MP3 Trigger User Guide v10
Contents
1. respective owners A MP3TRIGGER_UG_090917 X ROHS s S spa fu sparkfun com l kg 6175 LONGBOW DRIVE SUITE 200 303 ELECTRONICS BOULDER COLORADO USA L008 80301 MP3 Trigger User Guide 2009 09 17 Component Layout The layout of the MP3 Trigger can be seen in Figure 2 below 1 Power Select Switch 2 External Power Connector 5 5x2 1mm center positive 3 USB Power and UART Interface for the FTDI Basic DEV 09115 4 USB Power Selection Jumper 5 Trigger Pins 6 1 8 Stereo Audio Output Jack 7 Navigation Switch 8 microSD Socket Figure 2 f ey nt era Ee TTT dts l a HTT TTT e t AY z MP3 Trigger robertsonics F Supplying Power With the Power Select Switch 1 in the EXT position power is applied through the 2 1mm center positive barrel connector 2 and is routed through the on board regulator 4 5V to 12V DC is the allowable input voltage range With the Power Select Switch in the USB position power is applied through the USBVCC pin of the serial port connector 3 As shipped the USB Power selection jumper 4 routes this pin to the on board voltage regulator so the same voltage range as above should be observed If the serial interface supplies 5V DC use this position If the serial interface instead provides regulated 3 3V DC then the jumper 4 may be modified so that the USBVCC pin bypasses the on board regulator and supplies the MP3 Trigger with 3 3V DC directly Refer to2. e corresponding track to play if it exists 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 3 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s S sparkfun sarfun com p U k 6175 LONGBOW DRIVE SUITE 200 303 ELECTRONICS BOULDER COLORADO USA MP3 Trigger User Guide 2009 09 17 Installing a 14 pin dual row header allows shunt jumpers to be installed on the trigger inputs to automatically sequence and loop tracks on power up as follows When a triggered track reaches the end the MP3 Trigger looks to see if any trigger inputs are active and will automatically start another track if so If only the same trigger is active then that track will restart loop If other triggers are active the MP3 Trigger will always start the next higher trigger track wrapping back to TRIG1 after TRIG7 This combined with the fact that the MP3 Trigger will automatically start the lowest numbered active trigger on power up means that by installing shunt jumpers on the TRIG1 TRIG7 inputs the MP3 Trigger can be set to automatically sequence and loop from 1 to 7 tracks on power up with no externally programming or control required Serial Control Protocol The MP3 Trigger comes with a full duplex 3 3 5V ser
3. ial TTL interface that allows for control of all the MP3 tracks up to 256 on the microSD card as well as volume You can use our FTDI Basic DEV 09115 or connect to any serial interface that uses the format 38 4Kbps 8 bits 1 start 1 stop no parity flow control none Note that power can be supplied to the MP3 Trigger by the FTDI Basic by placing the Power Select Switch in the USB Position All commands to the MP3 Trigger are 1 or 2 bytes in length 1 byte commands are upper case ASCII characters 2 byte commands start with an ASCII character Those starting with an upper case character use an ASCII value 0 9 as the second byte These commands can be typed on a keyboard 2 byte commands starting with a lower case character require a binary value 0 255 as the second byte Bytes sent to the MP3 Trigger are not echoed If echoing is required set your terminal program to echo locally Command Summary Command Navigation Start Stop Number of bytes 1 Command byte O Data byte none Comments This command performs the same function as pushing the on board nav switch center position If the current track is playing it stops If the current track is stopped it will restart from the beginning Command Navigation Forward Number of bytes 1 Command byte F Data byte none Comments This command performs the same function as pushing the on board nav switch right position The next MP3 t
4. lem with MP3 Decoder hardware diagnostic 3 short blinks FAT16 microSD media found and at least one MP3 file located As soon as the MP3 Trigger powers up with 3 short blinks it s ready to go The on board navigation switch can be used to play all of the tracks on the card regardless of the filenames Right Plays the next MP3 file in the directory Left Plays the previous MP3 file in the directory Center Starts Stops the current MP3 file Using the Trigger Inputs The MP3 Trigger provides 7 input pins TRIG1 TRIG7 that can be used to trigger specific MP3 tracks on the microSD card Use the following file naming convention to associate a particular track with a trigger TRIG1 filename TRACKO01 MP3 TRIG2 filename TRACKO02 MP3 TRIG7 filename TRACKO07 MP3 These inputs are active low and are pulled high internally Therefore they can be activated either by digital outputs from another microcontroller such as an Arduino or by a simple contact closure switch to ground The inputs support voltage levels of either 5V or 3 3V The trigger inputs are made available on the even numbered pins of a dual row connector and all the opposing odd numbered pins are ground making it easy to wire individual switches or contact closures directly to the MP3 Trigger board Refer to the MP3 Trigger schematic for details The ground pins are those closest to the edge of the PCB Activation of a trigger immediately causes th
5. rack in the directory will be started Command Navigation Reverse Number of bytes 1 Command byte R Data byte none Comments This command performs the same function as pushing the on board nav switch left position The 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 4 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s S sparkf spartan com p U k 6175 LONGBOW DRIVE SUITE 200 303 ELECTRONICS BOULDER COLORADO USA MP3 Trigger User Guide 2009 09 17 previous MP3 track in the directory will be started Command Trigger ASCII Number of bytes 2 Command byte T Data byte N ASCII 1 through 9 Comments If it exists the track with the filename TRACKOON MP3 will be started where N is the data byte Command Trigger binary Number of bytes 2 Command byte t Data byte n 1 to 255 Comments If it exists the track with the filename TRACKNNN MP3 will be started where NNN is the ASCII equivalent of the data byte n Command Play binary Number of bytes 2 Command byte p Data byte n 0 to 255 Comments If it exists the nth track in the directory will be played The total number of available tracks in the director
6. rk of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners A MP3TRIGGER_UG_090917 X ROHS s S
7. spa r sparkfun com ELECTRONICS BOULDER COLORADO USA MP3 Trigger User Guide 2009 09 17 Overview The MP3 Trigger is a versatile low cost low power embedded audio unit that plays MP3 tracks directly from a FAT16 formatted microSD flash card to a stereo line level 1 8 output jack supporting up to 192Kbps stereo playback The board has 7 external input pins that will directly trigger pre selected MP3 tracks and a full duplex serial control port that provides full transport control remote triggering for up to 256 tracks as well as rapid real time volume control There is also an on board navigation switch for local access and playback of all MP3 tracks on the flash card Specifications e Input Voltage Range 4 5V to 12 0V DC or regulated 3 3V jumper selectable e Current Consumption 45mA idle 85mA playing e File system FAT16 e Audio output line level stereo 1 8 stereo jack e Trigger inputs Logic level 3 3V 5 0V active low inputs w internal pull ups Connector provides individual grounds allowing switches or jumpers to be connected directly to each trigger input e Serial Full duplex 8 bit 38 4Kbaud Figure 1 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their
8. the MP3 Trigger schematic diagram for further details 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 2 Trigger WIG 09356 is a trademark of SparkFun Electronics Inc All other trademarks contained herein are the property of their respective owners MP3TRIGGER_UG_090917 X ROHS S spa z sparktun com p u k 6175 LONGBOW DRIVE SUITE 200 303 ELECTRONICS BOULDER COLORADO USA MP3 Trigger User Guide 2009 09 17 Basic Operation Simply transfer desired MP3 files onto a microSD flash card using a PC The MP3 Trigger currently supports SD media formatted with the FAT16 file structure Most microSD cards of 2GB or less are pre formatted with FAT16 Cards larger than 2G and smaller cards formatted with FAT32 will need to be reformatted to work with the MP3 Trigger The MP3 Trigger does not currently support hot swapping of the microSD Card While this will not damage anything the microSD media is only initialized during power up So whenever the card is changed or updated be sure to power cycle the MP3 Trigger after installing the card When power is applied the MP3 Trigger the on board green status LED indicates the state of the installed media as follows 1 long blink No FAT16 microSD media found 1 long blink followed by 1 short blink microSD media found but no MP3 files located Constant short blinks Prob
9. y can be retrieved using Status Request command below Command Set Volume binary Number of bytes 2 Command byte v Data byte n 0 to 255 Comments The VS1053 volume will be set to the value n Per the VS1053 datasheet maximum volume is 0x00 and values much above 0x40 are too low to be audible Command Status Request ASCII Number of bytes 2 Command byte S Data byte N ASCII 0 through 1 Comments If N 0 the MP3 Trigger will respond with a version string If N 1 the MP3 Trigger will respond with the total number of tracks on the installed microSD card in ASCII Both responses will be preceded by the character MP3 Trigger Outgoing Message Summary The MP3 Trigger sends the following ASCII messages X When the currently playing track finishes x When the currently playing track is cancelled by a new command E When a requested track doesn t exist error In response to a Status Request Command data byte 0 the MP3 Trigger sends an 18 byte version string e g MP3 Trigger v1 00 In response to a Status Request Command data byte 1 the MP3 Trigger sends the number of MP3 tracks on the currently installed microSD card e g 14 2009 SparkFun Electronics Inc All Rights Reserved Product features specifications system requirements and availability are subject to change without notice MP3 5 Trigger WIG 09356 is a tradema
Download Pdf Manuals
Related Search