ESP32 RDM6300 RFID Reader Module

Code Examples

Below you can find code examples of RDM6300 RFID Reader Module with ESP32 in several frameworks:

• Arduino IDE
• ESP-IDF
• ESPHome
• PlatformIO
• MicroPython

If you encounter issues while using the RDM6300 RFID Reader Module, check the Common Issues Troubleshooting Guide.

ESP32 RDM6300 Arduino IDE Code Example

Example in Arduino IDE

Fill in your main Arduino IDE sketch file with the following code to use the RDM6300 RFID Reader Module:

#include <SoftwareSerial.h>

#define RX_PIN 10
#define TX_PIN 11
SoftwareSerial rfid(RX_PIN, TX_PIN);

void setup() {
    Serial.begin(115200);
    rfid.begin(9600);
    Serial.println("RDM6300 initialized. Waiting for RFID tags...");
}

void loop() {
    if (rfid.available() > 0) {
        String tag = "";
        while (rfid.available() > 0) {
            char c = rfid.read();
            tag += c;
        }
        Serial.print("Tag detected: ");
        Serial.println(tag);
    }
    delay(500);
}

This Arduino sketch interfaces with the RDM6300 module over UART using SoftwareSerial. The `setup` function initializes the UART communication, and the `loop` reads incoming tag data and prints it to the Serial Monitor. The code captures the entire tag UID transmitted by the module and displays it for further use.

Connect your ESP32 to your computer via a USB cable, Ensure the correct Board and Port are selected under Tools, Click the "Upload" button in the Arduino IDE to compile and upload the code to your ESP32.

ESP32 RDM6300 ESP-IDF Code Example

Example in Espressif IoT Framework (ESP-IDF)

If you're using ESP-IDF to work with the RDM6300 RFID Reader Module, here's how you can set it up and read data from the sensor. Fill in this code in the main ESP-IDF file:

#include <stdio.h>
#include "driver/uart.h"
#include "freertos/task.h"

#define RX_PIN 16
#define TX_PIN 17
#define UART_PORT UART_NUM_1

void init_uart() {
    uart_config_t uart_config = {
        .baud_rate = 9600,
        .data_bits = UART_DATA_8_BITS,
        .parity = UART_PARITY_DISABLE,
        .stop_bits = UART_STOP_BITS_1,
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE
    };

    uart_param_config(UART_PORT, &uart_config);
    uart_set_pin(UART_PORT, TX_PIN, RX_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    uart_driver_install(UART_PORT, 1024, 0, 0, NULL, 0);
}

void app_main() {
    init_uart();
    printf("RDM6300 initialized. Waiting for tags...\n");

    while (true) {
        char data[128];
        int len = uart_read_bytes(UART_PORT, data, sizeof(data) - 1, 100 / portTICK_PERIOD_MS);
        if (len > 0) {
            data[len] = '\0';
            printf("Tag detected: %s\n", data);
        }
        vTaskDelay(pdMS_TO_TICKS(500));
    }
}

This ESP-IDF code configures a UART interface to communicate with the RDM6300 module. The `init_uart` function initializes the UART peripheral, and the `app_main` function continuously reads incoming tag data. The tag UID is logged to the console, making it suitable for integration into access control or identification systems.

Update the I2C pins (I2C_MASTER_SDA_IO and I2C_MASTER_SCL_IO) to match your ESP32 hardware setup, Use idf.py build to compile the project, Use idf.py flash to upload the code to your ESP32.

ESP32 RDM6300 ESPHome Code Example

Example in ESPHome (Home Assistant)

Fill in this configuration in your ESPHome YAML configuration file (example.yml) to integrate the RDM6300 RFID Reader Module

uart:
  tx_pin: GPIO17
  rx_pin: GPIO16
  baud_rate: 9600

sensor:
  - platform: custom
    lambda: |-
      return {nullptr};
    sensors:
      - name: "RFID Tag UID"

binary_sensor:
  - platform: template
    name: "Tag Detected"

This ESPHome configuration sets up UART communication with the RDM6300 using GPIO17 (TX) and GPIO16 (RX). A custom sensor is defined for capturing tag UID data, and a binary sensor indicates when a tag is detected. This setup can be extended to trigger automations based on the detected tag.

Upload this code to your ESP32 using the ESPHome dashboard or the esphome run command.

ESP32 RDM6300 PlatformIO Code Example

Example in PlatformIO Framework

For PlatformIO, make sure to configure the platformio.ini file with the appropriate environment and libraries, and then proceed with the code.

Configure platformio.ini

First, your platformio.ini should look like below. You might need to include some libraries as shown. Make sure to change the board to your ESP32:

[env:rdm6300]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200

ESP32 RDM6300 PlatformIO Example Code

Write this code in your PlatformIO project under the src/main.cpp file to use the RDM6300 RFID Reader Module:

#include <HardwareSerial.h>

HardwareSerial rfid(1);

void setup() {
    Serial.begin(115200);
    rfid.begin(9600, SERIAL_8N1, 16, 17); // RX, TX
    Serial.println("RDM6300 initialized. Waiting for tags...");
}

void loop() {
    if (rfid.available() > 0) {
        String tag = "";
        while (rfid.available() > 0) {
            char c = rfid.read();
            tag += c;
        }
        Serial.print("Tag detected: ");
        Serial.println(tag);
    }
    delay(500);
}

This PlatformIO code initializes a UART interface to communicate with the RDM6300 module. Incoming RFID tag data is read and displayed on the Serial Monitor. The `loop` function continuously checks for tag data and handles its output, making it suitable for quick prototyping or integration into other systems.

Upload the code to your ESP32 using the PlatformIO "Upload" button in your IDE or the pio run --target upload command.

ESP32 RDM6300 MicroPython Code Example

Example in Micro Python Framework

Fill in this script in your MicroPython main.py file (main.py) to integrate the RDM6300 RFID Reader Module with your ESP32.

from machine import UART, Pin
import time

# Initialize UART
uart = UART(2, baudrate=9600, tx=17, rx=16)

print("RDM6300 initialized. Waiting for tags...")

while True:
    if uart.any():
        tag = uart.read().decode('utf-8')
        print("Tag detected:", tag)
    time.sleep(0.5)

This MicroPython code sets up UART communication with the RDM6300 RFID module. The script continuously listens for incoming RFID tag data and prints the UID to the console. The simplicity of the code makes it ideal for quick prototyping or integration into identification projects.

Upload this code to your ESP32 using a MicroPython-compatible IDE, such as Thonny, uPyCraft, or tools like ampy.