diff --git a/src/LuaArduino.cpp b/src/LuaArduino.cpp
index 712f3b4..57ca590 100644
--- a/src/LuaArduino.cpp
+++ b/src/LuaArduino.cpp
@@ -1,5 +1,6 @@
 #include "LuaArduino.h"
 #include "Arduino.h"
+#include "lua/arduino_functions.h"
 
 // static class in and out objects
 Stream* Lua::in = nullptr;
@@ -42,6 +43,18 @@ void Lua::initState() {
 
   // Clear the stack
   lua_settop(L, 0);
+  
+  //open Arduino libraries
+  luaopen_arduino(getState());
+  
+  //Add Arduino variables
+  const char arduino_vars[] = 
+  "LOW = 0\n"
+  "HIGH = 1\n"
+  "INPUT = 0\n"
+  "OUTPUT = 1\n"
+  "INPUT_PULLUP = 2\n";
+  loadString(arduino_vars);
 
 }
 
@@ -75,15 +88,15 @@ void Lua::loadString(const char lbuff[]) {
 }
 
 const char help_function[] = "function help ()\n"
-"  print('=== Lua Help =========================')\n"
+"  print('===== Lua Help ======')\n"
 "  print()\n"
 "  print('RAM Usage: ')\n"
-"  print(\"  print(collectgarbage'count')\")\n"
+"  print(\"collectgarbage'count'\")\n"
 "  print()\n"
-"  print('Force garbage collection: ')\n"
-"  print(\"  collectgarbage'collect'\")\n"
+"  print('Garbage collection: ')\n"
+"  print(\"collectgarbage'collect'\")\n"
 "  print()\n"
-"  print('Use EOT (Ctrl-D in miniterm.py) to exec code')\n"
+"  print('Ctrl-D to exec code')\n"
 "  print()\n"
 "end\n";
 
diff --git a/src/lua/arduino_functions.h b/src/lua/arduino_functions.h
new file mode 100644
index 0000000..822f4fe
--- /dev/null
+++ b/src/lua/arduino_functions.h
@@ -0,0 +1,87 @@
+#include <Arduino.h>
+#include <LuaArduino.h>
+#include <SPI.h>
+
+#ifndef arduino_functions_h
+#define arduino_functions_h
+
+static int l_pinMode(lua_State *L) {
+    double pin = lua_tonumber(L, 1);
+    double mode = lua_tonumber(L, 2);
+    pinMode((int)pin, (int)mode);
+    return 0;
+}
+
+static int l_digitalWrite(lua_State *L) {
+    double pin = lua_tonumber(L, 1);
+    double state = lua_tonumber(L, 2);
+    digitalWrite((int)pin, (int)state);
+    return 0;
+}
+
+static int l_digitalRead(lua_State *L) {
+    double pin = lua_tonumber(L, 1);
+    lua_pushnumber(L, digitalRead((int)pin));
+    return 1;
+}
+
+static int l_analogRead(lua_State *L) {
+    double pin = lua_tonumber(L, 1);
+    lua_pushnumber(L, analogRead(pin));
+    return 1;
+}
+
+static int l_analogWrite(lua_State *L) {
+    double pin = lua_tonumber(L, 1);
+    double value = lua_tonumber(L, 2);
+    analogWrite((int)pin, (int)value);
+    return 0;
+}
+
+static int l_millis(lua_State *L) {
+    lua_pushnumber(L, millis());
+    return 1;
+}
+
+static int l_delay(lua_State *L) {
+    double length = lua_tonumber(L, 1);
+    delay((long)length);
+    return 0;
+}
+
+static int l_tone(lua_State *L) {
+    double pin = lua_tonumber(L,1);
+    double freq = lua_tonumber(L,2);
+    tone((int)pin, (int)freq);
+    return 0;
+}
+
+static int l_noTone(lua_State *L) {
+    double pin = lua_tonumber(L, 1);
+    noTone((int)pin);
+    return 0;
+}
+
+static const struct luaL_reg arduinolib [] = {
+    {"pinMode", l_pinMode},
+    {"digitalWrite", l_digitalWrite},
+    {"digitalRead", l_digitalRead},
+    {"millis", l_millis},
+    {"analogRead", l_analogRead},
+    {"analogWrite", l_analogWrite},
+    {NULL, NULL}  /* sentinel */
+};
+
+int luaopen_arduino(lua_State *L) {
+    lua_register(L, "pinMode", l_pinMode);
+    lua_register(L, "digitalWrite", l_digitalWrite);
+    lua_register(L, "digitalRead", l_digitalRead);
+    lua_register(L, "millis", l_millis);
+    lua_register(L, "analogRead", l_analogRead);
+    lua_register(L, "analogWrite", l_analogWrite);
+    lua_register(L, "delay", l_delay);
+    lua_register(L, "tone", l_tone);
+    lua_register(L, "noTone", l_noTone);
+}
+
+#endif
\ No newline at end of file