I’m currently working on a project with Android, Firebase, and Arduino, where I want to send the UID from the FireBase project, to my arduino (after registering a new user) so that I can write it to a MIFARE tag using the MFRC522. I'm doing this with a USB OTG cable. For sending the UID string to arduino i'm using this [UsbSerial Library][1, which i found on this blogpost:
https://www.allaboutcircuits.com/projects/communicate-with-your-arduino-through-android/
Connecting with Arduino is working and when sending the UID from the app it shows be the UID string that I've just sent.However, when I read the tag, it shows a string like this:
⸮J⸮⸮⸮-⸮Zz⸮⸮Z/m⸮) h⸮1=#⸮⸮⸮⸮=?⸮
When I manually write the UID string to the serial monitor, it seems to work fine Because when I read the tag, it shows me the correct UID string, e.g.:
IaxeEXNUpRUhqfbyW78LtyoRbQw1
They are the same size. So something is going wrong when executing the following code in Arduino :
byte buffer[28];
if(Serial.available()>0)
{
Serial.readBytes(buffer, 28); //UID is 28 bits long
}
In Android I send the string by doing this:
public void SendUID(String s){
byte[] bytesOut = s.getBytes();
serialPort.write(bytesOut );
tvAppend(textView, "\nData Sent : " + uid + "\n");
}
Is anyone familiar with this problem?
thank you.
PS: This is my first post so sorry if I'm not being clear enough
