View Single Post
Old Mar 13, 2010, 09:25 PM
iter is offline
Find More Posts by iter
iPhly R/C with iPhone
iter's Avatar
Silicon Valley, Calif
Joined Jan 2005
1,729 Posts
Thank you for sharing your intuition on different latencies in your system, and your difficulty in measuring them.

Before you decide how you can measure something, you must decide what you want to measure. "Complete lag" may mean time between when you move a stick and when a servo reaches its new position. It can be the time from when you buffer your packet to when the the transmitter parses it. It can be many other things, and they all lend themselves to different measurement techniques. You may even decide to measure the feeling you get: "instant" vs. "not instant". In any case, if you can't formally describe what you are measuring, it doesn't mater how you measure it.

I reiterate my invitation to post an oscillogram of a 384kHz square wave you generate from your sound card. You already have a formal parameter to measure and already know the technique for measuring it.

Ari.
iter is offline Find More Posts by iter
Reply With Quote