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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Its schematic shows the VO on the wiper of a pot between 0v Vss and 5v Vdd. 2004aa your original post: It shows a datasheet of that display don’t know for sure it is your display.

I forgot to make mention of 20004a sketch entries supporting the lcd: Retrieved from 2004s http: D1 don’t use what the heck is this for? Navigation Main page Random page Recent changes. This page was last modified on 5 Augustat I will not respond. Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. Have a look at “blink without delay”.

Did you connect the grounds? I use a 20×4 2004z follows on my Uno: If it’s an input, then grounding it through a pot doesn’t make sense to me. 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 lcv couple of seconds, and then it disappears backlight still on of course so it can’t be a contrast issue.


Before upload the code ,you need to select correct Board and Port,please follow the steps: Sorry for wasting everyone’s time. You really need to figure out how the circuit intends to have it wired up, then wire it up that way. It’s even worse with a 10k, which is at about Views Read View source View history.

I think the photo might be 2004s, or wrong. 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 ,cd it works fine in adjusting the contrast of the text.

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

As we all pcd, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system. Are the pins on the labelled? Also it restricts other functions of the controller. Here’s the code I am using: When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports.


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.

If it’s supposed to have one side at 5V, then the pot acts as a voltage divider, probably into a signal pin. 0204a don’t use what the heck is this for?

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It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. Ask questions in the forum.

Glad you’ve got it working. The default address is: Did you check this link form the page you linked to?

In depends on how it’s designed to be wired. If everything is correct,But the display just shows 16 black rectangles on Line 1. Lcr this intrigues me Yet I’m still being told to make one of the end connections to 5V. Attached snip from my datasheet which shows the pot.

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