Hello everybody
I'm completely new to programming and just finished my first project. And it works. At least for an hour or so.
What it does is: After pressing a button, the Arduino accesses a .txt file on a sd-card, counts the lines, generates a random number between 1 and said number of lines, sends this line to an thermoprinter and it is printed. Like I said, this works. However, if I leave it powered on for like an hour, it stops working. (at least the way it should)
When the button is then pressed, it registers the pressed button. But then nothing happens. After quite some time (about 10 minutes), it finds a line and prints it.
What I found so far is, that the sd-card reader might be the problem. This is supported by the fact, that it registers that the button was pressed, but then doesn't access the sd-card.
I also have to add that this problem is not consistent. Sometimes it suddenly works again as supposed...
Hardware used:
- Arduino micro pro
- SD-card reader: got not much information on that, but the EAN is 4251266703204
- Thermoprinter: Adafruit ADA2753
- SD-card: Intenso High Performance microSDHC-card 4 GB, EAN 4034303016099
Wiring:
Code:
#include <SPI.h>
#include <SD.h>
#include "Adafruit_Thermal.h"
#include "SoftwareSerial.h"
#define TX_PIN 6 // Arduino transmit YELLOW WIRE labeled RX on printer
#define RX_PIN 5 // Arduino receive GREEN WIRE labeled TX on printer
SoftwareSerial mySerial(RX_PIN, TX_PIN); // Declare SoftwareSerial obj first
Adafruit_Thermal printer(&mySerial); // Pass addr to printer constructor
String Text="default";
String fileName="print.txt";
File myFile;
char cha;
int zaehlerzeile;
int zaehlersuche;
int gefunden=0;
int loop1=0;
int linescounted=0;
int ziel;
int maxzeile;
int max;
void setup() {
pinMode(2, INPUT);
pinMode(3, OUTPUT);
digitalWrite(3,HIGH);
Serial.begin(9600);
mySerial.begin(9600);
//Printer setup
printer.begin();
printer.setLineHeight(50);
}
void loop (){
//Pressing button on pin 2 starts process
if(digitalRead(2)){
Serial.println("button pressed");
delay(1000);
initializeCard();
//read lines on SD card
countlines();
randomSeed(micros());
max=zaehlerzeile+1;
//generate random number
zaehlersuche=random(1, max);
//seek and save line
seekline();
//print
printing();
Text="";
}
}
void initializeCard(){
if(!SD.begin(4)){
while(1);
}
}
void countlines(){
myFile=SD.open(fileName);
if(myFile){
zaehlerzeile=0;
while(myFile.available()){
cha=myFile.read();
if(cha=='\n'){
zaehlerzeile++;
}
}
zaehlerzeile++;
}
myFile.close();
maxzeile=zaehlerzeile;
}
void seekline(){
gefunden=0;
myFile=SD.open(fileName);
if(myFile){
zaehlerzeile=1;
while(myFile.available()){
if(zaehlersuche==1){
read();
}
while(gefunden==0){
cha=myFile.read();
if(cha=='\n'){
zaehlerzeile++;
if(zaehlerzeile==zaehlersuche){
read();
}
}
}
}
}
myFile.close();
}
void read(){
Text=myFile.readStringUntil('\n');
gefunden=1;
myFile.close();
}
void printing(){
printer.justify('C');
printer.setSize('L');
printer.setLineHeight(50);
Serial.println("printing geöffnet");
Serial.println(Text);
printer.println("");
printer.println("");
printer.println("");
printer.println(Text);
printer.println("");
printer.println("");
printer.println("");
printer.println("");
//delay(2000);
Serial.println("ende");
}
So, if anybody got an idea why this delay happens, please tell me.
Thanks for your help!