Projet Wokwi : Station sans fil avec 2 Arduino Mega 2560 + 2 modules RFM69HCW

COMPOSANTS :
- 2 Arduino Mega 2560 Rev3
- 2 Modules RFM69HCW
- 1 DHT11
- 1 HC-SR04
- 1 MPX4250AP
- 2 PC (Serial Monitor TX/RX)

========================================
ARDUINO EMETTEUR
========================================

DHT11
VCC  -> 5V
GND  -> GND
DATA -> D7

HC-SR04
VCC  -> 5V
GND  -> GND
TRIG -> D8
ECHO -> D9

MPX4250AP
VCC  -> 5V
GND  -> GND
OUT  -> A0

RFM69HCW
MISO -> D50
MOSI -> D51
SCK  -> D52
NSS  -> D53
DIO0 -> D2
GND  -> GND
3.3V -> 3.3V

========================================
ARDUINO RECEPTEUR
========================================

RFM69HCW
MISO -> D50
MOSI -> D51
SCK  -> D52
NSS  -> D53
DIO0 -> D2
GND  -> GND
3.3V -> 3.3V

========================================
FICHIER diagram.json
========================================

{
  "version": 1,
  "author": "ChatGPT",
  "editor": "wokwi",
  "parts": [
    {
      "type": "wokwi-arduino-mega",
      "id": "megaTX",
      "top": -20,
      "left": -250,
      "attrs": {}
    },
    {
      "type": "wokwi-arduino-mega",
      "id": "megaRX",
      "top": -20,
      "left": 350,
      "attrs": {}
    },
    {
      "type": "wokwi-dht11",
      "id": "dht1",
      "top": -220,
      "left": -390,
      "attrs": {}
    },
    {
      "type": "wokwi-hc-sr04",
      "id": "ultra1",
      "top": -220,
      "left": -120,
      "attrs": {}
    },
    {
      "type": "wokwi-potentiometer",
      "id": "pot1",
      "top": -220,
      "left": 90,
      "attrs": {}
    }
  ],
  "connections": [
    [ "dht1:VCC", "megaTX:5V", "red" ],
    [ "dht1:GND", "megaTX:GND.1", "black" ],
    [ "dht1:SDA", "megaTX:7", "green" ],

    [ "ultra1:VCC", "megaTX:5V", "red" ],
    [ "ultra1:GND", "megaTX:GND.1", "black" ],
    [ "ultra1:TRIG", "megaTX:8", "blue" ],
    [ "ultra1:ECHO", "megaTX:9", "green" ],

    [ "pot1:VCC", "megaTX:5V", "red" ],
    [ "pot1:GND", "megaTX:GND.1", "black" ],
    [ "pot1:SIG", "megaTX:A0", "orange" ]
  ]
}

========================================
CODE EMETTEUR
========================================

#include <SPI.h>
#include <RH_RF69.h>
#include <DHT.h>

#define DHTPIN 7
#define DHTTYPE DHT11

#define TRIG_PIN 8
#define ECHO_PIN 9

#define PRESSURE_PIN A0

#define RFM69_CS 53
#define RFM69_INT 2
#define RF69_FREQ 868.0

RH_RF69 rf69(RFM69_CS, RFM69_INT);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);

  dht.begin();

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  rf69.init();
  rf69.setFrequency(RF69_FREQ);
  rf69.setTxPower(20, true);
}

void loop() {

  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);

  digitalWrite(TRIG_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);

  float distance = duration * 0.034 / 2;

  int pressure = analogRead(PRESSURE_PIN);

  String data =
    String(temp) + "," +
    String(hum) + "," +
    String(distance) + "," +
    String(pressure);

  rf69.send((uint8_t*)data.c_str(), data.length());
  rf69.waitPacketSent();

  Serial.println(data);

  delay(2000);
}

========================================
CODE RECEPTEUR
========================================

#include <SPI.h>
#include <RH_RF69.h>

#define RFM69_CS 53
#define RFM69_INT 2
#define RF69_FREQ 868.0

RH_RF69 rf69(RFM69_CS, RFM69_INT);

void setup() {

  Serial.begin(9600);

  rf69.init();
  rf69.setFrequency(RF69_FREQ);
}

void loop() {

  if (rf69.available()) {

    uint8_t buf[RH_RF69_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);

    if (rf69.recv(buf, &len)) {

      Serial.print("Donnees recues : ");

      for (int i = 0; i < len; i++) {
        Serial.print((char)buf[i]);
      }

      Serial.println();
    }
  }
}

========================================
BIBLIOTHEQUES WOKWI
========================================

RadioHead
DHT sensor library

========================================