diff --git a/dmx_usb_module/dmx.pyx b/dmx_usb_module/dmx.pyx
deleted file mode 100644
--- a/dmx_usb_module/dmx.pyx
+++ /dev/null
@@ -1,28 +0,0 @@
-cdef extern from "fcntl.h":
-    int open(char *pathname, int flags)
-    int O_WRONLY
-
-cdef extern from "unistd.h":
-    int write(int fd, void *buf, int count)
-
-cdef extern from "string.h":
-    char *strncpy(char *dest, char *src, int n)
-
-cdef extern from "Python.h":
-    char* PyString_AsString(object string)
-
-cdef class Dmx:
-    cdef int fd
-    def __cinit__(self, port="/dev/dmx0"):
-        self.fd = open(port, O_WRONLY)
-        if self.fd < 0:
-            raise OSError("open failed")
-
-    def write(self, buf):
-        cdef char *cbuf
-        cbuf = PyString_AsString(buf)
-        if cbuf == NULL:
-            raise ValueError("string buffer conversion failed")
-        res = write(self.fd, cbuf, 513)
-        if res < 0:
-            raise OSError("write failed")