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