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Projects General Guidance
1

Hello people

I'm a novice and I'm trying to read data from an epever charge controller using MODBUS according to the following details:

Arduino: Mega

Used library: ModbusMaster
Circuit: rs-485 module connected as follows

1- MAX485_DE → Pin 2 of Arduino
2- MAX485_RE_NEG → Pin 2 of the Arduino
3- MAX485_RO → 19 Arduino RX Pin
4- MAX485_DI → 18 TX Pin of Arduino

Teste.ino (1.2 KB)

The link below has the address of each epever charge controller data

https://drive.google.com/file/d/1MR_LYVdnBIO6cV4cjuRz217lro9rRGKE/view?usp=sharing

I tested the code to get variables like voltage and current and it works normally. My question is how can I get the Battery status, Array status, Charging status, Load status and Array Power(W) data correctly?

2

@anon35854268, your topic has been moved to a more suitable location on the forum. Introductory Tutorials is for tutorials that e.g. you write, not for questions. Feel free to write a tutorial once you have solved your problem :wink:

3

In future, please post your code in a post instead of as an attachment. Not everybody can open ino files on e.g. a cell phone so your missing out on knowledgeable people.

OP's code

#include <ModbusMaster.h>
#include <SPI.h>
#include <SD.h>

#define MAX485_DE      2
#define MAX485_RE_NEG  2


ModbusMaster node;

File myFile;

void preTransmission()
{
  digitalWrite(MAX485_RE_NEG, 1);
  digitalWrite(MAX485_DE, 1);
}

void postTransmission()
{
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);
}

void setup()
{
  pinMode(MAX485_RE_NEG, OUTPUT);
  pinMode(MAX485_DE, OUTPUT);
  // Init no modo de recepção
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);

  Serial1.begin(115200);
  Serial.begin(9600);



  node.begin(1, Serial1);

  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);

  if (!SD.begin(53)) {
    while (1);
  }
}

bool state = true;

void loop()
{
  uint8_t result;
  uint16_t data[6];
  
  result = node.writeSingleCoil(0x0002, state);
  state = !state;

  result = node.readInputRegisters(0x3100,20);
  myFile = SD.open("alex.txt", FILE_WRITE);

  if (result == node.ku8MBSuccess)
  {
    
    Serial.print("Array Current(A): ");
    Serial.print(node.getResponseBuffer(0x01)/100.0f);
    Serial.print(";");

    
  }  
  delay(1000);
}
4

Thank you for the informations

5

A little wiring, drawn by pen and paper is preferred. Word built wirings often hide away the reason for error. It's what's not told that often matters.