I picked up a LCD - JHD162A - 16 pins however i'm unable to get it to work. I've tried both libraries - the standard one as well as the lcd4bit one. I'm able to download the program but the display doesnt change. It looks the same like it does when the lcd powers up. Now how do i troubleshoot this?…

Now i've tried using all 8 pins(DB0-DB7) still it doesnt work. How do i check this?

Can you show us how you have it wired and what code you are using to test it. Also a better description of what does and does not work would help. Don't forget to adjust the contrast.

Have you wired the contrast pot up and adjusted it? If not you probably cant see anything at all.

Thanks a ton guys. No, I haven't wired contrast up. I have 2 pins for contrast led+ an a led- now i coudn't find any instructions on how to wire it up for 2 pins. Also i presumed that since i was able to see black boxes in the display that the contrast was ok. please let me know how to wire this up…

Now i figured out the other 2 pins and connected... Voila it works but then prints wrong characters! lol... "Hello" is printed as "Jgnno" here is more for reference lcd.print("Hello"); //Jgnno lcd.print("World"); //Wornf // lcd.print("ABCDEFGHIJKLMNOP"); //CBCFGFGJKNONOR Should i do some cha…

I think your DB5 (DB1?) line is not wired securely/properly. To print on the second line, I use: lcd.setCursor(0, 1); // Column 0, row 1 (LiquidCrystal Library) Mikal

Hi Dummy, Using an ASCII table is a great way to debug LCD 8-bit data communication. ASCII Table - ASCII Character Codes, HTML, Octal, Hex, Decimal Ascii character table - What is ascii - Complete tables including hex, octal, html, decimal conversions …

Quite right, Mike. I noticed that in every case the unexpected character differed from the correct value by +2, leading me to suspect that the next-to-low-order bit was faulty. I guessed it was probably DB1 (or DB5 in the 4-wire case), but was too lazy to verify by reading the docs. So I just threw…

If you wire it back the way it was then you have a (simple and not too secure) code engine :stuck_out_tongue:

LCD Troubles...

Forum 2005-2010 (read only) General Frequently-Asked Questions

system December 7, 2008, 4:48pm 8

ok i rewired the whole stuff and it works! Yay! but can you explain how you figured out it was DB5(DB1)? what are these for? just curious... :

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