Documentation

// T-Beam v1.1 - read NEO-6M GPS and print position
// Libraries: TinyGPSPlus, XPowersLib (both in Library Manager)

#include <TinyGPSPlus.h>
#include <Wire.h>
#include <XPowersLib.h>

TinyGPSPlus gps;
XPowersAXP192 pmu;   // v1.2 boards: use XPowersAXP2101 instead

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

  // 1) Wake the PMU and switch on the GPS power rail (LDO3, 3.3V)
  Wire.begin(21, 22);
  pmu.begin(Wire, AXP192_SLAVE_ADDRESS, 21, 22);
  pmu.setLDO3Voltage(3300);
  pmu.enableLDO3();

  // 2) GPS UART: RX=34, TX=12, 9600 baud
  Serial1.begin(9600, SERIAL_8N1, 34, 12);
  Serial.println("Waiting for GPS fix (go outdoors)...");
}

void loop() {
  while (Serial1.available()) {
    gps.encode(Serial1.read());
  }
  if (gps.location.isUpdated()) {
    Serial.print("Lat: ");  Serial.print(gps.location.lat(), 6);
    Serial.print("  Lng: "); Serial.print(gps.location.lng(), 6);
    Serial.print("  Sats: "); Serial.println(gps.satellites.value());
  }
}

// T-Beam (SX1276 revision) - send a LoRa packet every 5 seconds
// Library: "LoRa" by Sandeep Mistry. SX1262 boards: use RadioLib instead.
// ANTENNA MUST BE ATTACHED BEFORE POWERING THE BOARD.

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

const long FREQ = 915E6;   // 915 MHz (US band)
int counter = 0;

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

  SPI.begin(5, 19, 27, 18);        // SCK, MISO, MOSI, NSS
  LoRa.setPins(18, 23, 26);        // NSS, RST, DIO0

  if (!LoRa.begin(FREQ)) {
    Serial.println("LoRa init failed - check antenna and revision");
    while (true) delay(1000);
  }
  Serial.println("LoRa ready");
}

void loop() {
  LoRa.beginPacket();
  LoRa.print("T-Beam beacon #");
  LoRa.print(counter++);
  LoRa.endPacket();

  Serial.println("Packet sent");
  delay(5000);
}