Rs-485 not working when more than two devices

Using Arduino Networking, Protocols, and Devices
1

hi, i'm having trouble using rs-485. It works perfectly fine when I only use 1 slave but as soon as i try to add another one, it only works half of the time. Could someone indicate where is my problem or if there is an easier way to do this ?

rs-485 Master code :

 digitalWrite(Enable, HIGH);

  Serial1.print("I");
  Serial1.print("11"); // slave id
  Serial1.print("L");
  Serial1.print("F");
  Serial1.flush();

  digitalWrite(Enable, LOW);

  delay(15);

  if (Serial1.find("i")) {
    delay(10);
    if (Serial1.read() == '1') {
      th6 = Serial1.parseInt();
      if (Serial1.read() == 'a') {
        tath6 = Serial1.parseFloat();
        if (Serial1.read() == 'p') {
          tpth6 = Serial1.parseFloat();
          if (Serial1.read() == 'f') {
          }
        }
      }
    }
  }

  digitalWrite(Enable, HIGH);

  Serial1.print("I");
  Serial1.print("16"); // slave id
  Serial1.print("L");
  Serial1.print("F");
  Serial1.flush();

  digitalWrite(Enable, LOW);

  delay(15);

  if (Serial1.find("i")) {
    delay(10);
    if (Serial1.read() == '6') {
      th6 = Serial1.parseInt();
      if (Serial1.read() == 'a') {
        tath6 = Serial1.parseFloat();
        if (Serial1.read() == 'p') {
          tpth6 = Serial1.parseFloat();
          if (Serial1.read() == 'f') {
          }
        }
      }
    }
  }

Rs-485 Slave code (both the same exept for the id) :

  if (Serial1.available())
  {
    if (Serial1.read() == 'I')
    {
      int Slave1 = Serial1.parseInt();
      if (Slave1 == Sl1)
      {
        char command = Serial1.read();
        if (command == 'L')
        {
          if (Serial1.read() == 'F')
          {

            digitalWrite(Enable, HIGH);

            Serial1.print("i");
            Serial1.print("6");
            Serial1.print(th1);
            Serial1.print("a");
            Serial1.print(tath);
            Serial1.print("p");
            Serial1.print(tpth);
            Serial1.print("f");
            Serial1.flush();

            digitalWrite(Enable, LOW);
          }
        }
      }
    }
  }

  tath = sensors.getTempC(S1);
  tpth = sensors.getTempC(S2);
  delay(10);
}

Thanks for any help you can provide :smile:

2

Welcome to the forum, and thanks for using code tags on your first post (a rare event)!

We need more information: please post ALL the code, not a snippet, and post a wiring diagram showing the details of how you wired the RS485 adapters.

it only works half of the time.

I have no idea what that means. When the program runs, describe what you expected to happen, and what happened instead.

1 Like
3

it doesn't receive the data. when i only use one of them, it updates each 5 secondes or so but when i use another one, it takes up to 2-3 minutes between each updates. it sometimes doesn't receive it at all.

heres the full code :smile:

Master code :

#include <LiquidCrystal_I2C.h>
#include <DallasTemperature.h>
#include <OneWire.h>
#include <Wire.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

#define ONE_WIRE_BUS 4

OneWire oneWire (ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

DeviceAddress RG1 = { 0x28, 0x5D, 0x72, 0x95, 0xF0, 0x01, 0x3C, 0xA0 };
DeviceAddress RG2 = { 0x28, 0x85, 0xF7, 0x95, 0xF0, 0x01, 0x3C, 0xDC };
DeviceAddress RG3 = { 0x28, 0xD0, 0x1D, 0x95, 0xF0, 0x01, 0x3C, 0x7E };
DeviceAddress RD1 = { 0x28, 0xB3, 0xE7, 0x95, 0xF0, 0x01, 0x3C, 0xFF };
DeviceAddress RD2 = { 0x28, 0x02, 0x4A, 0x95, 0xF0, 0x01, 0x3C, 0x10 };
DeviceAddress RD3 = { 0x28, 0xC1, 0x17, 0x95, 0xF0, 0x01, 0x3C, 0xAF };
int flowpin = 3;

unsigned long currentmillis;
unsigned long lastMillisScroll;

unsigned long currentMillis1;
unsigned long currentMillis2;
unsigned long currentMillis3;
unsigned long currentMillis4;

unsigned long lastMillis1;
unsigned long lastMillis2;
unsigned long lastMillis3;
unsigned long lastMillis4;

double flowRate;
volatile int count;

int menu = 1;

boolean th1 = 0; //Chambre mik
float tath1 = 0;//
float tpth1 = 0;//

boolean th2 = 0; //Chambre bibi
float tath2 = 0;//
float tpth2 = 0;//

boolean th3 = 0; //Chambre will
float tath3 = 0;//
float tpth3 = 0;//

boolean th4 = 0; //Chambre Jade
float tath4 = 0;//
float tpth4 = 0;//

boolean th5 = 0; //sal de bain du sous-sol
float tath5 = 0;//
float tpth5 = 0;//

boolean th6 = 0; //Entrée + sal de lavage
float tath6 = 0;//
float tpth6 = 0;//

boolean th7 = 0; //Bureau de cyndie
float tath7 = 0;//
float tpth7 = 0;//

boolean th8 = 0; //Chambre des maitres
float tath8 = 0;//
float tpth8 = 0;//

boolean th9 = 0; //Walking des maitres
float tath9 = 0;//
float tpth9 = 0;//

boolean th10 = 0; //sal de bain des maitres
float tath10 = 0;//
float tpth10 = 0;//

boolean th11 = 0; //Salle de bain
float tath11 = 0;//
float tpth11 = 0;//

boolean th12 = 0; //2eme etage
float tath12 = 0;//
float tpth12 = 0;//

int p1 = 46; //spa
int p2 = 48; //eaux chaudes
int p3 = 50; //sous-sol
int p4 = 52; //2eme etage
int p5 = 28; //rez-de-chausser
int p6 = 29; //garage
int p7 = 30; //vide


int v1 = 35; //Chambres des maitres
int v2 = 37; //Walking des maitres
int v3 = 39; //Salle de bain des maitres
int v4 = 41; //Entrée
int v5 = 43; //Salle d'eau
int v6 = 45; //Bureau de Cyndie
int v7 = 47; //Chambre de Bibi
int v8 = 49; //Chambre de Will
int v9 = 51; //Salle de bain sous-sol + hall
int v10 = 53; //Chambre de Mik
int v11 = 34; //Chambre de Jade
int v12 = 36; //vide
int v13 = 38; //vide
int v14 = 40; //vide
int v15 = 42; //vide
int v16 = 44; //vide

int Enable = 2;


void setup() {

  Serial1.begin(9600);

  pinMode (p1, OUTPUT);
  pinMode (p2, OUTPUT);
  pinMode (p3, OUTPUT);
  pinMode (p4, OUTPUT);
  pinMode (p5, OUTPUT);
  pinMode (p6, OUTPUT);
  pinMode (p7, OUTPUT);

  pinMode (v1, OUTPUT);
  pinMode (v2, OUTPUT);
  pinMode (v3, OUTPUT);
  pinMode (v4, OUTPUT);
  pinMode (v5, OUTPUT);
  pinMode (v6, OUTPUT);
  pinMode (v7, OUTPUT);
  pinMode (v8, OUTPUT);
  pinMode (v9, OUTPUT);
  pinMode (v10, OUTPUT);
  pinMode (v11, OUTPUT);
  pinMode (v12, OUTPUT);
  pinMode (v13, OUTPUT);
  pinMode (v14, OUTPUT);
  pinMode (v15, OUTPUT);
  pinMode (v16, OUTPUT);

  digitalWrite(v1, HIGH);
  digitalWrite(v2, HIGH);
  digitalWrite(v3, HIGH);
  digitalWrite(v4, HIGH);
  digitalWrite(v5, HIGH);
  digitalWrite(v6, HIGH);
  digitalWrite(v7, HIGH);
  digitalWrite(v8, HIGH);
  digitalWrite(v9, HIGH);
  digitalWrite(v10, HIGH);
  digitalWrite(v11, HIGH);
  digitalWrite(v12, HIGH);
  digitalWrite(v13, HIGH);
  digitalWrite(v14, HIGH);
  digitalWrite(v15, HIGH);
  digitalWrite(v16, HIGH);

  digitalWrite(p1, HIGH);
  digitalWrite(p2, HIGH);
  digitalWrite(p3, HIGH);
  digitalWrite(p4, HIGH);
  digitalWrite(p5, HIGH);
  digitalWrite(p6, HIGH);
  digitalWrite(p7, HIGH);

  pinMode (Enable, OUTPUT);

  digitalWrite(Enable, HIGH);
  pinMode(flowpin, INPUT);

  attachInterrupt(1, Flow, RISING);

  sensors.begin();


  lcd.init();
  lcd.backlight();




  lcd.setCursor(0, 0);
  lcd.print("Master Thermostats");
  lcd.setCursor(0, 3);
  lcd.print("Version 1.0");
  delay(2000);
  lcd.clear();
}

void loop() {


  sensors.requestTemperatures();
  currentmillis = millis();

  //------------------menu-------------------//

  lcd.clear();
  switch (menu) {

    case 1:
      lcd.clear();

      lcd.setCursor(0, 0);
      lcd.print("Chambre mik");
      lcd.setCursor(4, 1);
      lcd.print("temperature:");
      lcd.setCursor(0, 2);
      lcd.print("A:");
      lcd.setCursor(2, 2);
      lcd.print(tath1);
      lcd.setCursor(12, 2);
      lcd.print("P:");
      lcd.setCursor(14, 2);
      lcd.print(tpth1);

      if (th1 == 1) {
        lcd.setCursor(9, 3);
        lcd.print("On ");
      } else {
        lcd.setCursor(9, 3);
        lcd.print("Off");
      }

      break;
    case 2:
      lcd.clear();

      lcd.setCursor(0, 0);
      lcd.print("Hall d'Entree");
      lcd.setCursor(4, 1);
      lcd.print("temperature:");
      lcd.setCursor(0, 2);
      lcd.print("A:");
      lcd.setCursor(2, 2);
      lcd.print(tath6);
      lcd.setCursor(12, 2);
      lcd.print("P:");
      lcd.setCursor(14, 2);
      lcd.print(tpth6);

      if (th6 == 1) {
        lcd.setCursor(9, 3);
        lcd.print("On ");
      } else {
        lcd.setCursor(9, 3);
        lcd.print("Off");
      }

      break;
    case 3:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("reverse1");
      lcd.setCursor(12, 0);
      lcd.print("reserve2");
      lcd.setCursor(12, 1);
      lcd.print(sensors.getTempC(RG1));
      lcd.setCursor(12, 2);
      lcd.print(sensors.getTempC(RG2));
      lcd.setCursor(12, 3);
      lcd.print(sensors.getTempC(RG3));


      lcd.setCursor(0, 1);
      lcd.print(sensors.getTempC(RD1));
      lcd.setCursor(0, 2);
      lcd.print(sensors.getTempC(RD2));
      lcd.setCursor(0, 3);
      lcd.print(sensors.getTempC(RD3));



      break;

  }

  //------------------------Logique-----------------------//

  if (th6 == 1 && sensors.getTempC(RG2) >= 60 && sensors.getTempC(RD2) >= 60){
    digitalWrite(p3, LOW);
    digitalWrite(p4, LOW);
    digitalWrite(p5, LOW);
  } else {
    digitalWrite(p3, HIGH);
    digitalWrite(p4, HIGH);
    digitalWrite(p5, HIGH);
    
  }

  if (sensors.getTempC(RG3) >= 72 && sensors.getTempC(RD3) >= 72) {
    digitalWrite(p6, LOW);
  }
  if (sensors.getTempC(RG3) <= 70 && sensors.getTempC(RD3) <= 70) {
    digitalWrite(p6, HIGH);
  }
  
  //Entrée
  digitalWrite(Enable, HIGH);

  Serial1.print("I");
  Serial1.print("16"); // slave id
  Serial1.print("L");
  Serial1.print("F");
  Serial1.flush();

  digitalWrite(Enable, LOW);

  delay(15);

  if (Serial1.find("i")) {
    delay(10);
    if (Serial1.read() == '6') {
      th6 = Serial1.parseInt();
      if (Serial1.read() == 'a') {
        tath6 = Serial1.parseFloat();
        if (Serial1.read() == 'p') {
          tpth6 = Serial1.parseFloat();
          if (Serial1.read() == 'f') {
          }
        }
      }
    }
  }
  delay(100);


  if (flowRate >= 1) {
    digitalWrite(p2, LOW);
  } else {
    digitalWrite(p2, HIGH);
  }

  count = 0;
  interrupts();
  delay(1000);
  noInterrupts();

  flowRate = (count * 2.25);
  flowRate = flowRate * 60;
  flowRate = flowRate / 1000;


  if (currentmillis - lastMillisScroll >= 2000) {
    lastMillisScroll = currentmillis;
    menu = menu + 1;
  }
  if (menu == 4) {
    menu = 1;
  }


}


//----------------interrupt---------------//

void Flow() {
  count++;
}

Slave code :

int menu = 0;
int parametres = 0;
unsigned long LastTimeButtonPressed;
unsigned long CurrentTime;

const int Enable = 2;
const int Sl1 = 16;

float dAmbiant = 1;
float dPlancher = 2;

float minAmbiant = 15;
float maxAmbiant = 28;
float minPlancher = 15.5;
float maxPlancher = 28;

int LastButtonPressed = 0;

int th1 = 1;

float setTempAmbiant = 19.5;
float setTempPlancher = 25.5;

#include <DallasTemperature.h>
#include <OneWire.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define OLED_RESET 4
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define ONE_WIRE_BUS 3 //Pin sur laquelle est connecter les capteur de temperature

OneWire oneWire (ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

DeviceAddress S1 = { 0x28, 0x4C, 0x0F, 0x95, 0xF0, 0x01, 0x3C, 0x4D };  //AMBIANT
DeviceAddress S2 = { 0x28, 0xEC, 0x64, 0x95, 0xF0, 0x01, 0x3C, 0x70 };  //PLANCHER


float tath = 0;
float tpth = 0;

const uint8_t Maison1  [] PROGMEM = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x06, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x30, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x20, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x06, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0xc0, 0x00,
  0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x08, 0x00,
  0x00, 0x00, 0x00, 0xc0, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x03, 0x40, 0x00, 0x00, 0x05, 0x80,
  0x00, 0x00, 0x04, 0x40, 0x00, 0x00, 0x04, 0x40, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00,
  0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x04, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x03, 0xc0, 0x07, 0x80, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x30, 0x18, 0x60, 0x00,
  0x00, 0x00, 0x00, 0x10, 0x08, 0x20, 0x10, 0x00, 0x00, 0x00, 0x00, 0x20, 0x04, 0x40, 0x08, 0x00,
  0x00, 0x00, 0x00, 0x21, 0x84, 0x43, 0x08, 0x00, 0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x44, 0x44, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x43, 0x84, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x40, 0x04, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x20, 0x08, 0x88, 0x00,
  0x00, 0x00, 0x00, 0x22, 0x18, 0x30, 0x88, 0x00, 0x00, 0x00, 0x00, 0x14, 0x07, 0xc0, 0x50, 0x00,
  0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
const uint8_t Flame2 [] PROGMEM = {
  0x00, 0x00, 0x20, 0x40, 0x40, 0x40, 0x20, 0x10, 0x10, 0x10, 0x20, 0x00, 0x00
};







void setup() {

  Serial1.begin(9600);
  pinMode(Enable, OUTPUT);
  pinMode(4, INPUT_PULLUP);
  pinMode(5, INPUT_PULLUP);
  pinMode(6, INPUT_PULLUP);




  digitalWrite(Enable, LOW);
  sensors.begin();

  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial1.println(F("SSD1306 a manquer sa shot"));
    for (;;);
  }
  display.display();
  display.clearDisplay();
}
void loop() {

  if (digitalRead(6) == LOW) {
    LastButtonPressed = 4;
    LastTimeButtonPressed = CurrentTime;
  }

  CurrentTime = millis();

  if ((digitalRead(6) == LOW && menu == 1) && (parametres == 0)) {
    menu = -1;
    LastTimeButtonPressed = CurrentTime;
  }
  if ((digitalRead(6) == LOW && menu != 2) && (parametres == 0)) {
    menu++;
    LastTimeButtonPressed = CurrentTime;
  }
  if (CurrentTime - LastTimeButtonPressed > 10000) {
    menu = 0;
    parametres = 0;
    LastButtonPressed = 0;
  }
  if ((CurrentTime - LastTimeButtonPressed > 3000 && menu == -1) && (parametres <= 7)) {
    LastButtonPressed = 0;
  }


  if ((digitalRead(4) == LOW && menu == 1) && (setTempAmbiant != minAmbiant)) {
    setTempAmbiant = setTempAmbiant - 0.5;
    LastTimeButtonPressed = CurrentTime;
  }
  if ((digitalRead(5) == LOW && menu == 1) && (setTempAmbiant != maxAmbiant)) {
    setTempAmbiant = setTempAmbiant + 0.5;
    LastTimeButtonPressed = CurrentTime;
  }
  if (digitalRead(6) == LOW && menu == 0) {
    menu = 1;
  }

  if ((sensors.getTempC(S1)) <= setTempAmbiant - dAmbiant  && (sensors.getTempC(S2)) <= setTempPlancher - dPlancher) {
    th1 = 1;
  }
  if ((sensors.getTempC(S1)) >= setTempAmbiant || (sensors.getTempC(S2)) >= setTempPlancher) {
    th1 = 0;
  }

  if ((digitalRead(4) == LOW && digitalRead(5) == LOW) && (menu >= 0)) {
    LastTimeButtonPressed = CurrentTime;
    parametres = 1;
    menu = -1;
  }


  if ((digitalRead(5) == LOW && parametres < 7) && (LastButtonPressed != 4 && menu == -1)) {
    parametres++;
    LastTimeButtonPressed = CurrentTime;
    LastButtonPressed = 3;
  }
  if ((digitalRead(4) == LOW && parametres >= 1) && (LastButtonPressed != 4 && menu == -1)) {
    parametres--;
    LastTimeButtonPressed = CurrentTime;
    LastButtonPressed = 2;
  }

  if ((parametres == 1 && LastButtonPressed == 4) && (digitalRead(5) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    dAmbiant = dAmbiant + 0.5;
  }
  if ((parametres == 1 && LastButtonPressed == 4) && (digitalRead(4) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    dAmbiant = dAmbiant - 0.5;
  }
  if ((parametres == 2 && LastButtonPressed == 4) && (digitalRead(5) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    dPlancher = dPlancher + 0.5;
  }
  if ((parametres == 2 && LastButtonPressed == 4) && (digitalRead(4) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    dPlancher = dPlancher - 0.5;
  }
  if ((parametres == 3 && LastButtonPressed == 4) && (digitalRead(5) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    minAmbiant = minAmbiant + 0.5;
  }
  if ((parametres == 3 && LastButtonPressed == 4) && (digitalRead(4) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    minAmbiant = minAmbiant - 0.5;
  }
  if ((parametres == 4 && LastButtonPressed == 4) && (digitalRead(5) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    maxAmbiant = maxAmbiant + 0.5;
  }
  if ((parametres == 4 && LastButtonPressed == 4) && (digitalRead(4) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    maxAmbiant = maxAmbiant - 0.5;
  }
  if ((parametres == 5 && LastButtonPressed == 4) && (digitalRead(5) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    minPlancher = minPlancher + 0.5;
  }
  if ((parametres == 5 && LastButtonPressed == 4) && (digitalRead(4) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    minPlancher = minPlancher - 0.5;
  }
  if ((parametres == 6 && LastButtonPressed == 4) && (digitalRead(5) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    maxPlancher = maxPlancher + 0.5;
  }
  if ((parametres == 6 && LastButtonPressed == 4) && (digitalRead(4) == LOW)) {
    LastTimeButtonPressed = CurrentTime;
    maxPlancher = maxPlancher - 0.5;
  }
  if ((parametres == 7 && LastButtonPressed == 4) && (digitalRead(5) == LOW && setTempPlancher != maxPlancher)) {
    LastTimeButtonPressed = CurrentTime;
    setTempPlancher = setTempPlancher + 0.5;
  }
  if ((parametres == 7 && LastButtonPressed == 4) && (digitalRead(4) == LOW && setTempPlancher != minPlancher))  {
    LastTimeButtonPressed = CurrentTime;
    setTempPlancher = setTempPlancher - 0.5;
  }


  sensors.requestTemperatures();

  if (parametres >= 5) {
    display.setCursor(10, 35);
    display.print("Version 1.0");
  }

  switch (menu) {
    case 0:


      display.setTextColor(SSD1306_WHITE);
      display.setCursor(0, 0);
      display.setTextSize(2);
      display.print(sensors.getTempC(S1));
      display.print("C");
      display.print((char)247);
      display.setCursor(0, 20);
      display.setTextSize(1);
      display.print(setTempAmbiant);
      display.print("C");
      display.print((char)247);
      if (th1 == 1) {
        display.print("...");
      }

      display.drawLine(0, 32, 128, 32, SSD1306_WHITE);
      display.drawLine(90, 32, 116, 32, BLACK);
      display.drawBitmap(64, 1, Maison1, 64, 64, WHITE);


      display.setTextColor(SSD1306_WHITE);
      display.setCursor(0, 48);
      display.setTextSize(2);
      display.print(sensors.getTempC(S2));
      display.print("C");
      display.print((char)247);
      display.setCursor(0, 38);
      display.setTextSize(1);
      display.print(setTempPlancher);
      display.print("C");
      display.print((char)247);

      display.display();
      display.clearDisplay();
      break;

    case 1:

      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(15, 0);
      display.print("consigne");
      display.drawLine(15, 15, 108, 15, WHITE);

      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(20, 30);
      display.print(setTempAmbiant);
      display.print("C");
      display.print((char)247);

      display.display();
      display.clearDisplay();
      break;

    default:

      break;
  }
  switch (parametres) {
    case 1:

      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(0, 0);
      display.print("Parametres");

      display.setCursor(0, 20);
      display.setTextSize(1);
      display.print(">");

      display.setCursor(12, 20);
      display.print("D. ambiant:");
      display.setCursor(96, 20);
      display.print(dAmbiant);

      display.setCursor(12, 30);
      display.print("D. plancher:");
      display.setCursor(96, 30);
      display.print(dPlancher);

      display.setCursor(12, 40);
      display.print("Min. ambiant:");
      display.setCursor(96, 40);
      display.print(minAmbiant);

      display.setCursor(12, 50);
      display.print("Max. ambiant:");
      display.setCursor(96, 50);
      display.print(maxAmbiant);


      if (parametres ==  1 && LastButtonPressed == 4) {
        display.setCursor(0, 20);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();

      break;

    case 2:

      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(0, 0);
      display.print("Parametres");

      display.setCursor(0, 30);
      display.setTextSize(1);
      display.print(">");

      display.setCursor(12, 20);
      display.print("D. ambiant:");
      display.setCursor(96, 20);
      display.print(dAmbiant);

      display.setCursor(12, 30);
      display.print("D. plancher:");
      display.setCursor(96, 30);
      display.print(dPlancher);

      display.setCursor(12, 40);
      display.print("Min. ambiant:");
      display.setCursor(96, 40);
      display.print(minAmbiant);

      display.setCursor(12, 50);
      display.print("Max. ambiant:");
      display.setCursor(96, 50);
      display.print(maxAmbiant);

      if (parametres ==  2 && LastButtonPressed == 4) {
        display.setCursor(0, 30);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();

      break;

    case 3:

      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(0, 0);
      display.print("Parametres");

      display.setCursor(0, 40);
      display.setTextSize(1);
      display.print(">");
      display.setCursor(12, 20);

      display.setCursor(12, 20);
      display.print("D. ambiant:");
      display.setCursor(96, 20);
      display.print(dAmbiant);

      display.setCursor(12, 30);
      display.print("D. plancher:");
      display.setCursor(96, 30);
      display.print(dPlancher);

      display.setCursor(12, 40);
      display.print("Min. ambiant:");
      display.setCursor(96, 40);
      display.print(minAmbiant);

      display.setCursor(12, 50);
      display.print("Max. ambiant:");
      display.setCursor(96, 50);
      display.print(maxAmbiant);

      if (parametres ==  3 && LastButtonPressed == 4) {
        display.setCursor(0, 40);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();
      break;

    case 4:

      display.setTextColor(WHITE);
      display.setTextSize(2);
      display.setCursor(0, 0);
      display.print("Parametres");

      display.setCursor(0, 50);
      display.setTextSize(1);
      display.print(">");

      display.setCursor(12, 20);
      display.print("D. ambiant:");
      display.setCursor(96, 20);
      display.print(dAmbiant);

      display.setCursor(12, 30);
      display.print("D. plancher:");
      display.setCursor(96, 30);
      display.print(dPlancher);

      display.setCursor(12, 40);
      display.print("Min. ambiant:");
      display.setCursor(96, 40);
      display.print(minAmbiant);

      display.setCursor(12, 50);
      display.print("Max. ambiant:");
      display.setCursor(96, 50);
      display.print(maxAmbiant);

      if (parametres ==  4 && LastButtonPressed == 4) {
        display.setCursor(0, 50);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();

      break;

    case 5:

      display.setTextColor(WHITE);
      display.setTextSize(1);

      display.setCursor(0, 0);
      display.setTextSize(1);
      display.print(">");

      display.setCursor(12, 0);
      display.print("Min. plancher:");
      display.setCursor(96, 0);
      display.print(minPlancher);

      display.setCursor(12, 10);
      display.print("Max. plancher:");
      display.setCursor(96, 10);
      display.print(maxPlancher);

      display.setCursor(12, 20);
      display.print("C. Plancher");
      display.setCursor(96, 20);
      display.print(setTempPlancher);

      if (parametres ==  5 && LastButtonPressed == 4) {
        display.setCursor(0, 0);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();

      break;

    case 6:

      display.setTextColor(WHITE);
      display.setTextSize(1);

      display.setCursor(0, 10);
      display.setTextSize(1);
      display.print(">");

      display.setCursor(12, 0);
      display.print("Min. plancher:");
      display.setCursor(96, 0);
      display.print(minPlancher);

      display.setCursor(12, 10);
      display.print("Max. plancher:");
      display.setCursor(96, 10);
      display.print(maxPlancher);

      display.setCursor(12, 20);
      display.print("C. Plancher");
      display.setCursor(96, 20);
      display.print(setTempPlancher);

      if (parametres ==  6 && LastButtonPressed == 4) {
        display.setCursor(0, 10);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();

      break;

    case 7:

      display.setTextColor(WHITE);
      display.setTextSize(1);

      display.setCursor(0, 20);
      display.setTextSize(1);
      display.print(">");

      display.setCursor(12, 0);
      display.print("Min. plancher:");
      display.setCursor(96, 0);
      display.print(minPlancher);

      display.setCursor(12, 10);
      display.print("Max. plancher:");
      display.setCursor(96, 10);
      display.print(maxPlancher);

      display.setCursor(12, 20);
      display.print("C. Plancher");
      display.setCursor(96, 20);
      display.print(setTempPlancher);

      if (parametres ==  7 && LastButtonPressed == 4) {
        display.setCursor(0, 20);
        display.setTextColor(BLACK, WHITE);
        display.print(">");
      }

      display.display();
      display.clearDisplay();

      break;

    default:

      break;
  }
  //----------------------------------------------------------//
  if (Serial1.available())
  {
    if (Serial1.read() == 'I')
    {
      int Slave1 = Serial1.parseInt();
      if (Slave1 == Sl1)
      {
        char command = Serial1.read();
        if (command == 'L')
        {
          if (Serial1.read() == 'F')
          {

            digitalWrite(Enable, HIGH);

            Serial1.print("i");
            Serial1.print("6");
            Serial1.print(th1);
            Serial1.print("a");
            Serial1.print(tath);
            Serial1.print("p");
            Serial1.print(tpth);
            Serial1.print("f");
            Serial1.flush();

            digitalWrite(Enable, LOW);
          }
        }
      }
    }
  }

  tath = sensors.getTempC(S1);
  tpth = sensors.getTempC(S2);
  delay(10);
}

wiring diagram for rs485 :smile:

image
image1100×571 78.3 KB

4

To debug this problem, start with a MUCH simpler program that just sends a single character to each slave, with a response to the master.

Thanks for the wiring diagram, but that shows only one slave.

5

Thanks ! i'll try it

sorry for the diagram :frowning_face:

6

Hello
Did you study the interface requierment specification of a RS485 network?

7

With RS485 adapters, make sure you pay attention to proper line termination. Post a link to the data sheet for the adapters you are using.

8

If those are the adapters you are using, you should remove the terminating resistor on the transmitter. It will be a 120R resistor, and on most of those it is R7. Use a digital multimeter to confirm which resistor it should, checking the value and the connection to pin 6 and pin 7 on the Max485 chip.

9

Have a look at this discussion and my reply #13 with a simple sketch to receive RS485 data via a software serial port on an UNO to control the on-board LED. It supports multiple slaves as well as the ability to broadcast a command to all slaves. That code should work on your Pro Mini.

The message format is start marker, node id, comma, command, end marker. The start marker is '<' and the end marker is '>'. So commands look like <1,0> (device #1 command 0), or <2,1> (device #2 command 1) or <0,3> (all devices command 3).

10

Actually you should remove the terminating resistor from all units except from the slave furthest away from the master. In case of a multiple direction, it probably shouldn't be there at all.

11

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