Hifiberry DAC+ Touchscreen possible?

[Buckler]

Hi,

I own a Raspberry Pi B+ with a Hifiberry DAC+ and its running with Volumio that’s great so far.

But, I would like to add a touchscreen, PiTFT - 320x240 2.8" TFT+Touchscreen http://www.adafruit.com/product/1601
(or similar product from China)

Is this combination DAC+ and PiFTF possible?
Are there Volumisten who have this configuration up and running?

(I couldn’t find a “DIY Project” with this combination…)

THNX

Harry

[Buckler]

I have done some research:

Hifiberry DAC+

https://www.hifiberry.com/guides/gpio-usage-of-the-hifiberry-products/

GPIO 2-3 are used by our products for configuration. If you are experienced with I2C, you might add other slave devices, if you a a novice, we don’t recommend this at all.
GPIOs 18-21 are used for the sound interface. You can’t use them for any other purpose.

PiTFT - Assembled 320x240 2.8" TFT+Touchscreen for Raspberry Pi

http://www.adafruit.com/product/1601

Uses the hardware SPI pins (SCK, MOSI, MISO, CE0, CE1) as well as GPIO #25 and #24. All other GPIO are unused. Since we had a tiny bit of space, there’s 4 spots for optional slim tactile switches wired to four GPIOs (#23, #22, #21/27 and #18 ), that you can use if you want to make a basic user interface. For example, you can use one as a power on/off button. See below for the link to get the optional tact switches, they’re not included.

When you compare these specs the conclusion will be that GPIO #18 cant be used on the PiTFT. This is a spot on the PiTFT for an OPTIONAL switch so that must be no problem.

But what bothers me is the power consumption!!

(Hifiberry)Do not use more than a few mA from the 3.3V line. If your circuit requires 3.3V, use the 5V power rail of the Raspberry Pi with an additional voltage regulator.

(Adafruit) Display current draw is mostly based on the backlight, with full-on backlight the current draw is ~100mA.

The question is which power rail is the PiTFT using and will it affect the DAC?

So when you have this setup please post your experience and confirm this combination is working (or not)?

THNX

Harry

[rpinorway]

I am also very interested in this.
Please keep us updated.

[nomad13]

I’ll wait for some updates too.

[MobeyDuck]

Im not 100% certain of this but the board behind the TFT should be 3 and 5v compatible. Meaning it can use both 3v or 5v for input signals and power.
https://learn.adafruit.com/adafruit-2-dot-8-color-tft-touchscreen-breakout-v2/pinouts

I’ve also found the complete manual of the PiTFT. The complete schematic is in it both for the Pi-1 and Pi-B+/2 versions.
https://learn.adafruit.com/downloads/pdf/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi.pdf

[Videopac]

instructables.com/id/High-En … ntrol-Bas/

[MobeyDuck]

@Videopac

http://www.instructables.com/id/High-End-Sound-with-7-Inch-Touchscreen-Control-Bas/

That is a completely different solution and has nothing to do with the question from the OP.
And PLEASE don’t just post a link always add information.