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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Johannesburg hams call me: Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. It’s even worse with a 10k, which is at about If it’s supposed to have one side at 5V, then the pot acts as a voltage divider, probably into a signal pin.

20×4 Character LCD Display

No change when using lcd. Did you check this link form the page you linked to?

Glad you’ve got it working. It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. 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.

It shows a datasheet of that display don’t know for sure it is your display. D1 don’t use what the heck is this for? When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports.


Views Read View source View history. Navigation Main page Random page Recent changes. The default address is: D2 don’t use what the heck is this for? I forgot to make mention of my sketch entries supporting the lcd: 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? Enough of them were making contact to supply power to the backlight but the ones necessary to receive information from the Arduino were obviously not touching.

Do not IM me. From your original post: In depends on how it’s designed to be wired. Je kunt hier ook in het Nederlands terecht: Ask questions in the forum. Are the pins on the labelled?

If everything is correct,But the display just shows 16 black rectangles on Line 1. 20044a this intrigues me It’s unclear to me whether VO or is it V This page was last modified on 5 Augustat Yet I’m still being told to make one of the end connections to 5V. Before upload the code ,you need to select correct Board and Port,please follow the steps: I will not respond.

Did you connect the grounds? What difference would this 2004s

I2C LCD2004

If it’s an input, then grounding it through a pot doesn’t make sense to me. 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. You really need to figure out how the circuit intends to have it wired up, then wire 200a up that way.


If the circuit is just looking at middle pin resistance to ground, then grounding both external pins 204a work, but you’d have a different tapering since effectively, both sides of the pot become resistors in parallel. Privacy policy About Wiki Disclaimers.

Lcs snip from my datasheet which shows the pot. As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. Have a look at “blink without delay”.

Here’s the code I am using: Also it restricts other 2004z of the controller. 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.

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Click it open and then you’ll be prompted by “Library added to your libraries. Sorry for wasting everyone’s time. JimboZA on Oct 12, Navigation menu Personal tools Log in. It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system. Retrieved from ” http: