MATTEH tehnologije
MATTEH tehnologije
🏆 IFIA Best Invention Medal • Grand Prix • iENA Gold • Tesla – Genius for the Future

We build products that work in the real world

Energy Harvesting Mechatronics Embedded Full-stack

From sensors to generators, from PCB to mechanics

We build devices that survive the field: sea, cold, vibrations, weak signal — and deliver measurable results. Hardware + Firmware + Cloud, all under one roof.

Request PoC Analysis Projects & Technologies
🏆 20+ international awards
3 hardware startups
wave energy → prototype
What We Do

From concept to functional product

Energy Harvesting

waves, solar, TEG

Mechatronics

mechanics + electronics

Embedded

PCB, firmware, ultra-low-power

Full-stack

cloud, API, dashboard

3

hardware startups

20+

international awards

10+

years battery life

Energy Harvesting Wave Power Solar MPPT TEG Mehatronika nRF9160 ESP32 STM32 LTE-M NB-IoT GPS/GNSS Altium KiCAD Zephyr RTOS REST API Full-stack Energy Harvesting Wave Power Solar MPPT TEG Mehatronika nRF9160 ESP32 STM32 LTE-M NB-IoT GPS/GNSS Altium KiCAD Zephyr RTOS REST API Full-stack
Service Packages

What You Get

Choose the service level according to your project needs. Each package includes documentation and technical support.

Hardware Development

PCB design + prototype

PCB design, RF impedance matching, antenna tuning, prototype manufacturing.

Deliverables:
  • Multi-layer PCB design (up to 8 layers)
  • RF impedance matching + antenna tuning
  • Functional prototype (3-5 pcs) + BOM/Gerber
  • Test report + power profiling
Includes:
RF impedance Antenna tuning Ultra-low-power

Firmware Development

embedded software

Firmware development for your existing or new hardware.

Deliverables:
  • Production firmware + source
  • OTA update infrastructure
  • Power profiling report
  • Technical documentation
Includes:
Zephyr/FreeRTOS State machines Sleep optimization
Most Popular

Complete IoT Solution

HW + FW + full-stack

Complete solution: hardware, firmware, server, database, API, backend, frontend.

Deliverables:
  • Hardware + Firmware (all above)
  • Server + database + REST API + backend
  • Frontend dashboard + responsive web
  • Alert system + notifications + analytics
Includes:
LTE-M/NB-IoT GPS/GNSS Real-time

Not sure which package you need?

Request free consultation
Case Studies

Completed Projects

End-to-end IoT systems with measurable results

🏆 Award-winning Case Study

BeeSmart — Smart Beehive Scale

Award-winning IoT platform for remote beehive monitoring. Precise weight measurement and tracking of temperature and humidity (inside hive and environment), GPS location and tilt/theft detection. Communication via SMS, Android app and web app — beekeepers see everything without going to the field.

Problem

Migratory apiaries hundreds of km away; manual checks waste time and increase theft risk

Solution

Autonomous IoT scale with solar power, real-time alerts and multi-channel access (SMS/app/web)

Result

Time savings, increased yield, apiary security, 5+ international awards

<10 g
Resolution
200 kg
Capacity
10
Battery life
GPS
+ alarm
NB-IoT LTE-M Load cells Temp/humidity sensors GPS + alarm Android app
Occupational Safety Case Study

HAV Glove — Vibration Measurement

Control and monitoring system for hand-arm vibration (HAV) measurement and daily exposure A(8) calculation. Device in glove collects data during equipment operation and sends it to mobile device. Mobile app shows three states (OK / WARNING / STOP WORK) with alarm. Data goes to web server database; expert can perform analysis, reports and send alarms.

Problem

Excessive vibration exposure causes permanent injuries; no real-time monitoring

Solution

End-to-end system: sensor in glove → mobile → cloud → web dashboard + alarms

Result

Regulatory compliance, injury prevention, automatic inspection reports

Full-stack Architecture
Glove → BLE → Mob app → API → Web
MEMS accelerometer BLE Android app REST API Web dashboard
R&D

Research & Development

In-house projects and experimental platforms in various development stages

Unlimited Autonomy

Solar + TEG Pet GPS Tracker

Ultra-lightweight GPS tracker (<10 g) for cats and small dogs, designed to never need charging. Uses WiFi positioning and ultra-low-power modes most of the time; GPS only on-demand. Average consumption ~30 µA enables indefinite runtime with small solar panel. TEG (thermoelectric generator) provides additional insurance for edge cases (darkness, winter, fur).

Weight: <10 g
Avg consumption: ~30 µA
Autonomy: ∞
Solar TEG WiFi positioning On-demand GPS IP67
Technical Study Patent Pending

Stratospheric BWB HAPS (24/7)

Feasibility study for ultra-small pseudo-satellite (15-30 km altitude) in BWB configuration. Optimal scenario: mass ~1.13 kg, wingspan ~1.54 m, cruise power ~10 W, battery 230 g. Key is "glide cycle" (30→15 km) saving 25-40% battery mass and enabling unlimited autonomy (24/7).

Mass: ~1.13 kg
Wingspan: ~1.54 m
Autonomy: 24/7
BWB Solar Glide strategy Stratosphere
Concept Patent Pending

Solar Drone 3m (24-48h)

Concept of "pseudo-satellite" in smaller class with perovskite solar cells and satellite communication. Realistic limitation: night (10-12h without sun) defines maximum autonomy of 24-48h. Still, that's already 10-20× more than conventional drones (1-4h).

Wingspan: 3 m
Autonomy: 24–48 h
Limit: night
Perovskite solar MPPT Satcom
PoC

Wave Energy / Breakwater

Mechanical concept of wave energy conversion to useful electrical energy. Focus on generator load optimization (maximum stroke with required force). Project includes real conditions measurement and mechanics iteration (transmission, weight, generator, losses).

Energy harvesting Marine Mehanika

Have a project idea? Let's talk.

Request PoC Analysis
Advantages

We don't sell PowerPoint.
We deliver working products.

Test plan with measurable KPIs
Exit criteria
Field telemetry
PoC report with numbers

Fast Iteration

weeks, not months

Prototype in 4-6 weeks. Test data in 8-12. Iterations based on measurements.

Vertical Integration

HW + FW + full-stack

One developer sees the full stack - from PCB to frontend.

Field Validation

lab != real world

We test at -20°C, in sun, in dust, with poor GSM signal.

EU Grant Experience

TRL methodology

Documentation for PoC/Horizon applications, patent strategy.

About Us

We only work on projects
where where reliability is critical

We don't do "feasibility studies" that end up in a drawer. We build functional prototypes with telemetry and test them in real conditions. Result: measurable data on which you can base investment decisions.

Matija Hržić, Electrical Engineer

Founder

  • Specialization: automation, process computing, embedded
  • Experience: 3 hardware startups (from zero to product)
  • Awards: 20+ international awards for BeeSmart (IFIA, iENA, ARCA...)
  • Public service: Vice President of City Council, city councilor of Samobor

Ideal for:

  • ✓ Ultra-low-power devices (10+ years battery)
  • ✓ IoT sensors, telemetry, energy harvesting
  • ✓ PoC and prototype development (TRL 3-7)

Not for:

  • ✗ Documentation only without prototype
  • ✗ Documentation only without prototype
  • ✗ Technologies that can't be tested
1

PoC / Proof of Concept

TRL 3-4 | 8-12 weeks

Define hypothesis, build minimal system, real conditions measurement, report.

2

Prototype Development

TRL 4-6 | 12-24 weeks

Functional prototype with telemetry, pilot test with real users, iterations.

3

Pre-production

TRL 6-7 | as needed

DFM/DFT, supplier sourcing, cost optimization, certification documentation.

Capabilities

Technical Stack

Everything needed for end-to-end IoT development — hardware, firmware, cloud and telemetry

Embedded Hardware & PCB

  • Ultra-low-power design (<50 µA sleep)
  • Multi-layer PCB (4-8 layer, RF matching)
  • Power management (solar MPPT, buck/boost)
  • Sensor integration (MEMS, acoustic)
  • Antenna design & RF optimization

Wireless & Communication

  • GPS/GNSS (ultra-low-power, A-GPS)
  • Cellular: LTE-M, NB-IoT (nRF9160/9151)
  • BLE 5.x (mesh, advertising)
  • LoRa/LoRaWAN (long-range IoT)

Firmware & Embedded SW

  • RTOS & bare-metal (FreeRTOS, Zephyr)
  • State machine architecture
  • Power optimization strategies
  • Bootloader & OTA updates
  • Remote diagnostics & telemetry

IoT Stack & Backend

  • HTTP/JSON APIs, MQTT, WebSockets
  • Cloud storage & analytics
  • Real-time dashboards (web/mobile)
  • Alert systems & notifications

Energy Harvesting

  • Solar MPPT dizajn i optimizacija
  • Thermoelectric generators (TEG)
  • Wave energy (generator design)
  • Power budget & winter operation

Integration & Testing

  • Test plan development (KPIs)
  • Field testing (temp, dust, signal)
  • HIL/bench testing
  • EU grant documentation (TRL)

Mechatronics & Physics

  • Drones & aircraft (solar, HAPS)
  • Physics calculations & simulations
  • Mechanical design & CAD
  • Actuator control & motor drives

Development Tools

PCB: Altium, KiCAD
Mfg: JLCPCB, AISLER
SDK: nRF Connect SDK, ESP-IDF
Sim: LTspice, thermal
VCS: Git, CI/CD
Digital

Digital & Communications

Besides hardware, we also develop web solutions: websites, landing pages, content and automation. We understand communication and performance aspects — SEO, speed, structure, analytics.

🇪🇺

Web project — Member of European Parliament

Web development and maintenance for MEP Davor Ivo Stier. Custom development + maintenance + SEO.

stier.hr →
Frontend Backend SEO Analytics

Web Development

HTML/CSS/JS, PHP, React

Backend

REST API, databases, PHP

Mobile Apps

React Native (Android/iOS)

Analytics

GA4, Search Console, performance

Communications

Content, campaigns, EU/politics

Award-winning

Awards & Recognition

IFIA Best Invention Medal • Grand Prix ARCA • iENA Gold • 20+ international awards

IFIA Best Invention Medal

Smart Beehive Scale — BEE SMART

IFIA World Invention & Innovation Forum, 2020

Grand Prix — Agro ARCA

Best fair innovation

ARCA Zagreb, 2021

Gold Medal — iENA

BEE SMART

iENA Nürnberg, 2021

Tesla — Genius for the Future

Annual innovation award

Tesla&friends, 2021

Gold + Innovator Cup

Smart Beehive Scale

Sajam inovacija Beograd, 2021

Grand Prix + Gold

Smart Beehive Scale

ARCA Zagreb, 2020

"Rudolf Perešin" Award

Annual innovation award

ZTK Zagrebačke županije

3rd place

First Regional Virtual Inventions Fair, 2020

+12

And other awards from INOVA, ARCA and international innovation fairs

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Contact

Let's Start a Project

Send inquiry and get PoC plan in 48 hours

Location

Croatia (EU)

Expected response:

  • PoC plan: 48h
  • Prototype scope: 1 week
  • Production quote: 1-2 weeks