diff --git a/subghz/apps/princeton-send/README.md b/subghz/apps/princeton-send/README.md
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+# Princeton Sender
+
+This is a demo application that sends a Princeton 24-bit code using the internal radio, then
+it sends a 24-bit code using an external radio. It also enables the 5v pin for the external
+radio, in case the radio has a 5-volt to 3.3-volt regulator attached.
+
+There is no UI for this project, it just sends the two signals and then exits. Hopefully you
+can borrow this code for other projects, such as sending a beacon on a time interval.
diff --git a/subghz/apps/princeton-send/application.fam b/subghz/apps/princeton-send/application.fam
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+++ b/subghz/apps/princeton-send/application.fam
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+App(
+    appid="princeton_send",
+    name="Princeton Sender",
+    apptype=FlipperAppType.EXTERNAL,
+    entry_point="princeton_send_app",
+    requires=["gui", "subghz"],
+    stack_size=2 * 1024,
+    fap_icon="princeton_send.png",
+    fap_category="Sub-GHz",
+)
diff --git a/subghz/apps/princeton-send/princeton_send.c b/subghz/apps/princeton-send/princeton_send.c
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+++ b/subghz/apps/princeton-send/princeton_send.c
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+#include <furi.h>
+#include <lib/subghz/transmitter.h>
+#include <applications/drivers/subghz/cc1101_ext/cc1101_ext_interconnect.h>
+#include <lib/subghz/devices/cc1101_int/cc1101_int_interconnect.h>
+#include <flipper_format/flipper_format_i.h>
+#include <lib/subghz/protocols/protocol_items.h>
+#include <lib/subghz/devices/devices.h>
+
+static void subghz_radio_device_power_on() {
+    uint8_t attempts = 5;
+    while(--attempts > 0) {
+        if(furi_hal_power_enable_otg()) break;
+        furi_delay_ms(50);
+    }
+}
+
+static void subghz_radio_device_power_off() {
+    if(furi_hal_power_is_otg_enabled()) furi_hal_power_disable_otg();
+}
+
+static void
+    set_princeton(FlipperFormat* flipper_format, uint32_t key, uint32_t te, uint32_t repeat) {
+    FuriString* princeton_settings = furi_string_alloc_printf(
+        "Protocol: Princeton\n"
+        "Bit: 24\n"
+        "Key: 00 00 00 00 00 %02X %02X %02X\n"
+        "TE: %lu\n"
+        "Repeat: %lu\n",
+        (uint8_t)((key >> 16) & 0xFFU),
+        (uint8_t)((key >> 8) & 0xFFU),
+        (uint8_t)(key & 0xFFU),
+        te,
+        repeat);
+    Stream* stream = flipper_format_get_raw_stream(flipper_format);
+    stream_clean(stream);
+    stream_write_cstring(stream, furi_string_get_cstr(princeton_settings));
+    stream_seek(stream, 0, StreamOffsetFromStart);
+    furi_string_free(princeton_settings);
+}
+
+static void send_princeton(uint32_t key, bool use_external_radio) {
+    uint32_t frequency = 433920000;
+    uint32_t te = 350;
+    uint32_t repeat = 5;
+    bool enable_5v = use_external_radio;
+    const SubGhzDevice* device;
+
+    subghz_devices_init();
+    if(use_external_radio) {
+        if(enable_5v) {
+            subghz_radio_device_power_on();
+        }
+        device = subghz_devices_get_by_name(SUBGHZ_DEVICE_CC1101_EXT_NAME);
+    } else {
+        device = subghz_devices_get_by_name(SUBGHZ_DEVICE_CC1101_INT_NAME);
+    }
+
+    SubGhzEnvironment* environment = subghz_environment_alloc();
+    subghz_environment_set_protocol_registry(environment, (void*)&subghz_protocol_registry);
+    SubGhzTransmitter* transmitter = subghz_transmitter_alloc_init(environment, "Princeton");
+    FlipperFormat* flipper_format = flipper_format_string_alloc();
+    set_princeton(flipper_format, key, te, repeat);
+    subghz_transmitter_deserialize(transmitter, flipper_format);
+    subghz_devices_begin(device);
+    subghz_devices_reset(device);
+    subghz_devices_load_preset(device, FuriHalSubGhzPresetOok650Async, NULL);
+    frequency = subghz_devices_set_frequency(device, frequency);
+
+    // Send
+    furi_hal_power_suppress_charge_enter();
+    if(subghz_devices_start_async_tx(device, subghz_transmitter_yield, transmitter)) {
+        while(!(subghz_devices_is_async_complete_tx(device))) {
+            furi_delay_ms(100);
+        }
+
+        subghz_devices_stop_async_tx(device);
+    }
+
+    // Cleanup
+    subghz_devices_sleep(device);
+    subghz_devices_end(device);
+    subghz_devices_deinit();
+    if(enable_5v) {
+        subghz_radio_device_power_off();
+    }
+    furi_hal_power_suppress_charge_exit();
+    flipper_format_free(flipper_format);
+    subghz_transmitter_free(transmitter);
+    subghz_environment_free(environment);
+}
+
+int princeton_send_app(char* p) {
+    UNUSED(p);
+
+    FURI_LOG_I("princeton_send", "Sending key with internal radio...");
+    send_princeton(0x938475, false);
+    FURI_LOG_I("princeton_send", "Sent key.");
+
+    FURI_LOG_I("princeton_send", "Sending key with external radio...");
+    send_princeton(0x194857, true);
+    FURI_LOG_I("princeton_send", "Sent key?");
+
+    return 0;
+}
\ No newline at end of file
diff --git a/subghz/apps/princeton-send/princeton_send.png b/subghz/apps/princeton-send/princeton_send.png
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