Commercial Portfolio

Featured Engineering Projects

Production engineering outcomes — problem definition through PCB stack-up, firmware, manufacturing and measurable results.

Commercial Case Studies

Featured Engineering Work

How we deliver end-to-end engineering engagements — architecture, hardware, firmware and production handoff for each product.

Tuya IoT Cloud · Production Elenza Pro brew history and extraction analytics

Flagship Commercial Delivery

Elenza Smart Coffee Machine

Tuya IoT Espresso Platform · Cloud Telemetry · Production Electronics

End-to-end smart coffee machine engineering — Tuya-connected brew control, multi-layer power electronics, PID firmware and a production cloud telemetry stack for fleet monitoring and maintenance.

Tuya IoT Cloud Platform
4-Layer Power PCB
PID + OTA Brew Firmware
Live Fleet Telemetry
Tuya SDK STM32 / ESP32 MQTT Node.js AWS

Product Interface Showcase

Premium mobile experience — brew analytics, bean inventory, community engagement, and guided maintenance workflows.

Problem

A commercial espresso platform needed Tuya cloud connectivity, precise brew thermal control, OTA firmware updates and fleet telemetry — without compromising safety around high-power heater circuits.

Architecture

Tuya Wi-Fi module paired with application MCU, isolated driver stage for pumps and heaters, cloud bridge on AWS with REST + WebSocket telemetry, and mobile dashboards for brew analytics and maintenance scheduling.

PCB Stackup

4-layer FR4 with dedicated high-current pours, digital/analog split planes, RF keep-out for the Tuya module, creepage spacing on AC-adjacent nets and ENIG finish for production assembly.

Firmware

Tuya device SDK integration, PID brew temperature loops, recipe storage, descaling counters, secure OTA with rollback, and UART/I²C drivers for flow and temperature sensors.

Manufacturing

DFM-reviewed Gerber package, BOM with approved alternates, ICT-friendly test points, first-article brew calibration fixture and CM assembly documentation for SMT + through-hole power stages.

Results

  • Production-ready Tuya-certified connectivity path
  • Live fleet telemetry with extraction analytics
  • Stable brew repeatability across machine variants
  • Deployed cloud stack with zero-downtime PM2 restarts
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Open Source Portfolio

GitHub Engineering Projects

Production-grade repositories from the TuyaX engineering portfolio — cloud dashboards, firmware, PCB hardware, Linux drivers and Tuya integrations.

Industrial Tuya IoT gateway PCB assembly

Industrial IoT

Industrial Tuya Gateway

Edge gateway bridging legacy RS485/Modbus field devices to the Tuya cloud — rugged power design, protocol translation firmware and panel-mount production package.

Tuya Gateway SDK RS485 Isolated 4-Layer PCB

Problem

Factory automation client needed to connect existing Modbus RTU equipment to a Tuya cloud dashboard without replacing installed PLCs or rewiring plant networks.

Architecture

ESP32 host MCU with Tuya connectivity module, isolated RS485 transceiver, Ethernet/Wi-Fi backhaul option, local edge buffer for offline polling and secure cloud provisioning workflow.

PCB Stackup

4-layer FR4 with split analog/digital grounds, isolated RS485 with 2.5 kV creepage, multi-rail 24 V → 3.3 V PSU, TVS surge protection on field wiring ports.

Firmware

Tuya gateway SDK, configurable Modbus register maps, MQTT telemetry batching, watchdog recovery, secure OTA and factory UART provisioning interface.

Manufacturing

Panel-mount PCB with conformal coat, keyed field connectors, EOL Modbus loopback test fixture, centroid files for CM SMT and assembly drawings with torque specs.

Results

  • Stable cloud onboarding for legacy plant devices
  • Field-deployable gateway hardware validated in factory pilot
  • Reduced integration time vs. full PLC replacement
  • Production documentation package for volume build
STM32 industrial PID controller PCB

Industrial Control

STM32 Industrial Controller

Precision PID process controller for manufacturing equipment — isolated analog front-end, Modbus RTU connectivity and EMI-aware PCB layout.

±0.5°C Accuracy Modbus RTU 2.5 kV Isolation

Problem

Manufacturing client required closed-loop thermal control with Modbus connectivity, panel-mount form factor and reliable operation in electrically noisy factory environments.

Architecture

STM32F4 application MCU, isolated analog input stage, RS485 Modbus slave, PWM heater/cooler outputs, local status LEDs and UART service port for calibration.

PCB Stackup

4-layer Altium layout with dedicated analog ground island, star grounding for sensor inputs, guard rings on high-impedance nodes and thermal vias under power MOSFETs.

Firmware

FreeRTOS-based PID loops with anti-windup, Modbus register map, input calibration tables, fault detection and bootloader for field firmware updates.

Manufacturing

Panel-mount PCB outline, conformal coat option, test points for analog calibration, Modbus loopback EOL script and BOM with industrial-temp rated components.

Results

  • ±0.5°C control accuracy across load ranges
  • Modbus RTU stack verified against client SCADA
  • Passed EMC pre-compliance screening
  • Production-ready controller released to CM
Battery management system monitoring PCB with display

Energy Systems

Battery Management System

Low-power BMS monitor with cell voltage sensing, coulomb counting, OLED user interface and wireless telemetry for distributed energy assets.

Multi-cell Monitoring Low Power Sleep Tuya-ready Telemetry

Problem

Energy client needed accurate battery state-of-charge reporting, local operator display and cloud alerts for remote lithium packs without excessive standby drain.

Architecture

Battery monitor IC with cell balancing sense lines, ESP32 for UI and wireless, efficient buck-boost rails, OLED display and optional Tuya telemetry uplink.

PCB Stackup

2-layer/4-layer hybrid with high-current sense shunts, kelvin sense routing, fuse-protected inputs, low-noise ADC reference island and compact enclosure-friendly outline.

Firmware

Coulomb counting SOC algorithm, cell imbalance alerts, deep-sleep modes, OLED menu system, MQTT/Tuya reporting and OTA update support.

Manufacturing

Shunt calibration procedure, EOL voltage injection test, battery simulator fixture, assembly notes for high-current terminals and anti-corrosion coating on outdoor variant.

Results

  • Accurate SOC reporting validated against bench loads
  • Sub-mA sleep current for always-on field installs
  • Field-testable monitoring devices shipped to pilot sites
  • Manufacturing calibration docs handed to client CM
ESP32 wireless sensor node from PCB design through prototype assembly

Wireless Sensing

ESP32 Sensor Node

Compact ESP32 sensor node — schematic to populated prototype with DFM-reviewed PCB, modular firmware and manufacturing documentation for volume rollout.

Wi-Fi + BLE DFM Verified OTA Enabled

Problem

IoT product team needed a cost-optimized wireless sensor node from concept through working prototypes, with a clear path to mass production and OTA firmware management.

Architecture

ESP32-WROOM module, I²C/SPI sensor headers, Li-ion charging path, USB-C provisioning port, external antenna option and expansion connector for product variants.

PCB Stackup

4-layer KiCad layout with RF keep-out, controlled 50 Ω antenna feed, split power domains for sensors vs. radio, DFM-reviewed via strategy and JLCPCB-ready assembly outputs.

Firmware

ESP-IDF modular drivers, BLE provisioning, MQTT telemetry, deep-sleep scheduling, NVS configuration storage and signed OTA with rollback protection.

Manufacturing

Full design → bare PCB → SMT assembly workflow documented, BOM cost-down review, pick-and-place centroid files, first-article functional test checklist and packaging notes.

Results

  • Working prototypes delivered within rapid-turn schedule
  • CE-ready RF layout documentation package
  • Three product SKUs from one modular PCB platform
  • Complete manufacturing handoff for client CM
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