hudiy.eu

re: Waveshare 3S UPS

Things didn't go as planned. The initial design was for a script to monitor the inlet voltage of the UPS using its INI219 chip, and initiate shutdown when that voltage dropped out. The script works fine, but I mistook 'inlet voltage' to mean 'inlet of the UPS' rather than what ...

Updated to 2.12

Set main_configuration.json/ captureAudioOutput = false.

RPi_Native bt controller paired with iPhone (via bluetoothctl).

TPLink bt controller paired with truck (via bluetoothctl).

iPhone wifi connected to AutoKit-5041 (CCPA adapter)

Result = Success! Music is streaming via bt ...

I'm gonna describe a couple things I've learned along the way but haven't seen discussed here. Please correct any mistakes; I'm still learning.

Setup: iPhone bt+wifi --> CCPA adapter/Hudiy tunes bt --> truck amp+sub. RPi5 wifi off, RPi onboard bt <--> iPhone, RPi bt dongle <--> truck.

Blueteeth ...

Details to follow. '35 Chev truck on a '97 S10 4x4 chassis.

Thankyou @gwynethh ; a very useful bit of information. I searched the command and came up with more options:

From https://forums.raspberrypi.com/viewtopic.php?t=359249#p2154772

rpdom@raspberrypi:~ $ vcgencmd pmic_read_adc
3V7_WL_SW_A current(0)=0.00000000A
3V3_SYS_A current(1)=0.07124290A
1V8 ...

Greetings;

Thankyou kind stranger.

This works a charm: while on UPS the system can execute graceful shutdown from anywhere and still fully disconnect from power. Brilliant.

Cheers.

Design criteria:

1.) Parasitic draw when off is not permitted.
> RPi5 must disconnect when off; normal shutdown leaves the computer in 'low-power-mode'.
> HMI screen must disconnect when off; backlight remains on when connected to power.
> UPS must disconnect when off; LiPo batteries are not ...

Time to smoke test.

Greetings from -34C Alberta. With the first deep freeze here I'm finding the hours needed to finish building & installing a head unit in a 1935 custom built truck on a '97 Chevy S10 4x4 chassis; a project started in 2011 and put on the road in 2023. I doubt it will ever be 'done'...

The head unit ...