Embedded firmware
Non-blocking ESP32 and Arduino firmware with watchdogs, persistent state and recovery behaviour designed for hardware that has to stay up.
hi, I'm Bhavesh
I build hardware that works
when the internet doesn't
Embedded systems, robotics and IoT. ESP32 firmware, motor drivers and boards I can actually repair in the field.
R&D first,
soldering iron second.
I'm an Electronics & Telecommunication diploma graduate from Government Polytechnic Amravati, and Lead Technician of the R&D Club at Sipna College of Engineering and Technology.
My process starts with the problem, not the parts list. Understand it, compare the approaches, prove the concept, then move into hardware. Even when a project already exists, I ask what I can do differently so the finished build earns its place.
I use AI tools as engineering assistants, for research, debugging, documentation and a fair amount of the code. I say so plainly because the interesting part was never typing it out. I verify the output, make the engineering calls, and test the hardware myself, which is the part no model can do for me.
15+
featured builds
#1
national, hardware division
2018
building since
Lead
technician, R&D club
What I actually build
Offline IoT
Local-first dashboards, relay control and ESP-NOW links that keep working when the router, the Wi-Fi or the cloud disappears.
Robotics electronics
Motor drivers, LiPo power paths, telemetry and competition wiring built for field repair and fast debugging under time pressure.
Edge vision
Camera-assisted workflows on ESP32-CAM, OpenCV and YOLO, bridged to hardware for attendance, traffic and identity systems.
The toolbox
Things I reach for
Sized by how often I use them, not by a number I made up.
Silicon
- ESP32 / ESP8266
- Arduino framework
- Embedded C / C++
- AsyncWebServer
- Raspberry Pi
Talking to things
- ESP-NOW
- I2C / SPI / UART
- BLE
- CAN bus
- GSM / GPS
Hardware
- Motor drivers
- Sensor integration
- PCB / circuit design
- Power electronics
- LiPo BMS
Software
- Python
- OpenCV
- HTML / CSS / JS
- YOLO
- Arduino IoT Cloud
- Google Sheets API
bigger = more hours on it
Selected work
Eleven projects worth showing
I make a lot of experiments. These are the ones with a real problem behind them.
newest, in progress
SafetyFirst PPE Checkpoint team project
An access control gate for a work site, not a monitoring dashboard. A worker taps an RFID badge, a camera checks their protective equipment against the site's live policy, and the gate either lets them through or turns them away with the reason recorded.
- YOLOv8 checks hardhat, vest and mask against a policy an admin can change mid shift, with no restart
- Refusals are photographed automatically and grants never are, which is a deliberate privacy line
- A critical sensor alert holds the gate outright, because full gear is still not safe in a gas leak
- Verified end to end in software. The Pi, RFID and GPS code is written but has not met real hardware yet
YOLOv8 / Python / Raspberry Pi / Web dashboard
Team Mojito, FAR AWAY 2026. Concept by Jasbir Singh Monga, with Priyal Vairagade
v1.0.1 active
Smart Aquarium Controller
Offline-first ESP32 automation: scheduled feeding, pump cycling and four relays, run from a mobile-first dashboard served off SPIFFS. The cloud is an extra layer, never something the tank depends on.
- Feeds the fish, cycles the pump and drives four relays with no internet at all
- Holds long uptime, once a dashboard freeze was traced to duplicate async route registration
- Recovers itself: missed feeds detected on boot, and a watchdog reboot if the cloud hangs
- Relay states restored from NVS, so a power cut cannot change what is switched on
ESP32 / AsyncWebServer / SPIFFS / Arduino IoT Cloud
Source
firmware in progress
ESP32 Race Robot
A tank drive race robot on a two ESP32 ESP-NOW link, built for minimum latency with telemetry coming back the other way. Bare chips, 43A drivers, and a remote that can trim each side independently.
- Two BTS7960 43A drivers with four Johnson 600RPM motors paired across them
- INA226 on a 25A shunt puts live current and battery on the remote's OLED
- Per side motor trim and a max speed limit, both saved to NVS
- Joystick or button control, switchable on the remote
ESP32 x2 / BTS7960 / INA226 / 3S LiPo
Source
live in 5 rooms
RainMaker Smart Switch System
A retrofit switch system running a five room house on bare ESP32-WROOM-32E modules, hand wired rather than dev boards. The wall switches keep working with Wi-Fi and the cloud fully down. Only the app and voice control need the internet.
- Five nodes and eleven relays running a whole house, on hand wired bare modules
- Wall switches keep working with Wi-Fi and the cloud completely down
- No flicker boot: reads NVS, then drives each GPIO straight to the right state
- Stays up through Wi-Fi bursts, with bulk caps on both rails to stop brownouts
- Only a heap health watchdog may restart a node, never a Wi-Fi wobble
ESP32-WROOM-32E / ESP RainMaker / NVS
Source
design phase
SigmaDSP Marshall BT Speaker
A portable Bluetooth speaker built from raw chips instead of a module, aimed at Marshall Middleton acoustics. ADAU1701 SigmaDSP, ESP32-WROVER over LDAC, TPA3116 and TPA3110 Class-D amplification, and live EQ tuning over I2C.
- Four channels of Class-D with live EQ tuning over I2C
- Whole design documented and reviewed before a single part is soldered
- I2S clocking settled: the DSP is master, running off a 12.288MHz crystal
- CY7C68013A repurposed as a DIY USBi programmer, so no proprietary tool needed
ADAU1701 / ESP32-WROVER / TPA3116 / LDAC
Design doc
RO Water Purifier Controller
Replaces the stock board in a residential RO purifier. Sequenced inlet, pump and UV cycle, TDS monitoring, dual filter life tracked in EEPROM, and relays that default off so a power cut cannot leave the pump running.
ESP32 / MAX7219 / TDS / EEPROM SourceHybrid GPS Tracker
Dual SIM800L GSM and NEO-6M GPS tracker with multi-number emergency SMS and coordinate buffering when signal drops.
ESP32 / NEO-6M / SIM800LSmart Traffic Light + CV
YOLO vehicle density analysis that retimes traffic lights, bridged to hardware over serial with one-green-at-a-time sequencing.
Python / OpenCV / YOLO / ESP8266Face Recognition Attendance
ESP32-CAM attendance system with FaceNet recognition, software flash control and live Google Sheets logging.
ESP32-CAM / FaceNet / Sheets APINodeMCU Smart Relay Panel
Four-channel relay panel with IoT Cloud control, per-channel manual override and scheduled automation. Runs my aquarium and lighting.
ESP8266 / Arduino IoT CloudFace Recognition Voting Machine
Biometric voting machine using FaceNet with triplet loss training for voter verification and duplicate vote prevention.
Python / FaceNet / OpenCVNot everything I build is a circuit board
VALVER B2B website client work
A B2B site for a steam and valve manufacturer. 27 product pages driven by content collections, an enquiry flow in place of a cart, and an image pipeline that keeps the whole thing static.
Astro / GSAP / Sharp / NetlifyCompanion robot face in progress
An expressive face for an elder-care robot. Two eyes drawn procedurally every frame, with emotions produced by interpolating a handful of numbers between presets. No image assets.
Python / pygamego on, press one
PC Dock
An old Android phone turned into an always-on desk dock: live CPU and GPU meters, a media remote and a configurable macro pad, served over the LAN with no cloud.
Node / PowerShell / Android WebViewWins worth framing
1st place, hardware division
Won the hardware category at CMR Hackfest 3.0, representing the R&D Club at Sipna College of Engineering and Technology.
2nd runner up, overall
Placed 2nd runner up overall at CMR Hackfest 3.0 against teams from across India, with an embedded systems project.
Multiple robo race podiums
Several college-level prizes, solo and with teams. At one event our entries took 1st, 2nd and 3rd in the Robo Race category outright.
How I got here
-
2023 to present
Lead Technician, R&D Club
Sipna College of Engineering and TechnologyI lead R&D-first planning, hardware design and embedded work for real builds: comparing concepts and trade-offs before anything gets soldered, then taking the result to national and college competitions.
-
2023 to 2026
Diploma, Electronics & Telecommunication
Government Polytechnic AmravatiSpecialised in embedded systems, IoT and robotics. Built hardware projects alongside the coursework, plus a long tail of experiments, and won a national hackathon along the way.
Got a hardware problem
that keeps failing?
I like the ones that only break in the field. Embedded systems, robotics, awkward power paths, sensors that lie to you. Send it over.
Amravati, Maharashtra, India