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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From your original post: Did you check this link form the page you linked to?

Blog of Wei-Hsiung Huang: Arduino I2C LCD A

It’s even worse with a 10k, which is at about In depends on how it’s designed to be wired. Sorry for wasting everyone’s time. D3 don’t use what the heck is this for? I think the photo might be deceptive, or wrong.

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 keeping the pins lose and having them fit through the holes. Attached snip from my datasheet which shows the pot.

Just in case you missed it: Also it restricts other functions of the controller.

I forgot to make mention of my sketch entries supporting the lcd: 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. D2 don’t use what the heck is this for? Do not IM me. If it’s an input, then grounding it through a pot doesn’t make sense to me.


Navigation Main page Random page Recent changes. 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. If everything is correct,But the display just shows 16 black rectangles on Line 1. 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.

As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. If it’s supposed to have one side at 5V, then the pot acts as a voltage divider, probably into a signal pin.

A LCD works but doesn’t display what I programmed

It shows a datasheet of that display don’t know for sure it is your display. Privacy policy About Wiki Disclaimers. Here’s the code I am using: 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.

The default address is: Did you connect the grounds? And this intrigues me Click it open and then you’ll be prompted by “Library added to your libraries. Before upload the code ,you need to select correct Board and Port,please follow the steps: 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.


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

Je kunt hier ook in het Nederlands terecht: Are the pins on the labelled? Its schematic shows the VO on the wiper 2004a a pot between 0v Vss and 5v Vdd. What difference would this make? Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. Glad you’ve got it working.

It is a high performance serial bus which has bus ruling and high or low speed device synchronization function required by multiple host system. When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports.

No change when using lcd. It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. Retrieved from ” http: I use a 20×4 as follows on my Uno: I will not respond. 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.