arduino sx1278 esp8266 例子

接线

NodeMCU Pins                          SX1278 Pins
GND                                       GND
3.3V                                      VCC
D8                                        NSS
D7                                        MOSI
D6                                        MISO
D5                                        SCK
D0                                        RST
D2                                        DIO0

发送代码

#include <SPI.h>
#include <LoRa.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>
 
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
 
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     LED_BUILTIN // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 
#define DHTPIN 0          //pin where the dht11 is connected
#define ss 15
#define rst 16
#define dio0 2
int counter = 0;
 
DHT dht(DHTPIN, DHT11);
void setup() 
{
  Serial.begin(115200);
  dht.begin();
 
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  while (!Serial);
  Serial.println("LoRa Sender");
  LoRa.setPins(ss, rst, dio0);
    if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    delay(100);
    while (1);
  }
  
  display.display();
  delay(2);
  display.clearDisplay();
}
 
void loop() 
{
  float h = dht.readHumidity();
  float t = dht.readTemperature();
 
  if (isnan(h) || isnan(t)) 
  {
  Serial.println("Failed to read from DHT sensor!");
  return;
  }
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" degrees Celcius, Humidity: ");
  Serial.println(h);
  Serial.println();
  Serial.print("Sending packet: ");
  Serial.println(counter);
 
  display.clearDisplay();
  display.setTextSize(2);             // Normal 1:1 pixel scale
  display.setTextColor(WHITE);        // Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.print(F("Pkt No:"));
  display.print(counter);
  
  display.setCursor(0,20); 
  display.print("Tem:");
  display.print(t);
  display.print("C");
 
  display.setCursor(0,40); 
  display.print("Hum:");
  display.print(h);
  display.print("%");
  display.display();
  
  // send packet
  LoRa.beginPacket();
  LoRa.print(F("Pkt No:"));
  LoRa.println(counter);
  
  LoRa.print("Temp: ");
  LoRa.print(t);
  LoRa.println("°C");
  
  LoRa.print("Hum:  ");
  LoRa.print(h);
  LoRa.print("%");
  LoRa.println("");
  
  LoRa.endPacket();
 
  counter++;
 
  delay(3000);
}

接收器代码

#include <SPI.h>
#include <LoRa.h>
 
#define ss 15
#define rst 16
#define dio0 4
 
void setup() {
  Serial.begin(115200);
  while (!Serial);
 
  Serial.println("LoRa Receiver Callback");
 
  LoRa.setPins(ss, rst, dio0);
 
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
 
  // register the receive callback
  LoRa.onReceive(onReceive);
 
  // put the radio into receive mode
  LoRa.receive();
}
 
void loop() {
  // do nothing
}
 
void onReceive(int packetSize) {
  // received a packet
  Serial.println("Received packet '");
 
  // read packet
  for (int i = 0; i < packetSize; i++) {
    Serial.print((char)LoRa.read());
  }
}

原文地址

https://how2electronics.com/lora-sx1278-esp8266-transmitter-receiver/