Circuit Documentation

Summary

This circuit integrates various components to create a system capable of audio input and output, along with data storage capabilities. The core of the system is an ESP32 Devkit V1 microcontroller, which manages the input from a microphone amplifier, controls audio output to a loudspeaker through a digital audio interface, and interfaces with a Micro SD Card Module for data storage. A pushbutton is included for user input.

Component List

ESP32 Devkit V1

• Description: A microcontroller development board based on the ESP32 chip, featuring Wi-Fi and Bluetooth connectivity, along with a variety of GPIO pins for interfacing with other components.
• Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN

Micro SD Card Module

• Description: A module that allows an SD card to be read from and written to, typically used for data logging or storage.
• Pins: cs, sck, mosi, miso, vcc, gnd

Loudspeaker

• Description: An electroacoustic transducer that converts an electrical audio signal into a corresponding sound.
• Pins: pin1, pin2

Adafruit MAX98357A

• Description: A digital audio interface that converts digital audio to an analog signal for a loudspeaker.
• Pins: VIN, GND, SD_MODE, GAIN, DIN, BCLK, LRCLK, VO+, VO-

Adafruit MAX9814 Electret Microphone Amplifier

• Description: A microphone amplifier module with automatic gain control for consistent audio input levels.
• Pins: GND, VDD, GAIN, OUTPUT, A/R

Pushbutton

• Description: A simple switch mechanism for controlling some aspect of a machine or a process.
• Pins: Pin 3 (out), Pin 4 (out), Pin 1 (in), Pin 2 (in)

Wiring Details

ESP32 Devkit V1

• 3V3: Connected to VDD of the Microphone Amplifier, VCC of the Micro SD Card Module, VIN of the MAX98357A, and Pin 3 (out) of the Pushbutton.
• GND: Common ground with the Microphone Amplifier, Micro SD Card Module, and MAX98357A.
• D2: Connected to Pin 2 (in) of the Pushbutton.
• D5: Connected to CS of the Micro SD Card Module.
• D18: Connected to SCK of the Micro SD Card Module.
• D19: Connected to MISO of the Micro SD Card Module.
• D23: Connected to MOSI of the Micro SD Card Module.
• D25: Connected to DIN of the MAX98357A.
• D26: Connected to LRCLK of the MAX98357A.
• D27: Connected to BCLK of the MAX98357A.
• D35: Connected to OUTPUT of the Microphone Amplifier.

Micro SD Card Module

• cs: Connected to D5 of the ESP32 Devkit V1.
• sck: Connected to D18 of the ESP32 Devkit V1.
• mosi: Connected to D23 of the ESP32 Devkit V1.
• miso: Connected to D19 of the ESP32 Devkit V1.
• vcc: Connected to 3V3 of the ESP32 Devkit V1.
• gnd: Common ground with the ESP32 Devkit V1.

Loudspeaker

• pin1: Connected to VO- of the MAX98357A.
• pin2: Connected to VO+ of the MAX98357A.

Adafruit MAX98357A

• VIN: Connected to 3V3 of the ESP32 Devkit V1.
• GND: Common ground with the ESP32 Devkit V1.
• DIN: Connected to D25 of the ESP32 Devkit V1.
• BCLK: Connected to D27 of the ESP32 Devkit V1.
• LRCLK: Connected to D26 of the ESP32 Devkit V1.
• VO+: Connected to pin2 of the Loudspeaker.
• VO-: Connected to pin1 of the Loudspeaker.

Adafruit MAX9814 Electret Microphone Amplifier

• VDD: Connected to 3V3 of the ESP32 Devkit V1.
• GND: Common ground with the ESP32 Devkit V1.
• OUTPUT: Connected to D35 of the ESP32 Devkit V1.

Pushbutton

• Pin 3 (out): Connected to 3V3 of the ESP32 Devkit V1.
• Pin 2 (in): Connected to D2 of the ESP32 Devkit V1.

Documented Code

No code has been provided for the microcontrollers in the circuit. The documentation of the code would typically include descriptions of the functionality implemented, setup and loop functions for Arduino-based microcontrollers, and any libraries or external resources used. Since no code is available, this section remains empty.