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কেস স্টাডি

হার্ডওয়্যার পোর্টফোলিও

আমাদের টিম দ্বারা এন্ড-টু-এন্ড ইঞ্জিনিয়ারড বাস্তব ইন্ডাস্ট্রিয়াল প্রকল্প।

কাস্টম ESP32 কন্ট্রোল বোর্ডের সাথে সংযুক্ত হেভি-ডিউটি ইন্ডাস্ট্রিয়াল ব্রাশলেস মোটর

ইন্ডাস্ট্রিয়াল মোটর টর্ক কন্ট্রোলার

চ্যালেঞ্জ

একজন UK ক্লায়েন্টের RS485 এর মাধ্যমে ইন্ডাস্ট্রিয়াল ব্রাশলেস মোটরের জন্য সুনির্দিষ্ট টর্ক কন্ট্রোল এবং রিয়েল-টাইম ফল্ট ডিটেকশন প্রয়োজন ছিল।

সমাধান

গিজানটেক একটি ESP32 ফার্মওয়্যার সমাধান ইঞ্জিনিয়ার করেছে যাতে কাস্টম ইউজার ইন্টারফেস, রিয়েল-টাইম ফিডব্যাক লুপ এবং শক্তিশালী Modbus সিরিয়াল কমিউনিকেশন রয়েছে।

ESP32RS485ModbusReal-Time ControlAltium
গাঢ় পানিতে ভাসমান ওয়াটারপ্রুফ রাগেড ইন্ডাস্ট্রিয়াল সেন্সর এনক্লোজার

রিমোট ওয়াটার কোয়ালিটি টেলিমেট্রি নোড

চ্যালেঞ্জ

প্রতি ১৫ মিনিটে ক্লাউড সিঙ্কিং সহ pH, তাপমাত্রা এবং ঘোলাটে পদার্থের রিমোট মনিটরিং, সম্পূর্ণ অফ-গ্রিড।

সমাধান

ESP32 এর সাথে GSM/GPRS মডিউল ইন্টিগ্রেট করা একটি কাস্টম PCB, ব্যাটারি লাইফ সংরক্ষণে এক্সট্রিম লো-পাওয়ার স্লিপ মোডের জন্য অপ্টিমাইজড, নিরাপদে ক্লাউড ডাটাবেসে ডেটা পুশ করে।

ESP32GSM/GPRSLow-PowerCustom PCBCloud
কৃষি জমিতে এমবেড করা হাই-টেক মেটালিক সয়েল সেন্সর LoRaWAN গেটওয়ের সাথে সংযুক্ত

কৃষি-প্রযুক্তি সয়েল নেটওয়ার্ক

চ্যালেঞ্জ

একাধিক সেন্সর জুড়ে জটিল VWC এবং bulkEC ডেটা পড়া এবং Wi-Fi ছাড়াই দীর্ঘ দূরত্বে ট্রান্সমিট করা।

সমাধান

একটি ESP32 + LoRaWAN গেটওয়ে আর্কিটেকচার যা RS485/TTL ডেটা পড়ে, স্থানীয়ভাবে poreEC গণনা করে এবং InfluxDB/Grafana ড্যাশবোর্ডে ট্রান্সমিট করে।

ESP32LoRaWANRS485InfluxDBGrafana

Case studies

How we approach real builds

Environmental Monitoring

Solar-Floating ESP32 Water Quality Monitoring Prototype

Challenge
An environmental monitoring client needed a floating, autonomous device to track water quality at a remote site where wired connectivity and frequent site visits were not feasible. The unit had to capture multiple water parameters and reliably relay them to a cloud database on a fixed schedule without an on-site operator.
Approach
We built the prototype around an ESP32 paired with pH, temperature, and turbidity sensors, with a custom PCB layout to integrate the sensing front-end and power management for a floating enclosure. A GSM/GPRS module provided cellular backhaul so the device could operate fully off-grid. The firmware sampled the sensor suite and pushed readings to a cloud database on a recurring interval, balancing duty-cycling against power constraints for unattended operation.
Outcome
The client received a working remote water-quality prototype and left a 5-star review describing GizanTech as a great company to work with.
ESP32PCB LayoutWater QualityGSM/GPRSIoTEnvironmental Sensing
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Industrial IoT / Telecommunications

Cellular IoT Telemetry to AWS IoT Core over MQTT

Challenge
A client needed an embedded system to push field data to AWS IoT Core over a cellular link, with no reliable Wi-Fi or wired network at the deployment site. The connection had to be authenticated and secure end-to-end using device certificates rather than a shared credential.
Approach
We developed the system on the Arduino platform, driving a SIMCOM-class cellular module via the TinyGSM library and raw AT commands to bring up the GPRS data session. From there the device established an MQTT connection to AWS IoT Core, authenticating with per-device X.509 certificates so each unit was independently identified and trusted. The work spanned telecommunications and embedded engineering, covering the modem bring-up, the TLS/MQTT handshake, and the certificate provisioning needed for a production-style IoT data path.
Outcome
The IoT project was delivered to the client's satisfaction, earning a 5-star review that praised our patience and clear video and documentation support during their own testing.
AWS IoT CoreMQTTSIMCOMCellular GPRSTinyGSMEmbedded Systems
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Embedded AI / Computer Vision

ESP32-CAM Real-Time People Detection Proof of Concept

Challenge
A client wanted to prove that a low-cost ESP32-CAM dev board could perform real-time people detection at high accuracy, plus a companion mobile app to configure settings and receive detections. Running reliable object detection on such a constrained embedded platform, rather than offloading to a server, made this a deliberately difficult proof of concept.
Approach
We worked from a standard ESP-CAM dev board and built an object detection pipeline targeting real-time person detection on the embedded vision hardware. The implementation combined embedded C/C++ on the device with Python tooling for the detection workflow, and a companion iOS/Android app to adjust settings and surface detection events. Because the goal was a proof of concept rather than a polished product, effort focused on validating the detection approach and squeezing performance from the camera board.
Outcome
We delivered a working proof of concept against demanding specs; the client's 5-star review highlighted the extra time invested and an out-of-the-box approach to a highly complex problem.
ESP32-CAMObject DetectionEmbedded AIComputer VisionPythonMobile App
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Motion Control / Industrial Automation

ESP32 Brushless Motor Torque Control over RS485

Challenge
A repeat-engagement client needed firmware to drive a brushless motor through an RS485 controller from an ESP32, with precise torque regulation and operator-facing controls. The system also had to handle real-time feedback and fault conditions safely during operation.
Approach
We wrote an ESP32 code sketch that interfaced with the brushless motor controller over an RS485 serial link, implementing torque-control logic as the core function. The firmware handled bidirectional serial communication with the controller, processed real-time feedback from the motor, and exposed a user interface for operation. Fault detection was built in to flag and respond to abnormal conditions, rounding out a robust motion-control package in C/C++ on the ESP32.
Outcome
The client praised the spectacular results and explicitly looked forward to many future projects, leaving a 5-star review.
ESP32Brushless MotorTorque ControlRS485Motion ControlEmbedded C++
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Selected work

66 projects · 4.9★ since 2021

A selection from our verified Freelancer track record, by domain.

Firmware & IoT

Raspberry Pi Pico I2C Device Controller

Wrote Pico C firmware to drive multiple sensors and actuators over I2C, refined the schematic, and delivered a Raspberry Pi 5 companion application to test I2C and BLE communication.

Freelancer

Industrial Automation

Arduino Nextion Motor Control with Load-Cell Display

Built an Arduino Uno program driving a DC motor and rendering live load-cell (HX711) and draw-wire linear encoder readings on a Nextion touchscreen display.

Freelancer

ESP32 Brushless Motor Torque Controller

Created an ESP32 firmware sketch that interfaces with a brushless motor through an RS485 controller, providing torque control, real-time feedback, a user interface, and fault detection.

Freelancer

Multi-Relay Arduino Controller with Dealer Mode

Engineered Arduino Uno firmware controlling eight-plus relays with adjustable parameters, scheduling, run-duration logic, a dealer configuration mode, and an LCD user interface.

Freelancer

Reciprocating Pump Control Firmware

Developed well-structured Arduino and ATmega/STM microcontroller firmware to control a reciprocating pump system for an industrial pump application.

Freelancer

Dual NEMA 17 Motion Sequencer on ESP8266

Programmed an ESP8266 to drive two NEMA 17 motors through A4988 drivers, executing a configurable list of 50 process steps defining per-motor speed and direction.

Freelancer

LoRa-Based OEE Production Monitoring System

Built an OEE monitoring system using two Arduino boards with Dragino LoRa shields, an IR sensor for production counting, and a color sensor for quality detection in a manufacturing setting.

Freelancer

Sensors & Monitoring

ESP32 Floating Water-Quality Monitoring Prototype

Developed a floating ESP32 device for the environmental-monitoring sector that samples pH, temperature, and turbidity and pushes readings to a cloud database every 15 minutes over GSM/GPRS.

Freelancer

Bluetooth App for Arduino Multi-Sensor Readout

Created a Bluetooth app that exchanges data with a DFRobot Bluno Nano reading pH, EC, water-pressure, and RS232 sensors for the agriculture-monitoring sector.

Freelancer

Wood-Stove Thermostat Draft-Fan Controller

Designed a custom Arduino thermostat that reads cabin temperature and regulates a wood-stove draft fan, modeled on the Flame Boss controller concept.

Freelancer

Soil Sensor Pipeline to InfluxDB and Grafana

Wrote Arduino firmware to read soil VWC, bulk-EC, and temperature, convert bulk-EC to pore-EC, and stream data through InfluxDB to Grafana dashboards for the agriculture sector.

Freelancer

7-in-1 JXCT Soil Sensor over RS485 with LoRaWAN

Corrected and stabilized Arduino firmware reading a JXCT 7-in-1 soil sensor over an RS485/TTL converter for the agriculture sector, fixing multi-parameter read errors.

Freelancer

Multi-Node LoRa Soil Moisture Monitoring

Built four Arduino-based LoRa soil-moisture nodes reporting to a LoRa gateway with a remote logging application for agriculture-sector field monitoring.

Freelancer

GSM Beehive Scale Telemetry System

Built an Arduino beehive-monitoring system with calibrated weight scale, datalogging of temperature, humidity and weight, GSM telemetry, SMS GPS-position commands, and rain, battery and weight-loss alarms for the apiculture sector.

Freelancer

Connectivity & Cloud

Cellular IoT Telemetry to AWS IoT Core via MQTT

Built an Arduino-based system that brings up GPRS on a SIMCOM cellular module and securely publishes telemetry to AWS IoT Core over MQTT using device certificates, via TinyGSM and raw AT commands.

Freelancer

ESP32 WebSocket Relay Control Panel

Built a single-page ESP32 web interface served from SPIFFS that controls multiple dry-contact relays in real time over WebSocket using JavaScript and CSS.

Freelancer

Cross-Platform Liquid Intake/Output Tracker with BLE Hardware

Delivered an iOS and Android app paired with Arduino BLE hardware for a liquid tape-measure device in the health-monitoring sector, featuring alerts, notifications, and data visualization.

Freelancer

ESP-NOW Many-to-Many Mesh Messaging

Implemented ESP-NOW firmware enabling three ESP8266 boards to send and receive integer and string messages in a many-to-many topology.

Freelancer

ESP32 RFID Weighing Station with HTTP/JSON Upload

Built ESP32 firmware integrating an HX711 load cell and RC522 NFC reader, producing a wiring diagram and posting weight and tag data to an HTTP endpoint as JSON.

Freelancer

PCB & Hardware

Custom PCB for Stepper, Sensors and Heater Control

Designed a compact 60x100mm PCB integrating an Arduino Nano 33, NEMA 23 stepper control, rain and temperature sensors, and heater control for an automation product.

Freelancer

Arduino 7-Segment Digital Number Display

Designed and assembled a battery-powered Arduino Nano digital display reading 0000-9999 on a 4-digit 7-segment LED, with rotary-encoder input and a dimming control.

Freelancer

Embedded AI

ESP32-CAM Real-Time People Detection Proof of Concept

Built an ESP32-CAM object-detection proof of concept that detects people in real time with a companion mobile app for settings and detection alerts.

Freelancer

GPS-Only Heading and Autopilot Navigation

Developed Arduino code that navigates point-to-point and determines heading using only a GPS module, with no IMU, for an autopilot application.

Freelancer

Motion-Activated Audio Player on MKRZero

Developed MKRZero firmware that wakes on MPU-6050 motion, plays audio tracks from an SD card while motion persists, and returns to low-power sleep when motion stops.

Freelancer

Photodiode Scanner App with 2D Histogram

Built Arduino Uno firmware and an Android Studio Java app that sequentially lights LEDs, reads photodiode reflections over HC-05 Bluetooth, and renders a 2D histogram of the results.

Freelancer
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What clients say

“I normally do not hand out 5 ratings. In this instance I would highly recommend GizanTech for hardware and software development. They delivered on KiCAD electrical engineering and VSC C code for the PICO with a robust Pi5 C application to test BLE communications with the PICO. Thank you to Masrur and the entire team.”
Embedded + ConnectivityPICO C Project with I2C Control
“GizanTech continue to produce spectacular results for our projects. Looking forward to working with them on many future projects.”
Motor ControlESP32 Brushless Motor Torque Control
“GizanTech is a very professional outfit. Their documentation was beyond my expectations and their support through the software testing phase was fantastic! If you are new to Freelancer and looking for someone to work with I highly recommend them!”
Industrial ControlAdvanced Arduino Code and Interface Design
“Super happy with the effort from GizanTech. The IoT project was well delivered. I had issues when testing the setup on my side but GizanTech remained patient and communicated using easy-to-follow videos and documentation to resolve the issues. Thanks again!”
Industrial IoTSend Data to AWS using MQTT Protocol by SIMCOM
“He did an excellent job. I am very satisfied with his communication and knowledge; he showed professional knowledge and responsibility. I will work with him again on new projects.”
PCB + FirmwareDevelopment of PCB Board
“Masrur has been a great partner for my latest project. He and his team went over and above my expectations and kept at it until I was satisfied with the result. Communication has been great as well. Very professional. I'm continuing to work with them on future revisions of the project.”
Mobile + HardwareLiquid intake/output tracker App with Arduino hardware
Read all 61 five-star reviews →

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