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Re: LF: OT, Remote site, garden progress

To: [email protected]
Subject: Re: LF: OT, Remote site, garden progress
From: DK7FC <[email protected]>
Date: Sat, 13 Sep 2014 21:58:05 +0200
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Hm, i don't understand all of what you're writing here. No idea of that unix stuff but more general, what exaxtly are you doing at all?
Raspi, OK, understood.
Which kind of data do you transfer? A certain RF spectrum? From which to which frequency? What kind is the ADC? Are you using a ready to use USB soundcard or a single ADC connected to the RPI, via SPI oder so? Data rate, bits, SNR?
Streaming via cable or via a RF link?
I have to ask more detailed when my project is running too...

73, Stefan

Am 13.09.2014 18:16, schrieb LZ:
Hi,

News from Wolfson audio on the R-Pi:

Using an ultra fast SD-card silently "borrowed" from
Daddy those overruns from Wolfson audio were still
present but less often and way shorter.

OK, next writing into the unix toilet:
arecord -Dhw:0 -r 192000 -c 2 -f S16_LE /dev/null

Fine, no glitches after hours of recording!

Next trial was piping the output via ssh to
my desktop computer:
arecord -Dhw:0 -r 192000 -c 2 -f S16_LE - | ssh [email protected] 'cat>  
from_rpi.wav'

A growing file named "from_rpi.wav" appeared
in my home directory on the desktop computer.
"arecord" consumes only 1% of cpu load and
the piping secure shell process 19%. Stopped
this when the file size had reached 1 Gb.

NO overruns were noticeable after the connection had been
established. So piping aka "streaming" should work.

BTW after a loud "bang" and some smell from amperes
I'm running the R-Pi (B-type) from a current limiting power
supply now. 5.2 Volts and only 400-500 mA all inclusive.

Laura

PS: "dd-ing" Daddy's very private videos back now...

Sent from my LoranPhone



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