11-05-2019, 08:51 PM
Wasn't sure if this is yet worth posting, but I thought maybe it will encourage me to finish this project at last.
I've started this over a year ago, and ever since it's been mostly sitting in a box due to lack of time. But the idea is to make it as OEM-looking as possible with a remote control in the center console reminiscent of what could've been an even earlier I-drive.
I've used the cheaper alternative 7" LCD from the usual suspect sites. The challenge with it was mainly making it fit and affix to the 2DIN frame. For that I 3D printed some clips to hold the screen and pieces to hide the gaps. It seems to hold the LCD plenty sturdy.
Some options for the remote control that I've explored:
I was in a bit of a dilemma of where to exactly put the controls, but I think I will go with the center cubby hole.
And the whole (ATM) rats nest:
PWM LCD backlight control hack: (link to small tutorial for those interested)
Components I've used so far:
The sealed buck converter I scrapped for being fixed at 5V, which due to wire, trace resistance would drop way too low at some points and the low voltage would cause all sorts of problems like some hub ports not working, screen flickering etc. The current one I set at around 5.25V at the source, which makes the voltage in the downstream devices not drop below 5V for the most part. The setup is much happier like this.
Goals and plans:
I've started this over a year ago, and ever since it's been mostly sitting in a box due to lack of time. But the idea is to make it as OEM-looking as possible with a remote control in the center console reminiscent of what could've been an even earlier I-drive.
I've used the cheaper alternative 7" LCD from the usual suspect sites. The challenge with it was mainly making it fit and affix to the 2DIN frame. For that I 3D printed some clips to hold the screen and pieces to hide the gaps. It seems to hold the LCD plenty sturdy.
Some options for the remote control that I've explored:
I was in a bit of a dilemma of where to exactly put the controls, but I think I will go with the center cubby hole.
And the whole (ATM) rats nest:
PWM LCD backlight control hack: (link to small tutorial for those interested)
Components I've used so far:
- Sealed 3A buck converter.
- Adjustable 3A buck converter
- RPi 3B
- 1024x600 Aliexpress LCD
- Cheapo USB hub. USB lead power cut and separate power fed
- HiFi-berry DAC clone
- Generic USB soundcard for mic in
- Ground loop isolator
- Arduino thing for USB keyboard emulation
- Boost converter to 24V for audio amp (may use it, may not)
- TPA3116 stereo amp. The onboard op-amp removed for being nonsensical source of noise
The sealed buck converter I scrapped for being fixed at 5V, which due to wire, trace resistance would drop way too low at some points and the low voltage would cause all sorts of problems like some hub ports not working, screen flickering etc. The current one I set at around 5.25V at the source, which makes the voltage in the downstream devices not drop below 5V for the most part. The setup is much happier like this.
Goals and plans:
- I-bus integration for SWC and maybe some on-screen information like speed, consumption, etc.
- External DSP for audio and subwoofer control. Something like a BD37034 chip and the DAC chip on one board as a shield for the RPi with RCA outs. But this is going to need more time, if I ever get to it even.
- Power management for shutdown delay and proper shutdown.