Send rf433 signal when reading rfid card

[Uranhjorten]

Hi!

I am trying to send a signal with an rf433 transmitter when a parralax rfid reader detects an rfid card. My code seems to stop working when I scan a card.

Can anybody tell me why?

#include <RH_ASK.h>
#include <SPI.h>

RH_ASK driver;

int  val = 0;
char code[10];
int bytesread = 0;

void setup()
{
  //  Serial.begin(9600);    // Debugging only
  //  if (!driver.init())
  //    Serial.println("init failed");

  Serial.begin(2400); // RFID reader SOUT pin connected to Serial RX pin at 2400bps
  pinMode(2, OUTPUT);  // Set digital pin 2 as OUTPUT to connect it to the RFID /ENABLE pin
  digitalWrite(2, LOW);                  // Activate the RFID reader
}

void loop()
{
  rfidReader();
  rf433Trans("Hello world!");
}

void rf433Trans(char * msg) {
  //  char *msg = "Hello World!"; // doesn't need to be constant
  driver.send((uint8_t *)msg, strlen(msg));
  driver.waitPacketSent();
  delay(1000);
}

void rfidReader() {

  if (Serial.available() > 0) {         // if data available from reader
    if ((val = Serial.read()) == 10) {  // check for header
      bytesread = 0;
      while (bytesread < 10) {           // read 10 digit code
        if ( Serial.available() > 0) {
          val = Serial.read();
          if ((val == 10) || (val == 13)) { // if header or stop bytes before the 10 digit reading
            break;                       // stop reading
          }
          code[bytesread] = val;         // add the digit
          bytesread++;                   // ready to read next digit
        }
      }
      if (bytesread == 10) {             // if 10 digit read is complete
        Serial.print("TAG code is: ");   // possibly a good TAG
        Serial.println(code);            // print the TAG code
      }
      bytesread = 0;
      digitalWrite(2, HIGH);                  // deactivate the RFID reader for a moment so it will not flood
      delay(1500);                       // wait for a bit
      digitalWrite(2, LOW);                  // Activate the RFID reader
    }
  }
}

[anon57585045]

Have you tried a RadioHead example sketch to ensure that the hardware is working? Same for the card reader, have you tested it separately?

[Uranhjorten]

Thank you for the reply! Yes I have tried both independently and they work fine on their own.

[anon57585045]

Okay, please edit your original post and put the code in code tags so it can gain some commentary.

Also, do you get any serial output when it runs?

[Uranhjorten]

I get the rfid code once in the serial monitor instead of in a loop, and then the code just seems to stop - I can put in other code instead of the rf433() and that works fine, but something about sending the message over rf433 seems to stop the rfid code from working.. I have considered using two Arduinos communicating over i2c instead, where one Arduino is running the rfid code and the other is running the rf433 code. I just really would prefer to just use 1

[anon57585045]

Why did you #include spi.h?

Try printing the value of 'bytesread'. It may be referencing memory outside of the 'code' array. In connection with that, try increasing the size of 'code'.

Generally, add a lot more serial debug statements.