diff --git a/hardware/esp8266com/esp8266/cores/esp8266/Arduino.h b/hardware/esp8266com/esp8266/cores/esp8266/Arduino.h
index 716cced9d..f507bef3b 100644
--- a/hardware/esp8266com/esp8266/cores/esp8266/Arduino.h
+++ b/hardware/esp8266com/esp8266/cores/esp8266/Arduino.h
@@ -158,6 +158,7 @@ volatile uint32_t* portModeRegister(uint32_t port);
 #include "WString.h"
 
 #include "HardwareSerial.h"
+#include "Esp.h"
 
 uint16_t makeWord(uint16_t w);
 uint16_t makeWord(byte h, byte l);
diff --git a/hardware/esp8266com/esp8266/cores/esp8266/Esp.cpp b/hardware/esp8266com/esp8266/cores/esp8266/Esp.cpp
new file mode 100644
index 000000000..8e7caf6e6
--- /dev/null
+++ b/hardware/esp8266com/esp8266/cores/esp8266/Esp.cpp
@@ -0,0 +1,57 @@
+/* 
+ Esp.cpp - ESP8266-specific APIs
+ Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
+ This file is part of the esp8266 core for Arduino environment.
+ 
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "Arduino.h"
+
+extern "C" {
+#include "user_interface.h"
+}
+
+extern "C" void ets_wdt_enable (void);
+extern "C" void ets_wdt_disable (void);
+extern "C" void wdt_feed (void);
+
+EspClass ESP;
+
+EspClass::EspClass()
+{
+
+}
+
+void EspClass::wdtEnable(int)
+{
+	ets_wdt_enable();
+}
+
+void EspClass::wdtDisable()
+{
+	ets_wdt_disable();
+}
+
+void EspClass::wdtFeed()
+{
+	wdt_feed();
+}
+
+void EspClass::deepSleep(uint32_t time_us, WakeMode mode)
+{
+	system_deep_sleep_set_option(static_cast<int>(mode));
+ 	system_deep_sleep(time_us);
+}
diff --git a/hardware/esp8266com/esp8266/cores/esp8266/Esp.h b/hardware/esp8266com/esp8266/cores/esp8266/Esp.h
new file mode 100644
index 000000000..7f10ec1d6
--- /dev/null
+++ b/hardware/esp8266com/esp8266/cores/esp8266/Esp.h
@@ -0,0 +1,46 @@
+/* 
+ Esp.h - ESP8266-specific APIs
+ Copyright (c) 2015 Ivan Grokhotkov. All rights reserved.
+ This file is part of the esp8266 core for Arduino environment.
+ 
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef ESP_H
+#define ESP_H
+
+
+enum WakeMode {
+    WAKE_RF_DEFAULT = 0, // RF_CAL or not after deep-sleep wake up, depends on init data byte 108.
+    WAKE_RFCAL = 1,      // RF_CAL after deep-sleep wake up, there will be large current.
+    WAKE_NO_RFCAL = 2,   // no RF_CAL after deep-sleep wake up, there will only be small current.
+    WAKE_RF_DISABLED = 4 // disable RF after deep-sleep wake up, just like modem sleep, there will be the smallest current.
+};
+
+class EspClass {
+    public:
+        EspClass();
+
+        void wdtEnable(int timeout_ms = 0);  
+        // TODO: figure out how to set WDT timeout
+        void wdtDisable();
+        void wdtFeed();
+
+        void deepSleep(uint32_t time_us, WakeMode mode = WAKE_RF_DEFAULT);
+};
+
+extern EspClass ESP;
+
+#endif //ESP_H