Circuit Documentation

Summary

This circuit involves an ESP32 microcontroller interfacing with an Adafruit MAX9814 Electret Microphone Amplifier, a Max98357 I2S amplifier, and a speaker. The ESP32 serves as the central processing unit, receiving audio input from the microphone amplifier and sending audio output to the I2S amplifier, which then drives the speaker.

Component List

ESP32-WROOM-32UE

• Description: A powerful microcontroller with integrated Wi-Fi and Bluetooth capabilities.
• Pins: 3v3, EN, VP, VN, 34, 35, 32, 33, 25, 26, 27, 14, 12, GND, 13, D2, D3, 5V, 23, 22, TX, RX, 21, 19, 18, 5, 17, 16, 4, 0, 2, 15, D1, D0, CKL

Adafruit MAX9814 Electret Microphone Amplifier

• Description: A microphone amplifier with automatic gain control.
• Pins: GND, VDD, GAIN, OUTPUT, A/R

Max98357

• Description: An I2S digital-to-analog converter and amplifier.
• Pins: LRC, BLCK, DIN, GAIN, SD, GND, VIN, -, +

Speaker

• Description: A standard speaker for audio output.
• Pins: +, -

Wiring Details

ESP32-WROOM-32UE

• 3v3 is connected to VDD of the Adafruit MAX9814 Electret Microphone Amplifier and VIN of the Max98357.
• 34 is connected to OUTPUT of the Adafruit MAX9814 Electret Microphone Amplifier.
• 25 is connected to LRC of the Max98357.
• 26 is connected to BLCK of the Max98357.
• GND is connected to GAIN and GND of the Max98357, and GND and GAIN of the Adafruit MAX9814 Electret Microphone Amplifier.
• 22 is connected to DIN of the Max98357.

Adafruit MAX9814 Electret Microphone Amplifier

• VDD is connected to 3v3 of the ESP32-WROOM-32UE.
• OUTPUT is connected to 34 of the ESP32-WROOM-32UE.
• GAIN is connected to GND of the ESP32-WROOM-32UE.
• GND is connected to GND of the ESP32-WROOM-32UE.

Max98357

• VIN is connected to 3v3 of the ESP32-WROOM-32UE.
• LRC is connected to 25 of the ESP32-WROOM-32UE.
• BLCK is connected to 26 of the ESP32-WROOM-32UE.
• DIN is connected to 22 of the ESP32-WROOM-32UE.
• GAIN is connected to GND of the ESP32-WROOM-32UE.
• GND is connected to GND of the ESP32-WROOM-32UE.
• - is connected to - of the Speaker.
• + is connected to + of the Speaker.

Speaker

• - is connected to - of the Max98357.
• + is connected to + of the Max98357.

Code

There is no code provided for this circuit.