This question is an exact duplicate of:
Hardware: Arduino UNO R3 Sparkfun qwiic rfid Id-20LA
I followed this tutorial. I used the code on the website. I don't have a qwiic wire so i used standard i2c.
VCC->3.3V GND->GND SDA->A4 SCL->A5 INT->8
I ran it and nothing happens. I removed the if in the loop function to see if that is the problem and it just shows rfid 00000 so it must not be reading. Also i can see the arduino and sparkfun boards pwr led on. The read led on the sparkfun never blinks. I don't know where to look.
Also, unrelated question. If i wanted to read with this setup and after that add a bluetooth send the id tag via bluetooth on an android app. Both bluetooth and rfid would be on software serial. I saw that uno supports only 1 serial at a time. My question. Should i get an arduino Mega?
If something is unclear feel free to ask me.