16x2 Up and Down button woes

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kou5oku
 
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Joined: Mon Mar 03, 2008 7:42 pm

16x2 Up and Down button woes

Post by kou5oku »

Good Morning!


So I nearly successfully assembled my AWESOME 16x2 lcd Plus Keypad.

When I run the LCDPlate example python script, everything functions except:

- When I click up, up registers on the terminal window, but the LCD turns off.
- When I click down, down registers on the terminal window, but the LCD turns off.
- If I then hit any other button they show up on both the LCD and the Terminal window.

So if the up/down button press is happy (since the terminal window sees it), which pins should I look closer at for sending the up/down signal to the LCD?

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adafruit_support_bill
 
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Re: 16x2 Up and Down button woes

Post by adafruit_support_bill »

Do you have an RGB display (18 pins) or a monochrome display (16 pins).

If you post photos of the front & back of the board, we can check your assembly.

brucifer
 
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Joined: Sun Dec 15, 2013 1:56 am

Re: 16x2 Up and Down button woes

Post by brucifer »

Hello,
I was also having the same issue. It is a monochrome 16x2.
Left and Right and Select buttons work and display on the LCD. Up and Down switch off
the LCD display. I noticed in the guide for the 16x2 mention of some button will switch off
as the colours don't exist. When you run the Adafruit_CharLCDPlate.py it cycles through the colours and I see that only RED, YELLOW and VIOLET show up, So I edited the Adafruit_CharLCDPlate.py file and changed in the test section the Up to lcd.YELLOW and the Down to lcd.RED. Now when I press the UP or DOWN Button it displays in the console and on the LCD properly.

thanks
Bruce

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adafruit_support_bill
 
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Re: 16x2 Up and Down button woes

Post by adafruit_support_bill »

I see that only RED, YELLOW and VIOLET show up
WIth a monochrome display, the backlight is controlled by the RED pin. So, any colors that have a red component (i.e. RED, YELLOW, VIOLET, WHITE) will turn on the RED pin and cause the backlight to turn on.

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