RFID + pHAT not detected on I2C

Qwiic System
1

Hello,

I am trying to get your RFID Qwiic + ID-12LA sensor working and I’ve come upon a problem.

I have I2C enabled, I have the libraries downloaded. I have the example python code from Git hub… but running the code gets me the following error message “SparkFun Qwiic RFID reader example 1, error connecting to Device: 13, [Errno 121] Remote I/O error”

So I ran “sudo i2cdetect -y 1” and that came back with the grid of addresses… but it’s all empty.

The RFID board’s pwr LED is on, and when I bring a card to it, the blue light flashes.

One possible reason is the INT connection. Reading through the “SparkFun Qwiic RFID-IDXXLA Hookup Guide” it shows the reader connected to a RedBoard with the Qwwic cable, but also a wire soldered on the INT pin from the reader, connected to pin 8 on the RedBoard.

I am using the Qwiic pHAT with the Raspberry Pi 4… so do I still need to connect the INT pin to something on the Pi? If so, where?

And if not… any help getting the reader to be recognized would be great.

Thanks!

2

The INT isn’t required for it to show up on i2c; try this example https://github.com/sparkfun/Qwiic_RFID_ … address.py and see if it appears with a non-default address? Is anything else connected to the Pi’s i2c bus?

3

Hi,

thanks for the reply. I tried running this code, but had the same result: “Error connecting to device: 13, [Errno 121] Remote I/O error. The qwiic RFID reader isn’t connected to the system. Please check your connection.”

Right now, I only have the Qwiic pHAT (V2) on the Pi, and the RFID reader attached to it.

The RFID reader has pins I could solder wires to the Pi… would that be worth trying?

Would it be as straightforward as: RFID SDA pin to Pi SDA pin (3), RFID SCL pin to Pi SCL pin (5), 3.3v to Pi pin 1, GRN to Pi pin 9?

Thanks!

4

So, I just realized I have another qwiic compatible sensor (Adafruit LIS3DH Triple-Axis Accelerometer https://www.adafruit.com/product/2809)

I plugged that into the pHAT, ran “sudo i2cdetect -y 1” in the terminal, and it showed up. I tried daisy chaining the RFID reader to it, just for fun, but still only one device was detected.