走马观花

I2S AUDIO SHIELD_V3

Overview

An expansion board designed for the ESP32 PICO D4 development board with lithium battery power supply and I2S audio power amplifier function.
The charging chip is the commonly used TP4056. Due to size limitations, large batteries cannot be used, so the charging current must be limited through R1.
The audio chip is MAX98357AETE, which is small and can set the gain and select the channel. In this project, the GAIN pin is left floating and the gain is 9dB. The MODE pin is pulled up through a 1M resistor to make the chip work in (Left+Right)/2 mode, which is two-channel synthesis.
There is a toggle switch onboard to adjust the volume and other functions. Two voltage collection points can realize battery voltage collection and determine whether to charge or not.
The speaker is the external speaker of iPHONE7, which can be found in mobile phone repair shops. It is fixed on the circuit board with 1.8MM screws.

ESP32_PICO_D4+ST7735 development board V3 address: https://oshwhub.com/yiplay/esp32_pico_d4-st7735-kai-fa-ban-v3

Design Files

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Update:2025-06-24 16:35:18

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