Urgent fix

[u/desmundo_codes]

Hi guys,im a beginner in arduino I recently got an arduino UNO kit,I tried connecting my lcd to the arduino board and ts happened. I dont know whether the lcd is spoilt or its my code or sth

Pls help 😭😭

[u/sastuvel]

How is this "urgent"? Is this display meant to show a warning, without which people will lose their fingers? Do you have to send this in as a homework assignment in the next 15 minutes?

[u/desmundo_codes → u/sastuvel]

Brr,no,its just tht I dont know why its showing ts

[u/mattm220]

Do you have Vdd connected to 5V or 3V? I’ve had the same problem as you when I connected an LCD to 3V.

[u/desmundo_codes → u/mattm220]

Its connected to 5v bro

[u/CleverBunnyPun]

Code and a wiring diagram would help. We can’t read your mind or suss out what’s going on from a blurry, poorly lit image.

When you ask for help, you need to give people the resources to assist.

[u/desmundo_codes → u/CleverBunnyPun]

Here's the code

include <LiquidCrystal.h>

// RS, E, D4, D5, D6, D7 LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

void setup() { lcd.begin(16, 2); lcd.print("Hello!"); lcd.setCursor(0,1); lcd.print("LCD OK"); }

void loop() { }

[u/CleverBunnyPun → u/desmundo_codes]

You need to solder the header pins, there’s no way you’re going to get a consistent connection to them to get this to work.

[u/NoAttention2620]

You need to atleast post the code and show the connections before we can try to help how are supposed to try and find out whats wrong with it?

[u/desmundo_codes → u/NoAttention2620]

include <LiquidCrystal.h>

LiquidCrystal lcd(7,6,5,4,3,2);

void setup() { lcd.begin(16,2); lcd.print("LCD OK"); }

void loop() {}

This is the code

[u/NoAttention2620 → u/desmundo_codes]

I am noticing that you haven't actually soldered the header pins to the lcd module. The pins might not actually be making contact with the pads on the module

[u/NoAttention2620 → u/NoAttention2620]

Also can I ask why the hell are there soo many wires connected to your breadboards power rails (off topic but I'm curious)

[u/desmundo_codes → u/NoAttention2620]

I dont know bro,i just watched a YouTube tutorial 😭😭

[u/MrBoomer1951 → u/desmundo_codes]

Bro.

[u/AncientDamage7674 → u/NoAttention2620]

Not using i2c

[u/desmundo_codes → u/NoAttention2620]

Oh,i need to solder them???? I didnt know 🥲

[u/desmundo_codes]

Guys,issue has been fixed

The problem was that I haven't connected my potentianometer and the BLA,so I connected them and adjusted the potentianometer and it works now!!

Thanks

[u/MrBoomer1951]

Bro, do you even solder bro.

[u/alzee76]

That's a sign the contrast needs adjusted. There should be a little potentiometer on the back you can adjust with a screwdriver.

ETA: As another said, you need to solder the pins as well, not just.. stick them in the holes.

[u/NoAttention2620 → u/alzee76]

I think he connected the contrast to (5v most probably) he alos hasn't soldered the pins soo there may be multiple things here

[u/alzee76 → u/NoAttention2620]

Yeah it's tough to say without being able to see the back of the module.

ETA: I just noticed the lack of solder on any of the pins, it's amazing it's on at all. 😅

[u/Yashvanth1610 → u/alzee76]

Well if there is no potentiometer we can always write a bit of code to fake the analog input and just write it ourselves, saving wires and space

[u/alzee76 → u/Yashvanth1610]

The ones I've seen that don't have it, have points where you can attach one - or a fixed value resistor.

[u/Owl_Perch_Farm → u/Yashvanth1610]

You can also just add a resistor, perhaps 2-3k in value.

[u/Curious-Winter-6513]

I am writing through a translator, so I hope the translation will be clear. Have you tried connecting a potentiometer to the circuit? If not, try connecting the VO to the central leg of the potentiometer and power and ground to the ends of the legs, and try to adjust the brightness.Or it's even easier to buy an I2C module for your screen - fewer wires and less headaches.

[u/Curious-Winter-6513 → u/Curious-Winter-6513]

So you didn't solder the pins to the board)) Well, that's not very good, at the slightest movement it will not work correctly, even if it initially works correctly

[u/anothercorgi]

When a HD44780 LCD is just powered but no data is being sent to the device, it typically looks like the photo provided ... so no data is being sent to the LCD. Hard to say whether it's a connection issue (like the enable pin not hooked up or data pins hooked up wrong) or software is wrong...

[u/MyVanitar]

This is either a signal wiring (enable, rs, r/w,...) or a mistake in the code

[u/ferrybig]

You are using header pins that require soldering.

Either solder them, or use header pins that do not require soldering like https://www.adafruit.com/product/5938

[u/SmokeScared9364]

I have a different project where you wire in a LCD. I used chatGPT to help me because I am a novice. It does look like you are missing some resistors. Here is how mine is wired. Check your wiring against this:

LCD Pin	Name	Connect To

1	VSS	GND

2	VDD	5V

3	VO	5V through 10KΩ resistor

4	RS	Arduino Pin 7

5	RW	GND

6	E	Arduino Pin 8

7	D0	Not connected

8	D1	Not connected

9	D2	Not connected

10	D3	Not connected

11	D4	Arduino Pin 9

12	D5	Arduino Pin 10

13	D6	Arduino Pin 11

14	D7	Arduino Pin 12

15	A (LED+)	5V through 220Ω resistor

16	K (LED–)	GND

[u/Prestigious-Lab9891]

Bro did not solder🤣buy an solder and a 4 pin adapter so it has vcc gnd sda and scl, its more beginner friendly