Codec Zero is a Raspberry Pi Zero sized board but it also includes the HAT EEPROM allowing for auto configuration of the Linux environment if needed.

The Codec Zero delivers bi-directional digital audio signals (I2S) between the Raspberry Pi and onboard Dialog Semiconductor DA7212. Supporting a range of input and output devices from built in MEMS microphone, mono Electret microphone or mono speaker (1.2W / 8Ω).

It also has GREEN (GPIO23) and RED (GPIO24) LEDs, that can be used for status and a tactile button (GPIO27) that can be used to start an event.

The Codec Zero makes a great starting point for a walkie talkie / intelligent doorbell, vintage radio hack or Smart type speaker.