diff --git a/light9/io/udmx.py b/light9/io/udmx.py
new file mode 100644
--- /dev/null
+++ b/light9/io/udmx.py
@@ -0,0 +1,50 @@
+from __future__ import division
+import usb.core
+from usb.util import CTRL_TYPE_VENDOR, CTRL_RECIPIENT_DEVICE, CTRL_OUT
+
+"""
+Send dmx to one of these:
+http://www.amazon.com/Interface-Adapter-Controller-Lighting-Freestyler/dp/B00W52VIOS
+
+[4520784.059479] usb 1-2.3: new low-speed USB device number 6 using xhci_hcd
+[4520784.157410] usb 1-2.3: New USB device found, idVendor=16c0, idProduct=05dc
+[4520784.157416] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
+[4520784.157419] usb 1-2.3: Product: uDMX
+[4520784.157422] usb 1-2.3: Manufacturer: www.anyma.ch
+[4520784.157424] usb 1-2.3: SerialNumber: ilLUTZminator001
+
+See https://www.illutzmination.de/udmxfirmware.html?&L=1
+    sources/commandline/uDMX.c
+or https://github.com/markusb/uDMX-linux/blob/master/uDMX.c
+"""
+
+cmd_SetChannelRange = 0x0002
+
+class Udmx(object):
+    def __init__(self):
+        self.dev = usb.core.find(idVendor=0x16c0, idProduct=0x05dc)
+        
+    def SendDMX(self, buf):
+        ret = self.dev.ctrl_transfer(
+           bmRequestType=CTRL_TYPE_VENDOR | CTRL_RECIPIENT_DEVICE | CTRL_OUT,
+           bRequest=cmd_SetChannelRange,
+           wValue=len(buf),
+           wIndex=0,
+           data_or_wLength=buf)
+        if ret < 0:
+            raise ValueError("ctrl_transfer returned %r" % ret)
+
+
+def demo(chan, fps=44):
+    import time, math
+    u = Udmx()
+    while True:
+        nsin = math.sin(time.time() * 6.28) / 2.0 + 0.5
+        nsin8 = int(255 * nsin)
+        try:
+            u.SendDMX('\x00' * (chan - 1) +
+                      chr(210) +
+                      chr(nsin8) + chr(nsin8) + chr(nsin8))
+        except usb.core.USBError as e:
+            print "err", time.time(), repr(e)
+        time.sleep(1 / fps)
diff --git a/pydeps b/pydeps
--- a/pydeps
+++ b/pydeps
@@ -28,3 +28,4 @@ scales==1.0.9
 statprof==0.1.2
 txzmq==0.7.4
 
+pyusb==1.0.0