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DAC2 HD with latching power switch

etannerm

January 17, 2021 23:28

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As the title suggests, I tried employing a latching power switch on my DAC2 HD with script from:

git clone https://github.com/Howchoo/pi-power-button.git

./pi-power-button/script/install

The latching power switch used GPIO pins 2, 4, 6, & 39. I checked that they were not in use by the DAC2.

The power switch now works, but I don't get any sound from the DAC. I just tried a fresh install of HiFiBerry OS on a different memory card and the DAC2 is working just fine.

Can anyone help me understand what I've done wrong? I would guess it is in the script for the power switch. Is it possible to achieve what I set out to do?

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3 comments

• 0
  
  HiFiBerry team January 18, 2021 15:21

  I would not recommend this at all. This kind of configuration creates more problems than it solves and your Pi does not "consume zero power". Have a look here:
  https://www.hifiberry.com/blog/powering-up-down-your-pi-with-a-button/

• 0
  
  etannerm January 18, 2021 18:08

  Thanks for the quick response. Will the upcoming Hifiberry Power Controller be capable of powering the Pi on and off when using Raspberry Pi OS?

• 0
  
  HiFiBerry team January 18, 2021 19:30

  It can be used to power off/on, but it can do a lot more. Controlling it is very simple by just a few I2C registers. Every distribution that have tools like "i2cset" on-board can use it.
  It is also fully programmable. If somebody wants to implement completely different functionalities, that's also quite easy to implement. Our current "firmware" is just 250 lines of code:
  https://github.com/hifiberry/powercontroller/blob/main/powercontrol/powercontrol.ino
  Everybody with some Arduino programming skills can easily change this.