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Buy this sensor or kit.

Tilt switch module and a digital interface, built-in LED build a simple circuit to produce tilt warning lamp comes with digital interfaces of the LED, the tilt switch sensor interface to access digital 3, when the tilt open Off sensor senses a key signal, LED lights, otherwise off.

Example code

int Led = 13 ;// define LED Interface
int buttonpin = 3; // define the tilt switch sensor interfaces
int val ;// define numeric variables val
void setup ()
{
  pinMode (Led, OUTPUT) ;// define LED as output interface
    pinMode (buttonpin, INPUT) ;//define the output interface tilt switch sensor
}
void loop ()
{
  val = digitalRead (buttonpin) ;// digital interface will be assigned a value of 3 to read val
    if (val == HIGH) //When the tilt sensor detects a signal when the switch, LED flashes
  {
    digitalWrite (Led, HIGH);
  }
  else
  {
    digitalWrite (Led, LOW);
  }
}