The MP3-445 is a highly versatile, highly configurable MP3 player and automation interface with an onboard audio amplifier and extensive electrical input and output options. It can be everything from a doorbell, to the control center for a complex public multimedia display. It operates independently or using the built in serial interface, it can control other devices or be controlled by other devices, including computers.
Features
- Solid-state Compact Flash MP3 Player supporting MPEG2 Layer 3 Stereo decoding at all MPEG sampling frequencies and bit rates up to 256 kb/s including variable bit rate (VBR).
- Operates in two stand alone modes (simple & enhanced), and a peripheral mode (interfaced to a remote computer or other device).
- Line-level unbalanced/balanced-isolated stereo outputs.
- On-board power amplifier capable of 2 x 25W stereo outputs with output AC/DC short-circuit protection.
- 16 switch inputs with transient protection.
- 2 opto-isolated inputs.
- 16 outputs with 250mA continuous or 1.5A pulsed current per output.
- Supports Compact Flash Cards type I and II with capacities up to 4GB.
- Standard serial interface (RS-232) running at 9600 baud.
- DIP Switch selectable level/edge triggered inputs and audio level adjustments.
Specifications
General
| Input power | 9VAC-12VAC @1A or 12VDC-16VDC @ 1A |
| Current consumption | 130mA typical during MP3 playback (without power amplifier), 80mA when idle |
| Storage medium | FAT16 formatted Compact Flash (CF) Cards Type I and II |
| Storage capacity | 4GB |
I/O
| Switch inputs | Active low with transient protection. DIP Switch selectable triggering |
| Opto-isolator inputs | 3V to 12V DC |
| Outputs | 250mA continuous and 1.5A pulsed current per output |
Audio
| Decoder | STA013 single chip MPEG2 Layer 3 decoder supporting STEREO and MONO channels and all MPEG 1 & 2 sampling frequencies and bit rates Up to 256 kb/s including variable bit rate (VBR) |
| Frequency response | 20Hz to 20 kHz |
| Distortion | THD < 0.3% 2x10W/4ohm @ 14.4V, 1 kHz THD < 10% 2x25W/4ohm @ 14.4V, 1kHz |
Mechanical
| Dimensions | 203mm (L) x 137mm (W). CF card exceeds longer edge by 12mm |
| Weight | 0.27 kg |
| Mounting | 4 holes dia 3.35mm spaced 190mm horizontally and 123mm vertically |
Operating conditions
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -20°C to 70°C |
| Humidity | 5% to 80% RH non-condensing |
Functions
Simple Stand-alone Mode
| Inputs | 14 edge-triggered or 7 level-triggered, non-triggerable switch inputs. Opto-isolated inputs 1 and 2 mapped to switch inputs IN09 and IN10. Either rising or falling edge transitions recognised based on DIP switch settings. See DIP Switch Settings. |
| Outputs | 14 high-current outputs. One-to-one correspondence between outputs and inputs. |
| Playback | 14 MP3 tracks. See MP3 Track Numbering. One-to-one correspondence between MP3 tracks and inputs. |
| Volume adjustment | Switch inputs IN15 and IN16. Volume adjustment is done in real time and final value is written to EEPROM after track ends. |
Enhanced Stand-alone & Peripheral mode
| I/O | 16 unique inputs and outputs |
| Playback | 255 MP3 tracks. See MP3 Track Numbering. |
| Serial I/F | 4-pin header; 0-5V TTL levels; 9600 baud |
| Commands | Read inputs, change outputs, play/stop track, send configuration file/entry, change volume. See Peripheral Mode Commands & Responses |
| Configuration File | 255 rules supporting 16 Input Edges/Levels, 16 Outputs, 16 Timers, 16 Variables, multiple IF-THEN constructs. See MP3 Configuration File |
| Volume adjustment | Software controlled. 256 levels in steps of 1.5dB |
Click here for Application Notes.
Click here for Wiring Information.
Accessories
MP3 CONTROLLER Board MPC-494
The MPC-494 is a small 50mm x 18mm board which piggybacks on to the serial port of the MP3-445 Compact Flash MP3 board. It controls I/O and MP3 playback based on rules in the user changeable configuration file stored in the Compact Flash.
QUAD OPTO-ISOLATOR Board OPT-466
The OPT-466 Opto-isolator board connects to any 4 of the 16 inputs of the MP3-445 to convert them into 4 opto-isolated inputs.
Click here for detailed specs on the OPT-466
DUAL QUAD RELAY Board RLY-312
RLY-312 Relay Board connects to 4 of the 16 outputs of the MP3-445 to convert them into 4 DPDT relay outputs, each capable of switching loads of 60W/125VA.
Click here for detailed specs on the RLY-312.