4 LED strips controlled by 4 push buttons

#include "ZMEButtons.h"
#include "ZUNO_SHIELD.h" // Shield library

#define BTN_1 A0
#define BTN_2 A1
#define BTN_3 A2
#define BTN_4 A3

// Global variables
uint8_t pin0SwitchMultilevelState = 0, _pin0SwitchMultilevelState = 1;
uint8_t pin1SwitchMultilevelState = 0, _pin1SwitchMultilevelState = 1;
uint8_t pin2SwitchMultilevelState = 0, _pin2SwitchMultilevelState = 1;
uint8_t pin3SwitchMultilevelState = 0, _pin3SwitchMultilevelState = 1;

// Z-Wave channels
ZUNO_SETUP_CHANNELS(
  ZUNO_SWITCH_MULTILEVEL(pin0SwitchMultilevelState, NULL),
  ZUNO_SWITCH_MULTILEVEL(pin1SwitchMultilevelState, NULL),
  ZUNO_SWITCH_MULTILEVEL(pin2SwitchMultilevelState, NULL),
  ZUNO_SWITCH_MULTILEVEL(pin3SwitchMultilevelState, NULL)
);

ZUNOShield shield; // Shield object
// Button controllers
// Maps button control to switch multilevel channel
DimmableSwitchBtnController cntrl1(BTN_1, 1, &pin0SwitchMultilevelState);
DimmableSwitchBtnController cntrl2(BTN_2, 2, &pin1SwitchMultilevelState);
DimmableSwitchBtnController cntrl3(BTN_3, 3, &pin2SwitchMultilevelState);
DimmableSwitchBtnController cntrl4(BTN_4, 4, &pin3SwitchMultilevelState);
void setup() {
  pinMode(BTN_1, INPUT);
  pinMode(BTN_2, INPUT);
  pinMode(BTN_3, INPUT);
  pinMode(BTN_4, INPUT);
  cntrl1.begin(ZMEBUTTON_PIN_FLAG_PULL| ZMEBUTTON_PIN_FLAG_FILTER);
  cntrl2.begin(ZMEBUTTON_PIN_FLAG_PULL| ZMEBUTTON_PIN_FLAG_FILTER);
  cntrl3.begin(ZMEBUTTON_PIN_FLAG_PULL| ZMEBUTTON_PIN_FLAG_FILTER);
  cntrl4.begin(ZMEBUTTON_PIN_FLAG_PULL| ZMEBUTTON_PIN_FLAG_FILTER);
  shield.initPWM(PWM_CHANNEL_MASK(PWM1) | PWM_CHANNEL_MASK(PWM2) | PWM_CHANNEL_MASK(PWM3) | PWM_CHANNEL_MASK(PWM4));
}

void loop() {  
  // process button controllers
  cntrl1.process();
  cntrl2.process();
  cntrl3.process();
  cntrl4.process();
  if (pin0SwitchMultilevelState != _pin0SwitchMultilevelState) {
    _pin0SwitchMultilevelState = pin0SwitchMultilevelState;
    shield.writePWMPercentage(PWM_CHANNEL(PWM1), pin0SwitchMultilevelState);
  }

  if (pin1SwitchMultilevelState != _pin1SwitchMultilevelState) {
    _pin1SwitchMultilevelState = pin1SwitchMultilevelState;
    shield.writePWMPercentage(PWM_CHANNEL(PWM2), pin1SwitchMultilevelState);
  }

  if (pin2SwitchMultilevelState != _pin2SwitchMultilevelState) {
    _pin2SwitchMultilevelState = pin2SwitchMultilevelState;
    shield.writePWMPercentage(PWM_CHANNEL(PWM3), pin2SwitchMultilevelState);
  }

  if (pin3SwitchMultilevelState != _pin3SwitchMultilevelState) {
    _pin3SwitchMultilevelState = pin3SwitchMultilevelState;
    shield.writePWMPercentage(PWM_CHANNEL(PWM4), pin3SwitchMultilevelState);
  }
}