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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Enough of them were making contact to supply power to the ldc but the ones necessary to receive information from the Arduino were obviously not touching. I will not respond. It’s even worse with a 10k, which is at about It’s unclear to me whether VO or is it V Sorry to second guess you experienced folks but I’m just concerned about potentially shorting something kcd it is working fine as it is unless the way I have it setup now is already shorting something.

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

It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. It shows a datasheet of that display don’t know for sure it is your 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.

It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system.

20×4 Character LCD Display, 20×4 LCD Display, LCD Display – Winstar

Are the pins on the labelled? D1 don’t use what the heck is this for? Johannesburg hams call me: You really need to figure out how the circuit intends to have it wired up, then wire it up that way.


Attached snip from my datasheet which shows the pot. Have a look at “blink 20044a delay”. D2 don’t use what the heck is this for?

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What difference would this make? When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports. Ask questions in the forum. 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 ,cd the pins lose and having them fit through the holes.

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 ld 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. And this intrigues me Did you connect the grounds?

No change when using lcd. I use a 20×4 as follows on my Uno: If it’s supposed to have one side at 5V, then the pot acts as a voltage divider, 2004a into a signal pin.

From your original post: As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. Glad you’ve 2004s it working. JimboZA on Oct 12, Here’s the code I am using: Click it open and then you’ll be prompted by “Library added to your libraries.


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 pcd contrast of the text.

Je kunt hier ook in het Nederlands terecht: Views Read View source View history. Sorry for wasting everyone’s time. Also it restricts other functions of the controller. Retrieved from ” http: D3 don’t use what the heck is this for?

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20×4 Character LCD Display

22004a depends on how it’s designed to be wired. If everything is correct,But the display just shows 16 black rectangles on Line 1. Just in case you missed it: 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. Navigation Main page Random page Recent changes. Its schematic shows the VO on the kcd of a pot between 0v Vss and 5v Vdd.

Yep, unless lxd are purpose made connectors, you always need to solder things together to ensure proper electrical connection. I forgot to make mention of my sketch entries supporting the lcd: Did you check this link form the page you linked to? I think the photo might be deceptive, or wrong.