my first post, please be constructive in you criticism :)
lol what happened
I recently received some 2 digit LCD displays in a 1x16 format.
I was able to figure out the pins easily enough with a pair of out of phase 60 hz square waves on 2 GPIO's.
As it turns out, the pin outs match many 2 digit 20 pin displays.
I used the Segment LCD_module to configure the pixel map with 1 seven seg helper(x2).
It was a snap. After playing with the controls I realized these units are likely 3.3 volt ones.
They look GREAT at 3.3 volts with normal settings i.e. B-type wave form - 60hz - 60% contrast
@ 5 Volts they look OK but I had to increase the frame rate to 90hz so I could lower the contrast to 30%
The problem is, it uses 17 I/O's !
Using 2 individual 2digit displays is not even an option. So I thought why not multi-plex 2 of them?
I searched a little while then I just wired it up and tried it.
I tied the respective segments together and brought the common pin for each in separately. for a total of 18 I/O pins used.
Next I reconfigured the Segment LCD module pixel map for a 2x16 matrix, using 1, 7segment helper(x4).
It was that easy.
Experience however tells me that, just because it "works" doesn't mean it will continue working well.
Has anyone else tried this?
are there any pitfalls, problems, or comments ?
thank you for your time
from the great white north.
well that was a disaster
You did a good analysis. Did you concer the Segment LCD component it would have been easier and quicker.