Arduino Car Stereo
This whole thing started because I wanted MP3's in my RA28 Celica, but didn't want to ruin the interior by adding a modern 1-DIN sterero.
After going to great lengths to replace the previously molested dash, there's no way I was going to cut into my original center console.
Now, there's already a few oldschool looking stereos on the market (like the RetroSound), but they don't make any that fit the old Toyota hole size.
Obviously I could have hidden something in the glovebox, but I wanted to be able to reach the controls. There's plenty of other ways I could have achieved my goal, but as a bit of a geek, I couldn't help myself. I had to try building one using an Arduino.
The beauty of doing this with an Arduino is I can always change it later. It's like Lego. But as tempting as it is to keep adding features, at some point I have to actually make the thing.
So for now, I've settled on the following:
- FM Tuner
- USB (MP3/WMA)
- 12-character alphanumeric display
- Bass / Treble / Balance
- Display brightness
Spectrum Analyzer with 5x display modes
(lines, bars, peaks, pulse, bars+info)
The unit itself has no amplifier. It outputs at line level. I've got it connected to an Alpine KTP-445U 4-channel amp.
The choice in display was a hard one. Those little Avago HCMS-29xx displays are expensive! But for the 80s look, I absolutely had to do it with LEDs.
I don't regret a thing.
A tribute to the 1980s Toyota AM/FM/MPX Electronic Tuner
You may have noticed the similarity between my face design, and the radio in Toyota's MA47 Supra (part number 86120-14350). This is not a coincidence.
Just look at all those glorious LEDs, buttons, switches, and that metal finish!
[+] Click to enlarge
The second-last photo was taken from the 1982 Toyota Truck Brochure on toyotareference.com
That last photo was taken from celicasupra.com
So, what's it made of?
Well, my project uses:
- Arduino Mega 2560
- Custom Printed Circuit Boards by OSH park
- Si4703 FM Tuner breakout board
- VMusic3 USB/MP3 module
- PT2314 Audio Processor IC (4x inputs, bass, treble, balance, and volume control)
- DS1307 Realtime clock
- 3x HCMS-2904 LED displays for a total of 12 alphanumeric characters
(the photos don't do them justice - they're much brighter in real life)
- MSGEQ7 Spectrum Analyzer
- A whole bunch of wires, buttons, lights, and knobs :)
- A broken shaft-style radio from a '79 Supra as the case
- Aluminium front panel milled, engraved, and in-filled by frontpanelexpress.com
- Switch-mode DC/DC Converter (TRSN 1-2490) to supply 9V through the barrel-jack instead of the 12-14V a car generates. This stops the Arduino's on-board 5V voltage regulator from overheating and resetting.
Still yet to do:
- Have the display screen remade in a tinted acrylic (rather than the clear it is now).
- Maybe repaint the buttons in a harder wearing paint, or even 3D print them in stainless steel!
I mainly created this page to share my VMusic3 Arduino library, but in the spirit of open-source, here's everything!
I've moved the libraries and Arduino sketch files to gitlab.com
The entire project (excluding the arduino libraries below)
VMusic3 Arduino Library
My VMusic3 Arduino library (may also work with VMusic2, but not yet tested).
HCMS-29xx Arduino Library
An Arduino library for the HCMS-29xx LED Displays (slightly modified to allow multiples of 4 characters, and direct access to the Dot Register).
Si4703 Arduino Library
A modified version of the Si4703 FM Radio Arduino library (to allow showing frequencies while seeking).
|8th September, 2021
|Moved repositories to gitlab.com