...
The sender code sends a simple message, with a delay of 5 seconds. Make sure you change the contents of myData.
| Code Block |
|---|
|
#include <SPI.h>
#include <LoRa.h>
int counter = 0;
String myData = "my name";
void setup() {
Serial.begin(9600);// wait until serial has started
Serial.println("LoRa Sender");
if (!LoRa.begin(868E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}
delay(1000);
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
Serial.print("Sending packet: ");
Serial.println(counter);
// send packet
LoRa.beginPacket();
LoRa.print(myData);
LoRa.endPacket();
counter++;
digitalWrite(LED_BUILTIN, HIGH);
delay(1000);
digitalWrite(LED_BUILTIN, LOW);
delay(4000);
} |
Receiver Code
| Code Block |
|---|
|
#include <SPI.h>
#include <LoRa.h>
String contents = "";
void setup() {
Serial.begin(9600);
while (!Serial); // wait until serial has started
Serial.println("LoRa Receiver");
if (!LoRa.begin(868E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}
}
void loop() {
// try to parse packet
int packetSize = LoRa.parsePacket();
if (packetSize) {
// received a packet
Serial.print("Received packet '");
// read packet
while (LoRa.available()) {
contents += (char)LoRa.read();
}
Serial.println(contents);
// print RSSI of packet
Serial.print("' with RSSI ");
Serial.println(LoRa.packetRssi());
contents = "";
}
} |
...
Sender Code with an Analog Sensor.
| Code Block |
|---|
|
#include <SPI.h>
#include <LoRa.h>
int counter = 0;
String myUniqueId = "asdfw1";
void setup() {
Serial.begin(9600);
while (!Serial);
Serial.println("LoRa Sender");
if (!LoRa.begin(868E6)) {
Serial.println("Starting LoRa failed!");
while(1);
}
delay(1000);
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
int sensorValue = analogRead(A0);
Serial.print("Sending packet: ");
Serial.println(counter);
// send packet
LoRa.beginPacket();
LoRa.print(sensorValue);
LoRa.print(",");
LoRa.print(myUniqueId);
LoRa.endPacket();
counter++;
digitalWrite(LED_BUILTIN, HIGH);
delay(1000);
digitalWrite(LED_BUILTIN, LOW);
delay(4000);
} |
Receiver Code
| Code Block |
|---|
|
#include <SPI.h>
#include <LoRa.h>
String contents = "";
String myUniqueId = "asdfw1";
void setup() {
Serial.begin(9600);
while (!Serial);
Serial.println("LoRa Receiver");
if (!LoRa.begin(868E6)) {
Serial.println("Starting LoRa failed!");
while (1);
}
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
// try to parse packet
int packetSize = LoRa.parsePacket();
if (packetSize) {
// received a packet
Serial.print("Received packet '");
// read packet
while (LoRa.available()) {
contents += (char)LoRa.read();
}
Serial.println(contents);
// print RSSI of packet (Received Signal Strength Indicator)
Serial.print("' with RSSI ");
Serial.println(LoRa.packetRssi());
int commaIndex = contents.indexOf(',');
String data = contents.substring(0, commaIndex);
String ID = contents.substring(commaIndex + 1);
if (data && ID) {
Serial.println("Recieved Matching format");
if (ID.equals(myUniqueId)) {
Serial.println("ID matches!");
digitalWrite(LED_BUILTIN, HIGH);
Serial.print("data: ");
Serial.println(data);
} else {
Serial.print(myUniqueId);
Serial.print(" does not match ");
Serial.println(ID);
digitalWrite(LED_BUILTIN, LOW);
}
}
contents = "";
}
} |
If you want to send more than one piece of data at a time, you will need to parse multiple comma-separated values. This code snippet below shows how this can be done using the substring() and indexOf() methods of the String object.
| Code Block |
|---|
|
// This can get confusing as you send more data. It can be helpful to write out your expected string and note where the indexes are.
// data1,data2,uniqueId
// ↑ ↑
// IndexA IndexB
int IndexA = contents.indexOf(','); //finds location of first item
String data1 = contents.substring(0, IndexA);
int IndexB = contents.indexOf(',', IndexA + 1 ); //finds location of 2nd item
String data2 = contents.substring(IndexA + 1, IndexB);
String ID = contents.substring(IndexB + 1);
if (ID.equals(myUniqueId)) {
Serial.println("ID matches!");
digitalWrite(LED_BUILTIN, HIGH);
Serial.print("data1: ");
Serial.println(data1);
Serial.print("data2: ");
Serial.println(data2);
Serial.println();
} |