KEDARESWARKUMAR KAAVURI

SELECTED WORK / TECHNICAL PORTFOLIO

Projects

Engineering projects across sensing, connectivity, power electronics and aerospace.

Earlier project details were last updated in 2022. The aerospace overview reflects my current work.

01 / SELECTED WORK

Different challenges.
Same restless curiosity.

Project summaries, original specifications, responsibilities and photos are included with each project.

01 · AEROSPACE
✦
ENGINEERING FOR
WHAT COMES NEXT.

SKYROOT AEROSPACE · AVIONICS

Electronics behind flight

Hardware development, board bring-up, qualification testing, and integration in an aerospace environment.

My contribution

  • Hardware development and PCB design, followed by board bring-up and debugging.
  • Qualification work involving EMI/EMC, thermal and vibration testing.
  • Assembly and integration of electronic hardware into larger systems.

Focus: avionics hardware · PCB design · bring-up · qualification · system integration

02 · CONNECTED SYSTEMS
P●
SMARTER PONDS.
CONNECTED HARDWARE.

ERUVAKA · EMBEDDED & IoT

PondMother & PondGuard

Embedded hardware for automated feeding, water monitoring, and connected aquaculture systems.

PondMother

OverviewAn aquaculture feeding system with scheduled and automatic modes, designed to improve feed conversion efficiency and reduce manual errors and feed waste.

PondMother hardware

Responsibilities

  • Hardware: product specifications, schematic capture, PCB layout in Altium, board debugging and validation.
  • Firmware: microcontroller test firmware in Keil.

Hardware specifications

  • STM32 microcontroller
  • Graphical LCD interface
  • UART, RS485, GPS, LoRa and Bluetooth LE 5.0
  • Solar charging and hardware optimised for battery operation
  • Revisions optimised for testability
Design team
1 hardware engineer · 2 embedded engineers
Versions
3

PondGuard

OverviewReal-time monitoring of pond dissolved oxygen and water temperature, with control of aerators and feeders. The system helps farmers manage energy use, feeding and water conditions.

PondGuard monitoring unit and solar panel beside a pond

Responsibilities

  • Hardware: product specifications, hardware roadmap, schematic capture, PCB layout in Altium, validation and test plans.
  • Firmware: microcontroller test firmware in Keil.

Hardware specifications

  • STM32 microcontroller
  • Graphical LCD interface
  • UART, RS485, GPS, LoRa and Bluetooth LE 5.0
  • Onboard solar charging and hardware optimised for battery operation
  • Analog signal processing for the oxygen sensor and ADC interface
Design team
1 hardware engineer · 2 embedded engineers
Versions
1
03 · AUTONOMOUS SYSTEMSA PATH FROM
IDEA TO AUTONOMY.

ERUVAKA · CONTROL & CONNECTIVITY

NAVIS

Motherboard and remote-controller design for an autonomous shrimp-feeding vessel.

OverviewAn autonomous, rechargeable electric vessel for shrimp feeding. It follows a route configured through an Android application, allowing a mobile feeder to cover the pond.

Motherboard design

Responsibilities

  • Hardware: system block design, schematic capture and PCB layout in Altium.

Hardware specifications

  • System-on-module hardware design
  • High-power motor control with PWM and PPM regulation
  • UART, GPS and Wi-Fi interfaces
  • Inrush-current and voltage-spike protection, with filtering for high-power inductive loads
  • Solar charging and hardware optimised for battery operation
  • High-speed digital interfaces
Design team
2 hardware engineers · 2 embedded engineers
Versions
1

Remote controller design

Responsibilities

  • Hardware: system block design, schematic capture and PCB layout in Altium.

Hardware specifications

  • RP2040-based hardware
  • LoRa connectivity
  • AA battery charging and USB charging support
  • Graphical OLED display
  • Joystick controls
Design team
1 hardware engineer · 1 embedded engineer
Versions
1
04 · MIXED-SIGNAL DESIGNSMALL SIGNALS.
MEANINGFUL MEASUREMENTS.

ERUVAKA · ANALOG & SENSING

Optical dissolved oxygen sensor

Analog front-end design to turn optical measurements into useful water-quality data.

OverviewAn optical sensor for measuring dissolved oxygen in water and other liquids, with readings shared over an RS485 interface.

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium, mixed-signal design, test planning and design documentation.

Hardware specifications

  • Analog hardware built around operational amplifiers
  • Transimpedance amplifier design
  • Onboard signal generators and comparators
  • Noise control for transimpedance and signal amplification circuits
  • XOR-based phase detection
Design team
1 hardware engineer · 2 embedded engineers
Versions
2

05 / ERUVAKA · POWER ELECTRONICS

PondRunner

Three-phase motor control and energy-monitoring hardware, from MCU boards to isolated measurement systems.

OverviewA three-phase motor control and monitoring device for pond aerators and energy use. It supports scheduled operation and an automatic mode driven by dissolved oxygen readings from another device.

MCU board design

Responsibilities

  • Hardware: hardware roadmap, schematic capture, PCB layout in Altium, validation and test plans.
  • Firmware: microcontroller test firmware in Keil.

Hardware specifications

  • STM32 microcontroller
  • Graphical LCD interface
  • UART, RS485, GPS, LoRa and Bluetooth LE 5.0
  • Battery backup with automatic cut-off and current limiting
  • Eight onboard relay channels with isolated DC power for three-phase motor control
Design team
1 hardware engineer · 1 embedded engineer
Versions
4

Energy meter board design

Responsibilities

  • Hardware: design, testing and validation of three-phase energy systems; electrical panel wiring and prototypes; integration of PCBs with MCBs and contactors; schematic capture, PCB layout in Altium and test documentation.
  • Firmware: libraries for the onboard analog front end and test firmware.

Hardware specifications

  • Analog front end for three-phase monitoring using current transformers
  • Onboard conversion from 440 V three-phase AC to 12 V DC
  • Electrical clearances and isolation for 440 V operation
  • PCB interfaces for MCBs, MPCBs and contactors
  • Isolated, multiplexed communication with the host microcontroller
  • Isolated DC/DC conversion with up to 2 kV isolation capability
Design team
1 hardware engineer · 1 embedded engineer
Versions
4
LTE gateway hardware

06 / ERUVAKA · COMMUNICATIONS

LTE gateway

Connected hardware combining cellular access, Wi-Fi, and power management for remote environments.

OverviewAn LTE gateway that uses a SIM card to provide a Wi-Fi access point for nearby devices, with a focus on rural locations with limited network coverage.

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium, antenna analysis, test planning, wire-harness preparation and documentation.

Hardware specifications

  • System-on-module and microprocessor-based hardware
  • Design for cost efficiency and reliability
  • Three onboard power rails
  • Onboard USB-to-Ethernet conversion and 24 V output for PoE LAN
  • Onboard solar charging and hardware optimised for battery operation
  • SDIO and USB digital interfaces
Design team
1 hardware engineer · 2 embedded engineers
Versions
4
ShrimpTalk hardware07 / PROJECT

ERUVAKA TECHNOLOGIES · AQUACULTURE

ShrimpTalk

Shrimp appetite monitoring with underwater acoustics, designed to help make feeding more responsive.

My contribution

  • Schematic and PCB design
  • Embedded hardware support
  • Sensor integration and product validation

OverviewAn underwater acoustic feeding system that responds to shrimp appetite. Continuous monitoring supports more responsive feeding, reduced feed waste and better water quality.

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium, test planning and documentation.

Hardware specifications

  • System-on-module hardware design
  • Audio codec integration for the hydrophone
  • Five onboard power rails
  • Onboard solar charging and hardware optimised for battery operation
  • SDIO and USB digital interfaces
Design team
1 hardware engineer · 2 embedded engineers
Versions
1

ERUVAKA TECHNOLOGIES · POWER & CONTROL

Feed blower

Three-phase motor-control hardware for moving feed from shore to pond-side feeders.

My contribution

  • Three-phase motor-control hardware
  • Board design and validation
  • Integration with feed-transfer equipment

OverviewThree-phase motor control for a blower that transfers feed from the shore to feeders in a pond.

Responsibilities

  • Hardware: design, testing and validation of three-phase energy systems; electrical panel wiring and prototypes; integration of PCBs with MCBs and contactors; schematic capture, PCB layout in Altium and test documentation.
  • Firmware: analog front-end libraries and test firmware for watchdog testing and debugging.

Hardware specifications

  • STM32 microcontroller
  • Graphical LCD interface
  • UART, RS485, GPS, LoRa and Bluetooth LE 5.0, with clearances and isolation for 440 V
  • PCB interfaces for MCBs, MPCBs and contactors
  • Isolated communication between the live side and the host microcontroller
  • Eight onboard relay channels with isolated DC power for three-phase motor control
Design team
1 hardware engineer · 1 embedded engineer
Versions
4

ERUVAKA TECHNOLOGIES · POWER ELECTRONICS

Solar charge controller

Battery charging and protection hardware for solar-powered product systems.

My contribution

  • Solar charging and battery protection
  • Power-stage and control design
  • Prototype validation

OverviewA controller for regulating battery charging and discharging, including protection against overcharging, excessive discharge and electrical faults.

Responsibilities

  • Hardware: lead-acid battery charging and discharging systems, hardware integration, schematic capture, PCB layout in Altium, validation and test plans.
  • Firmware: charging algorithm, PWM control and STM8 firmware development.

Hardware specifications

  • STM8 microcontroller
  • LED status indicators
  • High-power MOSFETs with attention to heat distribution
  • Reverse-voltage, overvoltage, overcurrent, undervoltage and short-circuit protection
Design team
1 hardware engineer · embedded development
Versions
3
LTE voice assistant hardware10 / PROJECT

VINX · CONNECTED DEVICES

LTE voice assistant

An LTE-connected home-automation gateway with voice-assistant features.

My contribution

  • LTE connectivity and gateway hardware
  • Home-automation integration
  • Prototype bring-up and testing

LTE-based digital voice assistant

OverviewAn LTE-connected gateway and digital voice assistant for home automation, combining network connectivity, audio input and connected-device control.

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium, and documentation for manufacturability and testability.

Hardware specifications

  • Raspberry Pi Compute Module 4 hardware
  • Low-power hardware and USB battery charging
  • Onboard digital MEMS microphone
  • EC20 module for LTE connectivity
Design team
1 hardware engineer
Versions
1
UHF attendance & hygiene systems hardware11 / PROJECT

VINX · IDENTIFICATION & AUTOMATION

UHF attendance & hygiene systems

A UHF-based entry attendance system, with related transmitter, receiver and touch-free sanitizer projects.

My contribution

  • UHF reader and card-detection system
  • Transmitter and receiver hardware
  • Related touch-free sanitizer project

Attendance system using UHF reader

OverviewAn entrance attendance system that reads RFID cards using UHF readers. It sends attendance data over LoRa to a receiver, where a graphical interface displays the information in real time.

UHF transmitter

UHF transmitter hardware

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium, and documentation for manufacturability and testability.
  • Firmware: STM32 transmitter firmware using the Wiegand protocol.

Hardware specifications

  • STM32 microcontroller
  • Dual buzzer and UHF reader interfaces
  • Long-range LoRa transmission
Design team
1 hardware engineer · embedded development
Versions
1

UHF receiver

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium, and documentation for manufacturability and testability.
  • Firmware: Python code to read LoRa data and send packets to the graphical interface.

Hardware specifications

  • Raspberry Pi Zero hardware
  • LoRa data reception
Design team
1 hardware engineer · embedded development
Versions
1

Smart sanitizer dispenser

OverviewA touch-free dispenser developed during the COVID-19 period. It detects hand placement, dispenses a set amount of sanitizer and provides an audio greeting.

Smart sanitizer dispenser hardware

Responsibilities

  • Hardware: block design, schematic capture, PCB layout in Altium and assembly documentation.
  • Firmware: STM32 dispenser control developed to the provided operating requirements.

Hardware specifications

  • STM32-based hardware
  • Multiple sensor interfaces
  • Graphical LCD interface
  • Single 220 V power input
Design team
1 hardware engineer · embedded development
Versions
1