Audio Codec – Output Sine Wave

Materials

  • AmebaD [AMB21 / AMB22 / AMB23] x 1

  • 3.5mm TRS/TRRS breakout x 1 (e.g., Adafruit 2791 / Sparkfun 11570)

Example

Procedure

AMB21 / AMB22 Wiring Diagram:
Connect the 3.5mm connector to the RTL8722 board following the diagram.

1

AMB23 Wiring Diagram:
As AMB23 have a built in microphone on the board, there is no need for any external microphone.

Open the example, "Files" → "Examples" → “AmebaAudioCodec” → “OutputSineWave”.

2

Upload the code and press the reset button on Ameba once the upload is finished.
Connect a pair of wired headphones to the 3.5mm audio jack and you should hear the generate single sinusoidal tone.