The challenge. A facility periodically releases a large volume of water into a river. People downstream - across an area with minimal cellular coverage and almost no grid power - had been caught off-guard by sudden surges, with serious safety consequences. The goal: warn them in time, reliably and autonomously.

The solution. A fully off-grid, self-powered network of multi-level warning beacons (traffic-light stages + a siren), each node running on solar + battery. Nodes communicated over a long-range sub-GHz RF network spanning tens of kilometers (range verified in the field), with a tall master node providing the backbone link.

How it works. A sensor unit reads analog 4-20 mA process signals and publishes them to a private MQTT server. A processing unit ingests the data, runs an ML model (trained on historical data) and computes the required state for each beacon based on its distance / time-to-event - closer beacons escalate sooner than distant ones.

My role (engineering lead). Designed all PCBs, enclosures and most of the firmware; deployed the IoT platform; designed and field-verified the entire RF network (RF-propagation simulations confirmed on site); handled field installation hands-on, including work at height on the master node; and supervised the field & lab team.

The challenge. A large field operation was running blind - data such as shifts, soil humidity/temperature and harvest counts was logged by hand, on paper. Earlier attempts with off-the-shelf products had failed because they were too rigid to adapt to the operation's real workflow.

The solution. A fully custom, modular telemetry & control system with a React monitoring/control platform and a family of purpose-built devices:

• Datalogger - solar + battery node (sized to survive long low-sun periods), cellular connectivity, dry + 0-10V/4-20mA inputs and RS485 (used with soil humidity/temperature sensors).
• Irrigation Controller - high I/O count, WiFi/Ethernet/cellular; runs irrigation programs for groups of remote nodes and centralizes data to the cloud over MQTT.
• Irrigation Node - low-power LoRa node (solar + battery) driving solenoids for zone irrigation.
• Modular System - fixed base board with swappable function cards (Ethernet, analog in, digital in, analog out, CAN).

My role. Designed several of the boards (and their firmware), designed the LoRa network for the first deployment, carried out field installation, and managed project progress.

Outcome. Deployed successfully and later scaled to hundreds of nodes across multiple sites.

The challenge. An industrial conveyor system sheds coarse material along its length, which piles up underneath. It had to be cleared manually every day - shovel and wheelbarrow - under harsh conditions.

The solution. A purpose-built UGV resembling a backhoe, with a multi-stage telescopic arm capable of lifting hundreds of kilograms, plus custom hardware:

• Controller - a PCB stack controlling the entire vehicle.
• Remote Control - a handheld unit with button/joystick inputs and a touchscreen for control and live vehicle status.

My role. Contributed to several Controller PCBs and firmware; owned the Remote Control end to end (including its housing) and firmware; and built a reusable library framework from scratch shared across both the Controller and the Remote Control. Co-led on-site operator training.