Raspberry Pi: driving a VU meter using a digital-to-analog converter

As I've mentioned in previous blog articles, my wife and I have been working on driving an analog VU meter based on the sound going out the Raspberry Pi's audio outputs. This now works!

Here's a video demonstrating the result:

The music [1] is playing from a Raspberry Pi, with software running on the Pi digitally sampling the peak output audio level and writing that out to an 8-bit digital-to-analog converter (DAC). The DAC output is then used to drive the analog meter. If you're interesting in knowing how all this hangs together, keep reading.

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posted: Mon, 06 May 2013 23:40 | permalink | comments