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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
That's really odd. Your wiring seems to match the book just fine to me.
You could try setting it up as a potential divider - so with:
The fact that siri gets triggered makes me think it is getting some signal though...
If you have one, what happens if you plug an actual pair of headphones with microphone in into the Mac? Is the menu different? It may be the input is working but just not showing up?