Re: LCD 20x4 I2C

matjaz
 

Change wire and now all ok.
 
73
Matjaz
 

Sent: Tuesday, June 05, 2018 8:59 PM
Subject: Re: [BITX20] LCD 20x4 I2C
 
I have this one
Try all address  0x3F and 0x27 but always equal
 
bye Matjaz
 
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.
    https://groups.io/g/BITX20/message/39966

 
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:

www.ebay.com/itm/Serial-IIC-I2C-Adapter-1602-1604-2002-LCD-Backpack-Arduino-FAST-SHIP-US-SELLER/171036006949?hash=item27d28a5a25:g:vNIAAOSwMmBVnc7K:sc:USPSFirstClass!66609!US!-1

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