Send Scan Data to the ground using Lora 915 #16

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2026-10-05T05:58:54+02:00

adam commented

2026-10-05 05:58:54 +02:00

Send data: pair freq, rssi, max value 3 digits, rssi can even be 2 digits after some transformation like RSSI - 50 to save bandwidth:

#include <SPI.h>
#include <RadioLib.h>

// Initialize LoRa with frequency 915 MHz
SX1276 radio = new Module(10, 2, 9, 3); // (CS, DIO0, RESET, DIO1)

// Binary data array
uint16_t dataToSend[] = {915, 78, 920, 120}; // Your data
size_t dataSize = sizeof(dataToSend) / sizeof(dataToSend[0]);

void setup() {
Serial.begin(115200);
while (!Serial);

Serial.println("Initializing LoRa...");

// Initialize RadioLib with 915 MHz
if (radio.begin(915.0) == RADIOLIB_ERR_NONE) {
Serial.println("LoRa initialized successfully!");
} else {
Serial.println("Failed to initialize LoRa!");
while (true);
}
}

void loop() {
Serial.println("Sending binary data...");

// Convert and send binary data
for (size_t i = 0; i < dataSize; i++) {
uint16_t value = dataToSend[i];
byte binaryData[2];

// Split 16-bit integer into two 8-bit bytes
binaryData[0] = highByte(value);
binaryData[1] = lowByte(value);

// Transmit the binary data
int state = radio.transmit(binaryData, 2); // Send 2 bytes per value

if (state == RADIOLIB_ERR_NONE) {
  Serial.print("Data sent: ");
  Serial.println(value);
} else {
  Serial.print("Failed to send data: ");
  Serial.println(state);
}

delay(1000); // Delay 1 second between sends

}

delay(5000); // Send all data every 5 seconds
}

Receiver

#include <SPI.h>
#include <RadioLib.h>

// Initialize LoRa with frequency 915 MHz
SX1276 radio = new Module(10, 2, 9, 3); // (CS, DIO0, RESET, DIO1)

void setup() {
Serial.begin(115200);
while (!Serial);

Serial.println("Initializing LoRa...");

if (radio.begin(915.0) == RADIOLIB_ERR_NONE) {
Serial.println("LoRa initialized successfully!");
} else {
Serial.println("Failed to initialize LoRa!");
while (true);
}
}

void loop() {
Serial.println("Waiting for binary data...");

byte receivedData[2];
int state = radio.receive(receivedData, 2); // Receive 2 bytes

if (state == RADIOLIB_ERR_NONE) {
// Reconstruct 16-bit integer
uint16_t receivedValue = (receivedData[0] << 8) | receivedData[1];
Serial.print("Received Value: ");
Serial.println(receivedValue);
} else {
Serial.print("Receive failed: ");
Serial.println(state);
}

delay(1000); // Check for new data every 1 second
}

Send data: pair freq, rssi, max value 3 digits, rssi can even be 2 digits after some transformation like RSSI - 50 to save bandwidth: #include <SPI.h> #include <RadioLib.h> // Initialize LoRa with frequency 915 MHz SX1276 radio = new Module(10, 2, 9, 3); // (CS, DIO0, RESET, DIO1) // Binary data array uint16_t dataToSend[] = {915, 78, 920, 120}; // Your data size_t dataSize = sizeof(dataToSend) / sizeof(dataToSend[0]); void setup() { Serial.begin(115200); while (!Serial); Serial.println("Initializing LoRa..."); // Initialize RadioLib with 915 MHz if (radio.begin(915.0) == RADIOLIB_ERR_NONE) { Serial.println("LoRa initialized successfully!"); } else { Serial.println("Failed to initialize LoRa!"); while (true); } } void loop() { Serial.println("Sending binary data..."); // Convert and send binary data for (size_t i = 0; i < dataSize; i++) { uint16_t value = dataToSend[i]; byte binaryData[2]; // Split 16-bit integer into two 8-bit bytes binaryData[0] = highByte(value); binaryData[1] = lowByte(value); // Transmit the binary data int state = radio.transmit(binaryData, 2); // Send 2 bytes per value if (state == RADIOLIB_ERR_NONE) { Serial.print("Data sent: "); Serial.println(value); } else { Serial.print("Failed to send data: "); Serial.println(state); } delay(1000); // Delay 1 second between sends } delay(5000); // Send all data every 5 seconds } Receiver #include <SPI.h> #include <RadioLib.h> // Initialize LoRa with frequency 915 MHz SX1276 radio = new Module(10, 2, 9, 3); // (CS, DIO0, RESET, DIO1) void setup() { Serial.begin(115200); while (!Serial); Serial.println("Initializing LoRa..."); if (radio.begin(915.0) == RADIOLIB_ERR_NONE) { Serial.println("LoRa initialized successfully!"); } else { Serial.println("Failed to initialize LoRa!"); while (true); } } void loop() { Serial.println("Waiting for binary data..."); byte receivedData[2]; int state = radio.receive(receivedData, 2); // Receive 2 bytes if (state == RADIOLIB_ERR_NONE) { // Reconstruct 16-bit integer uint16_t receivedValue = (receivedData[0] << 8) | receivedData[1]; Serial.print("Received Value: "); Serial.println(receivedValue); } else { Serial.print("Receive failed: "); Serial.println(state); } delay(1000); // Check for new data every 1 second }

adam commented

2026-10-05 05:58:55 +02:00

Need things like: max air time per transmission

Need things like: max air time per transmission

adam commented

2026-10-05 05:58:56 +02:00

https://kongduino.github.io/Lora-Calculations/? and https://unsigned.io/understanding-lora-parameters/ to pick LoRa parameters

https://kongduino.github.io/Lora-Calculations/? and https://unsigned.io/understanding-lora-parameters/ to pick LoRa parameters

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Reference: adam/LoraSA#16