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Unreliable display with USB serial backpack..
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Unreliable display with USB serial backpack..

by DougMc on Thu Dec 07, 2017 1:16 am

Greetings.
I'm using the Adafruit USB backpack with the Adafruit 20x4 character display.

I've got it configured ok, splash screen set, backlight on properly, running at 9600 baud. All is well, except that if I attempt to write to all 4 rows (before doing another clear operation) I quite often end up with a blank first or last row. I'm driving it with an Arduino Uno using SoftwareSerial. I've experimented at length with extra delays etc, to no avail. I'm not new to this stuff, but I'm struggling with this.
The signal quality looks good on a 'scope, and I've done quite a bit of this stuff.

It works ok about 3/4 of the time, but the failures are frequent enough to be unacceptable. Any thoughts?
cheers
Doug

DougMc
 
Posts: 8
Joined: Wed Oct 04, 2017 11:25 pm

Please be positive and constructive with your questions and comments.