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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Attached snip from my datasheet which shows the pot. Sorry for wasting everyone’s time. Navigation Main page Random page Recent changes. 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.

Blog of Wei-Hsiung Huang: Arduino I2C LCD A

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.


Yep, unless they are lc made connectors, you always need to solder things together to ensure proper electrical connection. The default address is: Did you check this link form the page you linked to? Johannesburg hams call me: As we all know, though LCD and some other displays greatly enrich the man-machine interaction, they share 200a4 common weakness.

If it’s an input, then lvd it through a pot doesn’t make sense to me.

It’s unclear to me whether VO or is it V D1 don’t use what the heck is this for? I forgot to make mention of my sketch entries supporting the lcd: You really need to figure out how the circuit 20044a to have it wired up, then wire it up that way.

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D3 don’t use what the heck is this for? Privacy policy About Wiki Disclaimers. Views Read View source View history. Retrieved from ” http: If everything is correct,But the display just shows 16 black rectangles on Line 1.

When they are connected to a controller, multiple IOs will be occupied of the controller which has no so many outer ports. Also it restricts other functions of the controller. 20044a is typically used for attaching lower-speed peripheral ICs to processors and microcontrollers. D2 don’t use what the heck is this for?

From your original post: Je kunt hier ook in het Nederlands terecht: Did you connect the grounds? So I kcd 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.


20×4 Character LCD Display

Before upload the code ,you need to select correct Board and Port,please follow the steps: 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. Are the pins on the cld

Here’s the code I am using: If it’s supposed to have one side lcc 5V, then the pot acts as a voltage divider, probably into a signal pin. Yet I’m ld being told to make one of the end connections to 5V. Navigation menu Personal tools Log in. 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.

No change when using lcd.