RFXCOM RFXtrx433 Especificaciones descargar pdf (Pagina 36)

Chapter 3. Concept 29

3.2. Hardware

Many diﬀerent HA systems are available on the market, but in this work only two of them are

considered: HomeEasy (HE) and Intertechno (IT). HomeEasy was chosen because it has already

been used at the research group. Several devices, such as light switches, had already been

installed for everyday usage and there had also been approaches to integrate HomeEasy into the

Cognitive Environment [4] by developing an Arduino based transceiver

and a ROS package for

the HE853EU USB dongle

. As a second HA system, Intertechno and other HX2262 relatives

were chosen, because they are cheap and widely available. Both systems are very simple and lack

further intelligence. This makes them suitable for easy integration in IE.

The gateway WiﬁControl 433 was used, as it had been designed exactly for this task by the by

the author in a recent student project "Implementation of an Ethernet gateway for wireless home

automation". Nevertheless, it had to be enhanced to be used out-of-the-box in the IE.

3.3. Software

The software shown in Figure 3.2 consists of several parts, each of which has only a single task

to ensure maximum ﬂexibility. However, this would rapidly increase data traﬃc, therefore a

compromise was made and the software is divided in just three ROS nodes as shown in Figure 3.3:

gateway driver, device manager and visualization.

ROS

gateway

driver

device

manager

visualization &

namespaces

processing and abstraction module

to gateway to IE

Figure 3.3.: The software part of the communication chain, which contains three ROS Nodes.

ROS serves as a link between the nodes connecting them and oﬀering the interfaces

for the IE. The gateway, however, is not directly connected to ROS; instead it is

connected to the gateway driver node, which allows indirect access over ROS.

The gateway driver node is the ﬁrst abstraction level. It aims to provide a uniﬁed interface

to exchange raw protocol data, so that the next software layer does not need to know speciﬁc

information about the used gateway and the protocol timings. As a result, diﬀerent gateways can

be combined and multiple gateways can run concurrently.

http://mediabox.grasp.upenn.edu/roswiki/doc/api/homeeasy_transciever/html/index.html

http://mediabox.grasp.upenn.edu/roswiki/doc/api/homeeasy_dongle/html/index.html

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 94 95

Sin comentarios

RFXCOM RFXtrx433 Especificaciones Pagina 36