To allow the experimental usage of the MP3 module, without the need to create sophisticated electronic circuits, we have produced the demo circuit. This demoboard shows how to easily interact with the reproducer, by supplying the needed power by means of a dedicated PWR connector or, as an alternative, by means of a USB input.

There are both the input and the output connectors for Line-In and Line-Out (and named IN and OUT), and 5 buttons, of which 4 can be programmed as required. Reset is dedicated to the reproducer’s hard-reset, while P1, P2, P3 and P4 can be programmed as desired. For a quick interaction we suggest to use the configuration file attached to the project, as it proves to be already adjusted to offer the following functionalities: serial communication in CLI mode, by means of USB connection and input functionality. Morever, the file configures the dedicated I/Os as inputs, with an internal pull-up enabled, high idle condition and minimal duration of the low logical impulse at 700 ms.

This project comes in  kit . Some components have to be soldered to the included PCB.

http://www.open-electronics.org/tag/ft1125/