v32

11

10-Dec-2020

9. Codec Zero

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.

Stereo AUX IN

Power LED

Mono Speaker

Stereo AUX OUT

GREEN LED

(GPIO23)

MEMS Mic2

Mono Mic1 (Electret)

Button (GPIO27)

RED LED (GPIO24)

P1 and P2 will support external PHONO / RCA sockets if needed. P1: AUX IN, P2: AUX OUT.

Pin 1 is square:

1: Left

2: Ground

3: Right

4: Ground