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Module 5: External Communication Interface

20207m

Explain the interfacing of Bluetooth and Zigbee with the 8051 microcontroller.

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Interfacing Bluetooth and Zigbee with 8051

Both use UART (RS232 level via MAX232 or 3.3V logic via voltage divider) on P3.0/P3.1.

Bluetooth (e.g., HC-05):

  • VCC 5V/3.3V, GND, TX→8051 RxD (P3.0), RX→8051 TxD (P3.1) via divider, EN/KEY for AT mode.
  • Config 9600 baud (TH1=0FDH). Send AT commands via serial: AT+NAME, AT+PIN.
  • Data: Write SBUF, poll TI; receive interrupt RI. Add 3.3V regulation if needed.

Zigbee (e.g., XBee S2):

  • Pins: VCC 3.3V, GND, DIN→TxD, DOUT→RxD, plus CTS/RTS optional.
  • Uses 802.15.4, mesh. Config via X-CTU: PAN ID, Channel, MY/DH/DL addresses.
  • UART frames same as above; API vs AT mode. Baud 9600/115200.
  • For 5V 8051, level shift 5V→3.3V on DIN.

Software common: Initialize serial mode 1, Timer1 baud, then MOV SBUF,A transmit to module; module handles wireless to peer. Receive bytes via ISR and process.

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