Here is a list of all variables with links to the structures/unions they belong to:

- u -

• uart_ : esphome::logger::Logger, esphome::midea::UARTStream
• uart_event_queue_ : esphome::uart::IDFUARTComponent
• uart_num_ : esphome::improv_serial::ImprovSerialComponent, esphome::logger::Logger, esphome::uart::IDFUARTComponent
• uart_presence_active_ : esphome::dfrobot_sen0395::DfrobotSen0395Component
• ud_pin_ : esphome::x9c::X9cOutput
• udp_ : esphome::wled::WLEDLightEffect
• udp_client_ : esphome::udp::UDPComponent, esphome::wake_on_lan::WakeOnLanButton
• udp_socket_running_ : esphome::voice_assistant::VoiceAssistant
• uid_ : esphome::nfc::NfcTag, esphome::nfc::NfcTagBinarySensor, esphome::pn532::PN532BinarySensor, esphome::rc522::RC522BinarySensor
• uid_buffer_ : esphome::rc522::RC522
• uid_idx_ : esphome::rc522::RC522
• unique_id : esphome::api::ListEntitiesAlarmControlPanelResponse, esphome::api::ListEntitiesBinarySensorResponse, esphome::api::ListEntitiesButtonResponse, esphome::api::ListEntitiesCameraResponse, esphome::api::ListEntitiesClimateResponse, esphome::api::ListEntitiesCoverResponse, esphome::api::ListEntitiesDateResponse, esphome::api::ListEntitiesDateTimeResponse, esphome::api::ListEntitiesEventResponse, esphome::api::ListEntitiesFanResponse, esphome::api::ListEntitiesLightResponse, esphome::api::ListEntitiesLockResponse, esphome::api::ListEntitiesMediaPlayerResponse, esphome::api::ListEntitiesNumberResponse, esphome::api::ListEntitiesSelectResponse, esphome::api::ListEntitiesSensorResponse, esphome::api::ListEntitiesSirenResponse, esphome::api::ListEntitiesSwitchResponse, esphome::api::ListEntitiesTextResponse, esphome::api::ListEntitiesTextSensorResponse, esphome::api::ListEntitiesTimeResponse, esphome::api::ListEntitiesUpdateResponse, esphome::api::ListEntitiesValveResponse
• unique_id_generator : esphome::mqtt::MQTTDiscoveryInfo
• unit : esphome::sml::ObisInfo
• unit_ : esphome::anova::AnovaCodec, esphome::remote_base::CanalSatBaseProtocol
• unit_of_measurement : esphome::api::ListEntitiesNumberResponse, esphome::api::ListEntitiesSensorResponse
• unit_of_measurement_ : esphome::EntityBase_UnitOfMeasurement
• units_ : esphome::graph::GraphLegend
• units_setup : esphome::bedjet::BedjetStatusPacket
• universe_consumers_ : esphome::e131::E131Component
• universe_packets_ : esphome::e131::E131Component
• UNKNOWN : esphome::ccs811::CCS811Component, esphome::grove_gas_mc_v2::GroveGasMultichannelV2Component, esphome::scd30::SCD30Component, esphome::sgp30::SGP30Component, esphome::sps30::SPS30Component
• unknown_devices_ : esphome::uponor_smatrix::UponorSmatrixComponent
• unlock_trigger_ : esphome::template_::TemplateLock
• unmute_trigger_ : esphome::speaker::SpeakerMediaPlayer
• unmuted_volume_ : esphome::i2s_audio::I2SAudioMediaPlayer
• unprocessed_probability_status_ : esphome::micro_wake_word::StreamingModel
• unread_ : esphome::online_image::DownloadBuffer
• unused : esphome::pmsa003i::PM25AQIData
• unused01 : esphome::airthings_wave_mini::AirthingsWaveMini::WaveMiniReadings, esphome::airthings_wave_plus::AirthingsWavePlus::WavePlusReadings
• unused02 : esphome::airthings_wave_mini::AirthingsWaveMini::WaveMiniReadings
• unused03 : esphome::airthings_wave_mini::AirthingsWaveMini::WaveMiniReadings
• unused04 : esphome::airthings_wave_mini::AirthingsWaveMini::WaveMiniReadings
• unused1 : esphome::airthings_wave_base::AirthingsWaveBase::AccessControlPointResponse
• unused2 : esphome::airthings_wave_base::AirthingsWaveBase::AccessControlPointResponse
• unused3 : esphome::airthings_wave_base::AirthingsWaveBase::AccessControlPointResponse
• unused4 : esphome::airthings_wave_base::AirthingsWaveBase::AccessControlPointResponse
• unused5 : esphome::airthings_wave_base::AirthingsWaveBase::AccessControlPointResponse
• unused_1 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg
• unused_2 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg
• unused_3 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg, esphome::pcf85063::PCF85063Component::PCF85063Reg, esphome::pcf8563::PCF8563Component::PCF8563Reg
• unused_4 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg
• unused_5 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg
• unused_6 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg
• unused_7 : esphome::bedjet::BedjetStatusPacket, esphome::ds1307::DS1307Component::DS1307Reg
• unused_has_legacy_away : esphome::api::ClimateCommandRequest
• unused_legacy_away : esphome::api::ClimateCommandRequest, esphome::api::ClimateStateResponse
• update_ : esphome::bp1658cj::BP1658CJ, esphome::bp5758d::BP5758D, esphome::max7219digit::MAX7219Component, esphome::mqtt::MQTTUpdateComponent, esphome::my9231::MY9231OutputComponent, esphome::pca9685::PCA9685Output, esphome::sm10bit_base::Sm10BitBase, esphome::sm16716::SM16716, esphome::sm2135::SM2135, esphome::tlc59208f::TLC59208FOutput, esphome::tlc5947::TLC5947, esphome::tlc5971::TLC5971
• update_channel_ : esphome::bp1658cj::BP1658CJ, esphome::bp5758d::BP5758D, esphome::sm10bit_base::Sm10BitBase, esphome::sm2135::SM2135
• update_in_progress_ : esphome::dps310::DPS310Component
• update_info : esphome::update::UpdateEntity
• update_info_ : esphome::update::UpdateEntity
• update_interval : esphome::pid::PIDSimulator
• update_interval_ : esphome::feedback::FeedbackCover, esphome::light::AddressableFireworksEffect, esphome::light::AddressableFlickerEffect, esphome::light::AddressableLambdaLightEffect, esphome::light::LambdaLightEffect, esphome::light::PulseLightEffect, esphome::light::RandomLightEffect, esphome::pmsx003::PMSX003Component, esphome::PollingComponent, esphome::scd30::SCD30Component
• update_interval_min_ : esphome::sds011::SDS011Component
• update_level : esphome::mcp4461::WiperState
• update_phase : esphome::bedjet::BedjetStatusPacket
• update_started_ : esphome::http_request::OtaHttpRequestComponent
• update_task_handle_ : esphome::http_request::HttpRequestUpdate
• update_terminal : esphome::mcp4461::WiperState
• update_time_ : esphome::graph::HistoryData
• update_trigger_ : esphome::touchscreen::Touchscreen
• update_variance_value_ : esphome::combination::KalmanCombinationComponent
• updated : esphome::packet_transport::BinarySensor, esphome::packet_transport::Sensor
• updated_ : esphome::packet_transport::PacketTransport
• updates_ : esphome::Application
• updates_enabled_ : esphome::pn532::PN532
• upload_first_chunk_sent_ : esphome::nextion::Nextion
• UponorSmatrixComponent : esphome::uponor_smatrix::UponorSmatrixDevice
• upper_threshold_ : esphome::analog_threshold::AnalogThresholdBinarySensor
• uptime_ : esphome::uptime::UptimeSecondsSensor, esphome::uptime::UptimeTextSensor
• uri_ : esphome::nfc::NdefRecordUri
• url : esphome::speaker::MediaCallCommand, esphome::speaker::PlaylistItem
• url_ : esphome::http_request::OtaHttpRequestComponent, esphome::online_image::OnlineImage, esphome::web_server_idf::AsyncEventSource
• use_acc_energy_regs_ : esphome::ade7953_base::ADE7953
• use_address_ : esphome::ethernet::EthernetComponent, esphome::wifi::WiFiComponent
• use_alternative_swing_control_ : esphome::haier::Smartair2Climate
• use_apll_ : esphome::i2s_audio::I2SAudioBase
• use_crc_ : esphome::haier::HaierClimateBase
• use_dma_ : esphome::esp32_rmt_led_strip::ESP32RMTLEDStripLightOutput
• use_extended_id : esphome::canbus::CanFrame
• use_extended_id_ : esphome::canbus::Canbus, esphome::canbus::CanbusSendAction< Ts >, esphome::canbus::CanbusTrigger
• use_fahrenheit : esphome::haier::hon_protocol::HaierPacketControl, esphome::haier::smartair2_protocol::HaierPacketControl
• use_mclk_ : esphome::es8311::ES8311
• use_mic_ : esphome::es8311::ES8311
• use_psram_ : esphome::esp32_rmt_led_strip::ESP32RMTLEDStripLightOutput
• use_random_color_ : esphome::light::AddressableFireworksEffect
• use_raw_ : esphome::touchscreen::TouchscreenBinarySensor
• use_rm433_remote_ : esphome::sonoff_d1::SonoffD1Output
• use_startup_delay_ : esphome::thermostat::ThermostatClimate
• use_swing_bits : esphome::haier::smartair2_protocol::HaierPacketControl
• use_wake_word_ : esphome::voice_assistant::VoiceAssistant
• use_write_multiple_ : esphome::modbus_controller::ModbusBinaryOutput, esphome::modbus_controller::ModbusFloatOutput, esphome::modbus_controller::ModbusNumber, esphome::modbus_controller::ModbusSelect, esphome::modbus_controller::ModbusSwitch
• usebgr_ : esphome::st7735::ST7735
• used_polling_commands_ : esphome::pipsolar::Pipsolar
• user_defined_chars_ : esphome::lcd_base::LCDDisplay
• user_services_ : esphome::api::APIServer
• useragent_ : esphome::http_request::HttpRequestComponent
• username : esphome::mqtt::MQTTCredentials, esphome::web_server_base::internal::Credentials, esphome::wifi::EAPAuth
• username_ : esphome::http_request::OtaHttpRequestComponent, esphome::mqtt::MQTTBackendESP32
• uses_custom_fan_mode : esphome::climate::ClimateDeviceRestoreState
• uses_custom_preset : esphome::climate::ClimateDeviceRestoreState
• uses_password : esphome::api::DeviceInfoResponse
• using_hw_ : esphome::spi::SPIComponent
• using_saved_calibrations_ : esphome::atm90e32::ATM90E32Component
• ussd_ : esphome::sim800l::Sim800LComponent
• ussd_received_callback_ : esphome::sim800l::Sim800LComponent
• uuid : esphome::api::BluetoothGATTCharacteristic, esphome::api::BluetoothGATTDescriptor, esphome::api::BluetoothGATTService, esphome::api::BluetoothServiceData, esphome::esp32_ble_client::BLECharacteristic, esphome::esp32_ble_client::BLEDescriptor, esphome::esp32_ble_client::BLEService, esphome::esp32_ble_tracker::ServiceData
• uuid_ : esphome::ble_presence::BLEPresenceDevice, esphome::ble_rssi::BLERSSISensor, esphome::esp32_ble::ESPBTUUID, esphome::esp32_ble_beacon::ESP32BLEBeacon, esphome::esp32_ble_server::BLECharacteristic, esphome::esp32_ble_server::BLEDescriptor, esphome::esp32_ble_server::BLEService, esphome::esp32_ble_tracker::BLEManufacturerDataAdvertiseTrigger, esphome::esp32_ble_tracker::BLEServiceDataAdvertiseTrigger
• uv_sensor_ : esphome::ltr390::LTR390Component
• uvi_sensor_ : esphome::ltr390::LTR390Component