read MiFare card not working

[wallas77]

I used the /dev/ttyusbmodem1431 and the readMifare sketch doesn't display anything in the serial monitor, if I use another sketch like TimeCheck the println in the serial monitor works correctly.

I include an image of the TimeCheck sketch

thanks in advance

[Franklin97355]

Wallas77 could we get some more information. Are you using the shield and on what Arduino? how is it powered and what are the cards you are using?

[ktownsend]

Please post new questions in new threads, thanks.

[wallas77]

I'm using an arduino yun with the NFC + RFID shield, the power supply is with a USB to mini USB cable directly to the computer

[adafruit_support_rick]

This is a Yun thing - it has nothing to do with the NFC shield. Sometimes with Yun and Leonardo the serial monitor doesn't want to connect properly. One thing you can do is wait for it to connect. Try changing the beginning of the setup() function:

Code: Select all

void setup(void) {
  while (!Serial);    //wait for a serial connection
  Serial.begin(115200);

  Serial.println("Hello!");

...etc...