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Lora Gateway Based On Micropython Esp32

About the project

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

Project info

Difficulty: Moderate

Platforms: Arduino, Python

Estimated time: 3 hours

License: GNU General Public License, version 3 or later (GPL3+)

Story

Lora has been very popular in recent years. The wireless communication module using this technology is usually cheap (using free spectrum), small in size, energy-efficient and has a long communication distance, and is mainly used for mutual communication between IoT terminals or data exchange with a host. There are many LoRa modules on the market, such as RFM96W, which is equipped with SX1278 (compatible) chip, which is very small. I use it with MakePython ESP32 as a gateway.

Next, I will use two LoRa nodes to send the temperature and humidity data to the gateway, and then upload it to the Internet through the gateway. Here you will learn how to upload remote data of multiple LoRa nodes to the cloud through the gateway.

Step 1: Supplies

Project Suppliers

1*MakePython ESP32

2*Maduino Lora Radio

2*DHT11

1*MakePython Lora

MakePython ESP32 is an ESP32 board with an integrated SSD1306 OLED display.

Maduino Lora Radio is an IoT (Internet of things) Solution based on Atmel’s Atmega328P MCU and Lora module. It can be a real project for IoT projects(especially long-range, low power application )

Step 2: LoRa Node

Schematic of Maduino Lora Radio

Maduino Lora

Arduino Lora Radio module as LoRa node, we use it to send temperature and humidity data to the gateway.

(This Wiki introduces how to use Maduno Lora Radio and send and receive data)

Step 3: Node and Sensor Connection

Node and sensor connection

Testing

The VCC and GND of DHT11 are connected to 3V3 and GND of Maduino, and the DATA pin is connected to D4 of Maduino.

Node 0 is in the park, node 1 is in the office building near the company, they are about 2 kilometers apart, and then I get their temperature and humidity data at home.

Step 4: Send Data to the Gateway

Download TransmitterDHT11.ino, open it on Arduino IDE.

When adding a node, modify the node number accordingly. For example, now use 2 nodes, the first node to modify the nodenum = 0 to run the program, the second node to modify the nodenum = 1 to run the program, and so on, you can add more node.

int16_t packetnum = 0;  // packet counter, we increment per xmissionint16_t nodenum = 0;    //Modify the node number

Collect data and print it

String message ="#"+(String)nodenum+" Humidity:"+(String)humidity+"% Temperature:"+(String)temperature+"C"+" num:"+(String)packetnum;<br>Serial.println(message);packetnum++;

Send a message to rf95_server

uint8_t radioPacket[message.length()+1];message.toCharArray(radioPacket, message.length()+1);radioPacket[message.length()+1]= '

Code

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

Makerfabs01

Makerfabs, Turnkey PCB Assemblies | Small Batch PCBA Prototyping | IoT Hardware Engineering.

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Lora Gateway Based On Micropython Esp32

About the project

Project info

Story

Step 1: Supplies

Step 2: LoRa Node

Step 3: Node and Sensor Connection

Step 4: Send Data to the Gateway

Code

TransmitterDHT11.ino

Credits

Makerfabs01

Leave your feedback...

Shop

Project Hub

Video

Blog

Shop home

3D printing

Single Board Computers

Development kits

Sensors

Internet of things

Robotics

Accessories

Product of the Week

Electromaker Educator

The Electromaker Show

The Electromaker Podcast

Lora Gateway Based On Micropython Esp32

About the project

Project info

Story

Step 1: Supplies

Step 2: LoRa Node

Step 3: Node and Sensor Connection

Step 4: Send Data to the Gateway

Code

TransmitterDHT11.ino

Credits

Makerfabs01

Leave your feedback...

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