2009 Tacoma Build

[a8ksh4]

Alright, it's finally in the car and working! Need to look into a couple things:
* Volume level really low, don't want to turn up amp gain until I know I need to...
* De-bouncing the acc line when I need to start the engine but the hu is already on in standby when the screen off.
* Steering wheel buttons. I expected to see the ASWC-1 show up as a serial device or something that I could get button actions from...

PXL_20251210_184138836.jpg (3 MiB) Viewed 226 times

[a8ksh4]

I figured out a couple of things today.

The apple headphone DAC was indeed defaulted to a low output level. I was able to pactl get and set it out below. This value stick through a reboot, so I guess doesn't need to go into a startup script or anything.

Code: Select all

dan@taco: $ pactl get-sink-volume alsa_output.usb-Apple_Inc._USB-C_to_3.5mm_Headphone_Jack_Adapter_DWH52430BA92FN3AJ-00.analog-stereo

Volume: front-left: 26214/40%/-23.88 dB, front-right: 26214 / 40 -23.88 dB
balance 0.00

dan@taco: $ pactl set-sink-volume alsa_output.usb-Apple_Inc._USB-C_to_3.5mm_Headphone_Jack_Adapter_DWH52430BA92FN3AJ-00.analog-stereo 100%

dan@taco: $ pactl get-sink-volume alsa_output.usb-Apple_Inc._USB-C_to_ 3.5mm_Headphone_Jack_Adapter_DWH52430BA92FN3AJ-00.analog-stereo
Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00

Second, the pi is rebooting if I start the engine. The pi is powered straight from the car battery with the switched acc line to gpio. I'm guessing that the buck converter doesn't respond quickly enough to the massive drop in voltage when the starter motor does its thing. Maybe I can put a big cap on the 5v side to buy it a little more time?

[hudiy]

Indeed, 40% is the default level in PipeWire for new devices. After changing the volume level, WirePlumber is responsible to restore it after reboot.

Regarding the voltage drop issue, we can recommend this power module https://www.dfrobot.com/product-752.html . It has wide range of input voltage and provides solid output voltage (crucial for Raspberry Pi). We use it with our Pi5-based setups.

[a8ksh4]

Thanks for the power module recommendation. I'll get one on order!