hello!
i am looking for some help with a project,the project I'm currently working on using
- Arduino Mega (MASTER)
- Arduino Nano (SLAVE) with SW420 (Vibration Sensor) and DHT11 (Temperature and Humidity Sensor) (2)
- Max485 Ttl To Rs485 Converter Module (3)
pin configuration:
Master :
MASTER (Arduino Mega):
RS485 Module
- Pin A,B Master to A,B Slave
- VCC Ground to 5V and Ground
- Pin DE,RE to Pin 2
- Pin RO to Pin 11
- Pin DI to Pin 12
SLAVE (Arduino Nano):
RS485 Module
- Pin A,B Master to A,B Slave
- VCC Ground to 5V and Ground
- Pin DE,RE to Pin D4
- Pin RO to Pin D3
- Pin DI to Pin D2
DHT11
- VCC Ground to 5V and Ground
- Pin Data to Pin D8
SW420
- VCC Ground to 5V and Ground
- Pin Data to Pin D9
Here I try to use the Modbus RTU Library.
I've been trying this for 3 weeks 
But, the result is still the same still can't send data. What's wrong with my code or the microcontroller or what?
Here is the code and the result
MASTER
#include <ModbusRtu.h>
#define slaveNumber 5
#define delayCom 15
#define maxQuery 2*2//slaveNumer*2
#include <SoftwareSerial.h>
SoftwareSerial mySerial(11,12);
uint8_t u8state; //!< machine state
uint8_t u8query; //!< pointer to message query
uint16_t dataBus[slaveNumber*2];
uint16_t lastPrint=100;
int slaveID[slaveNumber] = {11,12,13,14,15};
/**
* Modbus object declaration
* u8id : node id = 0 for master, = 1..247 for slave
* port : Serial1 port
* u8txenpin : 0 for RS-232 and USB-FTDI
* or any pin number > 1 for RS-485
*/
Modbus master(0,mySerial,2); // ID, seriapNumber, enablePin
/**
* This is an structe which contains a query to an slave device
*/
modbus_t telegram[slaveNumber*2];
unsigned long u32wait;
void init_modBus(){
int num=0;
int addr=0;
////SLAVE 1
// Read 1 data from Slave 11
telegram[num].u8id = slaveID[0]; // slave address
telegram[num].u8fct = 3; // function code (this one is registers read)
telegram[num].u16RegAdd = 0; // start address in slave
telegram[num].u16CoilsNo = 2; // number of elements (coils or registers) to read
telegram[num].au16reg = dataBus; // pointer to a memory array in the Arduino
num+=1;
addr+=2;
// Write 1 data to Slave 11
telegram[num].u8id = slaveID[0]; // slave address
telegram[num].u8fct = 6; // function code (this one is write a multiple register)
telegram[num].u16RegAdd = 2; // start address in slave
telegram[num].u16CoilsNo = 1; // number of elements (coils or registers) to write
telegram[num].au16reg = dataBus+2; // pointer to a memory array in the Arduino
num+=1;
addr+=1;
//
////SLAVE 2
// // Read 1 data from Slave 2
// telegram[num].u8id = slaveID[1]; // slave address
// telegram[num].u8fct = 3; // function code (this one is registers read)
// telegram[num].u16RegAdd = 0; // start address in slave
// telegram[num].u16CoilsNo = 2; // number of elements (coils or registers) to read
// telegram[num].au16reg = dataBus+3; // pointer to a memory array in the Arduino
// num+=1;
// addr+=2;
//
// // Write 1 data to Slave 2
// telegram[num].u8id = slaveID[1]; // slave address
// telegram[num].u8fct = 16; // function code (this one is write a multiple register)
// telegram[num].u16RegAdd = 2; // start address in slave
// telegram[num].u16CoilsNo = 1; // number of elements (coils or registers) to write
// telegram[num].au16reg = dataBus+5; // pointer to a memory array in the Arduino
// num+=1;
// addr+=1;
master.start();
master.setTimeOut( 100 ); // if there is no answer in 100 ms, roll over
u32wait = millis() + 40;
u8state = u8query = 0;
}
void rtuState(){
switch( u8state ) {
case 0:
if (millis() >= u32wait) u8state++; // wait state
break;
case 1:
master.query( telegram[u8query] ); // send query (only once)
u8state++;
u8query++;
if (u8query >= maxQuery)
u8query = 0;
break;
case 2:
master.poll(); // check incoming messages if communication in idle state
if (master.getState() == COM_IDLE) {
u8state = 0;
u32wait = millis() + delayCom; //delay for next state
}
break;
}
}
void printData(){
if (millis() - lastPrint>200){
Serial.print(dataBus[0]); Serial.print(":");
Serial.print(dataBus[1]); Serial.print(":");
Serial.print(dataBus[2]); Serial.print("\t:\t");
Serial.println();
}
}
void setup() {
Serial.begin (9600); //baud rate of Serial PC
mySerial.begin(19200); // baud-rate of RS485
init_modBus();
}
void loop() {
rtuState();
printData();
}
SLAVE
//SLAVE MENGIRIM DATA DETAK JANTUNG//
#include <ModbusRtu.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3);
#include "DHT.h"
#define slaveID 11
//#define trigPin 9
//#define echoPin 10//CARI EN PIN NOMOR BERAPA
#define DHTPIN 8
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
int vs=9; //pin vibration
uint16_t suhu =0;
uint16_t lembab=0;
uint16_t getar=0;
unsigned long lastPrint=0;
// data array for modbus network sharing
uint16_t au16data[4] = {
slaveID, 225, 8888,9999};
Modbus slave(slaveID,mySerial,4); // this is slave @1 and RS-232 or USB-FTDI
void setup() {
Serial.begin(9600);
mySerial.begin( 19200 ); // baud-rate at 19200
slave.start();
delay(10);
dht.begin();
}
void loop() {
slave.poll( au16data, 4 );
if (millis() - lastPrint>200){
Serial.print(au16data[0]); Serial.print(":");
Serial.print(au16data[1]); Serial.print(":");
Serial.print(au16data[2]); Serial.println();
lastPrint = millis();
}
suhu = dht.readHumidity();
au16data[1] = suhu;
}
Result
Are there any suggestions for what I can do and references I should study?