diff --git a/Production/Firmware/aic_pico.uf2 b/Production/Firmware/aic_pico.uf2
index daf1570..e7afd9c 100644
Binary files a/Production/Firmware/aic_pico.uf2 and b/Production/Firmware/aic_pico.uf2 differ
diff --git a/firmware/src/CMakeLists.txt b/firmware/src/CMakeLists.txt
index 457b636..2517e1d 100644
--- a/firmware/src/CMakeLists.txt
+++ b/firmware/src/CMakeLists.txt
@@ -12,7 +12,7 @@ function(make_firmware board board_def)
     endif()
 
     add_executable(${board}
-                   main.c save.c config.c commands.c light.c keypad.c
+                   main.c save.c config.c commands.c light.c keypad.c cardio.c
                    cst816t.c st7789.c gui.c gfx.c rle.c
                    cli.c usb_descriptors.c)
     target_compile_definitions(${board} PUBLIC ${board_def})
diff --git a/firmware/src/cardio.c b/firmware/src/cardio.c
new file mode 100644
index 0000000..f700e89
--- /dev/null
+++ b/firmware/src/cardio.c
@@ -0,0 +1,214 @@
+/*
+ * Cardio processing and auto PIN-entry
+ * WHowe <github.com/whowechina>
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "tusb.h"
+#include "usb_descriptors.h"
+
+#include "board_defs.h"
+
+#include "nfc.h"
+#include "gui.h"
+#include "light.h"
+
+#define LAST_CARD_TIMEOUT_US 30000000
+
+static struct {
+    uint8_t current[9];
+    uint8_t reported[9];
+    uint64_t report_time;
+} hid_cardio;
+
+static struct {
+    uint8_t uid_len;
+    uint8_t uid[8];
+    uint64_t time;
+} last_card;
+
+static struct {
+    bool active;
+    uint8_t seq_len; // not pin length
+    uint8_t index;
+    struct {
+        uint8_t key;
+        uint8_t duration; // in cycles, most cases 1 cycle = 1ms
+    } seq[32];
+    uint64_t pin_time;
+} autopin_ctx;
+
+void cardio_report_cardio()
+{
+    if (!tud_hid_ready()) {
+        return;
+    }
+
+    uint64_t now = time_us_64();
+
+    if ((memcmp(hid_cardio.current, hid_cardio.reported, 9) != 0) &&
+        (now - hid_cardio.report_time > 1000000)) {
+
+        tud_hid_n_report(0x00, hid_cardio.current[0], hid_cardio.current + 1, 8);
+        memcpy(hid_cardio.reported, hid_cardio.current, 9);
+        hid_cardio.report_time = now;
+    }
+}
+
+static void start_autopin(const char *pin, uint8_t delay)
+{
+    const char *keymap = KEYPAD_NKRO_MAP;
+    autopin_ctx.active = true;
+    autopin_ctx.index = 0;
+    autopin_ctx.seq_len = strlen(pin);
+    autopin_ctx.pin_time = time_us_64() + delay * 1000000;
+
+    for (int i = 0; i < autopin_ctx.seq_len; i++) {
+        int key = pin[i] - '0';
+        int code = (key > 0) ? keymap[key - 1] : keymap[9];
+        autopin_ctx.seq[i].key = code;
+        autopin_ctx.seq[i].duration = 150;
+    }
+}
+
+static void check_autopin()
+{
+    if (!aic_cfg->autopin.enabled) {
+        return;
+    }
+
+    for (int i = 0; i < 4; i++) {
+        if (aic_cfg->autopin.entries[i].uidlen != last_card.uid_len) {
+            continue;
+        }
+
+        if (memcmp(aic_cfg->autopin.entries[i].uid, last_card.uid, last_card.uid_len) != 0) {
+            continue;
+        }
+
+        printf(" (Auto PIN-entry)");
+        start_autopin(aic_cfg->autopin.entries[i].pin, aic_cfg->autopin.entries[i].delay);
+
+        break;
+    }
+}
+
+int cardio_get_pin_key()
+{
+    if (!aic_cfg->autopin.enabled || !autopin_ctx.active) {
+        return -1;
+    }
+
+    if (time_us_64() < autopin_ctx.pin_time) {
+        return -1;
+    }
+
+    if (autopin_ctx.index >= autopin_ctx.seq_len) {
+        autopin_ctx.active = false;
+        return -1;
+    }
+
+    int key = autopin_ctx.seq[autopin_ctx.index].key;
+    if (autopin_ctx.seq[autopin_ctx.index].duration > 0) {
+        autopin_ctx.seq[autopin_ctx.index].duration--;
+    } else {
+        autopin_ctx.index++;
+    }
+
+    return key;
+}
+
+static void update_cardio(nfc_card_t *card)
+{
+    switch (card->card_type) {
+        case NFC_CARD_MIFARE:
+            hid_cardio.current[0] = REPORT_ID_EAMU;
+            hid_cardio.current[1] = 0xe0;
+            hid_cardio.current[2] = 0x04;
+            if (card->len == 4) {
+                memcpy(hid_cardio.current + 3, card->uid, 4);
+                memcpy(hid_cardio.current + 7, card->uid, 2);
+            } else if (card->len == 7) {
+                memcpy(hid_cardio.current + 3, card->uid + 1, 6);
+            }
+            break;
+        case NFC_CARD_FELICA:
+            hid_cardio.current[0] = REPORT_ID_FELICA;
+            memcpy(hid_cardio.current + 1, card->uid, 8);
+           break;
+        case NFC_CARD_VICINITY:
+            hid_cardio.current[0] = REPORT_ID_EAMU;
+            memcpy(hid_cardio.current + 1, card->uid, 8);
+            break;
+        default:
+            memset(hid_cardio.current, 0, 9);
+            return;
+    }
+
+    last_card.time = time_us_64();
+    last_card.uid_len = card->len;
+    memcpy(last_card.uid, card->uid, 8);
+
+    gui_report_card_id(hid_cardio.current + 1, 8, true);
+    printf(" -> CardIO ");
+    for (int i = 1; i < 9; i++) {
+        printf("%02X", hid_cardio.current[i]);
+    }
+
+    check_autopin();
+}
+
+void cardio_run(bool hid_light)
+{
+    static nfc_card_t old_card = { 0 };
+
+    nfc_rf_field(true);
+    nfc_card_t card = nfc_detect_card();
+    if (card.card_type != NFC_CARD_NONE) {
+        nfc_identify_last_card();
+        gui_report_card_id(card.uid, card.len, false);
+    }
+    nfc_rf_field(false);
+
+    if (memcmp(&old_card, &card, sizeof(old_card)) == 0) {
+        return;
+    }
+
+    old_card = card;
+
+    if (!hid_light) {
+        if (card.card_type != NFC_CARD_NONE) {
+            light_rainbow(30, 0, aic_cfg->light.level_active);
+        } else {
+            light_rainbow(1, 3000, aic_cfg->light.level_idle);
+        }
+    }
+
+    display_card(&card);
+    update_cardio(&card);
+}
+
+void cardio_clear()
+{
+    memset(hid_cardio.current, 0, 9);
+    memset(&autopin_ctx, 0, sizeof(autopin_ctx));
+}
+
+bool cardio_get_last(uint8_t uid[8], uint8_t *len)
+{
+    if (time_us_64() - last_card.time > LAST_CARD_TIMEOUT_US) {
+        return false;
+    }
+
+    if (last_card.uid_len == 0) {
+        return false;
+    }
+
+    *len = last_card.uid_len;
+    memcpy(uid, last_card.uid, last_card.uid_len);
+
+    return true;
+}
diff --git a/firmware/src/cardio.h b/firmware/src/cardio.h
new file mode 100644
index 0000000..ca0f135
--- /dev/null
+++ b/firmware/src/cardio.h
@@ -0,0 +1,15 @@
+/*
+ * Cardio processing and auto PIN-entry
+ * WHowe <github.com/whowechina>
+ */
+
+#ifndef CARDIO_H
+#define CARDIO_H
+
+void cardio_run(bool hid_light);
+void cardio_clear();
+void cardio_report_cardio();
+bool cardio_get_last(uint8_t uid[8], uint8_t *len);
+int cardio_get_pin_key();
+
+#endif
\ No newline at end of file
diff --git a/firmware/src/commands.c b/firmware/src/commands.c
index ac55a01..1382b0f 100644
--- a/firmware/src/commands.c
+++ b/firmware/src/commands.c
@@ -17,6 +17,8 @@
 #include "bana.h"
 #include "nfc.h"
 
+#include "cardio.h"
+
 static int fps[2];
 void fps_count(int core)
 {
@@ -71,6 +73,30 @@ static void display_reader()
     }
 }
 
+static void disp_list()
+{
+    for (int i = 0; i < 4; i++) {
+        printf("    SLOT %d:", i);
+        if (aic_cfg->autopin.entries[i].uidlen == 0) {
+            printf(" Empty\n");
+            continue;
+        }
+        printf(" UID: ");
+        for (int j = 0; j < aic_cfg->autopin.entries[i].uidlen; j++) {
+            printf("%02x", aic_cfg->autopin.entries[i].uid[j]);
+        }
+        printf(" PIN: %.15s", aic_cfg->autopin.entries[i].pin);
+        printf(" Delay: %ds\n", aic_cfg->autopin.entries[i].delay);
+    }
+}
+
+static void display_autopin()
+{
+    printf("[AUTO PIN-Entry]\n");
+    printf("    Status: %s\n", aic_cfg->autopin.enabled ? "ON" : "OFF");
+    disp_list();
+}
+
 static void display_warning()
 {
     if (keypad_is_stuck()) {
@@ -84,6 +110,7 @@ static void handle_display()
     display_light();
     display_lcd();
     display_reader();
+    display_autopin();
     display_warning();
 }
 
@@ -253,6 +280,137 @@ static void handle_lcd(int argc, char *argv[])
     display_lcd();
 }
 
+static void autopin_onoff(bool on)
+{
+    aic_cfg->autopin.enabled = on;
+    config_changed();
+    printf("Auto Pin-entry: %s\n", on ? "ON" : "OFF");
+}
+
+static void autopin_delete(int argc, char *argv[])
+{
+    const char *usage = "Usage: autopin delete <SLOT>\n"
+                        "  SLOT: [0..3], all";
+    if (argc != 1) {
+        printf("%s", usage);
+        return;
+    }
+
+    const char *slots[] = { "0", "1", "2", "3", "all" };
+    int match = cli_match_prefix(slots, 5, argv[0]);
+    if (match < 0) {
+        printf("%s", usage);
+        return;
+    }
+    if (match == 4) {
+        memset(&aic_cfg->autopin.entries, 0, sizeof(aic_cfg->autopin.entries));
+        printf("All slots cleared.\n");
+    } else {
+        memset(&aic_cfg->autopin.entries[match], 0,
+               sizeof(aic_cfg->autopin.entries[match]));
+        printf("Slot %d cleared.\n", match);
+    }
+    config_changed();
+}
+
+static int find_slot(const uint8_t uid[8], uint8_t uidlen)
+{
+    int slot = -1;
+    for (int i = 0; i < 4; i++) {
+        if ((aic_cfg->autopin.entries[i].uidlen == uidlen) &&
+            (memcmp(aic_cfg->autopin.entries[i].uid, uid, uidlen) == 0)) {
+            return i;
+        }
+        if ((slot < 0) && (aic_cfg->autopin.entries[i].uidlen == 0)) {
+            slot = i;
+        }
+    }
+    return slot;
+}
+
+static void autopin_add(int argc, char *argv[])
+{
+    const char *usage = "Usage: autopin add <PIN> <DELAY>\n"
+                        "  PIN: 4 digits\n"
+                        "  DELAY: [0..99] seconds\n";
+    if (argc != 2) {
+        printf("%s", usage);
+        return;
+    }
+
+    uint8_t uid[8];
+    uint8_t uidlen;    
+    if (!cardio_get_last(uid, &uidlen)) {
+        printf("No card detected.\n");
+        return;
+    }
+
+    int slot = find_slot(uid, uidlen);
+    if (slot < 0) {
+        printf("No empty slots available.\n");
+        return;
+    }
+
+    int delay = cli_extract_non_neg_int(argv[1], 0);
+    if (delay < 0 || delay > 99) {
+        printf("%s", usage);
+        return;
+    }
+
+    if (strlen(argv[0]) != 4) {
+        printf("PIN must be 4 digits.\n");
+        return;
+    }
+
+    for (int i = 0; i < 4; i++) {
+        if (isdigit((int)argv[0][i]) == 0) {
+            printf("PIN must be 4 digits.\n");
+            return;
+        }
+    }
+
+    strcpy(aic_cfg->autopin.entries[slot].pin, argv[0]);
+    aic_cfg->autopin.entries[slot].delay = delay;
+
+    config_changed();
+    printf("Added to slot %d.\n", slot);
+    disp_list();
+}
+
+static void handle_autopin(int argc, char *argv[])
+{
+    const char *usage = "Usage: autopin <on|off>\n"
+                        "       autopin list\n"
+                        "       autopin delete <SLOT>\n"
+                        "       autopin add <PIN> <DELAY>\n";
+    if (argc < 1) {
+        printf("%s", usage);
+        return;
+    }
+
+    const char *commands[] = { "on", "off", "list", "delete", "add" };
+    int match = cli_match_prefix(commands, 5, argv[0]);
+    if ((match == 0) || (match == 1)) {
+        if (argc == 1) {
+            autopin_onoff(match == 0);
+            return;
+        }
+    } else if (match == 2) {
+        if (argc == 1) {
+            disp_list();
+            return;
+        }
+    } else if (match == 3) {
+        autopin_delete(argc - 1, argv + 1);
+        return;
+    } else if (match == 4) {
+        autopin_add(argc - 1, argv + 1);
+        return;
+    }
+
+    printf("%s", usage);
+}
+
 static void handle_pn5180_tweak(int argc, char *argv[])
 {
     const char *usage = "Usage: pn5180_tweak <on|off>\n";
@@ -290,6 +448,7 @@ void commands_init()
     cli_register("light", handle_light, "Turn on/off lights.");
     cli_register("level", handle_level, "Set light level.");
     cli_register("lcd", handle_lcd, "Touch LCD settings.");
+    cli_register("autopin", handle_autopin, "Auto pin-entry.");
     cli_register("pn5180_tweak", handle_pn5180_tweak, "PN5180 TX tweak.");
     cli_register("debug", handle_debug, "Toggle debug.");
 }
diff --git a/firmware/src/config.h b/firmware/src/config.h
index 93f5a36..13e333f 100644
--- a/firmware/src/config.h
+++ b/firmware/src/config.h
@@ -27,7 +27,17 @@ typedef struct __attribute__((packed)) {
     } lcd;
     struct {
         bool pn5180_tx;
+        uint8_t reserved[7];
     } tweak;
+    struct {
+        struct {
+            uint8_t uidlen;
+            uint8_t delay;
+            uint8_t uid[8];
+            char pin[16];
+        } entries[4];
+        bool enabled;
+    } autopin;
     uint32_t reserved;
 } aic_cfg_t;
 
diff --git a/firmware/src/main.c b/firmware/src/main.c
index 77ed48c..04f7597 100644
--- a/firmware/src/main.c
+++ b/firmware/src/main.c
@@ -33,35 +33,13 @@
 #include "config.h"
 #include "cli.h"
 #include "commands.h"
+#include "cardio.h"
 #include "light.h"
 #include "keypad.h"
 #include "gui.h"
 
 #define DEBUG(...) if (aic_runtime.debug) printf(__VA_ARGS__)
 
-static struct {
-    uint8_t current[9];
-    uint8_t reported[9];
-    uint64_t report_time;
-} hid_cardio;
-
-void report_hid_cardio()
-{
-    if (!tud_hid_ready()) {
-        return;
-    }
-
-    uint64_t now = time_us_64();
-
-    if ((memcmp(hid_cardio.current, hid_cardio.reported, 9) != 0) &&
-        (now - hid_cardio.report_time > 1000000)) {
-
-        tud_hid_n_report(0x00, hid_cardio.current[0], hid_cardio.current + 1, 8);
-        memcpy(hid_cardio.reported, hid_cardio.current, 9);
-        hid_cardio.report_time = now;
-    }
-}
-
 struct __attribute__((packed)) {
     uint8_t modifier;
     uint8_t keymap[15];
@@ -69,6 +47,11 @@ struct __attribute__((packed)) {
 
 static const char keymap[12] = KEYPAD_NKRO_MAP;
 
+static inline void set_nkro_bit(uint8_t code)
+{
+    hid_nkro.keymap[code / 8] |= (1 << (code % 8));
+}
+
 void report_hid_key()
 {
     if (!tud_hid_ready()) {
@@ -77,28 +60,30 @@ void report_hid_key()
 
     uint16_t keys = aic_runtime.touch ? gui_keypad_read() : keypad_read();
 
+    memset(&hid_nkro, 0, sizeof(hid_nkro));
     for (int i = 0; i < keypad_key_num(); i++) {
-        uint8_t code = keymap[i];
-        uint8_t byte = code / 8;
-        uint8_t bit = code % 8;
-        if (keys & (1 << i)) {
-            hid_nkro.keymap[byte] |= (1 << bit);
-        } else {
-            hid_nkro.keymap[byte] &= ~(1 << bit);
+       if (keys & (1 << i)) {
+            set_nkro_bit(keymap[i]);
         }
     }
+
+    int auto_pin_key = cardio_get_pin_key();
+    if (auto_pin_key > 0) {
+        set_nkro_bit(auto_pin_key);
+    }
+
     tud_hid_n_report(1, 0, &hid_nkro, sizeof(hid_nkro));
 }
 
 void report_usb_hid()
 {
-    report_hid_cardio();
+    cardio_report_cardio();
     report_hid_key();
 }
 
 static uint64_t last_hid_time = 0;
 
-static bool hid_is_active()
+static bool hid_light_is_active()
 {
     if (last_hid_time == 0) {
         return false;
@@ -114,7 +99,7 @@ static bool reader_is_active()
 static void light_mode_update()
 {
     static bool was_cardio = true;
-    bool cardio = !reader_is_active() && !hid_is_active();
+    bool cardio = !reader_is_active() && !hid_light_is_active();
     static uint8_t last_level;
     bool level_changed = (last_level != aic_cfg->light.level_idle);
 
@@ -161,75 +146,6 @@ void card_name_update_cb(nfc_card_name card_name)
     gui_report_card_name(card_name);
 }
 
-static void update_cardio(nfc_card_t *card)
-{
-    switch (card->card_type) {
-        case NFC_CARD_MIFARE:
-            hid_cardio.current[0] = REPORT_ID_EAMU;
-            hid_cardio.current[1] = 0xe0;
-            hid_cardio.current[2] = 0x04;
-            if (card->len == 4) {
-                memcpy(hid_cardio.current + 3, card->uid, 4);
-                memcpy(hid_cardio.current + 7, card->uid, 2);
-            } else if (card->len == 7) {
-                memcpy(hid_cardio.current + 3, card->uid + 1, 6);
-            }
-            break;
-        case NFC_CARD_FELICA:
-            hid_cardio.current[0] = REPORT_ID_FELICA;
-            memcpy(hid_cardio.current + 1, card->uid, 8);
-           break;
-        case NFC_CARD_VICINITY:
-            hid_cardio.current[0] = REPORT_ID_EAMU;
-            memcpy(hid_cardio.current + 1, card->uid, 8);
-            break;
-        default:
-            memset(hid_cardio.current, 0, 9);
-            return;
-    }
-
-    gui_report_card_id(hid_cardio.current + 1, 8, true);
-    printf(" -> CardIO ");
-    for (int i = 1; i < 9; i++) {
-        printf("%02X", hid_cardio.current[i]);
-    }
-}
-
-static void cardio_run()
-{
-    if (aime_is_active() || bana_is_active()) {
-        memset(hid_cardio.current, 0, 9);
-        return;
-    }
-
-    static nfc_card_t old_card = { 0 };
-
-    nfc_rf_field(true);
-    nfc_card_t card = nfc_detect_card();
-    if (card.card_type != NFC_CARD_NONE) {
-        nfc_identify_last_card();
-        gui_report_card_id(card.uid, card.len, false);
-    }
-    nfc_rf_field(false);
-
-    if (memcmp(&old_card, &card, sizeof(old_card)) == 0) {
-        return;
-    }
-
-    old_card = card;
-
-    if (!reader_is_active() && !hid_is_active()) {
-        if (card.card_type != NFC_CARD_NONE) {
-            light_rainbow(30, 0, aic_cfg->light.level_active);
-        } else {
-            light_rainbow(1, 3000, aic_cfg->light.level_idle);
-        }
-    }
-
-    display_card(&card);
-    update_cardio(&card);
-}
-
 const int reader_intf = 1;
 static struct {
     uint8_t buf[64];
@@ -348,8 +264,14 @@ static void core0_loop()
 
         cli_run();
         reader_run();
-        cardio_run();
 
+        if (reader_is_active()) {
+            cardio_clear();
+        }
+        else {
+            cardio_run(hid_light_is_active());
+        }
+        
         keypad_update();
         report_usb_hid();