Modbus RTU SD Read & Write with

1//RS-485 Modbus Slave (Arduino UNO)
2//Circuit OZOX
3
4#include<ModbusRtu.h>       //Library for using Modbus in Arduino
5#include <Servo.h>          //Library  for using Servo Motor
6#include <SD.h>             //Library for using SD Card
7#include  <SPI.h>            //Library for using SPI IO
8
9#define led1 2              //Define  as 2 led1 
10#define led2 5              //Define as 5 led2
11#define led3 7              //Define  as 7 led3 
12#define led4 8              //Define as 8 led4 
13#define but 3               //Define  as 3 but as Button 
14
15#define CS_PIN 9            //Define as 9 CS pin for  SPI
16
17File myFile;
18
19Servo servo;                         //Initilize  servo object for class Servo
20Modbus bus;                          //Define Object  bus for class modbus 
21uint16_t modbus_array[10];           //Array initilized
22const  int chipSelect = 10;
23int btnSta = 0;
24int myFi[10];
25String s = " ";
26String  myf[10];
27  
28void setup()
29{
30  pinMode(led1,OUTPUT);           //Led1  set as OUTPUT
31  pinMode(led2,OUTPUT);           //Led2 set as OUTPUT
32  pinMode(led3,OUTPUT);           //Led2 set as OUTPUT
33  pinMode(led4,OUTPUT);           //Led2 set  as OUTPUT
34  pinMode(9, OUTPUT);
35  pinMode(3, INPUT);
36  
37  SD.begin(CS_PIN);
38  Serial.begin(9600);
39
40  myFile = SD.open("test.txt", FILE_READ);
41  if(myFile)
42  {
43    for(int i=0;i<10;i++)
44    {
45    myFi[i]=myFile.parseInt();
46    modbus_array[i] = myFi[i];
47    } 
48   myFile.close();
49  }
50  else{
51    for(int i=0;i<10;i++)
52    {
53    modbus_array[i] = 0x00;
54    }
55    Serial.print("File  didnt open...");
56    delay(20);
57  }
58  
59  servo.attach(6);                //Servo  PWM pin 6
60  bus = Modbus(1,1,4);            //Modbus slave ID as 1 and 1 connected  via RS-485 and 4 connected to DE & RE pin of RS-485 Module 
61  bus.begin(9600);                //Modbus slave baudrate at 9600
62}
63
64void loop()
65{
66   bus.poll(modbus_array,sizeof(modbus_array)/sizeof(modbus_array[0]));       //Used  to receive or write value from Master 
67  
68  if (modbus_array[0] == 0)
69  {
70    digitalWrite(led1,LOW);
71  }
72  else
73  {
74     digitalWrite(led1,HIGH);
75  } 
76
77 if (modbus_array[1] == 0)
78  {
79    digitalWrite(led2,LOW);
80  }
81  else
82  {
83     digitalWrite(led2,HIGH);
84  }
85   if (modbus_array[2]  == 0)
86  {
87    digitalWrite(led3,LOW);
88  }
89  else
90  {
91     digitalWrite(led3,HIGH);
92  }
93   if (modbus_array[3] == 0)
94  {
95    digitalWrite(led4,LOW);
96  }
97  else
98  {
99     digitalWrite(led4,HIGH);
100  }
101  int pwm = modbus_array[4];
102  servo.write(pwm);
103  
104  btnSta = digitalRead(but);
105  if(btnSta==LOW)
106  {
107  }
108  else
109  {
110      SD.remove("test.txt");
111      delay(10);
112      write_(myFile);
113      //oku(myFile)); // Eer dosyay okumak isterseniz.
114  }
115  delay(250);
116  }
117
118  void write_(File ff)
119  {
120    String dd="";
121       ff = SD.open("test.txt", FILE_WRITE);
122       if(ff)
123       {
124    for(int i=0;i<10;i++)
125    {
126    myFi[i] = (int)modbus_array[i];
127    dd  += myFi[i] + s;
128    }
129    ff.print(dd);
130    ff.close();
131     Serial.print("Yazlan  deerler: " + dd);
132       }
133       else
134       {
135        Serial.print("File  didnt open..");
136        delay(20);
137       }
138  }
139
140    void read_(File  ff)
141  {
142    String gg="";
143    ff = SD.open("test.txt", FILE_READ);
144    if(ff)
145    {
146    for(int i=0;i<10;i++)
147    {
148    myFi[i] = ff.parseInt();
149    }
150    for(int i=0;i<10;i++)
151    {
152      gg += myFi[i] + s;
153    }
154    ff.close();
155    Serial.print("Okunan deerler: " + gg);
156    }
157    else
158    {
159        Serial.print("File didnt open..");
160        delay(20);
161    }
162  }
163