Small devices that listen, watch, and alert on behalf of your store

Delivery-Alert Chime Hub

Phone notifications become the store chime

Detects delivery-order notifications on the owner's phone and rings the store chime. One phone covers several stores at once, and an hourly delivery count arrives on Telegram.

Signal flow

Order app alert→Owner's phone→Cloud signal→Store hub→Store chime

Signal path

Phone → cloud push → store hub

Stores

Multi-store from one phone

Reporting

Hourly delivery count · Telegram

Self-monitoring

30-min heartbeat · auto link recovery

Updates

Wireless (no store visit)

Verified

82 alerts over 4 days · 0 delayed

※ Includes a confirm-off routine that recovers a chime left ringing.

Store Audio Selector

Music keeps playing, alerts ride on top

Streams phone Bluetooth music to the store amplifier. When a delivery alert arrives, the music dips briefly, the chime plays over it, and the volume returns. If the device loses power it falls back to the existing wired input, so the audio never goes silent.

Signal flow

Phone Bluetooth→Audio board→Store amplifier

Inputs

Bluetooth · wired AUX

Outputs

3.5 mm · RCA L/R · mono amp

Alert handling

Music ducked −12 dB + chime overlay

Fail-safe

Wired input passes through on power loss

Line level

Matched to about 0.65 Vrms

Watchdog

Reverts to wired + backup buzzer if hub goes quiet

※ Receives the same signal as the Delivery-Alert Chime Hub. With both installed, the chime and the store speakers sound together.

Wireless Notice Display

Panels need only power, text comes from one place

Text sent from a single host appears on every notice panel in the store at once. No per-panel setup and no cables. Panels stay dark until touched.

Signal flow

Host→Wireless broadcast→Panel 1 · 2 · … N

Wireless

Long-range BLE (Coded PHY)

Topology

1 host → N panels

Install

Power only · no per-panel setup

Display

Wakes on touch

Korean text

Supported (line wrap handled by host)

Link quality

95%+ reception · −90 dBm

※ Adding panels needs no host changes. Plug in power and the panel receives the same text.

POS Remote Bridge

See and operate the POS from outside the store

A board that reads the POS screen with a camera, operates it through keyboard signals, and receives barcode-reader input. The server does the thinking; the board is only eyes, hands, and ears. It never touches the POS network and connects over a separate line.

Signal flow

POS screen→Camera→Server reads→Keyboard signal→POS

Eyes

5 MP autofocus camera

Hands

USB keyboard signals

Ears

Barcode-reader input

Network

Isolated from POS · separate line

Decisions

Server side (board only executes)

Use

Price lookup · pre-entry for inter-store transfers

※ We built the board instead of using an off-the-shelf remote KVM so one device could also take reader input.

Store Alert Hub

Open doors, temperature, orders — one voice

When a fridge door is left open, a temperature drifts, or an order arrives, one hub with a built-in speaker tells you. Sensors run one to two years on a battery and need no pairing or cloud account.

Signal flow

Door · temp/humidity sensors→Hub (speaker built in)→In-store alert

Alert

Built-in speaker · voice/chime

Sensors

Wireless door · temperature/humidity

Sensor battery

1–2 years

Setup

No pairing · no cloud

App

3 roles: detect · ring · view

Form

Hub unit or a spare phone

※ Sensors added on top of the frame proven by the Delivery-Alert Chime Hub.

Fridge & Warmer Temperature Logger

Fridge temperatures, without anyone writing them down

Wireless temperature/humidity sensors report to the hub, and the hub stores the log. Out-of-range readings alert immediately, and the daily log sheet builds itself. Adding a sensor means adding power, nothing else.

Signal flow

Temp/humidity sensor→Hub log→Alerts · daily log sheet

Sensors

Wireless temp/humidity · 1–2 yr battery

Logging

Stored on hub · daily sheet automatic

Alerts

Immediate on out-of-range · Telegram

Add sensor

Power only · no setup

Storage

Hub only · no server

Review

Graphs on your phone

※ Shares sensors with the Store Alert Hub. If the hub is already there, just add sensors.

Entry Counter

How many came, and who came at night

Counts door openings by hour using a door sensor. During unattended late-night hours, any door opening alerts immediately. Runs on the hub alone, no phone needed.

Signal flow

Door sensor→Hub count→Hourly counts · night alert

Sensor

Wireless door · 1–2 yr battery

Counting

Entries per hour

Night alert

Immediate on door open during unattended hours

Operation

Hub alone · no phone

Report

Daily summary on Telegram

Install

Stick to the door frame

※ Uses the same hub as the temperature logger. Only the sensor type differs.

Store Announcement Scheduler

Announcements run on a timetable

Plays scheduled announcements automatically. Upload audio from your phone and set the timetable. If a delivery alert arrives mid-announcement, the alert plays first.

Signal flow

Audio · timetable from phone→Audio board→Store speakers

Schedule

Automatic playback by time slot

Audio

Uploaded from phone

Priority

Alert > announcement > music

Board

Same as the Store Audio Selector

Outputs

3.5 mm · RCA · mono

Fail-safe

Wired input passes through on power loss

※ The audio selector plus a timetable. Same board, different firmware.

Multi-Store Status Board

Several stores, one phone screen

See hub status, today's delivery count, and alert history for every store on one phone screen. Based on the 30-minute heartbeat, you can tell at a glance which store's hub has dropped off.

Signal flow

Store hubs→Cloud→One phone screen

Scope

No limit on store count

Shows

Hub status · deliveries · alert history

Drop detection

Based on 30-min heartbeat

Alert

Telegram the moment a hub drops

App

The 'view' role of detect · ring · view

Devices

Android · iPhone (view)

※ Collects the heartbeats the Delivery-Alert Chime Hub already sends.

Network PC Control Relay

One LAN cable to power, view and operate a PC

A small box beside the store PC. It connects to the PC's USB and power-button wiring and joins the store network over LAN. From outside you watch the screen, type and move the mouse, and if the PC hangs you press its power button remotely. Nothing is installed on the PC, so any operating system works.

Signal flow

Phone or laptop outside→Relay box→Store PC

Screen

HDMI capture, 1080p

Input

Acts as a USB keyboard and mouse

Power

Power-button relay + power LED sensing

Link

100M Ethernet

Security

Physical lock switch blocks input

Install

Nothing to install on the PC

※ Same board as the POS Remote Bridge. The only difference is HDMI capture instead of a camera.

HDMI-over-Network Transceiver

One HDMI in, two out. One of them over the network.

Takes an HDMI input, passes one copy straight to a monitor and sends the other over LAN to another location. Pick send or receive with a switch, match the IP, and the two units pair up to show the same picture in real time. Watch the counter screen from the office as it happens.

Signal flow

HDMI source→Sender→LAN→Receiver screen

Input

HDMI 1080p

Output

1 HDMI pass-through + 1 network

Mode

Switch selects send or receive

Pairing

1:1 by IP address

Latency

Under 0.3 s

Network

100M Ethernet

※ Sender and receiver are the same unit. Only the switch position differs.

After-Hours Sign & Lighting Cutoff

The sign switches itself off at closing time

A switch box wired into the sign and display lighting. It follows the opening-hours schedule, and holidays or one-off closures are changed for that day only in the phone app. When the store hub sends the closing signal it switches off on the spot, and if the network drops the built-in clock still keeps the schedule.

Signal flow

Schedule · phone app→Switch box→Sign · lighting

Load

220 V 16 A, 2 circuits

Schedule

Per weekday, holiday exceptions

Manual

Instant on/off from the phone app

Clock

Built-in RTC, works with the network down

Status

Per-circuit on indicator

Safety

Returns to the scheduled state after an outage

Self-Charging E-Ink Window Sign

No power cord. Inside the glass, facing out.

Mounted inside the store window with both the display and the solar cell facing outward. Send a notice from the phone app and the e-ink screen changes; after that it draws almost nothing, so sunlight alone keeps it charged. Schedule opening hours, holidays and promotions by time slot and the sign changes on its own.

Signal flow

Phone app→Store hub→E-ink sign

Display

10×5 cm 3-color e-ink

Power

Solar cell + LiFePO4, self-charging

Refresh

Checks for new text every 5 min

Standby

A few µA, zero power to hold the image

Schedule

Text rotation by time slot

Mounting

Inside the window, display and cell facing out

※ Uses the same hub signal as the wireless notice display. One hub drives several signs.

Tiled E-Ink Promo Display

Put tiles together and they become one screen

Join as many 20×10 cm e-ink modules as you need. The joined modules split text and images between them and behave like one large screen. Set the layout in the phone app, send, done. Each module receives only its own slice.

Signal flow

Phone app→Store hub→N tiles

Module

20×10 cm 3-color e-ink

Layout

Any grid, rows and columns

Sync

Wired bus between modules, simultaneous refresh

Power

One adapter, daisy-chained

Content

Text, images, QR codes

Retention

Image stays even with power off

※ Made to be seen from outside, so wired power is the default rather than solar. Managed from the same app as the window sign.

Staff Call Button

One button, a year on a battery

A wireless button for tables, storerooms and restrooms. Press it and the store hub rings the chime and tells the staff phone where it was pressed. Runs over a year on one battery and warns before the battery gets low.

Signal flow

Call button→Store hub→Chime · phone alert

Wireless

Long-range Bluetooth

Power

One CR123A, over a year

Standby

Deep sleep, a few µA

Alert

Chime + phone push with location name

Battery

Low-battery warning in advance

Count

Many buttons per hub

※ If the Delivery-Alert Chime Hub is installed, it receives the buttons. No extra hub needed.

Bluetooth Beacon Access & Location

Who came in and when, with one tag

When a staff or contractor tag enters a gateway's range, the entry time is recorded. With several zones such as a warehouse and a workshop, you also see which zone each person is in. Entry records and working hours are on the admin web right away.

Signal flow

Bluetooth tag→Gateway→Admin web

Tag

Bluetooth beacon, 1-year battery

Gateway

One per zone, Wi-Fi backhaul

Records

Entry and exit times, dwell time

Screen

Admin web: access log, working hours

Scaling

Add a zone by adding a gateway

Privacy

Only the tag number is stored

Freezer Power-Loss & Restore Alert

Outage at once, restore at once

Plugged in line with the freezer, it alerts the moment power is lost and again when it returns. It also logs how far the inside temperature rose during the outage, which makes the discard decision easy. It has its own battery, so alerts go out even during the outage.

Signal flow

Outlet→Detector→Phone alert

Sensing

Mains present + inside temperature

Alert

Instant push on loss and restore

Log

Outage duration, peak temperature

Power

Mains + built-in battery, 12 h during outage

Wireless

Wi-Fi or hub Bluetooth

Install

Plugs in between outlet and freezer

※ Same sensor node as the temperature logger. If you have the logger, only outage sensing is added.

Shelf Weight Sensor

When the shelf gets light, you get an out-of-stock alert

A thin weight-sensing plate goes under the shelf. When items are taken and the weight drops below the threshold, an out-of-stock alert reaches the phone. It also records when fast movers run out, by time of day, which makes ordering timing easy.

Signal flow

Shelf sensor→Store hub→Phone alert

Sensor

Load-cell plate, up to 20 kg

Reference

Learns the weight of one item

Alert

N items or fewer remaining

Log

Depletion graph by time of day

Power

Battery, 1 year

Wireless

Bluetooth to the hub

Wireless Remote Metering

Meter readings without walking to the meter

A wireless node counts the pulse output of electricity, water and gas meters and sends it to the hub. Usage from several stores and floors collects on the server and shows by day and month. The node runs on a battery, so no outlet is needed at the meter.

Signal flow

Meter pulses→Wireless node→Hub→Usage web

Input

2 pulse contact channels

Wireless

Long-range Bluetooth, LoRa option

Power

Battery, 2 years

Reports

Daily and monthly usage, store comparison

Alert

On unusual spikes

Install

Mounted next to the meter

Production Programmer

Flash and configure in one click

One USB cable flashes MCU firmware and writes configuration values in a single pass. A lock gate admits only approved files, a genuine-match LED confirms the part, and file-name colors tell products apart. For the line operator it is one click.

Signal flow

One USB cable→Production programmer→Product board

Connection

1 USB (power · flash · input)

Flashing

MCU firmware + config values together

Lock gate

Approved files only

Indicators

Genuine-match LED · file-name color

Operator

One click

Targets

STM32 family · extensible

※ Built so the device blocks the mistakes that happen on a line: wrong file, missing configuration.

Legacy Equipment Input Bridge

Connect old equipment to today's PCs

Send and receive keyboard and serial input for legacy equipment from a modern PC or phone. No modification to the equipment; it plugs into the existing port.

Signal flow

Legacy equipment→Input bridge→Modern PC · phone

Inputs

PS/2 · serial · USB keyboard

Outputs

USB · wireless

Modification

None · plugs into the port

Direction

Bidirectional (send and receive)

Power

Equipment port or USB

Use

Legacy CNC · instruments · terminals

※ The 'hands' portion of the POS Remote Bridge, on its own.

Multi-Target Programming Hub

One board programs several targets at once

Programs several boards at a time on the production line. One hub carries several target connectors, and one PC sees each target as its own independent programmer. If one board fails the rest keep going, and results show on per-channel LEDs.

Signal flow

Production PC→Multi hub→N target boards

Channels

4 independent targets

Interface

SWD + UART log

PC view

A separate programmer per channel

Target power

Per-channel switch

Indication

Per-channel pass/fail LED

Cable

Standard 10-pin connector

※ Same family as the Production Programmer. Switch to this hub when volume grows.