The Nest Hello video doorbell in the UK

As a result of s new boiler installation recently I wanted a smart thermostat as part of the installation. I’ll be honest that I’m a bit of a Google fan when it comes to smart things, and having looked at various devices decided Nest, with it’s Google heritage, was the one I wanted.

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3D Printable Rear Case Cover for Raspberry Pi + Wolfson Card + PiHut case

I drafted a design for a new rear case cover for the Pi Hut case for the Raspberry Pi official 7″ touchscreen

The Wolfson Card I fitted here prevents fitting of the original rear case cover, so I drafted up a quick design in Tinkercad and a work colleague 3D printed it for me.

The design is shared on Tinkercad, so feel free to use and modify for your own use.

Posted in Engineering, Gadgets, Music, Streaming | 1 Comment

The Wolfson Sound Card Noise Gate and 24 bit Data

Recently I did some measurements on the Wolfson card to get an idea of the dynamic range. When playing a 24bit file @ -100dBfs there was no output from the card.

This was perplexing, as the noise floor is some 20-30dB below that.

I set about making an amplitude sweep test file, sweeping from -60dBfs to -144dBfs and then playing that back on the Wolfson. At -90dB the output would vanish!

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