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Questions tagged [lcd]

LCD stands for "Liquid Crystal Display" and is commonly known as a screen. The tag should be used for questions related to LCD display.

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How to connnect Arduino to Wemos D1 (send data)? [closed]

I made a project with an Arduino Uno, a 16x2 LCD display and a DS18B20 temperature sensor. It shows the temperature in the display: I want to connect it to Internet so I got a Wemos D1 Mini. It works ...
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2answers
866 views

How to solve the white blocks on LCD keypad display?

I have just bought my first Arduino (a Mega 2560 R3 clone by ELEGOO), and I got a cheap LCD display to go with it. I cannot for the life of me get it to display anything other than a row of white ...
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1answer
6k views

Reading SMS using Arduino Uno and SIM800L and print on LCD (16x2 alphanumeric) using serial connection NEED HELP

Well, I am making a device, which has to receive SMS and print the text using am LCD display. Now I have code that can receive SMS and store it into a string variable using serial connection. Here is ...
4
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1answer
219 views

Alternative to UART/I2C LCD displays?

I'm building a MIDI synthesizer on Arduino Uno, and am considering user interface options. I see on Adafruit and Sparkfun there are 16x2 LCD panels available that interface via I2C serial or by UART,...
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1answer
1k views

RFID + LCD + Arduino Mega 2560 = RFID not printing correctly

My Arduino Mega isn't printing the RFID card's tag it simply prints the card's 2 digits at a time but deletes the previous prints. Can I get help with this? #include <SPI.h> #include <...
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4answers
1k views

16*2 1602A LCD not displaying any character or contrast, although correct wiring

I've used my LCD display with a lot of small projects. Now it doesn't work anymore. Most of the diagrams you find online use resistors and potentiometers. However I never done that, but still got it ...
1
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1answer
257 views

I2C LCD Serial Interface Board not displaying text

The code dont gives error, but not displays "Hello World" #include <Wire.h> #include <LiquidCrystal_I2C.h> // Set the LCD address to 0x27 for a 16 chars and 2 line display ...
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1answer
111 views

Moving a character around an LCD screen - is there a better way?

I have some basic programming experience but I am a novice at both C and Arduino. I messed around with the example LCD code to try to move a character around with the onboard keypad. I also wanted ...
6
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2answers
1k views

16x2 LCD showing blocks under text

I have a LCD connected to a Arduino Mega 2560 using the instructions in LiquidCrystal library. It is not the first time I am using a 16x2 LCD but I never have encountered a problem like this. When I ...
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1answer
84 views

Does a Sparkfun Redboard Arduino Uno have built-in RTC?

I have a Sparkfun Redboard (an Arduino Uno like board based on the Atmega328P and programmed with the Arduino bootloader). I have been trying to make an accurate clock without an RTC with an LCD ...
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3answers
52 views

Combing two codes to make it work on the same time but not affecting the other code?

I am trying to make a game where there are arrows going towards an object (in this case I printed x) and you have to evade the arrows. When you press the button it is supposed to print x on the top ...
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1answer
324 views

What do the pins on this KS0107+KS0108 display do? [closed]

I got this display on ebay and I have no instructions on how to use it. I can guess what most of them do but I'd rather be sure I know what they all are instead of messing around trying to guess. The ...
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3answers
5k views

How to show the º character in a LCD?

I have a 16x2 LCD and I want to show a temperature: 23 ºC. But the º symbol is not properly shown. It shows a strange character instead of the º symbol .
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3answers
2k views

How to use a coma as the decimal separator?

I have a LCD that displays a float variable. I would like to show a comma instead of a dot as the decimal separator. float temp = 23.50; lcd.setCursor(0, 0); lcd.print(temp); I want to show 23,50 ...
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2answers
154 views

Why do I have to open Serial Monitor to display what is in loop function?

Why do I have to open Serial Monitor to display non-NaN values retrieved from DHT22, what am I doing wrong in the code below? #include <DHT.h> #include <Wire.h> #include <...
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1answer
200 views

Can I control a cellphone's lcd (+touch screen)?

I had an Xperia txt pro just laying around and tried to revive it. I burned it like an idiot using 5v in the battery pins by accident :/ So I decided to read it apart and got to the lcd, can I use my ...
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0answers
177 views

Stuck at initializing input capture

I am using MEGA 2560 with 1.8inch TFT screen. I am trying to use input capture (shown in the code below) feature along with TFT display (1.8inch TFT display). Now when I individually test the input ...
0
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1answer
611 views

MAX7219 7-segment 8-digit display in wrong order

I have daisy-chained three MAX7219 7-segment 8-digit displays and wired it according to this diagram: but no matter what library I use, the middle segment is in the wrong order when I display it. So ...
0
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1answer
602 views

Writing a value to 7-segment max7219 displays

I am new to arduino and I am trying to build an interface for my flight simulator. I am using a plugin for the simulator software which returns a float variable to my arduino, which I then want to ...
1
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2answers
511 views

for loop iterated only once

I have written a little project, it works so far as it should but the for loop is only iterated once, then the result is displayed on the LCD. #include <LiquidCrystal.h> #include <stdlib.h&...
3
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2answers
309 views

Send String to a function inside a class

I made a little class for handling menus. When creating a new instance, I pass a reference to the oled object made in main.cpp. Yet when I want to render a string using a variable, it throws an error. ...
1
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1answer
1k views

Temperature Controlled fan using arduino project regarding - LCD not displaying anything

I have connected the circuit as per the diagram below and I have got the LCD to display boxes and nothing else. What could be wrong here? Please help! Circuit diagram below - Code as follows - #...
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1answer
300 views

LCD library and timer2 CTC interrupt not working together

I want to set up real time counter along with lcd functions from LiquidCrystal library. But they don't work together. However, they work fine separately. The code is working by itself, but by ...
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0answers
88 views

Arduino - Reading the LCD TFT RAM

Good day everyone. I'm creating an Arduino program and I would like to read the LCD TFT RAM. The idea is to be able to read the LCD's RAM, do some processing, and execute code based on what we read. ...
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1answer
55 views

Reload only one variable in loop()

I need some information for the TFT screen 2.8 and arduino mega. The screen works very well and displays the data. The small problem I encounter is for the text display, the page is reloading every ...
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0answers
260 views

How to read the busy flag on LCD?

I have a standard 16x2 LCD screen and I have it hooked up to my Arduino UNO via a I2C backpack (4-bit mode). Since I want to learn about the lcd at a lower level I’ve decided not to use the LCD ...
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2answers
784 views

LCD is not showing any text

I'm using LCD QC1602A with a 10k potentiometer and changing contrast. It works well but the problem is that no text is appearing. I'm using the LCD hello world examples and a few other examples. I ...
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1answer
161 views

Osepp LCD 16x2 Screen Printing Out Pixels In Random Spots [closed]

So when I run this code down below the part where it prints out "MountainOS" works but my other print statements below it don't. Anybody know what is going on? #include <LiquidCrystal.h> #...
1
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1answer
45 views

HD44780 Extended non-display DDRAM?

According to page 10 of this PDF https://www.sparkfun.com/datasheets/LCD/HD44780.pdf The HD44780 has enough DDRAM to operate an 80 character display. A 16x2 display has 32 characters meaning we have ...
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2answers
235 views

Analog output low voltage issue, how to troubleshoot

I have connected my arduino according to the schematics in the image, with a few additions. The setup A DC motor (water pump) drawing power from Vin, going to ground via a transistor based in A0 ...
3
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1answer
701 views

Yet another display 16x2 not working with arduino

I found hundreds of questions about display not working with arduino. However, no matter how trivial this looks like I am having the same problem I cannot understand by reading the other posts. I ...
2
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4answers
349 views

lcd not display

is it my coding wrong or my board have problem because my lcd does not display anything. here my coding #include <Wire.h> #include <LiquidCrystal_I2C.h> // set the LCD address to 0x27 ...
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2answers
374 views

Problem with 16x2 LCD using Arduino

I've connected the circuit as shown in https://www.arduino.cc/en/Tutorial/HelloWorld?from=Tutorial.LiquidCrystal and I ran the program, but I can't fix this problem: the LCD seems not to respond ...
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0answers
276 views

Dimensions for Adafruit RGB 16x2 Character LCD + Keypad Shield Cover

I'm looking to make a cover for the Adafruit lcd-shield: However, there are some dimensions missing from the provided pictures (namely the horizontal location of the various buttons) Does anyone ...
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5answers
768 views

Adding an LCD to Uno but not enough pins left

I am an absolute beginner and wanted to build a simple home automation system using DTMF module using this guide. My problem is out of 12 pins most of them are getting used in DTMF module(5) and the ...
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1answer
1k views

ESP8266 connecting keypad and lcd display

I have ESP8266 type - I have added a keypad With a standard lcd display. I have connected the keypad from d0 to d7, however after watching some tutorials i have to connect the lcd display(SDA,SCL)...
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1answer
2k views

5 inch TFT LCD for Arduino

I want to use a 5 inch 800x480 TFT display (touch not needed) with an Arduino (mega, uno or due). I'm thinking of buying this display: link (buydisplay.com). How can I connect this ? I have also ...
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2answers
218 views

OLED display crashes when connecting USB

I got an 16x2 OLED Display (DEP 16201-Y , compatible to the HD44780 controller) for my Arduino Uno and I got it to work in 4-bit Mode, but just if the USB isn't connected and it is powered by a 9V ...
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0answers
240 views

Restarting Arduino changes cursor position on OLED

I got an 16x2 OLED Display (DEP 16201-Y , compatible to the HD44780 controller) for my Arduino Uno and I got it to work in 4-bit Mode. Code: #include <LiquidCrystal.h> LiquidCrystal lcd(13, 12,...
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1answer
25 views

Very bright cursos positions

As you may can I see on the picture. I try to display the word "goodbye". Yet the problem is that the cursor positions are to bright. I hooked up a 10k ohm potmeter to the Anode. To change the ...
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1answer
3k views

Rotary encoder I2C LCD menu

I am trying to make a menu for a monitoring/control system. I am not sure how to make this without interrupting my current code which needs to be monitoring my system at all times to shut off if it ...
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2answers
475 views

Can't print on LCD

I'm a newbie here. And sorry for my bad English first of all. Right now I'm working on VLC (Visible Light Communication). I have working code, in which output is displayed on the Serial Monitor. But ...
3
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1answer
118 views

Compatibility between shields

Despite that I am new to Arduino, I am tasked to invent a serious alarm system and I chose Arduino. I study electronics, but virtually I am a software programmer and C is my area of expertise. I ...
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2answers
86 views

Partially clean a LCDScreen

I have connected an 16x2 LCD to my Arduino. It shows my Room Temperature and Behind that variable is the string "Celcius". Everytime the temp is diffrent than shown on the screen it updates the screen ...
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0answers
59 views

LCD Display issue with PCD 8544

I have been scratching my head since couple of days to solve a lcd display issue. Problem-1: As I read from the datasheet of PCD8544, I can set x, y position to (0, 0) by writing command 0x80 and ...
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1answer
136 views

I got this ILI9341 *i 'm not sure * from ebay and i cant manage to use any librarys

I have Arduino Uno R3 i can't mange to upload code for the display . I tried to use librays from this http://www.buydisplay.com/default/arduino-2-4-inch-tft-lcd-touch-shield-li9341-library-for-mega-...
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2answers
137 views

Hardware interrupts for buttons not directly assigned to pins

The Adafruit LCD shield offers an LCD and access to 4 button, using only a two wire connection with the Arduino. This is achieved with the MCP23017 I2C port expander IC. These buttons are not ...
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1answer
167 views

Library not found

The error is: C:\Users\jerem\Desktop\ARDUINO\LCD_TEXT_JA\libraries\sketch_jun06a\sketch_jun06a.ino:5:28: fatal error: LiquidCrystal .h: No such file or directory #include <LiquidCrystal .h> ...
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0answers
244 views

Wiring Feather Huzzah ESP8266 to Monochrome 1.3" 128x64 LCD

I'm new to Arduino and the pinouts for the Adafruit 938 LCD doesn't seem to match the pinouts that I looked up for the Huzzah ESP8266. Does anyone know the proper pinout for this display and the ...
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1answer
134 views

Controlling TFT LCD with Arduino

I bought this LCD module. How many pins does this LCD module uses? They have written in the product description that this LCD module uses 8 bit communication, but the LCD module has 16 bit pinout (DB0-...