Txt Msg DJ – Software Design By: Kyle Brown Abstract: Everyone wants to dance to their favorite songs at a party, but rarely do guests have much say in song selections and playlists. The Txt Msg DJ aims to make song selection at a party a more democratic process. The Txt Msg DJ is a standalone unit that creates and maintains a party playlist based on song requests sent from party guests via SMS. Guests can send text messages containing song names and the Txt Msg DJ will automatically parse messages, sort requests, and play the most popular. In addition to playing the song audio, the Txt Msg DJ will strobe lights in sync with the beat of the currently playing song. In order to maintain control of the party, users will be able to insert an SD card with predefined whitelisted and blacklisted songs.

Raspberry Pi Software Considerations UART RasPi Communication – Send/receive asynchronous commands and song requests Track Identification – Quickly and accurately determine what the user “meant” to request Track Playback – Retrieve songs from an online service, maintain a queue Station Generation – Retrieve songs similar to recently played songs

Raspberry Pi Software Solutions UART RasPi Communication – Python and modified miniterm Track Identification – Last.fm API track.search Track Playback – MPlayer and Grooveshark, via gsclient plugin Station Generation – Last.fm API track.getSimilar

Microcontroller Software Considerations GSM Module – Send/receive asynchronous SMS messages DMX512/LED – Control lights in real-time with music SD Card – Read config files once, on bootup LCD Screen – Display current track information, as well as queue information

Microcontroller Solutions GSM Module – Interrupt driven (UART from GSM module) DMX512/LED – Interrupt driven using timer SD Card – Run on initialization LCD Screen – Interrupt driven (UART from Raspberry Pi)

SMS Flow

Light Flow

SD Card Flow

LCD Screen Flow