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Lora Gateway Based on MicroPython ESP32

Using two LoRa nodes to send the temperature and humidity data to the gateway, and then upload it to the Internet through the gateway.

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Lora Gateway Based on MicroPython ESP32

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Code

TransmitterDHT11.ino

Arduino
TransmitterDHT11.ino
// LoRa 9x_TX
// -*- mode: C++ -*-
// Example sketch showing how to create a simple messaging client (transmitter)
// with the RH_RF95 class. RH_RF95 class does not provide for addressing or
// reliability, so you should only use RH_RF95 if you do not need the higher
// level messaging abilities.
// It is designed to work with the other example LoRa9x_RX

//Function:Transmit DHT11 to Lora
//Author: Charlin
//Date:2019/12/11

#include <SPI.h>
#include "RH_RF95.h"
#include "DHT.h"
#define DHTPIN 4     // Digital pin connected to the DHT sensor
#include "avr/boot.h"

// Uncomment whatever type you're using!m
#define DHTTYPE DHT11   // DHT 11
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

#define RFM95_CS 10
#define RFM95_RST 9
#define RFM95_INT 2

// Change to 434.0 or other frequency, must match RX's freq!
#define RF95_FREQ 433.0

// Singleton instance of the radio driver
RH_RF95 rf95(RFM95_CS, RFM95_INT);

void setup() 
{
  pinMode(RFM95_RST, OUTPUT);
  digitalWrite(RFM95_RST, HIGH);

  
  while (!Serial);
  Serial.begin(9600);
  delay(100);

  Serial.println("Marduino LoRa TX Test!");

  // manual reset
  digitalWrite(RFM95_RST, LOW);
  delay(10);
  digitalWrite(RFM95_RST, HIGH);
  delay(10);

  while (!rf95.init()) {
    Serial.println("LoRa radio init failed");
    while (1);
  }
  Serial.println("LoRa radio init OK!");

  // Defaults after init are 434.0MHz, modulation GFSK_Rb250Fd250, +13dbM
  if (!rf95.setFrequency(RF95_FREQ)) {
    Serial.println("setFrequency failed");
    while (1);
  }
  Serial.print("Set Freq to: "); Serial.println(RF95_FREQ);
  
  // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on

  // The default transmitter power is 13dBm, using PA_BOOST.
  // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then 
  // you can set transmitter powers from 5 to 23 dBm:
  rf95.setTxPower(23, false);

  dht.begin();
}

int16_t packetnum = 0;  // packet counter, we increment per xmission
int16_t nodenum = 1;    //node number

void loop()
{

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float humidity = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float temperature = dht.readTemperature();

    // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    //return;
  }

  //Serial.print(F("Humidity: "));
  //Serial.print(humidity);
  //Serial.print(F("%  Temperature: "));
  //Serial.print(temperature);
  //Serial.println("Humidity is " + (String)humidity);
  //Serial.println("Temperature is " + (String)temperature);

  //String message = "#"+(String)packetnum+" Humidity:"+(String)humidity+"% Temperature:"+(String)temperature+"C";
  String message ="#"+(String)nodenum+" Humidity:"+(String)humidity+"% Temperature:"+(String)temperature+"C"+" num:"+(String)packetnum;
  Serial.println(message);
  packetnum++;
  Serial.println("Transmit: Sending to rf95_server");


  //Serial.println("UID Bytes:");
  //for (int i = 14; i < 14 + 10; i++)
  //{
  //  Serial.print(boot_signature_byte_get(i), HEX);
  //}
  //Serial.println("");
  
  // Send a message to rf95_server
  uint8_t radioPacket[message.length()+1];
  message.toCharArray(radioPacket, message.length()+1);
  radioPacket[message.length()+1]= '\0';
  Serial.println("Sending..."); delay(10);
  rf95.send((uint8_t *)radioPacket, message.length()+1); 
  
  Serial.println("Waiting for packet to complete..."); delay(10);
  rf95.waitPacketSent();
  // Now wait for a reply
  uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);

  Serial.println("Waiting for reply..."); delay(10);
  if (rf95.waitAvailableTimeout(2000))
  { 
    // Should be a reply message for us now   
    if (rf95.recv(buf, &len))
   {
      Serial.print("Got reply: ");
      Serial.println((char*)buf);
      Serial.print("RSSI: ");
      Serial.println(rf95.lastRssi(), DEC);    
    }
    else
    {
      Serial.println("Receive failed");
    }
  }
  else
  {
    Serial.println("No reply, is there a listener around?");
  }
  
  Serial.println("");
  
  //delay(1000);
}

Credits

Makerfabs-He

Makerfabs-He

12 projects • 9 followers
Makerfabs - IoT/ Open Source Hardware/ PCBA

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