arduino/Examples/LoRaTests/lib/arduino-LoRa/examples/LoRaSetSpread/LoRaSetSpread.ino

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2019-06-21 16:12:29 +00:00
/*
LoRa Duplex communication with Spreading Factor
Sends a message every half second, and polls continually
for new incoming messages. Sets the LoRa radio's spreading factor.
Spreading factor affects how far apart the radio's transmissions
are, across the available bandwidth. Radios with different spreading
factors will not receive each other's transmissions. This is one way you
can filter out radios you want to ignore, without making an addressing scheme.
Spreading factor affects reliability of transmission at high rates, however,
so avoid a hugh spreading factor when you're sending continually.
See the Semtech datasheet, http://www.semtech.com/images/datasheet/sx1276.pdf
for more on Spreading Factor.
created 28 April 2017
by Tom Igoe
*/
#include <SPI.h> // include libraries
#include <LoRa.h>
const int csPin = 7; // LoRa radio chip select
const int resetPin = 6; // LoRa radio reset
const int irqPin = 1; // change for your board; must be a hardware interrupt pin
byte msgCount = 0; // count of outgoing messages
int interval = 2000; // interval between sends
long lastSendTime = 0; // time of last packet send
void setup() {
Serial.begin(9600); // initialize serial
while (!Serial);
Serial.println("LoRa Duplex - Set spreading factor");
// override the default CS, reset, and IRQ pins (optional)
LoRa.setPins(csPin, resetPin, irqPin); // set CS, reset, IRQ pin
if (!LoRa.begin(915E6)) { // initialize ratio at 915 MHz
Serial.println("LoRa init failed. Check your connections.");
while (true); // if failed, do nothing
}
LoRa.setSpreadingFactor(8); // ranges from 6-12,default 7 see API docs
Serial.println("LoRa init succeeded.");
}
void loop() {
if (millis() - lastSendTime > interval) {
String message = "HeLoRa World! "; // send a message
message += msgCount;
sendMessage(message);
Serial.println("Sending " + message);
lastSendTime = millis(); // timestamp the message
interval = random(2000) + 1000; // 2-3 seconds
msgCount++;
}
// parse for a packet, and call onReceive with the result:
onReceive(LoRa.parsePacket());
}
void sendMessage(String outgoing) {
LoRa.beginPacket(); // start packet
LoRa.print(outgoing); // add payload
LoRa.endPacket(); // finish packet and send it
msgCount++; // increment message ID
}
void onReceive(int packetSize) {
if (packetSize == 0) return; // if there's no packet, return
// read packet header bytes:
String incoming = "";
while (LoRa.available()) {
incoming += (char)LoRa.read();
}
Serial.println("Message: " + incoming);
Serial.println("RSSI: " + String(LoRa.packetRssi()));
Serial.println("Snr: " + String(LoRa.packetSnr()));
Serial.println();
}