diff -r 69c2a1408619 -r a399f9d5e672 carrerashark/README
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/carrerashark/README	Fri Nov 18 12:16:22 2011 +0100
@@ -0,0 +1,18 @@
+CarreraShark
+Rail data packet sniffer
+
+Hardware: Mega16, 8mhz
+    PD2 = Controller Input
+    |>o = Inv Schmitt Trigger for signal buffering (74hc14)
+
+    [RAIL+] ------[33kohm]------+-----|>o--|>0----[PD2]
+                                |
+                                --[10kohm]---
+                                            |
+    [RAIL-] --------------------------------+-----[GND]
+
+
+Debug Pins:
+    PD3 = Packet Start pulse
+    PD4 = Bit timer pulse (50ns)
+    PD5 = Cycle Sync: each low/high change == start of cycle (after program packet received)
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