Arduino Uno Digital to Analog Converter
Try commenting out the serial in your sketch. In my experience serial communication takes time, and I assume you have a short window where the voltage peaks at more than a volt. Or initialize the serial with a stupidly high baud rate.
Edit: even better, you could try this for a faster response time:

void setup(){
  digitalWrite(13,0);
  pinMode(13, OUTPUT);
}

void loop(){
  if(analogRead(A0)&gt;204){ //at ~1V the ADC will read between 204 and 205
    digitalWrite(13,1);
    delay(100);
    digitalWrite(13,0);
  }
}