March Allwinner Chip Open Source Project Sharing Collection

Allwinner Collection

立创开源硬件平台

GPT Voice Dialogue Cat has two different hardware versions, one of which uses a Linux system for functionality, based on the Allwinner H3 chip Orange Pi Zero development board.

This version consists of a basic Linux Pi and a voice expansion template, very simple. The voice expansion module provides a basic microphone input and an amplifier, while offering a lithium battery charging and discharging system, achieving portability. By modifying the PCB of the voice expansion board, it theoretically supports most Pi boards, with the Orange Pi being chosen mainly for its mini size and good price-performance ratio.

After connecting the voice expansion module, connecting the speaker to ChatGPT allows it to act as a chat-enabled voice assistant. With the function-calling capabilities of ChatGPT, it can perform functions similar to smart speakers like Xiao Ai.

AXP2101 is widely used as a PMIC in products from well-regarded companies in the maker community such as LilyGO and M5Stack, and there is a GitHub repository maintained by prominent figures that includes Linux drivers, Arduino libraries, ESP-IDF examples, MicroPython examples, PlatformIO examples, etc. The author also chose AXP2101 to upgrade past projects based on AXP202/AXP173 chips.

The hardware upgrades mainly focus on: to facilitate PCB design and soldering, and increase success rates, this design adopts a modular approach, encapsulating the AXP202 peripheral circuitry into a postage stamp module soldered onto the main board, exposing all user-definable pins, greatly simplifying the chip’s peripherals (only inductors and capacitors), increasing multiple power supplies, simplifying wiring, and reducing chip packaging size by merging ACIN and VBUS into one input.

The software and register upgrades mainly focus on: the built-in battery measurement algorithm accurately calculates battery power through the built-in coulomb counter and voltmeter, existing in REG A4 (can be read directly from the register without any conversion), higher optional charging current (charging mode can customize linear charging and switch charging), and more refined configuration of various functions.