diff --git a/main.c b/main.c
index cbae3ad..eeec118 100644
--- a/main.c
+++ b/main.c
@@ -176,6 +176,16 @@ int main(int argc, char **argv) {
   if(!lua_isnumber(L, -1)) return 2;
   int center_module = lua_tointeger(L, -1);
 
+  // export some global constants
+  lua_pushnumber(L, SAMPLE_RATE);
+  lua_setglobal(L, "SAMPLE_RATE");
+
+  lua_pushnumber(L, BLOCK_LEN);
+  lua_setglobal(L, "BLOCK_LEN");
+
+  lua_pushnumber(L, DATALEN);
+  lua_setglobal(L, "DATALEN");
+
   // allocate arrays
   red = malloc(num_modules * sizeof(double));
   green = malloc(num_modules * sizeof(double));