I have a RFID reader with serial port for connection to PC.
I am trying to get it to interface with the arduino uno through a MAX3232.
I have connected pin2 on the DB nine - through the MAX3232 - to digital 3 on the uno.
I get no response from the uno when I scan a tag.
Any help would be appreciated
NB the string manipulation is an aside really it works through the uno and serial monitor and correctly processes the string which is sent by the reader
This is my code…
#include <string.h>
#include <SoftwareSerial.h>
String inputString = “”;// a string to hold incoming data
String previousString = “”;
String outputString = “”;
String rightString = “”;
String leftString = “”;
boolean stringComplete = false;// whether the string is complete
const int led = 13;
const int rxpin1 = 3;
const int txpin1 = 2;
const int rxpin2 = 4;
const int txpin2 = 5;
SoftwareSerial reader(rxpin1, txpin1);
void setup() {
// initialize serial:
Serial.begin(9600);
reader.begin(9600);
digitalWrite(led, LOW);
// reserve 32 bytes for the inputString:
inputString.reserve(32);
//pinMode(led, OUTPUT);
pinMode(rxpin1, INPUT);
}
void loop() {
// clears the string afer processing:
if (stringComplete) {
digitalWrite(led, LOW);
if (inputString != previousString) {
leftString = inputString.substring(4,6) + “-” + inputString.substring(2,4) + “-” + inputString.substring(0,2);
rightString = inputString.substring(18,30);//20? for ear tag reader
outputString = (leftString + " … UK" + rightString +‘\n’);
previousString = inputString;
Serial.print(outputString);
}
// clear the string:
inputString = “”;
stringComplete = false;
}
}
/*
SerialEvent occurs whenever a new data comes in the
hardware serial RX. This routine is run between each
time loop() runs, so using delay inside loop can delay
response. Multiple bytes of data may be available.
*/
void serialEvent() {
if (reader.available()) {
// get the new byte:
digitalWrite(led, LOW);
char inChar = (char) reader.read();
// add it to the inputString:
inputString += inChar;
// if the incoming character is a newline, set a flag
// so the main loop can do something about it:
if ((inChar == ‘\r’) or (inChar == ‘\n’) ) { //or (inputString.length() == 15)
stringComplete = true;
}
}
}
