The snd_card_power_meter from jackkelly

split each audio recording into hour-long files
when the time comes to create a new recording:
- close the previous file
- open a new file
- first check the previous compression task completed. Then subprocess to call ffmpeg to compress the previous recording to FLAC

There are Python audio libraries e.g.:

http://pymedia.org/ (doesn't appear to have been updated since 2006)
http://audiotools.sourceforge.net/ (last updated in late 2012. Doesn't have entry on PyPI)
https://github.com/jiaaro/pydub/ (updated recently and has entry on PyPI)

But I don't want to have to load the entire previous file into memory in Python. Instead I want to just fire off an ffmpeg instance to compress the file.

Downsample to a wav file

Check audioop source code to make sure it down samples

Use proper logging

replace most of the print() statements with log statements

Can we inject timestamps into the WAV / FLAC files?

Handle errors from WattsUp

e.g.
wattsup: [error] Blech. Giving up on read: Bad address
wattsup: [error] Reading final time stamp: Bad address

Better variable naming

"volts" -> "voltage" if it isn't in units of volts
"amps" -> "current" if it isn't in units of amps!

Why don't we get "program not found" error when trying to run sox when it isn't installed

If sox isn't installed then we just get this error:

13-03-16 09:00:01 WARNING start WARNING: Previous conversion FAILED: sox --no-dither vi\
-1363417200.348878.wav --bits 24 --compression 8 vi-1363417200.348878.flac rate -v -L 1\
6000 && rm vi-1363417200.348878.wav
13-03-16 09:00:01 INFO start Running: sox --no-dither vi-1363420800.549942.wav --bits 2\
4 --compression 8 vi-1363420800.549942.flac rate -v -L 16000 && rm vi-1363420800.549942\
.wav

Why don't we get the full error message?

Make sure code which works out when to compress handles BST changes

Use zero crossings to calibrate phase difference

and update name of exceptions

Don't output phase difference to mains.dat

Seems to have died on March 31st

-rw-r--r--   1 root root 187M Mar 30 17:05 vi-2013_03_30_16_00_00_636767.flac
-rw-r--r--   1 root root 189M Mar 30 18:05 vi-2013_03_30_17_00_00_450238.flac
-rw-r--r--   1 root root 190M Mar 30 19:05 vi-2013_03_30_18_00_00_669354.flac
-rw-r--r--   1 root root 193M Mar 30 20:05 vi-2013_03_30_19_00_00_889285.flac
-rw-r--r--   1 root root 194M Mar 30 21:05 vi-2013_03_30_20_00_00_64461.flac
-rw-r--r--   1 root root 189M Mar 30 22:05 vi-2013_03_30_21_00_00_817415.flac
-rw-r--r--   1 root root 187M Mar 30 23:05 vi-2013_03_30_22_00_00_759095.flac
-rw-r--r--   1 root root 187M Mar 31 00:05 vi-2013_03_30_23_00_00_999147.flac
-rw-r--r--   1 root root 2.1G Mar 31 02:33 vi-2013_03_31_00_00_00_962376.wav

jack@jack-logger:/usr/local/logger/snd_card_power_meter$ tail *.log
13-03-31 05:27:27 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:27:27 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:27:41 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:27:41 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:28:01 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:28:01 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:28:02 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:29:15 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:29:20 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-31 05:29:28 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981

probably a BST problem

auto-enable capture

Circuit diagram

Rewrite tests after refactoring

in get_adc_data: retry if IOerror

Try importing flac and doing power calculations and also compare waveforms

Store mixer settings in config file with calibration data

But mixer settings must be loaded before calibration.

Automatically calibrate using wattsup

Run both V and i together

Experiment with using audioop.findfit to find phase difference

The current (I) data is just too nuts to try to calculate a phase difference using zero crossings or peaks.

One possible solution:

For 1 second of data, try to fit the voltage waveform to the current waveform using audioop.findfit().

BEFORE PUTTING ANY EFFORT INTO THIS: see if SMETS 2 specifies four quadrant recording or not

jack@dave-logger:/usr/local/logger/snd_card_power_meter/scripts$ sudo ./plot.py
13-04-09 19:29:48 INFO Starting up...
13-04-09 19:29:48 INFO Opening Sampler...
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_dmix.c:957:(snd_pcm_dmix_open) The dmix plugin supports only playback stream
13-04-09 19:29:48 INFO Successfully opened Sampler.
13-04-09 19:29:48 INFO Running sampler...
13-04-09 19:29:48 INFO Opening calibration file...
13-04-09 19:29:48 WARNING Error loading option from config file: No section: 'Calibration'
13-04-09 19:29:49 INFO Terminating Sampler
Traceback (most recent call last):
  File "./plot.py", line 38, in <module>
    main()
  File "./plot.py", line 29, in main
    adc_rms, calibration)
  File "/usr/local/logger/snd_card_power_meter/snd_card_power_meter/scpm.py", line 152, in calculate_calibrated_power
    data.real_power = inst_power.mean() * calibration.watts_per_adc_step
AttributeError: 'NoneType' object has no attribute 'watts_per_adc_step'

WARNING get_adc_data ERROR: [Errno Input overflowed] -9981

13-03-16 09:01:53 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:14:29 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:17:17 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:19:36 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:21:35 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:22:13 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:25:06 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:26:18 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:26:37 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:37:56 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981
13-03-16 09:47:06 WARNING get_adc_data ERROR: [Errno Input overflowed] -9981

Also move it on Dave's PC (if it's still there in college!)

jackkelly / snd_card_power_meter Goto Github PK

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