The Internet of Things (IoT) is embedded systems with connectivity: devices that sense or control something and exchange data over a network. Every IoT device is an embedded system, but an embedded system becomes an IoT device only when it is connected and part of a larger system of devices, gateways and cloud services. The relationship matters because IoT adds networking, security and data handling to the classic embedded skill set.
What an IoT device is made of
- Sensors and actuators: temperature, motion, light, gas, pressure, GPS; relays, motors, valves, displays.
- A microcontroller or small processor: reads the sensors, runs the control logic, manages power. See microcontrollers in embedded systems.
- A wireless or wired interface: Wi-Fi, Bluetooth Low Energy, Zigbee, Thread, LoRaWAN, NB-IoT, LTE-M, Ethernet.
- Firmware: device logic, communication stack, power management, over-the-air update and security.
- A power source: mains, battery or energy harvesting, which sets the power budget for everything else.
This is the standard embedded architecture (see embedded system architecture) with a radio and a network stack added.
The IoT system architecture
- Device (edge) layer: the embedded nodes that sense and act.
- Gateway layer: aggregates local devices (for example over BLE or Zigbee) and bridges to the internet; may run local processing on embedded Linux.
- Network layer: transports data over cellular, Wi-Fi, LPWAN or wired links.
- Cloud / platform layer: device management, data storage, analytics, dashboards and integration with business systems.
- Application layer: the mobile app, web dashboard or automated process that uses the data.
Communication protocols
| Layer | Common choices | Notes |
|---|---|---|
| Short-range wireless | BLE, Zigbee, Thread, Wi-Fi | BLE for wearables and phones; Zigbee/Thread for mesh home networks; Wi-Fi where power is available |
| Long-range low-power | LoRaWAN, NB-IoT, LTE-M, Sigfox | Kilometres of range at very low data rates; years on a battery |
| Wired | Ethernet, RS-485/Modbus, CAN | Industrial and automotive |
| Application | MQTT, CoAP, HTTP/REST, AMQP | MQTT publish/subscribe is the most common for devices; CoAP for constrained nodes |
| Security | TLS/DTLS, secure boot, hardware keys | Non-negotiable for any device on a network |
What IoT adds to embedded design
- Power budgeting for radios: transmitting is expensive; firmware sleeps the radio and batches data.
- Security: secure boot, encrypted storage, authenticated communication, signed firmware updates. A compromised device can be a foothold into a network.
- Over-the-air updates: fielded devices must be updatable for years.
- Provisioning and device management: identity, onboarding, monitoring thousands of units.
- Edge computing: filtering, compression and increasingly machine-learning inference on the device to reduce data sent and respond faster.
- Interoperability: standards such as Matter for smart home and OPC UA for industry.
Examples
- Smart agriculture: soil-moisture nodes on LoRaWAN report hourly; a gateway forwards to the cloud; irrigation is scheduled from the data.
- Industrial monitoring: vibration sensors on motors detect bearing wear with on-device analysis and alert before failure.
- Smart metering: electricity and water meters report over NB-IoT, removing manual reading.
- Wearables: a BLE heart-rate band syncs to a phone app, which uploads to a health platform.
- Fleet tracking: GPS and cellular trackers with accelerometers log position and driving behaviour.
- Smart home: thermostats, locks, lights and cameras on Wi-Fi, Zigbee or Thread, controlled from a phone or by automation rules.
More application areas are listed in applications of embedded systems.
Skills for IoT embedded engineers
Everything a classic embedded engineer knows (C, microcontrollers, peripherals, RTOS, debugging) plus wireless protocol stacks, network programming, MQTT/CoAP, TLS and secure boot, power optimisation for battery devices, and familiarity with at least one cloud IoT platform. Our embedded systems course includes IoT connectivity and cloud integration with hands-on projects; see also embedded and IoT project ideas.
Frequently asked questions
What is the relationship between embedded systems and IoT?
IoT devices are embedded systems with network connectivity. Embedded systems are the hardware and firmware foundation; IoT adds communication, cloud services and system-level data handling.
Is every embedded system an IoT device?
No. A washing machine controller or an engine ECU without a network connection is an embedded system but not an IoT device.
Which protocol is most used in IoT?
MQTT is the most common application protocol for device-to-cloud messaging. For wireless links, BLE, Wi-Fi, Zigbee and LoRaWAN are the most common depending on range and power needs.
What is edge computing in IoT?
Processing data on or near the device instead of sending everything to the cloud, to reduce latency, bandwidth and power, and to keep working when the connection drops.
Why is security important in IoT?
Connected devices are reachable from the network and often unattended for years. Without secure boot, encryption and authenticated updates they can be hijacked, used in attacks or leak data.
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