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