Problem with i2c and RXD

Projects Programming
1

Hi friends,

I have uploaded the following program on a nano and get displayed on the display swipe the card.

at rxd, the tx connection of an rfid reader hangs.

tags are detected, at least lights up when the ardu a led but the display does not show the result.

is possibly in the program an obvious error?

greeting

#include <LiquidCrystal_I2C.h>
#include <Wire.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int count = 0;
char singleChar;
String readMsg;

void setup()
{
lcd.begin();
lcd.setCursor (0,0);
lcd.print("Rubinios Scanner");
lcd.setCursor(0,1);
lcd.print(" RFID Reader ");
delay (2000);
}

void loop()
{
if(readMsg ==0)
{
lcd.setCursor(0,0);
lcd.print(" Swipe the Card ");
lcd.setCursor(0,1);
lcd.print(" ");
}
while(Serial.available()>0)
{
lcd.setCursor(0,0);
lcd.print(" Card ID is ");
lcd.setCursor(0,1);
lcd.print(" ");

singleChar = Serial.read();
count++;
readMsg += singleChar;
if(count == 12)
{
lcd.setCursor(2,1);
lcd.print(readMsg);
break;
}
}
readMsg="";
delay(1000);
}

2

If you are going to use the serial port, don't you need Serial.begin(baud) in setup()?

3

He should send only from the tx output of the rfid module to the rxt input of the ardu and output on the display. Do you need it then?

4

If you are going to use Serial.available() and Serial.read() then you need a Serial.begin() to tell the system what speed it's supposed to work at.

Steve