Qball's Weblog

Setting up a MPD Music Box.

Tags General 

I got my hands on a Juli-C400R board. (Specifications) (foto)

This is a nice little board that can run off a simple  +12 & +5 Volt power supply.   It can run fan-less (later more on that) and should be fast enough to run MPD + a stream output and some other software.

So below a quick description about setting it up as MPD + other stuff server:

Goal of the box

The main purpose of the box is to run MPD, allow me to stream (via ssh forward) music from university.

For the rest I have the following tasks planned:

The hardware

A quick overview of the system:

First thing I did was ditch the power supply it came with, this was a switched 100W  ATX supply making a horrible beeping noise (so this was a no go). Remove the 6000 RPM fan blower.  To make long story short, I removed everything beside the board.

The board can be powered using a normal molex connector, so after digging up an old external CD casing I had a nice fanless, noisless power supply.

edit: This one broke after 2 weeks, so now it is powered for the time being by an atx PSU..  Needs fixing.

So after setting up the Debian on the NFS root and moving /boot and grub to the CF card.

Doing some test shows that the CPU stays a nice 30 degrees, the chipset is another story (it almost feels like an early atom system), this one goes up to 60 degrees.

I added a nice large 12x12cm fan that keeps the chipset a nice 25 degrees. It does however make more noise then the 13 dB they mention (it kinda runs unstable) But doable.

At the moment everything runs fine. Need to add a case later.



Update-grub cannot wrap his head around root being on nfs. So it cannot correctly install the package. So every time I install something, it tries to finish configuring grup-pc and I get a fail, still need to fix this. (Fixed this by modifying the postinst script).


I am not really one to care for casings and stuff like that. So it sits kinda bare next to my stereo at the moment:



Thinking about getting a samsung U70 as a small status monitor. These are to expensive for now. So I might just use a 4×16 character display for the time being.



Light control

The general IO proved to be more tricky then I thought, to read/write to it I needed to send the bios interrupts that would then read/set the value. So this required writing a kernel driver. To much work for the time being.

I solved it by letting a small atmel AVR control a few relays, a display and some other hardware and be controlled by the machine via a serial interface.  (The atmel acts as temperature sensor, 4 channel light control, clock, 64 item timer (programmable time+weekday))

I will add a lot of stuff later.