doorlock-lora-controller.ino

#include <SPI.h>              // include libraries
#include <LoRa.h>

#define btn 3
#define red_led 4
#define green_led 5

//920.9Mhz
const long frequency = 9209E5;

void setup() {
  Serial.begin(9600);                   // initialize serial
  pinMode(btn,INPUT_PULLUP);
  pinMode(red_led,OUTPUT);
  pinMode(green_led,OUTPUT);
  if (!LoRa.begin(frequency)) {
    Serial.println("LoRa init failed. Check your connections.");
    while (true);                       // if failed, do nothing
  }

  Serial.println("LoRa init succeeded.");
  Serial.println();
  Serial.println("LoRa Simple Node");
  Serial.println("Only receive messages from gateways");
  Serial.println("Tx: invertIQ disable");
  Serial.println("Rx: invertIQ enable");
  Serial.println();

  LoRa.onReceive(onReceive);
  LoRa.onTxDone(onTxDone);
  LoRa_rxMode();
}

void loop() {
  if(digitalRead(btn) == LOW){
    //버튼이 눌려졌다!
    LoRa_sendMessage("nockanda");
    digitalWrite(red_led,HIGH);
    digitalWrite(green_led,LOW);
    delay(300);
  }
/*
  //node쪽은 1초에 한번 뭔가 전송하려고 한다~
  if (runEvery(1000)) { // repeat every 1000 millis

    String message = "HeLoRa World! ";
    message += "I'm a Node! ";
    message += millis();

    LoRa_sendMessage(message); // send a message

    Serial.println("Send Message!");
  }
  */
}

void LoRa_rxMode(){
  LoRa.enableInvertIQ();                // active invert I and Q signals
  LoRa.receive();                       // set receive mode
}

void LoRa_txMode(){
  LoRa.idle();                          // set standby mode
  LoRa.disableInvertIQ();               // normal mode
}

void LoRa_sendMessage(String message) {
  LoRa_txMode();                        // set tx mode
  LoRa.beginPacket();                   // start packet
  LoRa.print(message);                  // add payload
  LoRa.endPacket(true);                 // finish packet and send it
}

void onReceive(int packetSize) {
  String message = "";

  while (LoRa.available()) {
    message += (char)LoRa.read();
  }

  if(message == "OK"){
    digitalWrite(red_led,LOW);
    digitalWrite(green_led,HIGH);
  }

  Serial.print("Node Receive: ");
  Serial.println(message);
}

void onTxDone() {
  Serial.println("TxDone");
  LoRa_rxMode();
}

boolean runEvery(unsigned long interval)
{
  static unsigned long previousMillis = 0;
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval)
  {
    previousMillis = currentMillis;
    return true;
  }
  return false;
}