In latin Fiat Lux means “Let There Be Light” and is the first example that include a distributed architecture, where the wall switches are not only connected to the node that can power the lights.
Control via local and remote wall switches
In the schematic is used a Relay Board rather then an LED, using a Relay Board with an amplifier and external power supply the circuit is quite similar to power an LED. If using an optoinsulated amplified, is just powering an LED that will then give power to the relay coil.
The data flow is similar to Souliss_ex01_HelloWorld but with two light rather than one, more there is one addictional node that can control the light via remote wall switches. So consider to have doubled switches in different location, both controlling the lights.
Lights are controller by node number one and this node care of notification to Android interface.
Control via Android Smartphone or Tablet
Command and feedback are then available on the Android device, with full control of your lights. The status of the lights is always available in the Android (or any other) interface, also if the command is issued from a wall switch or any other control point.
Source : https://code.google.com/p/souliss/wiki/Souliss_ex02_FiatLux
Hey very interesting blog!