Garden Lighting and Security

with the

Controller Area Network

Master/Slave Networking:

• The single master asks the slaves for information and the slaves respond after each request.
• Data Acquisition Systems
• Remote Sensing
• The single master issues a command to a slave and the slave can respond.
• Garage Doors/Car locks
• Lighting Systems
• Slave must wait till Master polls for information
• Slave just out of range can’t communicate with master.
• Good for single point to point pair for remote control or acquisition.

Peer to Peer with Multi-Master Networking using CSMA:

• Carrier Sense Multiple Access allows multiple nodes to access wireless medium.
• Nodes Listen, then wait a random amount of time, then listen and if bus clear send.
• Nodes don’t know if someone else damaged their message until destination node replies.
• Protocol overhead can require a lot of extra software.
• IEEE 802.11 PC Networking
• BlueTooth
• Nodes can use spread spectrum to better utilize band or share band.

CANRF Networking (not a CAN to CAN wireless bridge):

• Multiple nodes use CAN bitwise arbitration to determine who stays transmitting and who starts receiving the message.
• CANRF modules use On Off Keying Modulation to represent dominant(0) and recessive(1) bits.
• Small Code footprint for node because the network communications is done by CAN MCP2510 device.
• Slave Nodes can forward messages from other slaves to expand the range of the network.
• Inexpensive at $99US Qty. 1.
• CANRF RF portion can interface directly to embedded CAN processors.
• Software for PIC microprocessors.

Some of the products or prototypes that use the CANRF.

Companion Board for Spectrum Digital Evaluation Board

[Products for Sale]

Please direct any comments or questions to: webmaster@canrf.com
This page last updated July 30,2003
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