Hello folks,
I have been working on this project for whole this month . And it is almost complete when this problem happened.
The hardware that I have used
arduino uno
micro sd module
i2c lcd display
4x4 matrix keypad
waveshare barcode reader module
#include<SPI.h>
#include<SD.h>
#include<SoftwareSerial.h>
#include<Keypad.h>
#include<LiquidCrystal_I2C.h>
SoftwareSerial scanner(0,1);
File myFile;
const byte row =4;
const byte col =4;
char keys[row][col] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'},
};
byte rowPin[row] = {2,3,4,5};
byte colPin[col] = {6,7,8,9};
Keypad kpd(makeKeymap(keys),rowPin,colPin,row,col);
LiquidCrystal_I2C lcd(0x27,16,2);
char buff[20];
char barcode[10];
//int amount;
//char button;
int posi;
int old_bal;
void setup() {
Serial.begin(9600);
Serial.println(F("initialized"));
char cut[10];
memset(cut,' ',sizeof(cut)); //this is our EARESER
cut[9]='\0';
// Serial.begin(9600);
scanner.begin(9600);
scanner.listen();
scanner.setTimeout(50);
lcd.begin(16,2);
lcd.clear();
lcd.backlight();
if( !SD.begin(10))
{lcd.print("No SD"); // Serial.print("No SD");
while(1);}
lcd.print("----------------");
lcd.setCursor(4,0);
lcd.print("Foodlay");
delay(2500);
lcd.clear();
lcd.setCursor(4,0);
lcd.print("made by");
lcd.setCursor(4,1);
lcd.print("NEERAJ");
delay(1000);
top: // Serial.println("SD initialized");
lcd.clear(); // Serial.println("Scanner ready");
lcd.setCursor(4,0);
lcd.print("place card");
resetValues(); Serial.println("value reset");
while(1){
if(scanner.available()){
scanner.readBytes(barcode,sizeof(barcode)-1);
// Serial.println(barcode);
break;
}
}
Serial.println("scanned barcode");
//WHEN I RUN THIS CODE GIVEN UNDER BOUNDERY, BARCODE READER WORKS WELL BUT WHEN THE
// WHOLE CODE GETS COMPILED IT JUST HALTS HERE.
//-------------------------------------------------------------
/*
while(2){
char push =kpd.getKey();
if(push=='A')
{ Serial.println("entered A");
int money =100-detectNumber();
lcd.clear();
lcd.setCursor(0,0);
lcd.print(money);
delay(2000);
lcd.clear();
lcd.print("press button");
Serial.println("Going back to while loop");
}
}*/
//--------------------------------------------------------------
Serial.println("searching in database");
myFile = SD.open("suraj.txt",(O_READ|O_WRITE));
if(myFile) {
while(myFile.available())
{ posi= myFile.position(); // position to later fill line with white space
myFile.readBytesUntil('\n',buff,17);
char *ptr = strchr(buff,' ');
*ptr ='\0';
char *ptr_bar = strchr(barcode,' ');
*ptr_bar = '\0';
old_bal = atoi(++ptr);
if (strcmp(buff,barcode)==0)
{ Serial.println("user exist");
lcd.clear(); // Serial.println("user exists");
lcd.setCursor(0,0);
// Serial.print(buff);
lcd.print("Amount: ");
lcd.setCursor(7,0);
lcd.print(old_bal);
Serial.println("printed user information");
Serial.println("press button");
while(1){
char button = kpd.getKey();
if(button=='A')
{Serial.println("Entered A");
int amount=old_bal-detectNumber();
lcd.clear();
lcd.setCursor(0,0);
lcd.print("New bal:");
lcd.setCursor(9,0);
lcd.print(amount);
Serial.print("New bal:");
Serial.println(amount);
Serial.println("printing data to file");
myFile.seek(posi); //going to the position where match happend
myFile.print(cut);
myFile.seek(posi); //filling the whole line with SPACES (pretending erase)
myFile.print(buff); //its same as before cause we only want to change amount value
myFile.print(" ");
myFile.print(amount);
myFile.flush();
myFile.close();
delay(2000);
Serial.println("going scan mode again");
goto top;
}
else {
Serial.println("you entered key Other then A");
myFile.close();
Serial.println("going to scan mode");
goto top;
}
}
//not using break just skip to "No user exist" line
}
}
Serial.println("whole file scanned :No user");
Serial.println("press A to add other to go scan mode");
lcd.clear();
lcd.setCursor(0,0);
lcd.print("NO user ");
while(1){
char button=kpd.getKey();
if(button=='A')
{Serial.println("A detected");
int amount = detectNumber();
myFile.seek(myFile.size()+1);
myFile.print(barcode);
myFile.print(" ");
myFile.print(amount);
myFile.println(" ");
myFile.flush();
lcd.clear();
lcd.print("USER ADDED");
Serial.println("user added to file");
delay(500);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Bal:");
lcd.setCursor(4,0);
lcd.print(amount);
Serial.println("closing the file");
myFile.close();
Serial.println("going to scan mode");
goto top;
}
else {
Serial.println("Entered Key other than A");
myFile.close();
goto top;
}
}
}
}
void loop() {
// put your main code here, to run repeatedly:
}
void resetValues(void)
{
memset(barcode,'\0',sizeof(barcode));
memset(buff,'\0',sizeof(buff));
posi =0;
old_bal = 0;
}
int detectNumber(void)
{ Serial.println("detectNumber function called");
int temp=0;
int num=0;
char key;
lcd.clear();
while(1){
top_det:
key =kpd.getKey();
if (key=='1')
{ if(num==0)
num=1;
else
num=(num*10)+1;
}
if (key=='2')
{ if(num==0)
num=2;
else
num=(num*10)+2;
}
if (key=='3')
{ if(num==0)
num=3;
else
num=(num*10)+3;
}
if (key=='4')
{ if (num==0)
num= 4;
else
num=(num*10)+4;
}
if (key=='5')
{ if(num==0)
num=5;
else
num=(num*10)+5;
}
if (key=='6')
{ if(num==0)
num=6;
else
num=(num*10)+6;
}
if (key=='7')
{ if(num==0)
num=7;
else
num=(num*10)+7;
}
if (key=='8')
{ if(num==0)
num=8;
else
num=(num*10)+8;
}
if (key=='9')
{ if(num==0)
num=9;
else
num=(num*10)+9;
}
if (key=='0')
{ if (num==0)
num=0;
else
num=(num*10)+0;
}
if (key=='*')
{ lcd.clear();
if(num<=9)
num=0;
else
{
temp=num/10;
num=(num-(num-((temp)*10)))/10;
}
}
if (key=='#')
{
num=0;
lcd.clear();
goto top_det;
}
if (key=='A')
{ Serial.println("returning num");
return num;
}
lcd.setCursor(0,0);
lcd.print(num);
}
}when compiling whole code execution halts at barcode reading stage.
then i entered little sample code to check ( that is enclosed in /* */ section.
then the execution goes normally.
I cannot understand why this is happening.
everything else working fine.
this is the output with whole code compiled.
initialized
value resetthis is the output with sample code inserted in /* */ in the main code.
initialized
value reset
scanned barcode
entered A
detectNumber function called
returning num
Going back to while loop
entered A
detectNumber function called
returning num
Going back to while loop
this is "suraj.txt" file
101 210
102 220
103 230
104 240
105 250
106 260
107 270
108 280
109 290
110 300
111 310
112 320
113 330
114 340
115 350
116 360
117 370
118 380
119 390
120 400
121 410
122 420
123 430
124 440
125 450
126 460
127 470
128 480
129 490
130 500
131 510
132 520
133 530
134 540
135 550
136 560
137 570
138 580
139 590
140 600
141 610
142 620
143 630
144 640
145 650
146 660
147 670
148 680
149 690
150 700 what we want to do?
the first column is barcode and second is amount
with the help of barcode reader we are searching the scanned barcode in the "suraj.txt" file
if found we might want to change the amount related to that barcode or again go to barcode scan mode.
if scanned barcode not found in "suraj.txt" , we might want to add scanned barcode and add it's amount using keypad , and save it to "suraj.txt" file at the end.
Or go back to scanning mode.
Any help would be greatly appriciated.