bool y;void setup() { pinMode(7, INPUT_PULLUP); pinMode(13, OUTPUT); Serial.begin(9600);}
void loop() { if(digitalRead(7)==LOW){ digitalWrite(13, HIGH); if(y){ Serial.print("start"); delay(500); y=LOW; }
} else{ y=HIGH; digitalWrite(13, LOW);
}
}
我是这样的的,7脚每接通一次发一个“start"