diff --git a/platformio.ini b/platformio.ini
index ea6b99a69..25f6ff9c9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -34,6 +34,7 @@ src_dir = sonoff
 ;env_default = sonoff-PT
 ;env_default = sonoff-RU
 ;env_default = sonoff-SE
+;env_default = sonoff-SK
 ;env_default = sonoff-TR
 ;env_default = sonoff-TW
 ;env_default = sonoff-UK
@@ -484,6 +485,20 @@ upload_resetmethod = ${common.upload_resetmethod}
 upload_speed = ${common.upload_speed}
 extra_scripts = ${common.extra_scripts}
 
+[env:sonoff-SK]
+platform = ${common.platform}
+framework = ${common.framework}
+board = ${common.board}
+board_build.flash_mode = ${common.board_build.flash_mode}
+board_build.f_cpu = ${common.board_build.f_cpu}
+build_unflags = ${common.build_unflags}
+build_flags = ${common.build_flags} -DMY_LANGUAGE=sk-SK
+monitor_speed = ${common.monitor_speed}
+upload_port = ${common.upload_port}
+upload_resetmethod = ${common.upload_resetmethod}
+upload_speed = ${common.upload_speed}
+extra_scripts = ${common.extra_scripts}
+
 [env:sonoff-TR]
 platform = ${common.platform}
 framework = ${common.framework}
diff --git a/sonoff/language/sk-SK.h b/sonoff/language/sk-SK.h
new file mode 100644
index 000000000..a01fa1b3e
--- /dev/null
+++ b/sonoff/language/sk-SK.h
@@ -0,0 +1,609 @@
+/*
+  sk-SK.h - localization for Slovak with diacritics - Slovak for Sonoff-Tasmota
+
+  Copyright (C) 2018  Vladimír Jendroľ
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _LANGUAGE_SK_SK_H_
+#define _LANGUAGE_SK_SK_H_
+
+/*************************** ATTENTION *******************************\
+ *
+ * Due to memory constraints only UTF-8 is supported.
+ * To save code space keep text as short as possible.
+ * Time and Date provided by SDK can not be localized (yet).
+ * Use online command StateText to translate ON, OFF, HOLD and TOGGLE.
+ * Use online command Prefix to translate cmnd, stat and tele.
+ *
+ * Updated until v6.2.1.14
+\*********************************************************************/
+
+//#define LANGUAGE_MODULE_NAME         // Enable to display "Module Generic" (ie Spanish), Disable to display "Generic Module" (ie English)
+
+#define LANGUAGE_LCID 1029
+// HTML (ISO 639-1) Language Code
+#define D_HTML_LANGUAGE "sk"
+
+// "2017-03-07T11:08:02" - ISO8601:2004
+#define D_YEAR_MONTH_SEPARATOR "-"
+#define D_MONTH_DAY_SEPARATOR "-"
+#define D_DATE_TIME_SEPARATOR "T"
+#define D_HOUR_MINUTE_SEPARATOR ":"
+#define D_MINUTE_SECOND_SEPARATOR ":"
+
+#define D_DAY3LIST "Ne Po Ut St Št Pi So"
+#define D_MONTH3LIST "JanFebMarAprMájJúnJúlAugSepOktNovDec"
+
+// Non JSON decimal separator
+#define D_DECIMAL_SEPARATOR ","
+
+// Common
+#define D_ADMIN "Admin"
+#define D_AIR_QUALITY "Kvalita vzduchu"
+#define D_AP "AP"                    // Access Point
+#define D_AS "ako"
+#define D_AUTO "AUTO"
+#define D_BLINK "Blikanie"
+#define D_BLINKOFF "BlikanieVyp"
+#define D_BOOT_COUNT "Počítadlo spustení"
+#define D_BRIGHTLIGHT "Svetlý"
+#define D_BSSID "BSSId"
+#define D_BUTTON "Tlačídlo"
+#define D_BY "by"                    // Written by me
+#define D_BYTES "Bytov"
+#define D_CELSIUS "°C"
+#define D_CHANNEL "Kanál"
+#define D_CO2 "CO2"
+#define D_CODE "kód"                 // Button code
+#define D_COLDLIGHT "Studené svetlo"
+#define D_COMMAND "Príkaz"
+#define D_CONNECTED "...pripojené"
+#define D_COUNT "Počítaj"
+#define D_COUNTER "Počítadlo"
+#define D_CURRENT "Prúd"          // As in Voltage and Current
+#define D_DATA "Dáta"
+#define D_DARKLIGHT "Tmavý"
+#define D_DEBUG "Debug"
+#define D_DISABLED "Zablokované"
+#define D_DISTANCE "Vzdialenosť"
+#define D_DNS_SERVER "Server DNS"
+#define D_DONE "Hotovo"
+#define D_DST_TIME "DST"
+#define D_ECO2 "eCO2"
+#define D_EMULATION "Emulácia"
+#define D_ENABLED "Otvorený"
+#define D_ERASE "Zmaž"
+#define D_ERROR "Chyba"
+#define D_FAHRENHEIT "Fahrenheita"
+#define D_FAILED "chyba"
+#define D_FALLBACK "Záložný"
+#define D_FALLBACK_TOPIC "Záložný topic"
+#define D_FALSE "Nepravda"
+#define D_FILE "Súbor"
+#define D_FREE_MEMORY "Voľná pamäť"
+#define D_FREQUENCY "Frekvencia"
+#define D_GAS "Plyn"
+#define D_GATEWAY "Predvolená brána"
+#define D_GROUP "Skupina"
+#define D_HOST "Server"
+#define D_HOSTNAME "Názov servera"
+#define D_HUMIDITY "Vlhkosť"
+#define D_ILLUMINANCE "Osvetlenie"
+#define D_IMMEDIATE "Okamžité"      // Button immediate
+#define D_INDEX "Index"
+#define D_INFO "Informácie"
+#define D_INFRARED "Infračervené"
+#define D_INITIALIZED "Inicializovaný"
+#define D_IP_ADDRESS "Adresa IP"
+#define D_LIGHT "Svetlo"
+#define D_LWT "LWT"
+#define D_MODULE "Modul"
+#define D_MQTT "MQTT"
+#define D_MULTI_PRESS "multi-stlačenie"
+#define D_NOISE "Hluk"
+#define D_NONE "Žiadny"
+#define D_OFF "Vyp."
+#define D_OFFLINE "Neaktívny"
+#define D_OK "OK"
+#define D_ON "Zap."
+#define D_ONLINE "Aktívny"
+#define D_PASSWORD "Heslo"
+#define D_PORT "Port"
+#define D_POWER_FACTOR "Účinník"
+#define D_POWERUSAGE "Príkon"
+#define D_POWERUSAGE_ACTIVE "Činný príkon"
+#define D_POWERUSAGE_APPARENT "Zdanlivý príkon"
+#define D_POWERUSAGE_REACTIVE "Jalový príkon"
+#define D_PRESSURE "Tlak"
+#define D_PRESSUREATSEALEVEL "Tlak na hladine mora"
+#define D_PROGRAM_FLASH_SIZE "Veľkosť flash pamäte"
+#define D_PROGRAM_SIZE "Veľkosť programu"
+#define D_PROJECT "Projekt"
+#define D_RAIN "Dážď"
+#define D_RECEIVED "Prijatý"
+#define D_RESTART "Reštart"
+#define D_RESTARTING "Reštartuje sa"
+#define D_RESTART_REASON "Príčina reštartu"
+#define D_RESTORE "Obnoviť"
+#define D_RETAINED "Zachované"
+#define D_RULE "Pravidlo"
+#define D_SAVE "Ulož"
+#define D_SENSOR "Senzor"
+#define D_SSID "SSID"
+#define D_START "Spustiť"
+#define D_STD_TIME "STD"
+#define D_STOP "Stop"
+#define D_SUBNET_MASK "Maska podsiete"
+#define D_SUBSCRIBE_TO "Prihlásiť do"
+#define D_SUCCESSFUL "úspešné."
+#define D_SUNRISE "Svitanie"
+#define D_SUNSET "Súmrak"
+#define D_TEMPERATURE "Teplota"
+#define D_TO "do"
+#define D_TOGGLE "Prepni"
+#define D_TOPIC "Topic"
+#define D_TRANSMIT "Odošli"
+#define D_TRUE "Pravda"
+#define D_TVOC "TVOC"
+#define D_UPGRADE "aktualizáciu"
+#define D_UPLOAD "Nahrávanie..."
+#define D_UPTIME "Uptime"
+#define D_USER "Používateľ"
+#define D_UTC_TIME "UTC"
+#define D_UV_INDEX "UV Index"
+#define D_UV_INDEX_1 "Nízky"
+#define D_UV_INDEX_2 "Stredný"
+#define D_UV_INDEX_3 "Vysoký"
+#define D_UV_INDEX_4 "Nebezpečný"
+#define D_UV_INDEX_5 "Popál1/2"
+#define D_UV_INDEX_6 "Popál3"
+#define D_UV_INDEX_7 "MimoRozsah"
+#define D_UV_LEVEL "úroveň UV"
+#define D_UV_POWER "UV Power"
+#define D_VERSION "Verzia"
+#define D_VOLTAGE "Napätie"
+#define D_WEIGHT "Hmotnosť"
+#define D_WARMLIGHT "Teplé svetlo"
+#define D_WEB_SERVER "Web Server"
+
+// sonoff.ino
+#define D_WARNING_MINIMAL_VERSION "UPOZORNENIE Táto verzia nepodporuje trvalé nastavenia"
+#define D_LEVEL_10 "úroveň 1-0"
+#define D_LEVEL_01 "úroveň 0-1"
+#define D_SERIAL_LOGGING_DISABLED "Logovanie na sériovom porte ukončené"
+#define D_SYSLOG_LOGGING_REENABLED "Obnovený zápis do Syslog"
+
+#define D_SET_BAUDRATE_TO "Nastaviť rýchlosti prenosu na"
+#define D_RECEIVED_TOPIC "Prijatý topic"
+#define D_DATA_SIZE "Veľkosť dát"
+#define D_ANALOG_INPUT "Analógový vstup"
+
+// support.ino
+#define D_OSWATCH "osWatch"
+#define D_BLOCKED_LOOP "Zablokovanie slučky"
+#define D_WPS_FAILED_WITH_STATUS "Chyba WPSconfig so statusom"
+#define D_ACTIVE_FOR_3_MINUTES "aktívny 3 minúty"
+#define D_FAILED_TO_START "nepodarilo sa spustiť"
+#define D_PATCH_ISSUE_2186 "Chyba 2186"
+#define D_CONNECTING_TO_AP "Pripájanie k AP"
+#define D_IN_MODE "v režime"
+#define D_CONNECT_FAILED_NO_IP_ADDRESS "Chyba pripojenia, nebola obdržaná IP adresa"
+#define D_CONNECT_FAILED_AP_NOT_REACHED "Chyba pripojenia, nedostupný AP"
+#define D_CONNECT_FAILED_WRONG_PASSWORD "Chyba pripojenia, nesprávne heslo pre AP"
+#define D_CONNECT_FAILED_AP_TIMEOUT "Chyba pripojenia, uplynul AP timeout"
+#define D_ATTEMPTING_CONNECTION "Pripájanie..."
+#define D_CHECKING_CONNECTION "Skúška spojenia..."
+#define D_QUERY_DONE "Vyslanie požiadavky. Nájdená služba MQTT"
+#define D_MQTT_SERVICE_FOUND "Služba MQTT bola nájdená"
+#define D_FOUND_AT "nájdené v"
+#define D_SYSLOG_HOST_NOT_FOUND "Syslog Host nebol nájdený"
+
+// settings.ino
+#define D_SAVED_TO_FLASH_AT "Uložené do flash pamäte v"
+#define D_LOADED_FROM_FLASH_AT "Stiahnuté z flash pamäte z"
+#define D_USE_DEFAULTS "Použi prednastavené hodnoty"
+#define D_ERASED_SECTOR "Zmazaný sektor"
+
+// xdrv_02_webserver.ino
+#define D_NOSCRIPT "Pre používanie prostredia Tasmota povoľte JavaScript"
+#define D_MINIMAL_FIRMWARE_PLEASE_UPGRADE "Firmware MINIMÁLNY - prosím aktualizujte"
+#define D_WEBSERVER_ACTIVE_ON "Aktívny Web server"
+#define D_WITH_IP_ADDRESS "na IP adrese"
+#define D_WEBSERVER_STOPPED "Web server zastavený"
+#define D_FILE_NOT_FOUND "Súbor nebol nájdený"
+#define D_REDIRECTED "Presmerovanie na vlastný portál"
+#define D_WIFIMANAGER_SET_ACCESSPOINT_AND_STATION "Wi-Fi manažér nastaví AP a zachová STA"
+#define D_WIFIMANAGER_SET_ACCESSPOINT "Wi-Fi manažér nastaví Access Point"
+#define D_TRYING_TO_CONNECT "Skúšam pripojiť zariadenie k sieti"
+
+#define D_RESTART_IN "Reštart"
+#define D_SECONDS "sekúnd"
+#define D_DEVICE_WILL_RESTART "Zariadenie bude reštartované behom niekoľkých sekúnd"
+#define D_BUTTON_TOGGLE "Prepínač"
+#define D_CONFIGURATION "Nastavenia"
+#define D_INFORMATION "Informácie"
+#define D_FIRMWARE_UPGRADE "Aktualizácia firmware"
+#define D_CONSOLE "Konzola"
+#define D_CONFIRM_RESTART "Potvrdenie reštartu"
+
+#define D_CONFIGURE_MODULE "Nastavenia modulu"
+#define D_CONFIGURE_WIFI "Nastavenia WiFi"
+#define D_CONFIGURE_MQTT "Nastavenia MQTT"
+#define D_CONFIGURE_DOMOTICZ "Nastavenia Domoticz"
+#define D_CONFIGURE_LOGGING "Nastavenia logovania"
+#define D_CONFIGURE_OTHER "Ostatné nastavenia"
+#define D_CONFIRM_RESET_CONFIGURATION "Potvrdenie resetu nastavení"
+#define D_RESET_CONFIGURATION "Reset nastavení"
+#define D_BACKUP_CONFIGURATION "Záloha nastavení"
+#define D_RESTORE_CONFIGURATION "Obnovenie nastavení"
+#define D_MAIN_MENU "Hlavné menu"
+
+#define D_MODULE_PARAMETERS "Nastavenia modulu"
+#define D_MODULE_TYPE "Typ modulu"
+#define D_GPIO "GPIO"
+#define D_SERIAL_IN "Serial In"
+#define D_SERIAL_OUT "Serial Out"
+
+#define D_WIFI_PARAMETERS "Nastavenia WiFi"
+#define D_SCAN_FOR_WIFI_NETWORKS "Sken WiFi sietí"
+#define D_SCAN_DONE "Sken dokončený"
+#define D_NO_NETWORKS_FOUND "Sieť nebola nájdená"
+#define D_REFRESH_TO_SCAN_AGAIN "Zopakovať sken"
+#define D_DUPLICATE_ACCESSPOINT "Kópia AP"
+#define D_SKIPPING_LOW_QUALITY "Preskočenie z dôvodu kvality signálu"
+#define D_RSSI "RSSI"
+#define D_WEP "WEP"
+#define D_WPA_PSK "WPA PSK"
+#define D_WPA2_PSK "WPA2 PSK"
+#define D_AP1_SSID "AP1 SSID"
+#define D_AP1_PASSWORD "Heslo AP1"
+#define D_AP2_SSID "AP2 SSID"
+#define D_AP2_PASSWORD "Heslo AP2"
+
+#define D_MQTT_PARAMETERS "Nastavenia MQTT"
+#define D_CLIENT "Klient"
+#define D_FULL_TOPIC "Celý topic"
+
+#define D_LOGGING_PARAMETERS "Voľba logovania"
+#define D_SERIAL_LOG_LEVEL "Sériová úroveň logu"
+#define D_WEB_LOG_LEVEL "Webová úroveň logu"
+#define D_SYS_LOG_LEVEL "Systemová úroveň logu"
+#define D_MORE_DEBUG "Viac debug informácí"
+#define D_SYSLOG_HOST "Syslog host"
+#define D_SYSLOG_PORT "Syslog port"
+#define D_TELEMETRY_PERIOD "Interval telemetrie"
+
+#define D_OTHER_PARAMETERS "Ostatné nastavenia"
+#define D_WEB_ADMIN_PASSWORD "Heslo Web administrátora"
+#define D_MQTT_ENABLE "MQTT aktívne"
+#define D_FRIENDLY_NAME "Friendly Name"
+#define D_BELKIN_WEMO "Belkin WeMo"
+#define D_HUE_BRIDGE "Hue Bridge"
+#define D_SINGLE_DEVICE "single device"
+#define D_MULTI_DEVICE "multi device"
+
+#define D_SAVE_CONFIGURATION "Ulož nastavenia"
+#define D_CONFIGURATION_SAVED "Nastavenia uložené"
+#define D_CONFIGURATION_RESET "Nastavenia resetované"
+
+#define D_PROGRAM_VERSION "Verzia programu"
+#define D_BUILD_DATE_AND_TIME "Datum a čas kompilácie"
+#define D_CORE_AND_SDK_VERSION "Verzia Core/SDK"
+#define D_FLASH_WRITE_COUNT "Počet zápisov do pamäte"
+#define D_MAC_ADDRESS "Adresa MAC"
+#define D_MQTT_HOST "Host MQTT"
+#define D_MQTT_PORT "Port MQTT"
+#define D_MQTT_CLIENT "Klient MQTT"
+#define D_MQTT_USER "Používateľ MQTT"
+#define D_MQTT_TOPIC "Topic MQTT"
+#define D_MQTT_GROUP_TOPIC "Topic skupiny MQTT"
+#define D_MQTT_FULL_TOPIC "Celý topic MQTT"
+#define D_MDNS_DISCOVERY "Získavanie mDNS"
+#define D_MDNS_ADVERTISE "Rozosielanie mDNS"
+#define D_ESP_CHIP_ID "ID systému ESP"
+#define D_FLASH_CHIP_ID "ID systému flash pamäte"
+#define D_FLASH_CHIP_SIZE "Veľkosť flash"
+#define D_FREE_PROGRAM_SPACE "Voľné místo pre program"
+
+#define D_UPGRADE_BY_WEBSERVER "Aktualizácia z Web serveru"
+#define D_OTA_URL "URL OTA"
+#define D_START_UPGRADE "Spustiť aktualizáciu"
+#define D_UPGRADE_BY_FILE_UPLOAD "Aktualizácia nahraním súboru"
+#define D_UPLOAD_STARTED "Nahrávanie spustené"
+#define D_UPGRADE_STARTED "Aktualizácia spustená"
+#define D_UPLOAD_DONE "Nahrávanie ukončené"
+#define D_UPLOAD_ERR_1 "Súbor nebol vybraný"
+#define D_UPLOAD_ERR_2 "Málo miesta"
+#define D_UPLOAD_ERR_3 "Magický byte má hodnotu inú než 0xE9"
+#define D_UPLOAD_ERR_4 "Veľkosť programu je väčšia než skutočná veľkosť flash pamäte"
+#define D_UPLOAD_ERR_5 "Chyba nahrávania, nesúhlasia porovnávané bity"
+#define D_UPLOAD_ERR_6 "Chyba nahrávania. Spustený zápis do logu na úrovni 3"
+#define D_UPLOAD_ERR_7 "Nahrávanie prerušené"
+#define D_UPLOAD_ERR_8 "Nesprávny súbor"
+#define D_UPLOAD_ERR_9 "Súbor je príliš veľký"
+#define D_UPLOAD_ERR_10 "Chyba inicializácie RF chipu"
+#define D_UPLOAD_ERR_11 "Chyba zmazania RF chipu"
+#define D_UPLOAD_ERR_12 "Chyba pri zápise do RF chipu"
+#define D_UPLOAD_ERR_13 "Chyba dekódovania RF firmwaru"
+#define D_UPLOAD_ERROR_CODE "Chyba nahrávania"
+
+#define D_ENTER_COMMAND "Vlož príkaz"
+#define D_ENABLE_WEBLOG_FOR_RESPONSE "Zapni úroveň 2 zápisu Weblog, ak je očekávaná odpoveď"
+#define D_NEED_USER_AND_PASSWORD "Vyžadovaný používateľ=<username>&heslo=<password>"
+
+// xdrv_01_mqtt.ino
+#define D_FINGERPRINT "Verifikuj odtlačok TLS..."
+#define D_TLS_CONNECT_FAILED_TO "Nepripojené TLS do"
+#define D_RETRY_IN "Zopakujem o"
+#define D_VERIFIED "Overený odtlačok "
+#define D_INSECURE "Nesprávne pripojenie z dôvodu chybného odtlačku TLS"
+#define D_CONNECT_FAILED_TO "Nepodarilo sa nadviazať spojenie"
+
+// xplg_wemohue.ino
+#define D_MULTICAST_DISABLED "Multicast je vypnutý"
+#define D_MULTICAST_REJOINED "Multicast opäť pripojený"
+#define D_MULTICAST_JOIN_FAILED "Multicast neúspešný"
+#define D_FAILED_TO_SEND_RESPONSE "Nepodarilo sa odoslať odpoveď"
+
+#define D_WEMO "WeMo"
+#define D_WEMO_BASIC_EVENT "WeMo základná udalosť"
+#define D_WEMO_EVENT_SERVICE "WeMo servisná udalosť"
+#define D_WEMO_META_SERVICE "WeMo meta udalosť"
+#define D_WEMO_SETUP "WeMo setup"
+#define D_RESPONSE_SENT "Odpoveď odoslaná"
+
+#define D_HUE "Hue"
+#define D_HUE_BRIDGE_SETUP "Hue setup"
+#define D_HUE_API_NOT_IMPLEMENTED "Hue API nie je implementované"
+#define D_HUE_API "Hue API"
+#define D_HUE_POST_ARGS "Hue POST args"
+#define D_3_RESPONSE_PACKETS_SENT "3 pakety odpovede odoslané"
+
+// xdrv_07_domoticz.ino
+#define D_DOMOTICZ_PARAMETERS "Nastavenia Domoticz"
+#define D_DOMOTICZ_IDX "Idx"
+#define D_DOMOTICZ_KEY_IDX "Key idx"
+#define D_DOMOTICZ_SWITCH_IDX "Spinac idx"
+#define D_DOMOTICZ_SENSOR_IDX "Sensor idx"
+  #define D_DOMOTICZ_TEMP "Temp"
+  #define D_DOMOTICZ_TEMP_HUM "Temp,Vlhk"
+  #define D_DOMOTICZ_TEMP_HUM_BARO "Temp,Vlhk,Tlak"
+  #define D_DOMOTICZ_POWER_ENERGY "Príkon,Energia"
+  #define D_DOMOTICZ_ILLUMINANCE "Osvetlenie"
+  #define D_DOMOTICZ_COUNT "Počítadlo/PM1"
+  #define D_DOMOTICZ_VOLTAGE "Napätie/PM2,5"
+  #define D_DOMOTICZ_CURRENT "Prúd/PM10"
+  #define D_DOMOTICZ_AIRQUALITY "AirQuality"
+#define D_DOMOTICZ_UPDATE_TIMER "Aktualizácia časovača"
+
+// xdrv_09_timers.ino
+#define D_CONFIGURE_TIMER "Nastavenia časovača"
+#define D_TIMER_PARAMETERS "Časovač"
+#define D_TIMER_ENABLE "Povoľ časovače"
+#define D_TIMER_ARM "Aktívne"
+#define D_TIMER_TIME "Čas"
+#define D_TIMER_DAYS "Dni"
+#define D_TIMER_REPEAT "Opakovať"
+#define D_TIMER_OUTPUT "Výstup"
+#define D_TIMER_ACTION "Napájanie"
+
+// xdrv_10_knx.ino
+#define D_CONFIGURE_KNX "Nastavenie KNX"
+#define D_KNX_PARAMETERS "KNX parametre"
+#define D_KNX_GENERAL_CONFIG "Všeobecné"
+#define D_KNX_PHYSICAL_ADDRESS "Fyzická adresa"
+#define D_KNX_PHYSICAL_ADDRESS_NOTE "( Musí být jedinečná v sieti KNX )"
+#define D_KNX_ENABLE "Povoľ KNX"
+#define D_KNX_GROUP_ADDRESS_TO_WRITE "Dáta na odoslanie na skupinové adresy"
+#define D_ADD "Pridať"
+#define D_DELETE "Zmazať"
+#define D_REPLY "Odpoveď"
+#define D_KNX_GROUP_ADDRESS_TO_READ "Skupinové adresy pre príjem dát z"
+#define D_LOG_KNX "KNX: "
+#define D_RECEIVED_FROM "Prijaté z"
+#define D_KNX_COMMAND_WRITE "Zapíš"
+#define D_KNX_COMMAND_READ "Čítaj"
+#define D_KNX_COMMAND_OTHER "Iné"
+#define D_SENT_TO "pošli"
+#define D_KNX_WARNING "Skupinová adresa ( 0 / 0 / 0 ) je rezervovaná a nemôže byť použitá."
+#define D_KNX_ENHANCEMENT "Communication Enhancement"
+#define D_KNX_TX_SLOT "KNX TX"
+#define D_KNX_RX_SLOT "KNX RX"
+
+// xdrv_03_energy.ino
+#define D_ENERGY_TODAY "Spotreba dnes"
+#define D_ENERGY_YESTERDAY "Spotreba včera"
+#define D_ENERGY_TOTAL "Celková spotreba"
+
+// xsns_05_ds18b20.ino
+#define D_SENSOR_BUSY "Sensor DS18x20 obsadený"
+#define D_SENSOR_CRC_ERROR "Sensor DS18x20 chyba CRC"
+#define D_SENSORS_FOUND "Nanájdený senzor DS18x20"
+
+// xsns_06_dht.ino
+#define D_TIMEOUT_WAITING_FOR "Čakanie na"
+#define D_START_SIGNAL_LOW "nízký štartovací signál"
+#define D_START_SIGNAL_HIGH "vysoký štartovací signál"
+#define D_PULSE "impulz"
+#define D_CHECKSUM_FAILURE "Chybný kontrolný súčet"
+
+// xsns_07_sht1x.ino
+#define D_SENSOR_DID_NOT_ACK_COMMAND "Senzor neobdržal príkaz ACK"
+#define D_SHT1X_FOUND "SHT1X nanájdený"
+
+// xsns_18_pms5003.ino
+#define D_STANDARD_CONCENTRATION "CF-1 PM"     // Standard Particle CF-1 Particle Matter
+#define D_ENVIRONMENTAL_CONCENTRATION "PM"     // Environmetal Particle Matter
+#define D_PARTICALS_BEYOND "častíc"
+
+// xsns_32_mpu6050.ino
+#define D_AX_AXIS "Accel. os-X"
+#define D_AY_AXIS "Accel. os-Y"
+#define D_AZ_AXIS "Accel. os-Z"
+#define D_GX_AXIS "Gyro os-X"
+#define D_GY_AXIS "Gyro os-Y"
+#define D_GZ_AXIS "Gyro os-Z"
+
+// xsns_34_hx711.ino
+#define D_HX_CAL_REMOVE "Odstráňte záťaž"
+#define D_HX_CAL_REFERENCE "Vložte referenčnú záťaž"
+#define D_HX_CAL_DONE "Skalibrováné"
+#define D_HX_CAL_FAIL "Chyba kalibráce"
+#define D_RESET_HX711 "Reset váhy"
+#define D_CONFIGURE_HX711 "Konfiguráce váhy"
+#define D_HX711_PARAMETERS "Parametre váhy"
+#define D_ITEM_WEIGHT "Vlastná hmotnosť"
+#define D_REFERENCE_WEIGHT "Referenčná hmotnosť"
+#define D_CALIBRATE "Kalibruj"
+#define D_CALIBRATION "Kalibrácia"
+
+//xsns_35_tx20.ino
+#define D_TX20_WIND_DIRECTION "Smer vetra"
+#define D_TX20_WIND_SPEED "Rýchlosť vetra"
+#define D_TX20_WIND_SPEED_AVG "Priemerná rýchlosť vetra"
+#define D_TX20_WIND_SPEED_MAX "Maximálna rýchlosť vetra"
+#define D_TX20_NORTH "S"
+#define D_TX20_EAST "V"
+#define D_TX20_SOUTH "J"
+#define D_TX20_WEST "Z"
+
+// sonoff_template.h
+#define D_SENSOR_NONE     "Žiaden"
+#define D_SENSOR_DHT11    "DHT11"
+#define D_SENSOR_AM2301   "AM2301"
+#define D_SENSOR_SI7021   "SI7021"
+#define D_SENSOR_DS18X20  "DS18x20"
+#define D_SENSOR_I2C_SCL  "I2C SCL"
+#define D_SENSOR_I2C_SDA  "I2C SDA"
+#define D_SENSOR_WS2812   "WS2812"
+#define D_SENSOR_DFR562   "MP3 Player"
+#define D_SENSOR_IRSEND   "IRsend"
+#define D_SENSOR_SWITCH   "Spínač"   // Suffix "1"
+#define D_SENSOR_BUTTON   "Tlačidlo"   // Suffix "1"
+#define D_SENSOR_RELAY    "Relé"    // Suffix "1i"
+#define D_SENSOR_LED      "Led"      // Suffix "1i"
+#define D_SENSOR_PWM      "PWM"      // Suffix "1",
+#define D_SENSOR_COUNTER  "Počítadlo"  // Suffix "1"
+#define D_SENSOR_IRRECV   "IRrecv"
+#define D_SENSOR_MHZ_RX   "MHZ Rx"
+#define D_SENSOR_MHZ_TX   "MHZ Tx"
+#define D_SENSOR_PZEM004_RX  "PZEM004 Rx"
+#define D_SENSOR_PZEM016_RX  "PZEM016 Rx"
+#define D_SENSOR_PZEM017_RX  "PZEM017 Rx"
+#define D_SENSOR_PZEM0XX_TX  "PZEM0XX Tx"
+#define D_SENSOR_SAIR_RX  "SAir Rx"
+#define D_SENSOR_SAIR_TX  "SAir Tx"
+#define D_SENSOR_SPI_CS   "SPI CS"
+#define D_SENSOR_SPI_DC   "SPI DC"
+#define D_SENSOR_BACKLIGHT "BkLight"
+#define D_SENSOR_PMS5003  "PMS5003"
+#define D_SENSOR_SDS0X1_RX "SDS0X1 Rx"
+#define D_SENSOR_SDS0X1_TX "SDS0X1 Tx"
+#define D_SENSOR_SBR_RX   "SerBr Rx"
+#define D_SENSOR_SBR_TX   "SerBr Tx"
+#define D_SENSOR_SR04_TRIG "SR04 Tri"
+#define D_SENSOR_SR04_ECHO "SR04 Ech"
+#define D_SENSOR_SDM120_TX "SDM120/220 Tx"
+#define D_SENSOR_SDM120_RX "SDM120/220 Rx"
+#define D_SENSOR_SDM630_TX "SDM630 Tx"
+#define D_SENSOR_SDM630_RX "SDM630 Rx"
+#define D_SENSOR_TM1638_CLK "TM16 CLK"
+#define D_SENSOR_TM1638_DIO "TM16 DIO"
+#define D_SENSOR_TM1638_STB "TM16 STB"
+#define D_SENSOR_HX711_SCK "HX711 SCK"
+#define D_SENSOR_HX711_DAT "HX711 DAT"
+#define D_SENSOR_TX20_TX "TX20"
+#define D_SENSOR_RFSEND "RFSend"
+#define D_SENSOR_RFRECV "RFrecv"
+#define D_SENSOR_TUYA_TX "Tuya Tx"
+#define D_SENSOR_TUYA_RX "Tuya Rx"
+#define D_SENSOR_MGC3130_XFER "MGC3130 Xfer"
+#define D_SENSOR_MGC3130_RESET "MGC3130 Reset"
+#define D_SENSOR_SSPI_MISO "SSPI MISO"
+#define D_SENSOR_SSPI_MOSI "SSPI MOSI"
+#define D_SENSOR_SSPI_SCLK "SSPI SCLK"
+#define D_SENSOR_SSPI_CS   "SSPI CS"
+#define D_SENSOR_SSPI_DC   "SSPI DC"
+#define D_SENSOR_RF_SENSOR "RF Senzor"
+
+// Units
+#define D_UNIT_AMPERE "A"
+#define D_UNIT_CENTIMETER "cm"
+#define D_UNIT_HERTZ "Hz"
+#define D_UNIT_HOUR "hod"
+#define D_UNIT_KILOGRAM "kg"
+#define D_UNIT_INCREMENTS "inc"
+#define D_UNIT_KILOMETER_PER_HOUR "km/h"  // or "km/h"
+#define D_UNIT_KILOOHM "kOhm"
+#define D_UNIT_KILOWATTHOUR "kWh"
+#define D_UNIT_LUX "lx"
+#define D_UNIT_MICROGRAM_PER_CUBIC_METER "ug/m3"
+#define D_UNIT_MICROMETER "um"
+#define D_UNIT_MICROSECOND "us"
+#define D_UNIT_MILLIAMPERE "mA"
+#define D_UNIT_MILLIMETER "mm"
+#define D_UNIT_MILLIMETER_MERCURY "mmHg"
+#define D_UNIT_MILLISECOND "ms"
+#define D_UNIT_MINUTE "min"
+#define D_UNIT_PARTS_PER_BILLION "ppb"
+#define D_UNIT_PARTS_PER_DECILITER "ppd"
+#define D_UNIT_PARTS_PER_MILLION "ppm"
+#define D_UNIT_PRESSURE "hPa"
+#define D_UNIT_SECOND "sek"
+#define D_UNIT_SECTORS "sektory"
+#define D_UNIT_VA "VA"
+#define D_UNIT_VAR "VAr"
+#define D_UNIT_VOLT "V"
+#define D_UNIT_WATT "W"
+#define D_UNIT_WATTHOUR "Wh"
+#define D_UNIT_WATT_METER_QUADRAT "W/m²"
+
+// Log message prefix
+#define D_LOG_APPLICATION "APP: "  // Application
+#define D_LOG_BRIDGE "BRG: "       // Bridge
+#define D_LOG_CONFIG "CFG: "       // Settings
+#define D_LOG_COMMAND "CMD: "      // Command
+#define D_LOG_DEBUG "DBG: "        // Debug
+#define D_LOG_DHT "DHT: "          // DHT sensor
+#define D_LOG_DOMOTICZ "DOM: "     // Domoticz
+#define D_LOG_DSB "DSB: "          // DS18xB20 sensor
+#define D_LOG_HTTP "HTP: "         // HTTP webserver
+#define D_LOG_I2C "I2C: "          // I2C
+#define D_LOG_IRR "IRR: "          // Infra Red Received
+#define D_LOG_LOG "LOG: "          // Logging
+#define D_LOG_MODULE "MOD: "       // Module
+#define D_LOG_MDNS "DNS: "         // mDNS
+#define D_LOG_MQTT "MQT: "         // MQTT
+#define D_LOG_OTHER "OTH: "        // Other
+#define D_LOG_RESULT "RSL: "       // Result
+#define D_LOG_RFR "RFR: "          // RF Received
+#define D_LOG_SERIAL "SER: "       // Serial
+#define D_LOG_SHT1 "SHT: "         // SHT1x sensor
+#define D_LOG_UPLOAD "UPL: "       // Upload
+#define D_LOG_UPNP "UPP: "         // UPnP
+#define D_LOG_WIFI "WIF: "         // Wifi
+
+//SDM220
+#define D_PHASE_ANGLE     "Phase Angle"
+#define D_IMPORT_ACTIVE   "Import Active"
+#define D_EXPORT_ACTIVE   "Export Active"
+#define D_IMPORT_REACTIVE "Import Reactive"
+#define D_EXPORT_REACTIVE "Export Reactive"
+#define D_TOTAL_REACTIVE  "Total Reactive"
+#define D_UNIT_KWARH      "kVArh"
+#define D_UNIT_ANGLE      "Deg"
+
+#endif  // _LANGUAGE_SK_SK_H_
diff --git a/sonoff/my_user_config.h b/sonoff/my_user_config.h
index 46cf3f015..cbc7a7790 100644
--- a/sonoff/my_user_config.h
+++ b/sonoff/my_user_config.h
@@ -209,6 +209,7 @@
 //#define MY_LANGUAGE            pt-BR           // Portuguese in Brazil
 //#define MY_LANGUAGE            pt-PT           // Portuguese in Portugal
 //#define MY_LANGUAGE            ru-RU           // Russian in Russia
+//#define MY_LANGUAGE            sk-SK           // Slovak in Slovakia
 //#define MY_LANGUAGE            sv-SE           // Swedish in Sweden
 //#define MY_LANGUAGE            tr-TR           // Turkish in Turkey
 //#define MY_LANGUAGE            uk-UK           // Ukrainian in Ukrain