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Old 1st September 2012, 07:20 AM   #11
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Hey AKHeathen,

The hole in the dash is 85.5 x 32mm (3.37 x 1.25 in.).
The tuning and volume knob holes are 11mm (0.43 in.) diameter, and 123mm (4.85 in.) apart.
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Old 21st September 2012, 02:12 AM   #12
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good thing you steered away from using a relay, that was the worst idea ever. hehe. They make several chips that are all-in-one signal processing, such as bass/volume/treble, some even have EQ. and input switching.. etc... most if not all I2C controlled.

Then from there, you want to drive your audio output IC for running your speakers.

if you have an IC thats 4-input you can do your radio on 1, aux on 2, MP3 on 3, CD on 4. (driving some CD-Mechs from junk headunits isnt hard). So if you have old CD-Mechs lying around most are connected via small ribbon cable. You can usually get a datasheet on the CPU thats on the CD mech and you can send data to it to control it, change tracks, read CD_TEXT, etc... Also you must build some linear volt regulators to drive the CD mech. Most are 5V, and 9V.

gotta watch out though as some CD mechanism assemblies are "dumb". They contain only servo control systems and require all the brains to be done on the mainboard, such as decoding the TOC, stepping the servo, even handling the I2S data for the DAC to get Audio coming from the mechanism, heck with that.

the newer CD mechanisms from old junk Dual units, etc.. are MCU based. The DAC, Servo, CD control processor, etc.. are all on-board the mechanism assembly. All the mainboard does is supply it Servo power, Logic power, and provide a (mostly 8-bit parallel, newer is serial) datastream to control it.

What data to be sent to the mechanism to control it, varies greatly depending on the MCU used on the mechanism which you can find datasheets for most of the time. The packets contain CD return/TOC/Timing data. Track info, etc.. Packets from the mainboard back to the mech, tell it to eject, take in, check sensors, and step track forward/backwards/stop/play. etc.. thats it. Almost like your typical computer CDROM if driven from an external micro for it to act as a CD player.

Last edited by mbates14; 21st September 2012 at 02:20 AM.
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Old 21st September 2012, 02:44 AM   #13
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Hey, thanks for the info

I doubt I'll add CDs to the stereo, but I'll be following your advice if I do decide to steer things that way.

Now that I've got most of the electronics finished, my focus is going to be on creating a tasteful looking face for it.
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Old 28th September 2012, 03:45 AM   #14
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another thing you could do which is even easier is a slot-load based IDE laptop drive, and using already public arduino IDE/ATAPI CD player code. its out there, i seen it the other day.
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Old 28th September 2012, 04:39 AM   #15
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I won't have the width needed in my stereo face for a CD slot, but that's a genius idea!

This is a photoshop mock-up for what I'm planning...

Click the image to open in full size.

...we'll see if I can make it look like that in real life.

I've already got the knobs, rectangular LEDs, and iPhone 4 power buttons for source/mute/display/set. The display, Seek and Preset buttons are on digikey.com

I just need to find somewhere that will laser-cut and etch some brushed stainless steel for me.
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Old 29th September 2012, 12:04 AM   #16
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i like that. And with a DIY arduino powered CNC machine, that outcome is entirely possible BTW.
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Old 6th March 2013, 10:55 AM   #17
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Cool project, I'm aiming to build somthing similar!

Do you still have the code and schematics? Would you share it?

Did you ever finish it?

Sorry fot bringing this old thread up again!
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Old 19th March 2013, 03:08 AM   #18
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Hey Extreeem,

The breadboard is still sitting on my desk - lying stagnant while I try to finish the car it's going into

I've PM'd you some links to the files.

Andrew
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Old 19th March 2013, 11:11 PM   #19
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I've had a couple of people ask for my code, especially the stuff relating to the PT2314.

So in the interest of open source, here we go
The file: ElectronicTuner.zip is my Arduino project.


Feel free to do whatever you like with this code, just give me credit in the comments if you use a big chunk of it. If you do anything cool, let me know!


Andrew
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Old 20th March 2013, 06:23 AM   #20
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Very nice, I'm sure that there's more people than me that appreciate you sharing the code with us!
Open source is great!

Do you remember what kind of rotary encoders you choose for your design? And where did you get the nice looking knobs?

I hope you find the time to finish your project! Good luck!
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