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Module 5: External Communication Interface

20257m

Explain the interfacing of wireless communication protocols in embedded systems.

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Wireless Communication Protocols in Embedded Systems

  • Bluetooth (IEEE 802.15.1): 2.4GHz, 10m/100m, 1-3Mbps, piconet, for HID/audio. Interfaced via HC-05 UART as Q15.
  • Zigbee (802.15.4): 2.4GHz, mesh, low power, 250kbps, 75m, for sensor networks/Home automation. XBee UART.
  • WiFi (802.11): High bandwidth, ESP8266/ESP32 via UART/SPI.
  • RF (nRF24L01): SPI, 2.4GHz proprietary.
  • LoRa: Long range, sub-GHz, for IoT.
  • IR: Short range.

8051 interfaces via UART/SPI: module handles RF stack; MCU sends AT/data via serial. Choice depends on range, power, data rate, mesh.

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