Use of-the-shelf PC computer parts
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+ Inexpensive
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+ Easy to install and develop software
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- Big
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- High power consumption
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- Complex power supply (switching with a lot of output voltages +5, +12, -5,
-12)
The PC will need the following:
Power Supply
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Isolated from car electrical system to avoid ground loops
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Swith Mode Power Supply to minimise heat dissipation >70% effiencency
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Low voltage shutdown with hysterizes (7V off, 9V on)
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50mV ripple max?
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+5 @ 4-5A
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+12 @2-3A
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-12 @ 200-500mA
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-5 @ 500mA
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+5 @ 100mA (ATX standby supply)
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Operation temperature –5 – +60 Celcius
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Externalisolated On-Off control
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Current Limited
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Output Excess switch off
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Overheat switchoff
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Computer supervisor connector for temperature, voltage and fan status
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External temprature sensor and fan control
CD Changer Interface
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Connect to either parallell port, serial port or keyboard or multiple
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Isolated interface using optocouplers or similar
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Fit Volvo S60 HUx03, 850 GLT
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Iginition On/Off input
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Car Audio System In/Off input
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Transformer isolated sound output from computer
Computer
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Keyboard input
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Serial port
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Parallel Port
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100 MBit Ethernet TP5 with standby wakeup
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Pentium 90-120MHz (not higher because the requirement of a fan...)
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16-32 MB memory
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4-10GB harddrive (2”5 drive because more robust?)
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ATX? Power supply connector to allow OS to go to standby when ignition off?
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Good (High) quility sound card
Software
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Linux minimal installation
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SAMBA for mp3 download/upload
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WEB server for demo purposes
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MP3 player like command driver WinAMP or similar
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WinAMP command driver from CD changer interface and power manegement interface
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Linux OS extension for power management to goto standby
Case
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Nice small case with TBD logo
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Easy unpluggable with two connectors: CD changer cable and power supply