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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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It shows a datasheet of that display don’t know for sure it is your lcc. You really need to figure out how the circuit intends to have it wired up, then wire it up that way.

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.

This page was last modified on 5 Augustat JimboZA on Oct 12, It’s unclear to me whether VO or is it V Yet I’m still being told to make one of the end connections to 5V.


It’s even worse with a 10k, which is at about Views Read View source View history. Johannesburg hams call me: Here’s the code I am using: D3 don’t use what the heck is this for?

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. D1 don’t use what the heck is this for? 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.

Do not IM me.

A LCD works but doesn’t display what I programmed

Glad you’ve got it working. Je kunt hier ook in het Nederlands terecht: Retrieved from ” http: 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 will not respond. From your 200a4 post: Its schematic shows the VO on the wiper of a pot between 0v Vss and 5v Vdd.


If everything is correct,But the display just shows 16 black rectangles on Line 1.

Yep, unless they are purpose made connectors, you always need to solder things together to ensure proper electrical connection. Also it restricts other functions of the controller. Click it open and then you’ll be prompted by “Library added to your libraries.

If it’s an input, lcs grounding it through a pot doesn’t make sense to me. Are the pins on the labelled?

Blog of Wei-Hsiung Huang: Arduino I2C LCD A

Navigation Main page Random page Recent changes. Have a look at “blink without delay”. I forgot to make mention of my sketch entries supporting the lcd: Did you connect the grounds?

So I finally got it 20004a, turns out it is necessary to ocd 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.

And this intrigues me