The Pedxing project is to develop a Power over Ethernet (PoE) small sensor and effector module network for a robotic platform. Power over Ethernet (PoE) IEEE 802.3af [
ETH] [
POE] compliant modules would provide power and data to modules from local or remote points. The access could be from anywhere on the Internet. PoE Powered Devices and PoE Power Sourcing Equipment hubs would provide a method to cascade low-powered distibuted modules. The Pedxing robot base itself is also a PoE Powered Device. The project results will easily apply to generalized networked sensors. All electronic sensors and effectors require power and communication, typically bi-directional. PoE provides both over a single standardized cable. With Internet Protocol (IP) transmitted over Ethernet, PoE sensor interfaces adhere to the world-wide accepted standards for communication. A large number of IP applications and protocols are available for a variety of tasks such as sensor read access (Web browsers), management, maintenance, and monitoring (SNMP), Plug and Play (ARP, DHCP), and authorization and security (IPsec). [
IETF] [
SNMP] [
ARP] [
DHCP] [
IPSEC] [
STE]
Pedxing Concept
The concept cartoon in Figure 1 illustrates the communication and power distribution paths for the Pedxing robot and its modules. The market goal of the Pedxing project is to develop and productize a small, inexpensive robot with easy-to-use interfaces that will be used in education and research. By addressing the architecture issues of communication and power from the beginning, Pedxing will be the foundation RoadNarrows will exploit to develop additional PoE robot product lines for new markets.

Figure 1: Pedxing Physical and Power Layers
Power over Ethernet
Power over Ethernet (IEEE 802.3af) is a relatively new standard adopted in 2003 that specifies how power and communication is provided over standard Ethernet cables and connectors. Up to 48 volts and nearly 13 watts of power are available for the Powered Devices [
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Conceptual Drawings
Click
here to view the conceptual drawings of the Pedxing robotic platform.