Display-o-tron not working as expected


#1

Received this morning, and plugged into my PI3, finished the injstallation and it ‘sort’ of works but not as expected. It is acting as if the pins are mis-aligned…

Starting up the backlight only lights the left 3 leds (ass image below). The other backlight leds are only activated as part of the bargraph.py and I can’t display any text.

I have double checked that the Hat is fitted across the pins correctly. Is there anything I can check in software or is it a wiring fault on the Hat?


#2

Which examples are you trying? There are a whole bunch of Display-o-Tron 3000 examples which will not properly work with Display-o-Tron HAT. Judging by your reports, I’d guess you’re running those instead of the HAT ones.


Display-o-tron trouble getting going
#3

In python:

from dot3k import backlight
backlight.rgb(255,255,255)

only lights up the left 3 leds.

from dot3k import lcd
lcd.write(“Hello World”)

does nothing visible.

sudo ./backlight.py in the examples/basic directory works using the left 3 leds only

sudo ./bargraph.py turns on the right 3 backlight leds in turn rather than the side leds.


#4

Ok, hadn’t realised there was a dothat directory as well… must read directory listings better. Using examples from that directory works fine. Thanks.