Portfolio
12 builds spanning industrial automation & embedded systems, robotics & control, and lab instrumentation — each with hardware notes, highlights, images, and the actual firmware/analysis code.
End-to-end AGV built for cost-effective, sustainable industrial use. A dynamic state machine (Active/Standby/Deep Sleep) plus MOSFET peripheral power gating and tuned PWM delivered a ~12% reduction in energy consumption while holding navigational performance.
A master-slave benchtop system mimicking commercial continuous-culture platforms — a Raspberry Pi orchestrates and logs while an Arduino handles real-time sensor polling and peristaltic-pump actuation, all housed in custom Fusion 360 enclosures.
A localized IoT network — a NodeMCU (ESP8266) edge controller driving a 16-channel opto-isolated relay module to safely switch high-voltage appliances and lab equipment, with PIR/LDR smart-lighting energy optimization and a custom MIT App Inventor Android dashboard.
A teleoperated NodeMCU rover that scans book ISBNs with a TTL barcode scanner and queries a Python/Flask mock database over a REST API to return shelving coordinates.
Capstone smart-irrigation system — a NodeMCU RC rover with a submersible pump distributes water across irregular garden areas, while capacitive soil-moisture + DHT11 sensors stream to ThingSpeak for real-time analytics and remote threshold management.
A mobile robotic platform for inspecting oil & gas infrastructure — it patrols a facility, fuses MQ-series VOC gas sensors with MLX90640 thermal imaging to spot the cold spots left by expanding leaking gas, and syncs stationary + mobile ESP32 nodes over MQTT.
Custom Python ROS drivers characterize sensor noise via Allan Variance and fuse magnetometer + gyro yaw with a complementary filter; a causal “moving-frame” zero-velocity update compensates IMU drift, and kinematics (accounting for sensor offset from the center of mass) reconstruct the trajectory against GPS ground truth.
A 17-DOF aluminum bipedal robot driven by an 18-channel servo controller, with dual-mode teleoperation over a PS2 wireless joystick and a Wi-Fi-hosted ESP32 web server.
A portable, low-cost spectrophotometer measuring OD600 directly in 19 mm culture tubes. Built across two iterations — from a prototype validating the optical path (analog photodiodes vs. a TSL2591 digital sensor) to a standalone smart device (Arduino Nano 33 IoT, capacitive TFT UI, light-baffled 3D-printed chassis). Beer-Lambert + a 4-Parameter Logistic regression map raw absorbance to a SpectraMax benchmark.
A benchtop chamber (20–80 °C) for polymer-degradation testing and sample incubation, with a two-phase (pre-heat/hold) closed-loop algorithm to minimize overshoot, a capacitive touchscreen UI, dual-channel CCT lighting for time-lapse imaging, and software over-temp safety.
A compact CH₄ monitor for sealed lab vials — a Seeed XIAO ESP32C3 + SEN0565 methane sensor + I²C OLED, in a Fusion 360 enclosure with a butyl-rubber-stopper collar for airtight syringe injections without breaking the anaerobic environment.
Reverse-engineered a commercial LOMI composter to drop its operating temperature from ~100 °C to a biologically useful ~50 °C — not by touching the firmware, but by soldering a precision parallel resistor across the NTC thermistor (CN5) to bias the analog feedback loop. Characterized empirically with a DS1922T iButton; a 19.3 kΩ resistor settled at ~49.6 °C.