Re: USB + Serial Backpack Kit with 16x2 RGB backlight negative LCD (item 784) not displaying full ine of text
After attaching the brand new backpack to the lcd, first started up by connecting it to the computer via usb. Then installed the driver (the inf file from downloads) and straight away tried via the arduino's serial monitor: where it generated the issue. Then tried with LCD smartie where it had the same issue.
Finally I disconnected it from the PC and connected it to an arduino via the JST cable provided with the display. Downloaded the sample sketch and it did work as it supposed to. At this point I did not check if the problem is otherwise fixed already so maybe this step already solved the issue.
I suspect the problem might have been at the lcd layout settings. It seemed like it has been set up not as a 16x2 but a 1x unknown display and since the sample sketch has it specified as 16x2 it works since then.
To check this I tested it as connecting the JST cable to the arduino and modified the sample sketch as it changes the LCD settings to 1x16 (see below)
lcd.write(1); // 1 columns (supposed to be 16)
lcd.write(16); // 16 rows (supposed to be 2)
This change generates the exact same issue I had in the first place.
I assume during the testing of the board after manufacturing the factory display settings remained in the board as 1 x whatever.