接线如图:
代码如下:
const int sensor = 8;
int state; // 0 close - 1 open wwitch
void setup()
{
Serial.begin(9600);
pinMode(sensor, INPUT_PULLUP);
}
void loop()
{
state = digitalRead(sensor);
if (state == HIGH){
Serial.println("aaa");
}
else{
Serial.println("bbb");
}
delay(200);
}
如下所示,两个板子分开时是aaa,合在一起是bbb