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Chapter 2. Related Work/Fundamentals 12

HomeEasy

HomeEasy (HE) is a simple wireless home automation system produced by the British company

CH Byron

. It is designed for simple tasks such as switching lights on and oﬀ and time scheduled

switching; complex controls cannot be realized. HE devices are inexpensive and can often be

found in local hardware stores. The product range includes devices to control:

• Lights: on/oﬀ switching and dimming.

• Electrical appliances: on/oﬀ switching by connecting or disconnecting them from the mains.

• Multimedia: TV/DVD/Receiver via optical IR

• Security: Motion sensors and access control systems

HE devices are marketed by Byron outside the EU and by ELRO

within the EU, as well as by some

other national companies. Some of these companies sell their own automation systems, which do

sometimes have a remarkable resemblance to HE, for example Klik on Klik oﬀ, Bye Bye Standby or

Nexa. These systems can partly communicate with HE devices, but there is no true compatibility.

Therefore, they will no longer be concerned within this work. There are incompatibilities within

the diﬀerent HE devices, due to the lack of standardization of the protocol and signiﬁcant changes

to hardware over the course of time. The initial protocol (ﬁgure 2.5) is similar to the protocol of

the HX2262 chip, as used in Intertechno (section 2.2.4 on page 14); later versions use a dedicated

microcontroller. There are great diﬀerences between the UK-series (sold in the non EU) and the

EU series. Both series have a completely diﬀerent protocol and are incompatible despite a similar

product range. Within the UK series, there are some other incompatibilities due to diﬀerent

protocols and the encryption of data for some products. This leads to a complex list of which

devices can communicate with each other. However, the manufacturer states that all devices are

compatible with each other, which is probably true for the current series and not for the many

diﬀerent versions, which can still be found on the market. This work will only consider devices of

the EU-series.

Speciﬁcations HE devices form loosely connected networks, in which sensors are normally linked

to just one or two actuators. Sensors can theoretically be connected to an inﬁnite number of

actuators, whereas an actuator can only relate to a maximum of six sensors. This can be explained

by the fact, that an actuator can only store a maximum of six addresses in its memory. Connections

are established by learning: the actuator is put into learning mode, which will tell it to store the

next received valid address into its memory. Once the address is saved, sensor and actuator are

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www.elro.eu

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