Arduino 1602 display help - Help Wanted

RE: Arduino 1602 display help

bits2bots — Sun, 19 Jan 2025 15:59:32 +0000

@zander I got it bud. Yes I saw the diatribe so no worries.

RE: Arduino 1602 display help

Ron — Sun, 19 Jan 2025 15:45:53 +0000

@bits2bots I sent you a PM but you don't have 10 posts yet so will not see it. In order to see it, just do trivial replies to this post and yourself until you hit 10. You are only at 1. Just reply to any of my posts letting me know you are at 10 and I will re-send the pm if you haven't already got it.

RE: Arduino 1602 display help

bits2bots — Sat, 18 Jan 2025 04:47:03 +0000

There is a contrast control on the back of the board. As I recall its a small potentiometer so maybe jewelers screwdriver size screwhead. With the unit powered up turn the control until you get the contrast you like.

RE: Arduino 1602 display help

Ron — Wed, 15 Jan 2025 04:48:05 +0000

@davemorris Do you know you have to adjust the pot on the back so that the backlight doesn't wash out any characters?

RE: Arduino 1602 display help

Ron — Wed, 15 Jan 2025 04:32:16 +0000

@davemorris I assume you are using this library

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RE: Arduino 1602 display help

Ron — Wed, 15 Jan 2025 04:31:14 +0000

@davemorris In almost all cases always power the MCU/MPU separate from displays, motors, even sensors unless you know for sure they draw only 10ma.

Did you fix the Hellow World bug? It may also be tripping you up.

p.s. There is a second minor bug, the init method is called twice, only once is needed.

RE: Arduino 1602 display help

DaveMorris — Wed, 15 Jan 2025 04:27:11 +0000

@zander Ron, I figured out how to get it working, but now my only issue is the backlighting on the display is not even, it is a little wavy almost like there is a grounding issue going on, and if I adjust the backlight level so that it is a nice blue background with bright white letters, only the first few characters on the left side are visible. I tried it with two different displays with the same result. I am running it connected to an Arduino nano which is powered by a 6v power supply going into the GND and Vin pins on the nano. Should I power the display straight from the power supply? Or is there something else that would cause the display to not look right?

it’s been a long time since I have worked with the Arduino and the programming is giving me a bit of a headache.

RE: Arduino 1602 display help

Ron — Wed, 15 Jan 2025 03:50:40 +0000

@tfmccarthy Let me wrap this up in a bow Tim. Indeed you were right that the Arduino docs are wrong in this case (and I suspect more) The repository the text is linked to is the wrong author and a different library. The Ver, Author, Maintainer are all correct. Now I see why we thought the other was looking at something wrong. It was Arduino that messed both of us up. Thanks for uncovering that. As long as you Install the library from the Library Manager you will get the correct one. The second screen grab shows the Author the Repository link points to, the real author version number is highlighted in the first pic. I will report the issue to the Arduino support folks.

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RE: Arduino 1602 display help

Ron — Wed, 15 Jan 2025 03:35:03 +0000

@tfmccarthy Oops. I just wanted to make sure nobody following this thread got the wrong info you inadvertently posted.

EDIT: Now I see why you were on the wrong trail, the GOTO REPOSITORY link is WRONG!!!

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RE: Arduino 1602 display help

Ron — Wed, 15 Jan 2025 03:32:37 +0000

@tfmccarthy That has the same info I just posted. The official ver is 1.1.2 and author is Frank Brabander. It looks like we are finally seeing the same thing.