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RPi-Piano 2,1 i2c display
RPi-Piano 2,1 i2c display
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Old 22nd December 2018, 04:14 AM   #1
DRONE7 is offline DRONE7  New Zealand
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Join Date: Aug 2008
Default RPi-Piano 2,1 i2c display

With the Allo Piano 2.1 on a Pi3B the gpio available gives i2c connections for sda and scl.... there is a gnd and 5v too but the i2c backpack is 3.3v for the Pi gpio compatibility.

I have cut the backpack traces so as to feed 5v to the 20x4 lcd and so need 3.3v for the backpack operation.

Can I supply the 3.3v from another supply ? gnds tied together.

Or does the 3.3 need to be Pi derived ?
In which case can I use an Ams1117 to drop the 5v from the allo hat and gnd to give 3.3v for the backpack...?
5pcs DC/DC 4.5V-7V to 3.3V AMS1117-3.3V Power Supply Module Voltage Regulator | eBay
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Old 11th January 2019, 12:11 AM   #2
DRONE7 is offline DRONE7  New Zealand
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Quote:
can I use an Ams1117 to drop the 5v from the allo hat and gnd to give 3.3v for the backpack
To answer myself...yes.

Here is the Pi and Piano 2.1 dac running 3 x i2c screens using an Ams1117 to drop the 5v from the allo hat.

Each screen has it's own unique i2c address and different software for player stats, song info, and spectrum analyser.
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