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Creating a volume indicator

Tilman Koster

January 01, 2018 11:52

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Dear Community and Hifiberry team,

 

a while back I got myself a Hifiberry and I am really happy ever since. In fact I decided to strip down my hifi gear and also the preamp had to leave. The Hifiberry is feeding my DSP directly from where the signal goes further to the poweramps. I use KODI on the Pi and Yatse on my phone. Really I almost do not need more. Just one thing: a feedback on the level of the volume. I am planning to build some kind of rack for the poweramps including a volume meter but I am not good with electronics. Could I use something like this:

 

https://www.aliexpress.com/item/The-40-section-column-VU-table-module-for-audio-signal-level-indicator-sense-of-volume/32710070893.html?spm=2114.10010108.1000013.1.7f2b050dbYGmKv&traffic_analysisId=recommend_2088_1_90158_iswistore&scm=1007.13339.90158.0&pvid=2b4ef714-d961-44a5-a536-bc237e90ff02&tpp=1

 

It sound promising from the description but where do I need to grab the signal without influencing the sound quality? Is it even possible?

 

Many thanks in advance!!

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2 comments

• 0
  
  Tilman Koster January 01, 2018 12:33

  To make it more clear I should add that I just want to display the chosen volume level. As far as I know the Hifiberry has an output of 0 to 2mV. So at 0 (no sound) there is no LED active and at 2 mV the bar shines to the end. I do not want a peak level meter or something like that. Just a simple volume meter like KODI shows in the upper right corner when I change the volume.

• 0
  
  HiFiBerry team January 02, 2018 10:06

   

  This device will show you the output level, not what volume you have selected in Kodi. To do this, you can add some LEDs to unused GPIOs and program a small script that reads out the volume setting from Kodi and sets the LEDs.

  Best regards,
  Daniel