Capacitive touch not working on Bluefruit Playground about adafruit_circuitplayground HOT 2 CLOSED

void loop() {
  for(int i=0;i<7;i++) {
    float val = CircuitPlayground.readCap(i);
    if(val>250) {
      Serial.print("Touched: "); Serial.println(i);
      delay(100);
    }
  }
 }

void loop() {
  CircuitPlayground.speaker.enable(false);
  int caps[] = {6,9,10,3,2,0,1};
  for(int i=0;i<7;i++) {
    float val = CircuitPlayground.readCap(caps[i]);
    if(val>500) {
      Serial.print("Touched: A"); Serial.print(i+1); Serial.print("  Val: "); Serial.println(val);
      delay(100);
    }
  }
 }