Then you'll need Android Meets Robots, an app that lets you pair voice recognition with any Bluetooth module. From there, it's just about pairing the two together and creating your own commands.

Of the 255 commands it can store it can load 7 at a single time. The max recording time is 1.5 seconds per command. If the main board you use to control everything (Arduino, RPi, ESP32, etc ...

The phone uses an app that talks to the Arduino via Bluetooth, which means the Arduino needs a Bluetooth module. The Arduino controls what amounts to an upside-down 3D printer.

The Butler holds a large audio vocabulary, wireless capability (NRF24L01+ and Bluetooth), an 8×8 LED matrix, a relay that is able to control high power devices, a 10-button ADC keypad, 8x DIP ...