RDM6300 RFID Reader Module

// The RDM6300 sends each tag as a 14-byte ASCII frame over UART (9600 baud):
// STX(0x02) + 10 hex chars (2 version + 8 tag ID) + 2 checksum chars + ETX(0x03)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/uart.h"

#define RX_PIN 16 // Reader TX -> GPIO16; TX to the reader is not needed
#define UART_PORT UART_NUM_1

void init_uart(void) {
    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, UART_PIN_NO_CHANGE, RX_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    uart_driver_install(UART_PORT, 1024, 0, 0, NULL, 0);
}

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

    uint8_t byte;
    uint8_t frame[13];

    while (true) {
        // Sync on the 0x02 start byte
        if (uart_read_bytes(UART_PORT, &byte, 1, pdMS_TO_TICKS(100)) == 1 && byte == 0x02) {
            int got = uart_read_bytes(UART_PORT, frame, 13, pdMS_TO_TICKS(100));
            if (got == 13 && frame[12] == 0x03) {
                char tag_hex[9];
                memcpy(tag_hex, frame + 2, 8); // skip the 2 version chars
                tag_hex[8] = '\0';
                unsigned long tag_id = strtoul(tag_hex, NULL, 16);
                printf("Tag detected: %s (decimal %lu)\n", tag_hex, tag_id);
            }
        }
    }
}

uart:
  rx_pin: GPIO16  # reader TX -> GPIO16; TX to the reader is not needed
  baud_rate: 9600

rdm6300:
  on_tag:
    - logger.log:
        format: "Tag scanned: %u"
        args: ['x']

binary_sensor:
  - platform: rdm6300
    uid: 7616525  # replace with your tag's ID (see the log line above)
    name: "RDM6300 Known Tag"

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

#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);
}

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)