4×4 Matrix Keypad Module In Pakistan

The WTV020SD is a small, simple IC for embedding audio playback into your next project. These devices are commonly used in children’s toys and talking retail displays. This breakout board allows you to access the functionality of the WTV020SD to give a voice to your next project. The breakout board includes a battery connector and a micro-SD card slot. Simply load your audio files onto a micro-SD card and plug it in, power up the module, and trigger the playback. Playback can be triggered in either key or serial mode: The key-mode provides a stand-alone operation where a host micro is not required. With only 3 push buttons, a 3V battery, and a speaker, an extremely compact and low component count MP3-Player-like system can be implemented. The serial mode provides a simple, 2-wire interface to any micro-controller via its DATA and CLK lines. Audio operations such as PLAY, PAUSE, STOP, and VOLUME control functions are all available to the host micro via simple serial commands. The audio compression used in this module is a little strange (4-bit ADPCM @ 6-32kHz) so you’ll need to download the utility in the documents below in order to convert yours. WAV files into the 4-bit ADPCM format required.