Nehemiae Roy

Experience

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  4CLIMATE | CEA AUTOMATIONS

  Jul 2021 - Oct 2021

  Hardware Engineering Intern

  • Researched on the feasible methods of connecting IoT hubs to the cloud, in rural India, and presented specific case studies of cloud connections in different domains• Studied M2M communication and compared IoT service providers versus local network providers• Summarized a list of 2G MODEMs supported in India along with feature and price comparisons• Briefly studied satellite based location tracking using GPS and GNSS modules• Prepared the BoM to test the SIM800L using the ESP32 and also designed the power circuitry • Developed the response-based and autonomous code for initializing the GSM module, establishing connection with the operator, getting operator details with USSD codes, opening a TCP/IP connection and sending GET or POST commands• Tested uploading sample data to the cloud using ThingSpeak servers, dweet.io servers and freeboard.io dashboard • Developed the code for cell tower location detection using OpenCelliD database with average location accuracy• Performed extensive environment and data consumption testing• Created the circuit schematic using Autodesk EAGLE• Presented the important design specifications required while designing the PCB for the SIM800L module Show less

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  Energy ETA (Thermelgy)

  May 2022 - Oct 2022

  IoT Firmware Engineering Intern

  • Developed test firmware for in-house developed external IO card for I2C, RS485, digital I/O and relay output modules• Solved the UART buffer issues for GSM communication using HardwareSerial• Learnt about string literal optimizations using F() macro• Worked on allowing mDash IoT device management platform, to connect over GPRS, using the PPP mode of Quectel M66 GSM module and the lwIP TCP/IP stack of the ESP32• Researched on IoT device management alternatives• Debugged brownout issues on ESP32 devices• Worked extensively with the SPIFFS virtual file system on the ESP32 to maintain growing buffer files, avoiding data corruption• Created a generic BMIoT platform solution that can manage Modbus RTU slaves, and is configured using JSON files loaded on the SPIFFS partition• Worked on a script engine layer to run remotely updatable scripts in Lua on top the ESP32 firmware to control a BMIoT system• Provided RTC triggering, RPC triggering and NVS integration with Lua engine• Performed site visits for equipment testing and on-site firmware validation Show less

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  MathWorks

  Jan 2023 - now

  • Embedded Software Engineer

    Nov 2023 - now

  • Engineer in Engineering Development Group

    Jun 2023 - Nov 2023

  • Intern in Engineering Development Group

    Jan 2023 - Jun 2023