Appliance Control: Making Things Do Stuff - Smart Home Automation with Linux and Raspberry Pi - page 9

Figure 1-3. The LW10U, 85 × 85 × 30mm
In addition to being controlled remotely by “on,” “off,” “dim,” and “bright” commands, the same functionality is
available locally through the switch. Touching it once switches the light to full on or off, whereas keeping it held down
will dim the light (if it is bright) or brighten it (if it is dim). Alas, the last brightness is not kept when you switch it off
and then on again, nor can you slightly increase the brightness of a dim light without first making it fully dark, but
local control means the light comes on immediately after pressing the button so as to not confuse any guests.
This device also responds to the “all lights on” and “all units off ” messages for matching house codes.
MicroModule with Dimmer (LWM1)
This module is a turbocharged version of the LM10U and is shown in Figure 1-4 . It works in the same way as the
LM10U but is small enough to fit inside the wall outlet, allowing you to use any switch fascia you prefer.
Figure 1-4. The LWM1, 40 × 40 × 15mm