Rhasspy is an open source, fully offline voice assistant toolkit

Does anyone know if this is viable on a pi zero?

This is really cool!

Does anyone know if there's a way to hack an Echo Dot and use it as the speaker/mic for Rhasspy? Rolling out our own hardware that is as effective as a Dot would probably be very difficult?

I recently came across Rhasspy, and while I haven't had time to play with it, I'm super excited. Often I like the sound of certain projects but want to plug in my own parts. Rhasspy appears to glue all the parts of a modern voice assistant together, but let you swap out any of the parts.

Short answer: Nope.

Long Answer: Not even kinda close to a way to do this, that hardware is locked down good. If you can brute force the key that locks the adb/fastboot then you have a chance.

Some of the echo's run android, so you'd need to make Rasspy run on android for those versions of the echo. Alternatively, you'd have to find the versions of the echo that runs a proper linux flavor, you might have a chance there.

If you really start messing with the operating system or system software, you have to make sure that you can access the mics in software. (some of) their mic array and ADC array feature FPGAs that handle audio manipulation, so you'd need drivers/whatever to interface with those.

This looks like a lot of fun to hook up to something like this 6 mic hat for the Raspberry Pi

https://respeaker.io/6_mic_array/