Definition
The Internet of Things is a design pattern: physical objects — devices, machines, environments — that carry sensors, connect to a network, and produce data that is stored, analysed and acted on.
A single IoT device is not interesting. The value is in the system: many devices reporting into a platform that can visualise, alert and control.
The four layers
- Device — sensors, actuators, a microcontroller, a power source.
- Connectivity — Wi-Fi, Bluetooth, LoRaWAN, cellular (NB-IoT, LTE-M, 5G), or industrial protocols.
- Platform — cloud services that ingest, store and route messages: MQTT brokers, time-series databases, device management.
- Application — dashboards, alerts, control loops, analytics.
Every real IoT project must decide something at each layer. Getting two right and one wrong causes most system failures.
Where IoT is real today
- Industrial monitoring — vibration, temperature, flow, energy
- Fleet and asset tracking
- Smart buildings — HVAC, occupancy, lighting
- Agriculture — soil, weather, irrigation
- Consumer — home hubs, wearables, connected appliances
Design decisions that matter
- Power — battery-powered devices need low duty cycles and efficient radios.
- Connectivity — high-bandwidth vs low-power range vs cost.
- Security — devices must authenticate, encrypt and be updatable.
- Data model — what is stored, what is aggregated, what is discarded.
- Failure modes — networks drop, batteries die, sensors drift. The system must tolerate this.
IoT and adjacent skills
An IoT engineer often works across embedded systems, networking and cloud. It rewards breadth. VLSI does not usually come into play, but understanding embedded systems does.