Vitaliy Yurkin, Z-Wave.Me Control 4 power switches from one Z-Uno device. It can be extended to more switches.
  • Z-Uno board
  • Breadboard
  • 4 resistors 220 Ω
  • 4 optocouplers
Download Fritzing project
            /* 
 * 
 * 4 Relays controlled thouth resistors 220Omh and optocouplers 817С
 * Off - HIGH
 * On - LOW
 */

// Pins definitions
#define LedPin1 9
#define LedPin2 10
#define LedPin3 11
#define LedPin4 12

// Global variables to store data reported via getters
byte switchValue1 = 1;
byte switchValue2 = 1;
byte switchValue3 = 1;
byte switchValue4 = 1;

ZUNO_SETUP_SLEEPING_MODE(ZUNO_SLEEPING_MODE_ALWAYS_AWAKE);

// Set up 10 channels
ZUNO_SETUP_CHANNELS(
  ZUNO_SWITCH_BINARY(getterSwitch1, setterSwitch1),
  ZUNO_SWITCH_BINARY(getterSwitch2, setterSwitch2),
  ZUNO_SWITCH_BINARY(getterSwitch3, setterSwitch3),
  ZUNO_SWITCH_BINARY(getterSwitch4, setterSwitch4)
);

void setup() {
  // set up I/O pins. Analog and PWM will be automatically set up on analogRead/analogWrite functions call
  pinMode(LedPin1, OUTPUT);
  pinMode(LedPin2, OUTPUT);
  pinMode(LedPin3, OUTPUT);
  pinMode(LedPin4, OUTPUT);
}

void loop() {
  // Empty
}

// Getters and setters

void setterSwitch1(byte value) {
  digitalWrite(LedPin1, (value > 0) ? LOW : HIGH);
  switchValue1 = value;
}

byte getterSwitch1(){
  return switchValue1;
}

 void setterSwitch2(byte value) {
  digitalWrite(LedPin2, (value > 0) ? LOW : HIGH);
  switchValue2 = value;
}

byte getterSwitch2(){
  return switchValue2;
}

void setterSwitch3(byte value) {
  digitalWrite(LedPin3, (value > 0) ? LOW : HIGH);
  switchValue3 = value;
}

byte getterSwitch3(){
  return switchValue3;
}

void setterSwitch4(byte value) {
  digitalWrite(LedPin4, (value > 0) ? LOW : HIGH);
  switchValue4 = value;
}

byte getterSwitch4(){
  return switchValue4;
}
Download this sketch
Link to detailed project description (in Russian, use Google to translate)