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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Sorry for wasting everyone’s time. As we 2004z know, though LCD and some other displays greatly enrich the man-machine interaction, they share a common weakness. When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports.

Je kunt hier ook in het Nederlands terecht: If it’s an input, then grounding it through a pot doesn’t make sense to me. Retrieved from ” http: I will not respond. I use a 20×4 as follows on my Uno: Also it restricts other functions of the controller. If it’s supposed to have one side at 5V, then the pot acts as a voltage divider, probably into a signal pin. lfd

No change when using lcd. Click it open and then you’ll be prompted by “Library added to your libraries. Here’s the code I am using: Before upload the code lvd need to select correct Board and Port,please follow the steps: I think the photo might be deceptive, or wrong. Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. Johannesburg hams call me: 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.


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?

It’s unclear to me whether VO or is it V If everything is correct,But the display just shows 16 black rectangles on Line 1. It’s even worse with a 10k, which is at about From your original post: Did you check this link form the page you linked to? Have a look at “blink without delay”. 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.

I forgot to make mention of my sketch entries supporting the lcd: It is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers.

Sorry to second guess you experienced folks but I’m just concerned about potentially shorting something since it is working fine as it lcf unless the way I have it setup now is already shorting something. In depends on how it’s designed to be wired. 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.


Navigation Main page Random page Recent changes. Are the pins on the labelled? Do not IM me. What difference would this make?

I2C 20×4 Arduino LCD Display Module

Just in case you missed it: Navigation menu Personal tools Log in. D2 don’t use what the heck is this for? You really need to figure out how the circuit intends to have it wired up, then wire it up that way. D3 don’t use what the heck is this for?

LCD 20×4 Blue Backlight Parallel Interface Display Module A | QQ Online Trading

Enough of them ocd making contact to supply power to the backlight but the ones necessary to receive information from the Arduino were obviously not touching.

Glad you’ve got it working. Views Read View source View history. This page was last modified on 5 Augustat