This code runs the motions sensor and RGB LEDs so that the lights are blue when no motion. When motion is detected the LEDs will flash green and it will send the signal to the other arduino to play a coin sound.

Lights-and-Motion.ino

int pirPin = 10;
int redLED = A4;
int greenLED = A2;
int blueLED = A3;
int coinSound= 7;

void setup() {
  Serial.begin(9600);
  pinMode(pirPin, INPUT);
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);
  pinMode(coinSound, OUTPUT);
}

void loop() {
  int pirVal = digitalRead(pirPin);
  
  if(pirVal == LOW) {
     Serial.println("Motion Detected");
     //delay(1500);
     analogWrite(blueLED, 0);
     analogWrite(greenLED, 1023);
     delay(1500);
     digitalWrite(coinSound, HIGH);
  }
  else {
      Serial.println("None");
      analogWrite(greenLED, 0);
      analogWrite(blueLED, 1023);
      //analogWrite(blueLED, 0);
      digitalWrite(coinSound,LOW);
  }
}