Audio Codec Breakout - WM8960 Hookup Guide

Contributors: QCPete, bboyho

Example 12: Automatic Level Control

This example builds off of example 5. The difference is that we are adding a trim pot toe the ESP32's analog input and using the measurement to configures the Automatic Level Control (ALC) target value. The ALC will adjust the gain of the PGA input buffer to try and keep the signal level at the target.

Hardware Hookup

Connect power, I²C, line input 1, trim pot, and the headphone output as explained earlier. Your circuit should look similar to the circuit diagram below.

If you have not already, insert a USB cable into your IoT RedBoard ESP32 and a TRS cable from your audio source (e.g. MP3 player, smartphone, or computer) into the audio connector. Then connect your headphones to the output. For those that are sensitive to sounds, you may want to hear the example output before inserting the headphones into your ears.

Upload Code

From the menu, select the following: File > Examples > SparkFun WM8960 Arduino Library > Example_12_AutomaticLevelControl. If you have not already, select your Board (in this case the SparkFun ESP32 IoT RedBoard), and associated COM port. Then hit the upload button.

Open the Arduino Serial Monitor and set it to 115200 baud to view the serial output. Then hit the play button on your audio source. Make sure that the volume from the audio source is turned up. You should hear some music from the headphones.