const byte Btn1=2;
const byte Btn2=3;
volatile int N1,N2,res;
volatile byte changeN1;
volatile byte changeN2;
void setup() {
  Serial.begin(115200);
  Serial.println("start");
  pinMode(Btn1, INPUT_PULLUP);
  pinMode(Btn2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(Btn1),GetN1 , RISING);
  attachInterrupt(digitalPinToInterrupt(Btn2),GetN2 , FALLING);
  N1=0;
  N2=0;
}

void loop() {
if (changeN1==1) 
{N1=analogRead(A0);
res=N1+N2;
Serial.println(res);
changeN1=0;
}
if (changeN2==1) 
{N2=analogRead(A1);
res=N1+N2;
Serial.println(res);
changeN2=0;
}
}

void GetN1()
{
  changeN1=1;
}

void GetN2()
{
  changeN2=1;
}