This will probably get the "dumb question of the day" award, but I cannot get much of a response from the Lumex LCR-U01602DSF/DWH 16×2 Backlit LCD Display I bought recently.
I needed a large, bright LCD that can be seen from a bit of distance. For this reason I bought the aforementioned LCD here: http://www.newark.com/lumex/lcr-u01602dsf-dwh/alphanumeric-display-32-9-66mm/dp/65R6890?Ntt=65r6890
The datasheet can be found here: http://www.lumex.com/specs/LCR-U01602DSF+D-WH.pdf
I found out about this LCD after watching this tutorial: http://www.jeremyblum.com/2011/07/31/tutorial-13-for-arduino-liquid-crystal-displays/
Jeremy, the guy who made that tutorial, also wrote a review for it here: http://www.jeremyblum.com/2011/07/15/product-road-test-lumex-backlit-16x2-lcd-display/
I thought that this LCD should work like any other, except for the extra two pins it has at the end (17 and 18) which are used for the "heater." Also, although the logic is 5V, the LCD backlight requires around a 6V input. I got this 6V by dividing the voltage with two 222 ohm resistors from a 12V wall regulated wall wart from Adafruit (see the picture I linked to below).
Based on all of this information, I thought that it should be fairly simple to get working. However, I have the following problems/observations:
Backlight: this turns on when I apply the 6V, although it is not as bright as the pictures/videos made me expect.
Contrast adjustment w/ 10K trimmer pot: This seems to do absolutely nothing. No matter how much I twist it nothing changes.
General display: After wiring it according to this tutorial: http://arduino.cc/en/Tutorial/LiquidCrystal, I tried to some run some of the example LCD sketches in the Arduino library. In general, nothing happens. Occasionally I see bars that move around in an incoherent fashion on the screen, but this only lasts for a few seconds. These bars were sharp and well-defined, with good contrast at the setting that the pot was at.
I uploaded a picture of my current setup here: [url=http://www.flickr.com/photos/dwhittenphoto/7737781274/in/photostream[/url] The code I have been trying to use is identical to the code in this tutorial: http://arduino.cc/en/Tutorial/LiquidCrystal
I am no soldering expert, but I double checked my solder joints and they seem pretty ok to me.
So my main questions are: 1) Why does the contrast adjustment not do anything? 2) Am I wiring this LCD incorrectly? Is the pin arrangement different then the pin arrangement in the Arduino tutorial?
When I ask questions I usually try to be more specific, but I am kind of at a loss here. I really appreciate any assistance!
Thank you for your time.