https://item.taobao.com/item.htm?spm=a1z09.2.0.0.5fc02e8dncAF2p&id=604968021102&_u=i1qf7bf5f4ec
void sendMeg()
{
Serial.println("AT");
delay(2000);
Serial.println("AT+CMGF=1");
delay(2000);
Serial.println("AT+CMGS=\"PHONENUMBER\"");//这里改成你的号码
delay(2000);
Serial.print("Test\r\n");//这里写内容
delay(2000);
Serial.write(0x1A); //原来这里我是“Serial.print(0x1A);”，一直调不出来，后来改了才成功了，那酸爽
}
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
}
void loop() {
// put your main code here, to run repeatedly:
delay(15*1000);
sendMeg();
}