DATASHEET Embedded Audio-Sound Module SOMO-II Document Date: 5th March 2014 Document Revision: 1.0 Uncontrolled Copy when printed or downloaded.
SOMO-II Embedded Audio-Sound Module Contents 1. Description ............................................................................................................................. 3 2. Features ................................................................................................................................. 3 3. Pin Configuration and Summary .............................................................................................. 4 4. Pin Description ..............................
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 1. Description The SOMO-II (SOund Module 2) is a tiny AudioSound module that can play MP3 audio files stored on a micro-SD card (or USB 2.0 Flash drive with extra components), such as voice and music. control functions are all available to the host micro via simple serial commands, along with many more. SERIAL-MODE features a CRC check. The KEY-MODE provides a stand-alone operation where a host micro is not required.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 3.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II triggered input. Connect this pin to a push-button in stand-alone KEY-MODE. 4. Pin Description This section describes in detail the hardware interface pins of the SOMO-II. Micro-controller Interface Pins RX pin 11 (TTL Serial UART Receive): This is the 3.3V TTL Serial UART Receive pin, compatible with 3.3V TTL level Logic, designed to be connected directly with a microcontroller or other TTL capable UART controller.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 5. Operating Modes The SOMO module offers two modes of operation, SERIAL-MODE and KEY-MODE. This section describes both modes in detail. SERIAL MODE The SERIAL-MODE provides a simple 2-wire TTL Serial UART interface to any micro-controller capable of interfacing to a 3.3V or 5.0V (See Section 4.1) TLL Serial UART system that can be configured to output the simple protocol required to communicate with the SOMO-II.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS Function SOMO-II Serial Command Description NEXT If no track is currently playing, issuing the NEXT command will start playing the first track copied to the media (see Section 6). If the 7E 01 00 00 00 FF FF EF SOMO-II is currently playing a song or has previously played a song, this will play the next song in the order copied on to the media.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SINGLE PLAY QUERY VOLUME QUERY EQ SOMO-II This will disable CONTINUOUS, RANDOM TRACK or REPEAT CURRENT modes if previously enabled, which is how the module 7E 19 00 00 01 FF E6 EF starts up by default. This will allow one song to play and then stop. Start track with PLAY.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 7E 3B 00 00 01 FF C4 EF USB Flash Drive Removed. Sent every time a USD Flash drive is unplugged. 7E 3B 00 00 02 FF C3 EF micro-SD Card Removed. Sent every time a micro-SD card is ejected. NOTE: when the card is ejected, multiple messages may be sent (ejected, inserted and ejected again). This is a side-effect of the type of micro-SD socket that is installed if the card is ejected slowly, ie holding in the card before releasing.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II KEY MODE The KEY-MODE provides a stand-alone operation where a host micro is not required. With only 2 push buttons, a 3.7V battery and a speaker, an extremely compact and low component count audio system can be implemented.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II CONTINUOUS MODE 2 220K ohm This will enable Continuous Mode, which will play all the files on the media one after the other and stop when it reaches the last audio track. Pressing PLAY or NEXT once it has stopped, will start the process over. Default is for this mode to be off, which will just play a single track and then stop. Pressing this button again will disable this mode.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II KEY MODE - Example Connection Diagram This is an example schematic showing the simplest connections to the SOMO-II for KEY MODE. Only 2 buttons are required. NEXT/VOL+ will start playing a track if currently stopped, and will raise the volume if the button is held down for > 1.2 seconds. PRE/VOL- will start playing a track if currently stopped also, and will lower the volume if the button is held down for > 1.2 seconds. See the table in Section 5.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 6. Files & Folder Structure The SOMO-II is flexible how files are stored on the micro-SD or USB Flash drive media, however in order to have control over which files are played, it is important to follow some simple naming rules in order for the SOMO-II to play the specific file you intend it to play. The SOMO-II is capable of addressing up to 100 Folders, each with up to 255 songs.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 7. Media – micro-SD and USB Flash 8. Mechanical Dimensions Micro-SD cards The SOMO-II uses off the shelf micro-SD and microSD-HC memory cards with up to 32GB capacity, and compatible with both FAT16 and FA32 file formats. The formatting of the card can be done on any PC/Mac/Linux system with a card reader. Select the appropriate drive and choose the FAT16 or FAT32 file format, depending on the capacity of your micro-SD card.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 10. Optional Connections USB Socket for USB Flash Drive The SOMO-II Module is capable of having an external USB socket wired to it, so a USB Flash drive can be connected for the source of MP3 files. This USB Flash Drive can be selected with either push buttons or with a serial command, and can be swapped back to the microSD card at any time. The following diagram illustrates the simple connections required to wire up a USB Socket.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 11. Specifications and Ratings ABSOLUTE MAXIMUM RATINGS Operating ambient temperature ................................................................................................... -0°C to +70°C Voltage on VCC with respect to GND ................................................................................................ 3.2V to 5.5V NOTE: Stresses above those listed here may cause permanent damage to the device.
SOMO-II Embedded Audio-Sound Module 4D SYSTEMS SOMO-II 12. Legal Notice Proprietary Information The information contained in this document is the property of 4D Systems Pty. Ltd. and may be the subject of patents pending or granted, and must not be copied or disclosed without prior written permission. 4D Systems endeavours to ensure that the information in this document is correct and fairly stated but does not accept liability for any error or omission.
