 NewPing sonar_1(TRIGGER_PIN_1, ECHO_PIN_1, MAX_DISTANCE);     // NewPing setup of closer sensor.
 NewPing sonar_2(TRIGGER_PIN_2, ECHO_PIN_2, MAX_DISTANCE);     // NewPing setup of farther sensor.
 
-// RGB
-rgb_lcd lcd;
+// RGB_LCD from Adafruit
+Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();
 
 // MADGEWICK
 // see https://www.arduino.cc/en/Tutorial/Genuino101CurieIMUOrientationVisualiser

// Update population and move cursor to where the message will be written
void updatePopulationAndMoveCursor() {
  lcd.setCursor(12, 0);
  lcd.write("    ");
  lcd.setCursor(12, 0);
  lcd.print(population);
  lcd.setCursor(0, 1);
  
  if (debug) {
    Serial.print("Population: ");
  }

void incrementPopulation() {
  population++;
  updatePopulationAndMoveCursor();
  lcd.setCursor(0, 1);
  lcd.print("Welcome!        ");
}

void decrementPopulation() {
