Technology Used in IoT

In IoT, several technologies are used to connect multiple network devices and smart objects. These technologies include:

1. Bluetooth

Bluetooth is a short-range wireless communication technology used to exchange data between devices like smartphones, laptops, and headphones.

• Range: Typically 10 meters (can go up to 100 meters in newer versions)
• Frequency: 2.4 GHz ISM band (2.402 GHz – 2.480 GHz)
• Uses UHF radio waves
• Introduced in 1998 and managed by the Bluetooth Special Interest Group (SIG)
• Based on IEEE 802.15.1 standard
• Features: Low power consumption, secure communication, supports voice and data

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2. Wi-Fi (Wireless Fidelity)

Wi-Fi is a wireless networking technology used to connect devices to the internet or local networks.

• Based on IEEE 802.11 standards
• Frequency bands: 2.4 GHz, 5 GHz (and 6 GHz in Wi-Fi 6E)
• Range: Around 20–100 meters depending on environment
• Uses a wireless router/access point to transmit signals

Applications: Internet access, file sharing, smart devices connectivity

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3. Li-Fi (Light Fidelity)

Li-Fi is a wireless communication technology that uses light waves (LED light) to transmit data.

• Introduced by Harald Haas in 2011
• Uses visible light spectrum instead of radio waves
• Very high speed (can be faster than Wi-Fi)
• Requires line-of-sight (light must be visible)

Applications: Smart lighting, underwater communication, secure data transmission

4. Zigbee

Zigbee is a low-power, low-cost wireless communication technology designed for short-range data transmission between devices.
It is based on the IEEE 802.15.4 standard.

• Used in: Home automation, IoT devices, smart lighting
• Range: 10–100 meters
• Features: Low power consumption, mesh networking (devices can relay data)

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5. Sigfox

Sigfox is a Low Power Wide Area Network (LPWAN) technology used for long-range communication with very low energy usage.

• Used in: Smart meters, asset tracking, environmental monitoring
• Range: Up to several kilometers (even 10–50 km in rural areas)
• Features: Low data rate, long battery life (years)

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6. RFID (Radio Frequency Identification)

RFID is a wireless technology used to identify and track objects using radio waves.

Main Components:

• Tags (Transponders):
  • Active Tag:
    • Has its own power source (battery)
    • Range: Up to 100–150 meters
    • Sends signals actively
  • Passive Tag:
    • No internal power source
    • Uses energy from the reader
    • Short range (a few centimeters to meters)
• Reader (Interrogator):
  • Contains transmitter, receiver, and antenna
  • Sends signals and receives data from tags

Applications: Inventory management, ID cards, toll systems

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7. NFC (Near Field Communication)

NFC is a short-range wireless communication technology that allows devices to exchange data when placed very close together.

• Range: Typically up to 4 cm (practically ~1–2 cm)
• Used in: Contactless payments, metro cards, access control
• Based on: RFID technology

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8. Z-Wave

Z-Wave is a wireless communication protocol mainly used for smart home automation.

• Used in: Smart locks, sensors, home automation systems
• Range: ~30–100 meters
• Features:
  • Low power consumption
  • Mesh networking
  • Operates on a different frequency than Wi-Fi → less interference