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by visualecho
Mon Apr 27, 2015 10:20 pm
Forum: Compute Module
Topic: Multi Server CM Board
Replies: 22
Views: 3854

Re: Multi Server CM Board

Beautiful... this is completely acceptable for my purposes. Thank you kindly for the responses. > 960MHz Ouch, I'll have to upgrade my Tektronix 475. >with the GND layer as close as possible to the signals Yes, I noticed that you got great results with a 0.2mm pre-preg layer. Seems kinda obvious now...
by visualecho
Mon Apr 27, 2015 1:41 am
Forum: Compute Module
Topic: Multi Server CM Board
Replies: 22
Views: 3854

Re: Multi Server CM Board

Why use a two layer board? I have a question... I read the posts on the Compute Module Test Board, and I'm wondering what would *actually* happen if you had stayed with a two layer design? I'm designing a compute module board that's 80mm x 100mm, has no LAN chip, and also has the host USB connector...
by visualecho
Sun Feb 16, 2014 7:42 pm
Forum: C/C++
Topic: Microdriver for continuous motion servo using pwm
Replies: 8
Views: 2659

Re: Microdriver for continuous motion servo using pwm

Thank you! This makes a little more sense now. I greatly appreciate your quick reply, I'm going to get a lot of work done today. I like the 'square this circle' analogy. Computers are made of metal and glass and plastic and magic smoke and little crystal bits of melted sand, but it only does what we...
by visualecho
Sun Feb 16, 2014 5:42 pm
Forum: C/C++
Topic: Microdriver for continuous motion servo using pwm
Replies: 8
Views: 2659

Re: Microdriver for continuous motion servo using pwm

NO. Thank you for the idea, sir, and I greatly appreciate the feedback, but I don't think that solution is correct for this application. Why, when I suggest reasons to avoid a more expensive and complex solution, would you sieze on that? It is not always acceptable to jump to more expensive methods ...
by visualecho
Sat Feb 15, 2014 5:10 pm
Forum: C/C++
Topic: Microdriver for continuous motion servo using pwm
Replies: 8
Views: 2659

Re: Microdriver for continuous motion servo using pwm

Thank you again, this is another possibility. Programming that timing in python doesn't seem to work very well for me, the amount of play for even a single additional pulse whacks the accuracy. Every pulse the continuous rotation servo gets, it turns a little bit one way or the other. 0.022 seconds ...
by visualecho
Sat Feb 15, 2014 2:33 am
Forum: C/C++
Topic: Microdriver for continuous motion servo using pwm
Replies: 8
Views: 2659

Re: Microdriver for continuous motion servo using pwm

That pigpio code looks pretty good. In fact it's awesome and pretty much what I needed. Also not sure what I was doing with pi-blaster before, but can't reproduce today. When pi-blaster terminates, it leaves the system blasted, no audio. I checked my command history, not sure what I did to convince ...
by visualecho
Fri Feb 14, 2014 1:47 am
Forum: C/C++
Topic: Microdriver for continuous motion servo using pwm
Replies: 8
Views: 2659

Microdriver for continuous motion servo using pwm

I'm interested in programming a 'C' extension to python which drives a continuous motion servo. I've got the python extension routines to call a function in 'C', and now need to write that function. The function needs to toggle a specific number of positive pulses on GPIO 18 (physical pin 12) of aro...

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