https://slickdeals.net/f/13349932-blue-microphones-snowball-usb-microphone-white-39-free-shipping This works with Raspberry Pi pretty well.
This article is good but it doesn’t mention downloading, building and installing pocketsphinx, only sphinxbase. https://medium.com/@ranjanprj/for-some-time-now-i-have-been-thinking-really-hard-to-build-a-diy-study-aid-for-children-which-uses-17ce90e72f43 I got it working after following the additional instructions here: https://cmusphinx.github.io/wiki/tutorialpocketsphinx/
6.1 Retrofit basics Retrofit (https://square.github.io/retrofit) is a library written by Square, which makes working with HTTP(S) APIs a breeze. You define an interface in Kotlin, which specifies the REST connection to the server. REST is a way to communicate with servers in an idiomatic way. You can then use this interface and a class you …
This explains how to wire a linear actuator to a relay, arduino, and battery.
I ordered this motor: uxcell DC 12V 7RPM 50Kg.cm Self-Locking Worm Gear Motor with Encoder and Cable, High Torque Speed Reduction Motor https://www.amazon.com/gp/product/B078J521TG I have an Arduino Uno and a 12 Volt battery supply from 8 AA batteries from my previous project. I found a few tutorials: Tutorial for DC Gear Motor With Encoder https://www.instructables.com/id/Tutorial-for-DC-Gear-Motor-With-Encoder/ …