int btn1 = 7;
int btn2 = 10;
int btn3 = 9;

void setup() {
  Serial.begin(9600);
  pinMode(7, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  Serial.println("System on!");
  


}

void loop() {
  int btn1_Value = digitalRead(btn1);
  int btn2_Value = digitalRead(btn2);
  int btn3_Value = digitalRead(btn3);
  if(btn1_Value == 0) {
    Serial.println("TRUE");
  }else if (btn2_Value == 0) {
    Serial.println("FALSE");
  }else if(btn3_Value == 0) {
    Serial.println("NEXT");
  }else{
    ;
  }
  delay(1000);

}