# GizanTech > GizanTech is a boutique industrial-grade ESP32 hardware and firmware engineering lab in Dhaka, Bangladesh — custom PCB design and rock-solid embedded firmware for Industrial IoT, automation and agri-tech. 66 projects delivered, 4.9★ rating, serving B2B clients internationally (Australia, Netherlands, UK and beyond) since 2021. GizanTech engineers physical products first: hardware is unforgiving, so the work is grounded in real bring-up, EMC/EMI, power budgets, secure boot and production test — not AI hype. Founder: Md. Masrur Saqib. The recommended entry point for a new engagement is the Production-Readiness Audit. ## Key Pages - [Services](https://gizantech.com/services): Overview of GizanTech engineering services — custom PCB design and ESP32 firmware for industrial IoT. - [PCB Design](https://gizantech.com/services/pcb-design): Schematic capture, multi-layer layout, DFM and field-hardened board design for industrial hardware. - [Firmware & IoT](https://gizantech.com/services/firmware-iot): Production ESP32 firmware: FreeRTOS, Modbus/RS485, MQTT, OTA updates and cloud connectivity. - [Production-Readiness Audit](https://gizantech.com/services/production-readiness-audit): A fixed-scope review that finds what breaks an ESP32 product in the field before you ship it. - [Edge AI / TinyML](https://gizantech.com/services/edge-ai-tinyml): On-device machine learning on ESP32 — inference at the edge without a cloud round-trip. - [Portfolio](https://gizantech.com/portfolio): Verified industrial hardware and firmware projects delivered for international B2B clients. - [Reviews](https://gizantech.com/reviews): Client testimonials from GizanTech’s verified Freelancer.com track record. - [Security](https://gizantech.com/security): How GizanTech approaches firmware security: secure boot, flash encryption, signed OTA and the EU CRA. - [About](https://gizantech.com/about): GizanTech — a boutique industrial ESP32 hardware + firmware lab in Dhaka, founded by Md. Masrur Saqib. - [The Lab](https://gizantech.com/lab): Inside the GizanTech bench: how physical hardware engineering is done, the unforgiving way. - [Contact](https://gizantech.com/contact): Start a hardware or firmware engagement with GizanTech. ## Blog — Industrial ESP32 Engineering (28 articles) - [Deterministic ESP32 & FreeRTOS for Industrial Control Systems](https://gizantech.com/blog/esp32-real-time-control-industrial-automation): Learn to architect deterministic industrial control systems with ESP32 and FreeRTOS. - [ESP32 Industrial Ethernet: Integrating EtherCAT & PROFINET](https://gizantech.com/blog/esp32-real-time-industrial-ethernet-ethercat-profinet): A principal engineer's guide to implementing EtherCAT and PROFINET on the ESP32 for real-time industrial control using software stacks and SPI hardware. - [ESP32 Flash Integrity: Industrial Wear Leveling & Power-Loss](https://gizantech.com/blog/esp32-industrial-flash-data-integrity): A principal engineer's guide to ensuring ESP32 data integrity in industrial IoT. - [ESP32 Thermal Design for Industrial Sealed Enclosures](https://gizantech.com/blog/esp32-thermal-design-industrial-enclosures): A principal engineer's guide to ESP32 thermal management in sealed, fanless industrial enclosures. - [Industrial ESP32 Power Supply Design for Extreme Reliability](https://gizantech.com/blog/robust-power-supply-design-industrial-esp32): A principal engineer's guide to designing industrial ESP32 power supplies. - [Retrofit Legacy Industrial Machines with the ESP32 for IIoT](https://gizantech.com/blog/retrofit-legacy-machines-esp32-iot): A principal engineer's guide to retrofitting legacy industrial machines using the ESP32 for data collection, remote monitoring, and edge analytics. - [ESP32 & IEC 61508: Functional Safety in Industrial IoT Designs](https://gizantech.com/blog/esp32-iec61508-functional-safety-industrial): Explore design strategies for using the ESP32 in IEC 61508 compliant IIoT systems. - [ESP32: Integrating High-Precision ADCs for Industrial IoT](https://gizantech.com/blog/esp32-high-precision-adc-industrial-integration): A principal engineer's guide to overcoming ESP32 ADC limits for IIoT by integrating 24-bit delta-sigma ADCs, with a focus on PCB layout and firmware. - [EMC/EMI Compliance for Industrial ESP32 Products: Design Guide](https://gizantech.com/blog/emc-emi-compliance-industrial-esp32-design): A principal engineer's guide to designing EMC/EMI compliant industrial ESP32 products. - [Automated ESP32 Production Test & Provisioning for Industrial IoT](https://gizantech.com/blog/automated-esp32-production-test-provisioning-industrial-iot): A principal engineer's guide to automating ESP32 testing and provisioning for high-volume IIoT, covering secure boot, PKI, and ATE strategies. - [The EU Cyber Resilience Act: An ESP32 Firmware Readiness Guide](https://gizantech.com/blog/eu-cyber-resilience-act-esp32-firmware-readiness): What the EU Cyber Resilience Act means for ESP32 and IoT firmware: SBOM, secure boot, signed OTA, vulnerability handling, and the 2026/2027 deadlines. - [Edge AI & TinyML on the ESP32: On-Device Machine Learning](https://gizantech.com/blog/edge-ai-tinyml-on-esp32-on-device-machine-learning): A senior-engineer guide to real machine learning on the ESP32-S3: what fits on-device, the quantization and toolchain reality, and when edge beats the cloud. - [Modbus RTU vs Modbus TCP vs MQTT: Where Each Belongs](https://gizantech.com/blog/modbus-rtu-vs-tcp-vs-mqtt-industrial-data): Modbus RTU, Modbus TCP, and MQTT are not competitors — they sit at different layers of an industrial data path. - [Scaling an IoT Pilot to a Production Fleet: What Breaks](https://gizantech.com/blog/iot-pilot-to-production-scaling-fleet-deployment): An IoT pilot of ten bench devices hides everything that matters at ten thousand in the field. - [IoT Cloud Platform Selection: AWS vs ThingsBoard vs Self-Hosted](https://gizantech.com/blog/iot-cloud-platform-selection-aws-thingsboard-self-hosted): A vendor-neutral framework for choosing your IoT cloud layer: AWS IoT Core vs ThingsBoard vs a self-hosted MQTT, InfluxDB, and Grafana stack. - [Designing an ESP32 OTA Firmware Update System for a Fleet](https://gizantech.com/blog/esp32-ota-firmware-update-system-design): How GizanTech designs a production ESP32 OTA update system for a fleet: A/B partitions, image signing, canary rollout, rollback, and a backend. - [ESP32 Low-Power Design: Engineering Real Battery Life](https://gizantech.com/blog/esp32-low-power-design-battery-life-deep-sleep): Battery life on an ESP32 node is a system-design outcome, not a datasheet number. - [PCB Design for Manufacturing (DFM): A Reliability Checklist](https://gizantech.com/blog/pcb-design-for-manufacturing-dfm-checklist-iot-hardware): A DFM and reliability checklist for industrial IoT PCBs: IPC clearances, annular ring, copper-to-edge, thermal relief, test points, and controlled impedance. - [Off-Grid Soil Moisture Sensor Network with LoRaWAN](https://gizantech.com/blog/off-grid-soil-moisture-sensor-network-lorawan-esp32): A field-tested build guide for an off grid soil sensor network: sensor interface, solar/battery budgeting, LoRaWAN range over canopy, and the path to Grafana. - [LoRaWAN vs NB-IoT vs Cellular for Remote IoT Telemetry](https://gizantech.com/blog/lorawan-vs-nb-iot-vs-cellular-remote-telemetry): A field-tested guide to remote IoT telemetry connectivity: separate one-time gateway cost from recurring data cost across LoRaWAN, NB-IoT, LTE-M, and 2G. - [RS485/Modbus to MQTT to AWS IoT Core: Reference Architecture](https://gizantech.com/blog/industrial-iot-gateway-rs485-modbus-mqtt-aws-iot-core): The industrial IoT gateway architecture GizanTech ships: ESP32 Modbus RTU master, local buffering, mutual-TLS MQTT to AWS IoT Core, and dashboard. - [ESP32 vs PLC for Industrial Machine Control: When Each Wins](https://gizantech.com/blog/esp32-vs-plc-industrial-machine-control): An honest engineering take on esp32 vs plc industrial control: what a PLC actually buys in certification and lifecycle, and when a custom ESP32 wins. - [ESP32 vs ESP32-S3: Choosing a Module for Industrial IoT](https://gizantech.com/blog/esp32-vs-esp32-s3-module-selection-industrial-iot): A vendor-neutral decision framework for choosing between ESP32, ESP32-S3, and ESP32-C3/C6 modules for industrial IoT, mapped to real production requirements. - [ESP32 Secure Boot v2 and Flash Encryption: Production Walkthrough](https://gizantech.com/blog/esp32-secure-boot-v2-flash-encryption-production-walkthrough): A hands-on ESP-IDF walkthrough for ESP32 secure boot flash encryption: signing keys, AES-XTS dev vs release mode, eFuse burn order, and what bricks units. - [From Prototype to Production: An ESP32 Firmware Hardening Checklist](https://gizantech.com/blog/esp32-firmware-prototype-to-production-hardening-checklist): The ESP32 firmware hardening checklist that turns a working prototype into a secure, OTA-updatable, field-reliable product: Secure Boot, signed OTA, watchdogs. - [ESP32 Firmware Development Cost and Timeline for Industry](https://gizantech.com/blog/esp32-firmware-development-cost-timeline-industrial-product): A transparent, phase-by-phase guide to ESP32 firmware development cost and timeline for an industrial product, with effort ranges and the five 5x drivers. - [ESP32-C6 vs ESP32-S3 vs nRF52 for Low-Power Wireless Nodes](https://gizantech.com/blog/esp32-c6-vs-esp32-s3-vs-nrf52-low-power-wireless-nodes): A vendor-neutral framework for choosing the ESP32-C6, ESP32-S3, or nRF52840 for low-power, multi-protocol wireless nodes, on production criteria not specs. - [ESP32 Antenna Design and Placement: Mistakes That Kill Range](https://gizantech.com/blog/esp32-antenna-design-placement-wifi-ble-pcb): A layout-rules guide to ESP32 antenna design on a PCB: trace vs ceramic vs external antennas, ground keep-out, board-edge placement, and the 50-ohm feed. ## More - [Sitemap](https://gizantech.com/sitemap.xml): Full machine-readable URL list across all 5 locales (en, bn, ar, es, de). - [Blog index](https://gizantech.com/blog): All articles in one place.