Platform: atmelsam
===================================================================
ID                MCU        Frequency Flash RAM  Name
----------------- ---------- --------- ----- ---- -----------------
adafruit_qt_py_m0 SAMD21E18A 48MHz     256KB 32KB Adafruit QT Py M0

[env:adafruit_qt_py_m0]
platform = atmelsam
board = adafruit_qt_py_m0
framework = arduino
platform_packages = toolchain-gccarmnoneeabi @ 1.40803.0
board_build.mcu = samd21e18a
board_build.f_cpu = 48000000L
build_flags = -D SAMD21
upload_protocol = sam-ba

const int SENCER_PIN = A2;
const int LED_PIN    = A3;

boolean status = LOW;

void setup() {
	pinMode(SENCER_PIN,INPUT);
	pinMode(LED_PIN,OUTPUT);
}

void loop() {
	status = digitalRead(SENCER_PIN);
	digitalWrite(LED_PIN,status);
	if(status) {
		// describe code
	}
	delay(500);
}