diff --git a/library.properties b/library.properties
index b23f65b..c9e7305 100644
--- a/library.properties
+++ b/library.properties
@@ -1,6 +1,6 @@
 name=ESP8266-Arduino-Lua
-version=0.0.10
-author=François Dugast <1050329+fdu@users.noreply.github.com>
+version=0.0.20
+author=François Dugast <1050329+fdu@users.noreply.github.com>, Sasszem
 maintainer=François Dugast <1050329+fdu@users.noreply.github.com>
 sentence=Lua scripting engine integrated in Arduino for ESP8266
 paragraph=
diff --git a/src/LuaWrapper.cpp b/src/LuaWrapper.cpp
index fb9b551..c2e9436 100644
--- a/src/LuaWrapper.cpp
+++ b/src/LuaWrapper.cpp
@@ -18,10 +18,26 @@ extern "C" {
     delay(a);
   }
 
-  static int lua_wrapper_print(lua_State *lua) {
-    String a = String(luaL_checkstring(lua, 1));
-    Serial.println(a);
-  }
+  static int lua_wrapper_print (lua_State *L) {
+    int n = lua_gettop(L);  /* number of arguments */
+    int i;
+    lua_getglobal(L, "tostring");
+    for (i=1; i<=n; i++) {
+      const char *s;
+      size_t l;
+      lua_pushvalue(L, -1);  /* function to be called */
+      lua_pushvalue(L, i);   /* value to print */
+      lua_call(L, 1, 1);
+      s = lua_tolstring(L, -1, &l);  /* get result */
+      if (s == NULL)
+        return luaL_error(L, "'tostring' must return a string to 'print'");
+      if (i>1) Serial.write("\t");
+      Serial.write(s);
+      lua_pop(L, 1);  /* pop result */
+    }
+    Serial.println();
+    return 0;
+}
 
   static int lua_wrapper_millis(lua_State *lua) {
     lua_pushnumber(lua, (lua_Number) millis());
@@ -31,6 +47,12 @@ extern "C" {
 
 LuaWrapper::LuaWrapper() {
   _state = luaL_newstate();
+
+  luaopen_base(_state);
+  luaopen_table(_state);
+  luaopen_string(_state);
+  luaopen_math(_state);
+
   lua_register(_state, "pinMode", lua_wrapper_pinMode);
   lua_register(_state, "digitalWrite", lua_wrapper_digitalWrite);
   lua_register(_state, "delay", lua_wrapper_delay);
diff --git a/src/lua/lbaselib.c b/src/lua/lbaselib.c
index 6460e4f..1fe8d7d 100644
--- a/src/lua/lbaselib.c
+++ b/src/lua/lbaselib.c
@@ -20,29 +20,6 @@
 #include "lauxlib.h"
 #include "lualib.h"
 
-
-static int luaB_print (lua_State *L) {
-  int n = lua_gettop(L);  /* number of arguments */
-  int i;
-  lua_getglobal(L, "tostring");
-  for (i=1; i<=n; i++) {
-    const char *s;
-    size_t l;
-    lua_pushvalue(L, -1);  /* function to be called */
-    lua_pushvalue(L, i);   /* value to print */
-    lua_call(L, 1, 1);
-    s = lua_tolstring(L, -1, &l);  /* get result */
-    if (s == NULL)
-      return luaL_error(L, "'tostring' must return a string to 'print'");
-    if (i>1) lua_writestring("\t", 1);
-    lua_writestring(s, l);
-    lua_pop(L, 1);  /* pop result */
-  }
-  lua_writeline();
-  return 0;
-}
-
-
 #define SPACECHARS	" \f\n\r\t\v"
 
 static const char *b_str2int (const char *s, int base, lua_Integer *pn) {
@@ -283,16 +260,6 @@ static int load_aux (lua_State *L, int status, int envidx) {
   }
 }
 
-
-static int luaB_loadfile (lua_State *L) {
-  const char *fname = luaL_optstring(L, 1, NULL);
-  const char *mode = luaL_optstring(L, 2, NULL);
-  int env = (!lua_isnone(L, 3) ? 3 : 0);  /* 'env' index or 0 if no 'env' */
-  int status = luaL_loadfilex(L, fname, mode);
-  return load_aux(L, status, env);
-}
-
-
 /*
 ** {======================================================
 ** Generic Read function
@@ -353,22 +320,6 @@ static int luaB_load (lua_State *L) {
 /* }====================================================== */
 
 
-static int dofilecont (lua_State *L, int d1, lua_KContext d2) {
-  (void)d1;  (void)d2;  /* only to match 'lua_Kfunction' prototype */
-  return lua_gettop(L) - 1;
-}
-
-
-static int luaB_dofile (lua_State *L) {
-  const char *fname = luaL_optstring(L, 1, NULL);
-  lua_settop(L, 1);
-  if (luaL_loadfile(L, fname) != LUA_OK)
-    return lua_error(L);
-  lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
-  return dofilecont(L, 0, 0);
-}
-
-
 static int luaB_assert (lua_State *L) {
   if (lua_toboolean(L, 1))  /* condition is true? */
     return lua_gettop(L);  /* return all arguments */
@@ -453,11 +404,9 @@ static int luaB_tostring (lua_State *L) {
 static const luaL_Reg base_funcs[] = {
   {"assert", luaB_assert},
   {"collectgarbage", luaB_collectgarbage},
-  {"dofile", luaB_dofile},
   {"error", luaB_error},
   {"getmetatable", luaB_getmetatable},
   {"ipairs", luaB_ipairs},
-  {"loadfile", luaB_loadfile},
   {"load", luaB_load},
 #if defined(LUA_COMPAT_LOADSTRING)
   {"loadstring", luaB_load},
@@ -465,7 +414,6 @@ static const luaL_Reg base_funcs[] = {
   {"next", luaB_next},
   {"pairs", luaB_pairs},
   {"pcall", luaB_pcall},
-  {"print", luaB_print},
   {"rawequal", luaB_rawequal},
   {"rawlen", luaB_rawlen},
   {"rawget", luaB_rawget},
diff --git a/src/lua/lmathlib.c b/src/lua/lmathlib.c
index 7ef7e59..77e7996 100644
--- a/src/lua/lmathlib.c
+++ b/src/lua/lmathlib.c
@@ -405,6 +405,7 @@ LUAMOD_API int luaopen_math (lua_State *L) {
   lua_setfield(L, -2, "maxinteger");
   lua_pushinteger(L, LUA_MININTEGER);
   lua_setfield(L, -2, "mininteger");
+  lua_setglobal(L, "math");
   return 1;
 }
 
diff --git a/src/lua/lstrlib.c b/src/lua/lstrlib.c
index b4bed7e..e3b5a67 100644
--- a/src/lua/lstrlib.c
+++ b/src/lua/lstrlib.c
@@ -1579,6 +1579,7 @@ static void createmetatable (lua_State *L) {
 LUAMOD_API int luaopen_string (lua_State *L) {
   luaL_newlib(L, strlib);
   createmetatable(L);
+  lua_setglobal(L, "string");
   return 1;
 }
 
diff --git a/src/lua/ltablib.c b/src/lua/ltablib.c
index c534957..3f4ca3e 100644
--- a/src/lua/ltablib.c
+++ b/src/lua/ltablib.c
@@ -256,12 +256,10 @@ typedef unsigned int IdxT;
 ** is to copy them to an array of a known type and use the array values.
 */
 static unsigned int l_randomizePivot (void) {
-  clock_t c = clock();
   time_t t = time(NULL);
-  unsigned int buff[sof(c) + sof(t)];
+  unsigned int buff[sof(t)];
   unsigned int i, rnd = 0;
-  memcpy(buff, &c, sof(c) * sizeof(unsigned int));
-  memcpy(buff + sof(c), &t, sof(t) * sizeof(unsigned int));
+  memcpy(buff, &t, sof(t) * sizeof(unsigned int));
   for (i = 0; i < sof(buff); i++)
     rnd += buff[i];
   return rnd;
@@ -440,6 +438,7 @@ static const luaL_Reg tab_funcs[] = {
 
 LUAMOD_API int luaopen_table (lua_State *L) {
   luaL_newlib(L, tab_funcs);
+  lua_setglobal(L, "table");
 #if defined(LUA_COMPAT_UNPACK)
   /* _G.unpack = table.unpack */
   lua_getfield(L, -1, "unpack");