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by ewaller
Wed Oct 05, 2016 4:47 pm
Forum: Off topic discussion
Topic: Freefall
Replies: 38
Views: 4669

Re: Freefall

Consider this. An accelerometer sitting upright on the surface of the Earth will show a 1g acceleration. What happens when you turn it upside down? it will show a -1g acceleration. If that accelerometer is one of three orthogonal accelerometers in a three axis instrument, the other two will read zer...
by ewaller
Wed Oct 05, 2016 4:32 pm
Forum: Automation, sensing and robotics
Topic: Question about about servos (jitter/buzzing/struggling)
Replies: 11
Views: 3210

Re: Question about about servos (jitter/buzzing/struggling)

Do you have a scope to see if the control output is jittering?
If you dampen the servo output with a finger, do they settle down?
Is you program continually writing to the port, or does it only write when a change needs to be made?
by ewaller
Wed Oct 05, 2016 4:27 pm
Forum: General programming discussion
Topic: Serial Open/Close question (PigPio/wiringPI)
Replies: 4
Views: 1049

Re: Serial Open/Close question (PigPio/wiringPI)

Any harm to either method? Some ports use hardware handshaking (DSR, DTR, RTS, CTS). When the ports are closed, the kernel will de-assert the output signals telling an external device that it is not okay to send. Some devices may react in unexpected ways to these signals being de-asserted and re-as...
by ewaller
Wed Oct 05, 2016 4:20 pm
Forum: Beginners
Topic: Dumping nodejs, studying python
Replies: 4
Views: 1345

Re: Dumping nodejs, studying python

You may want to look into twisted http://twistedmatrix.com/trac/

It is a framework written in Python that makes creating dynamic web pages a snap.
Note that I use this framework, but have no other affiliation with them.
by ewaller
Tue Oct 04, 2016 10:52 pm
Forum: Off topic discussion
Topic: Freefall
Replies: 38
Views: 4669

Re: Freefall

Heater wrote:...Presumably if it falls far enough in air it will reach a terminal velocity.

Does it then read 1g of acceleration?

I presume it does.
Yes.
by ewaller
Tue Oct 04, 2016 6:19 pm
Forum: Advanced users
Topic: Real time data display over the internet
Replies: 2
Views: 700

Re: Real time data display over the internet

You did not indicate what your sample rate is; are talking samples every couple seconds, a few samples/second, thousands of samples/second?

Another simple approach would be to use Python and Twisted to generate dynamic json files and serve them over http.
by ewaller
Tue Oct 04, 2016 5:52 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3815
Views: 279663

Re: Introduce yourself!

Hello, First post, so I may as well get the first post moderation out of the way. I am a an engineer and long time Linux user. I am active in the Arch Linux community. I use Archliunux Arm on my RasPi early model 1A. Yesterday I set up an new 3b with Raspian. Figured I may as well register and see w...

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