Search found 4 matches

by jonnymac
Sun Mar 30, 2014 11:53 am
Forum: The Spin Zone
Topic: Updated Dynamixel Driver
Replies: 0
Views: 4449

Updated Dynamixel Driver

Forgive me, friends, I am guilty of doing a "pretty it up" process after testing code, and -- sadly -- on a few occassions I have introduced a bug doing this. I did with my Dynamixel driver in the sync_write() method. Attached is an update to the driver and the demo. The demo is the same except that...
by jonnymac
Mon Jan 20, 2014 1:45 pm
Forum: The Spin Zone
Topic: Use of pull-ups in March 2013 Spin Zone circuit
Replies: 2
Views: 2982

Re: Use of pull-ups in March 2013 Spin Zone circuit

You can use 3.3v -- I used 5v to simplify connections. The only caveat is the size of the pull-up which limits the current into the pin when the transistors are not conducting. With 5v the should be at least 3.3K. As we tend to use 10K for pull-ups, we're well in the clear.
by jonnymac
Mon Jan 20, 2014 1:33 pm
Forum: The Spin Zone
Topic: Human Friendly Control Protocol (HFCP)
Replies: 1
Views: 2821

Re: Human Friendly Control Protocol (HFCP)

Sorry, I haven't visited these boards in ages as I tend to hang out in the official Propeller forums on Parallax. Having read and considered your comments, I believe you may be correct. HFCP is in use in a commercial system without issues, and I'm presently designing it into another -- this gives me...
by jonnymac
Fri Sep 02, 2011 11:19 am
Forum: The Spin Zone
Topic: Hello
Replies: 0
Views: 2520

Hello

I'm Jon "JonnyMac" McPhalen (formerly Williams), author of "The Spin Zone." My column, of course, is devoted to programming and designing circuits for the Parallax Propeller chip (P8X32A). Most programs are written in Spin (the high-level language) but, on occasion, we delve into Propeller Assembly ...