I’m trying to get my A LCD to work with my Arduino Uno and display a simple message but whenever it’s turned on, it boots up showing the. The I2C 20×4() LCD display module is an Arduino compatible display which uses high speed I2C serial bus. The LCD display is a 20×4 white character. Standard blue backlight LCD for your Arduino projects, it supports 16 characters wide and 2 rows in white text on blue background was specially developed for.

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It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers.

20×4 Character LCD Display

If the circuit is just looking at middle pin resistance to ground, then grounding both external pins would work, but you’d have a different tapering since effectively, both sides of the pot become resistors in parallel. Here’s the code I am using: No change when using lcd. And this intrigues me I use a 20×4 as follows on my Uno: So I finally got it working, turns out it is necessary to solder connections from the pins to the copper either on the back or front surfaces – there is almost no contact made just by keeping the pins lose and having them fit through the holes.

Sorry for wasting everyone’s time. It’s unclear to me whether VO or is it V You really need to figure out how the circuit intends to have it wired up, then wire it up that way. I will not respond. Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. D3 don’t use what the heck is this for? The default address is: Did you check this link form the page you linked to? Views Read View source View history.


If everything is correct,But the display just shows 16 black rectangles on Line 1. Enough of them were making contact to supply power to the backlight but the ones necessary to receive lcv from the Arduino were obviously not touching.

LCD 20×4 Blue Backlight Parallel Interface Display Module 2004A

Did you connect the grounds? Just in case you missed it: Ask questions in the forum.

Click it open and then you’ll be prompted by “Library added to your libraries. When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports. As for the potmeter connection, I’m still running the end wires to the ground and ldc middle wire to pin 3 of the LCD and it works fine in adjusting the contrast of the text. Navigation menu Personal tools Log in. I think the photo might be deceptive, or wrong.

It’s even worse with a 10k, lc is at lcdd What difference would this make? From your original post: Before upload the code ,you need to select correct Board and Port,please follow the steps: Also it restricts other functions of the controller.

It shows a datasheet of that display don’t know for sure it is your display. Privacy policy About Wiki Disclaimers. Do not IM me. Are the pins on the labelled?

Sorry to second guess you experienced folks but I’m just concerned about potentially shorting something since it is working fine as it is unless the way I have it setup now is already shorting lc. It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system.


Johannesburg hams call me: Yet I’m still being told to make one of the end connections to 5V.

A LCD works but doesn’t display what I programmed

In depends on how it’s designed to be wired. D2 don’t use what the heck is this for? As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness.

I’m trying to get my A LCD to work with my Arduino Uno and display a simple message but whenever it’s turned on, it boots up showing the first and third rows filled entirely with blocks for a couple of seconds, and then it disappears backlight still on of course so it can’t be a contrast issue. If it’s supposed to have one side at 5V, then the pot acts as a voltage divider, probably into a signal pin.

Its schematic shows the VO on the wiper of a pot between 0v Vss and 5v Vdd. Attached snip from my datasheet which shows the pot. This page was last modified on 5 Augustat I forgot to make mention of my sketch entries supporting the lcd: Navigation Main page Random page Recent changes.

Have a look at “blink without delay”. JimboZA on Oct 12, Glad you’ve got it working.

D1 don’t use what the heck is this for? Je kunt hier ook in het Nederlands terecht: Retrieved from ” http: If it’s an input, then grounding it through a pot doesn’t make sense to me.