Re: LCD 20x4 I2C


Sent: Tuesday, June 05, 2018 7:42 PM
Subject: Re: [BITX20] LCD 20x4 I2C

I would remove the 5v pullups from the LCD backpack, the Raduino still has 3.3v pullups on those lines.
A 3.3v high into the PCF8574T chip on the LCD backpack board seems to work fine.

On Tue, Jun 5, 2018 at 10:07 am, Tim Gorman wrote:
You can't just connect D4 and D5 to the SDA/SCL leads.

You need an I2C adapter added to the back of the lcd.

this is an example:!66609!US!-1

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