(tone);          // 20 ms on/off steps
    ev   = grammar_match(env);             // T3 smoke, T4 CO, chirp
    if (ev != EV_NONE) {
        conf = cnn_score(pcm);             // ESP-DL int8 model
        if (conf < 0.5) ev = EV_ALARM_POSSIBLE;
        ble_send_event(ev, seq++);         // AES-CCM, retry 30 s
    }
}

To your phone

How the data reaches AlarmEcho app and manager dashboard

iPhone, Android or browser

1. Echo disc
2. BLE 5 coded PHY
3. Echo Link
4. Wi-Fi or LTE-M · MQTT over TLS
5. IEMI cloud
6. Push · SMS · voice call
7. Phone

Key specs

Targets for production units; they may change during development.

Pricing

Target pricing. App alerts need no subscription. The optional LTE-M module price is to be confirmed.

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

1. 28 Oct 2026, 14:25LatestA landlord with 10 to 500 rental doors needs to hear about a low-battery chirp the day it starts, before the tenant calls after hours or pulls the battery; Kidde's survey found 7% would rather disconnect the battery than replace it (sources in DESIGN.md).

   • Drawn idea plan (idea.json): a two-bedroom rental unit from above with the hallway, both bedrooms, bathroom, kitchen and living room; one numbered pin per disc beside each existing alarm and one for the Echo Link hub in a living-room outlet
   • The product picture is now this drawn plan instead of the plain fallback card; drawn from the rev A design notes, not the CAD
   • What we kept from the market work: the listed alarm stays the safety device; AlarmEcho is a notifier and a maintenance log
   • Next: drawn plans for more catalogue products that still show the fallback card

   See it in 3DFull research and design

2. 27 Oct 2026, 01:58Owner decision (27 Oct 2026): merge our single-job products into multi-job devices.

   • New product page: https://iemilabs.com/products/kitchenguard/

   See it in 3DFull research and design