Just received the Phat DAC and want to combine it with outher stuff on a Pi, Pi0 and Pi2 etc so need to know which pins are in use? Anyone?

GPIO18 is the clock and is used!

Jon, not sure your input has been very helpful. Got the unit working then started running various other elements inc reading a DHT22 signal on GPIO21 - caused the DAC to crash! So although I’m not even close to being an expert, but it seems to use GPIO21 (Pin 40) too!

yes! i2s is GPIO18-19-20-21, of which all but GPIO20 are used by the pHAT DAC. I hope this helps… check out pinout.xyz for details, there will be a pinout for this hardware up there soon, but in the meantime you can click on the various pins and see what their purpose(s) are!

on a sidetone physical pins 27 and 28 are not in use, a pHAT is not a HAT ;-) Edit: I think I see where the confusion lies, you took it as the pHAT using i2c when @jon said i2s?

Here’s one of my minimalist soldering job that should illustrate what pins the pHAT DAC uses (the block at right is not necessary in full only 3 out of 6 pins are): https://instagram.com/p/_dC6kvpkA0/

So, for anyone still not sure, we just need 7 out of the 40 pins. (right?) Pin 1 (3.3V) Pin 2 (5V) Pin 12 (GPIO 18) Pin 35 (GPIO 19) Pin 38 (GPIO 20) Pin 39 (Ground) Pin 40 (GPIO 21)

Correct, though you don’t need GPIO 20 (physical 38), technically.

Thanks @RogueM . So, we need 6 out of the 40 pins. Pin 1 (3.3V) Pin 2 (5V) Pin 12 (GPIO 18) Pin 35 (GPIO 19) Pin 39 (Ground) Pin 40 (GPIO 21)

What does need mean here? That GPIO 20 (physical 38) is free to use for other stuff?

PHAT DAC Which GPIO are in use

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mettauk December 19, 2015, 1:23am 9

Thanks RogueM

That’s very helpful for now, I will come back if I trip up!

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PHAT DAC Which GPIO are in use

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