[time-nuts] Arduinos in time and near space

[Jim Lux]

On 1/20/14 6:15 PM, Chris Albertson wrote:
> On Mon, Jan 20, 2014 at 6:54 AM, Jim Lux <jimlux at earthlink.net> wrote:
>
>> On 1/19/14 10:31 PM, Chris Albertson wrote:
>>
>>> On Sun, Jan 19, 2014 at 6:41 PM, Lizeth Norman <normanlizeth at gmail.com
>>>> wrote:
>>>
>>>
>> This is why I am a fan of the Teensy3... It's a Freescale micro based on
>> ARM cortex, and fast, low power, etc.
>>
>> However, I happened to have an Arduino sitting in front of me on the table
>> on Saturday when this started.
>>
>> The computer you've got is better than the one you have to order and wait
>> for.
>

>
> Thanks for the pointer to "teensy3"  I did not know they were using ARM.

they are very cool..

> I'm going to look into this because I'm
> adding a Kalman filter in a project that is now Arduino based It's working
> out to be a 12x12 matrix.   I'm not at all sure the little AVR chip and do
> floating point math fastest enough to run a Kalman filter that large inside
> a even a slow 1Hz control loop.
>
I suspect it would.  I'm running a 50 MHz teensy3 and a pair of 19 tap 
FIR filters at 200 Hz (actually after decimating from 50kHz, but the two 
stage decimator is an integer CIC type).




> I was thinking I Wanted  Beagle Board Black.  But if the navigation Kalman
> filter and motor control PID loop fit on a Teensy I've by better off.
>   Eventually I need something that can run a real-time version of Linux.
>
> Back on topic:  Arduino contributed code includes a Time library that can
> input time using NTP over Ethernet and from the German version of WWVB as
> well as a few other methods of time transfer.  So there appears no need to
> re-invent time transfer into an Arduino.
>

yes.. and that runs on a teensy, as well.