125Khz RFID module UART - not transmitting data

Support Seeed Studio
1

Hi,

I’m unable to get any serial data from this module despite making a number of attempts using an Arduino Uno Wifi.

Here is one code example:

int serialdata;

void setup()
{
  Serial.begin(9600);
  Serial.println("ready");
}
void loop() 
{
  if (Serial.available() > 0) {
    serialdata = Serial.read();
    Serial.println(serialdata);
  }
}

Pin connections:
RFID antenna connected with red connector on P2-Pin2
RFID module P1-Pin1(tx) connected to Arduino Digital 0(rx)
RFID module P1-Pin4(gnd) connected to Arduino Power (gnd)
RFID module P1-Pin5(+5v) connected to Arduino Power (5v)

Please help? or is this a faulty module?

2

Hi Nicolas,

Let’s get this figured out! Before we press on, can you share a URL to the product you are referring to?

3

Hi Graham,

SKU: SS113990014

Regards,
Nicolas

4

Hey, @Nicolas41340,
These are coil antennas - you need to connect both of the antenna wires to the P2 connector for the antenna to work. Polarity is not important.

Hope that sorts it! :smiley:

When you’re using your RFID tag, you get the best range if the tag’s coil is parallel with the RFID module’s coil - like stacking plates.

5

Hi Michael,

I do have both connected, as it is a single plug and can not be separated I was just pointing out which way around it was connected.

So, still no good.

6

Ah right, it sounded like you had only one side connected.
If that’s the case then reply to your order confirmation email, linking this forum post and we’ll get it sorted out.