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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Glad you’ve got it working.

It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. It’s unclear to me whether VO or is it V Attached snip from my datasheet which shows the pot.

It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system. I forgot to make mention of my sketch entries supporting the lcd: And this intrigues me 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.

JimboZA on Oct 12, Views Read View source View history.


I2C LCD2004

You really need to figure out how the circuit intends to have it wired up, then wire it up that way. Also it restricts other functions of the controller. When they are connected to 2004aa controller, multiple IOs will be occupied of the controller which has no so many outer ports.

If it’s an input, then grounding it through a pot doesn’t make sense to me. Yet I’m still being told to make one of the end connections to 5V. As for the potmeter connection, I’m still running the end wires to the ground and the middle wire to pin 3 of the LCD and it works fine in adjusting the contrast of the text.

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 something.

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.

Sorry for wasting everyone’s time.

A LCD works but doesn’t display what I programmed

Je kunt hier ook lcf het Nederlands terecht: In depends on how it’s designed to be wired. Do not IM me. As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness.

Its schematic shows the VO on the wiper of a pot between 0v Vss and 5v Vdd. D3 don’t use what the heck is this for? D1 don’t use what the heck is this for?


I’m trying to get my A LCD to 2004w 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. Click it open and then you’ll be prompted by “Library added to your libraries. If everything is correct,But the display just shows 16 black rectangles on Line 1.

Navigation menu Personal tools Log in. I use a 20×4 as follows on my Uno: The default address is: Are the pins on the labelled? It shows a datasheet of that display don’t know for sure it is your display.

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

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Did you connect the grounds? Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. This page was last modified on 5 Augustat