ถ้าจะทำให้กดสวิตค้างเเเต่ให้ขึ้นข้อความเเจ้งไลน์เเค่ครั้งเดียว ต้องทำไงหรอครับ

#include <TridentTD_LineNotify.h>

#define SSID "3bbhome use 2.4Ghz"
#define PASSWORD "0945574335"
#define LINE_TOKEN "LpQissqB9hacZXGkNnBRr1qTH8ZWAQkEj7bsoHWPJ66"

#define SW D2;
String message = "Messeage to LINE";

void setup() {
Serial.begin(115200); Serial.println();
Serial.println(LINE.getVersion());
pinMode(D2, INPUT);
pinMode(LED_BUILTIN, OUTPUT);

WiFi.begin(SSID, PASSWORD);
Serial.printf("WiFi connecting to", SSID);
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(400);
}
Serial.printf("WiFi connected");
Serial.println(WiFi.localIP());

LINE.setToken(LINE_TOKEN);
LINE.notify("start Line notify");

Serial.println("Start project");
}
void loop() {
byte val = digitalRead(D2);
if (val == HIGH) {
digitalWrite(LED_BUILTIN, LOW);
Serial.println("LED Turned ON");

}
else {
digitalWrite(LED_BUILTIN, HIGH);
}
}