8051 zigbee interface
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The document discusses interfacing Zigbee with the 8051 microcontroller. It provides an overview of Zigbee including that it uses small, low-power devices to connect wirelessly and form networks in the 2.4GHz band. It then gives code examples in 8051 assembly and C for initializing serial communication and transmitting the string "YES" between a Zigbee module connected to an 8051 and a PC.
8051 zigbee interface
- 2. ZIGBEE • ZigBee is a specification for a suite of high level communication protocols using small, low-power digital radios based on the IEEE 802.15.4-2003 standard for wireless personal area networks (WPANs) ZigBee is a low data rate, two-way standard for industrial and domestic automation networks. • It uses small very low-power devices to connect together to form a wireless control web. The standard supports 2.4GHz unlicensed radio bands. • Popular name for the IEEE 802.15.4 standard for an extremely low power, and low bit rate wireless PAN technology, Zigbee is designed for wireless automation and other lower data tasks, such as smart home automation and remote monitoring. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 3. Preface • Zigbee Evaluation Board • The low-power XBee 802.15.4 and extended-range XBee-PRO 802.15.4 use the IEEE 802.15.4 networking protocol for fast point-to-multipoint or peer-to-peer networking. The XBee 802.15.4 platform features: • low-power point-to-multipoint/peer-to-peer networking Fast 250 kbps RF data rate No configuration needed for out-of-the-box RF communications 128-bit AES encryption. Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 4. Specifications • Module – Xbee | Xbee PRO – Specifications – Power output:: 1mW (+0 dBm) International version – Indoor/Urban range: • Up to 100 ft (30 m) • Up to 1 mile (1.6 km) RF LOS (Xbee PRO) – Outdoor/RF line-of-sight range: Up to 300 ft (90 m) – RF data rate: 250 Kbps – Interface data rate: Up to 115.2 Kbps – Operating frequency: 2.4 GHz – Receiver sensitivity: -92 dBm Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 5. Features • Spread Spectrum type: DSSS (Direct Sequence Spread Spectrum) • Networking topology: Point-to-point, point-to-multipoint, & peer-to-peer • Error handling: Retries & acknowledgements • Filtration options: PAN ID, Channel, and 64-bit addresses • Channel capacity: – XBee: 16 Channels – XBee-PRO: 12 Channels • Addressing: 65,000 network addresses available for each channel Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 6. Board Layout Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 7. Zigbee with Host PC Hell o! 2.4GHz RF Communicati on Hell o! Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 8. zigbee interface with 8051 Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 9. ZIGBEE INTERFACE ASSEMBLY CODE Write a program to transfer the message “YES” serially at 9600 baud, 8bit data, 1 stop bit interfacing with zigbee module. Do this continuously. Solution: MOV TMOD,#20H ;timer 1, mode 2 MOV TH1,#-3 ;9600 baud MOV SCON,#50H ;8-bit, 1 stop bit, REN enabled SETB TR1 ;start timer 1 AGN: MOV A,#"Y" ;transfer "Y" ACALL XMIT MOV A,#"E" ;transfer "E" ACALL XMIT MOV A,#"S" ;transfer "S" ACALL XMIT SJMP AGN ;keep doing it ;serial data transfer subroutine XMIT: MOV SBUF,A ;load SBUF HERE: JNB TI,HERE ;wait for last bit to transfer CLR TI ;get ready for next byte RET Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 10. ZIGBEE C CODE // Connect the zigbee board with the controller using serial port cable // Connect the second zigbee module to PC using serial port cable . Execute the program the data is //transferred from between the zigbee modules #include <REG51.H> /* special function register declarations */ #include <stdio.h> /* prototype declarations for I/O functions */ void serial_init(void); void serial_init(void) { SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */ TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload */ Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 11. C CODE CONTD TH1 = 0xFD; /* TH1: reload value for 9600 baud @ 11.0592MHz*/ TR1 = 1; /* TR1: timer 1 run */ TI = 1; void main(void) { serial_init(); printf (" PS - PrimerC51 UART Demonnr"); while (1) { printf ("Hello World!! nr"); /* Print "Hello World" */ } } Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.
- 12. For More Tutorials www.pantechsolutions.net http://www.slideshare.net/pantechsolutions http://www.scribd.com/pantechsolutions http://www.youtube.com/pantechsolutions Technology beyond the Dreams™ Copyright © 2006 Pantech Solutions Pvt Ltd.