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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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Wiring parallel TFT with ESP32

I have this Parallel LCD TFT. I want to connect it with an ESP32 (NodeMCU). I am using the TFT_eSPI library. In the TFT_eSPI documentation, it says that the connection should be as following: // The ...
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1answer
53 views

Arduino program has suddenly stopped updating

I am writing a speedo/odometer program which was all working beautifully until I introduced an LCD screen and code for the LCD. The screen works on power up, displays the distance recorded on an SD ...
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1answer
68 views

16*2 LCD display doesn't display my result

I am working on a project to calculate line frequency meter by reciprocal counting with Arduino. I am trying to print the the result on a 16*2 LCD but it is not displaying anything. It just gets on ...
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1answer
689 views

Connecting LCD TFT shield to NodeMCU

I have the following screen: I want to connect it to a NodeMCU device: I read somewhere that it is not possible. However, I am not interested in the touch ability nor the SD card. I just want to ...
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1answer
53 views

making a LCD dice for catan

when I go to upload the code, I get Arduino: 1.8.5 (Windows Store 1.8.10.0) (Windows 10), Board: "Arduino/Genuino Uno" C:\Users\taran\Documents\Arduino\dice in progress\dice in progress1\...
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50 views

How to connect to LCD and communicate via serial usb simultaneously? (UNO)

Pretty simple home automation project I am working on. I'm trying to hook my arduino which has a 16x2 LCD, DHT22 temp/humidity sensor to my Pi via usb. I want to be able to maintain the values on the ...
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1answer
25 views

Button isn't working properly

I am new in arduino trying to make race game. My problem is that my button (all buttons) is working sometimes and sometimes not. I am pretty sure that it's because of my code. Could you please help me ...
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1answer
129 views

Is it possible to use LCD (the 16 pins) without potentiometer?

look, I don't have any potentiometer lying around, and I don't have any variable resistor. So is it possible to instead use a fixed resistor for the LCD display ?
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3answers
689 views

Can I generate 5 sec delay within an interrupt program?

void buttonPressed() { if(ledOn) { ledOn = false; digitalWrite(13,LOW); }else { ledOn = true; digitalWrite(13,HIGH); } vout=analogRead(sensor); vout=(vout*500)/1023; ...
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1answer
34 views

Distance from Arduino UNO to LCD: How far?

How far from the UNO can I place an LCD (the typical 16x2)? Assuming that everything that is plugged into the LCD comes directly from the Arduino (power and data). I'd like to mount the LCD on the ...
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0answers
56 views

How to interface LCD?

I brought an ATmega328p chip today, which I bootloaded later on and I tried some basic circuit examples (like blink LED) with the chip (Minimizing the circuitry) and it worked perfectly fine. When I ...
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2answers
108 views

Can I use 1 clock module for multiple Arduinos?

I want to connect an RTC to a master Arduino, send the time data to a slave Arduino through I2C, then connect an LCD to the slave and print it out. can it be done? A think it would mean that the ...
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1answer
32 views

character on 16X2 LCD is not visible properly

i am using 16x2 LCD with arduino nano for my project. when i connect arduino nano with usb power supply from pc or any mobile changer adapter then all the character on LCD is visible properly. But ...
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3answers
798 views

Debouncing Multiple Buttons

I'm creating a binary calculator with my Arduino. This will take two different binary numbers and add them together. I am focusing right now on the Byte One Input screen. For this, I can use two ...
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1answer
133 views

Servo issue, won't go into negative range

I'm trying to create a small laser "turret" with x-axis control. The arduino receives input through IR sensor. I'm having a problem where my servo will preform my up and reset function(moves and ...
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1answer
44 views

LCD Weather Station - “Press To Start” Function

I've been trying to make a weather station using a I2C LCD Display and a DHT11, I know, the DHT11 is a bit low res and all that, but it came with the kit I ordered, so it's okay. However, I'm trying ...
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1answer
42 views

RGB Not displaying Red when using LCD

I was testing my RGB (common anode) on its own playing with colours and got the red, green to work as desired. However, when I connected my LCD board to my Arduino Uno as well as the RGB (using the ...
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0answers
37 views

Can I make my own TFT LCD shield? [duplicate]

I have a few TFT LCD displays lying around which I salvaged from old phones. I would really like to use them with my Arduino. I didn't get anything about making a shield on the net but only links to ...
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3answers
52 views

What do I have to change to make this code functional?

I have a joystick, an I2C 16x2 character display, and an Arduino. I want to move the joystick and get an on-screen character (specifically, the letter h) to move in the direction that I pushed the ...
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1answer
316 views

DHT 11 sensors and i2c LCD to Wemos Wifi not Working

Its my first time make arduino project. I make wemos d1 project using DHT11 temperature sensor and LCD 20x4 with i2c. The temperature data will display in LCD and sending to the bot telegram. For ...
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2answers
305 views

Keypad password check issue

I am working on a school project, basically I have to create a lock system that opens a fictive gate when the correct code is entered. We have been asked to simulate our system before actually ...
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2answers
170 views

How to detect an read buttons pressure on touchscreen [closed]

I made simple 3 red buttons like this: #include <SPI.h> #include "Adafruit_GFX.h" #include "Adafruit_ILI9341.h" #include "URTouch.h" #define TFT_DC 9 #define ...
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1answer
186 views

When the TX and RX pins for Bluetooth are connected the LCD screen will not update. Why is that?

I have connected a Bluetooth shield and LCD screen to an Arduino Uno. I have two active low push buttons to increase or decrease the variable desiredTemp. This value is meant to be displayed on the ...
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0answers
229 views

concurrent display of BMP file and text on Arduino TFT LCD screen

I am using an Arduino TFT LCD screen (1.7'') on Arduino Due for displaying .bmp file of 80X60 pixels. Is it possible to display a .bmp image on the lcd screen and also display text/draw an object such ...
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1answer
55 views

LCD Lifespans Constantly Running

I am creating an arduino alarm clock/light sculpture, but I can't for the life of me find any information about the lifespans of LCDs that are running 24/7 for a very long time. If anyone has any ...
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0answers
119 views

Problems with ST7735

I have this Arduino display that looks very similar to an ST7735 SPI display. I found out that this is the pinout by testing the VCC, Ground and LED pins, but it is not the same one, it is supposed ...
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1answer
96 views

changed behaviour in I2C LCD

I reinstalled a previously working sketch to my UNO and now the behaviour of the lcd has changed. Previously this example worked perfectly: #include <Wire.h> #include <LiquidCrystal_I2C.h&...
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2answers
702 views

LCD not displaying text

I am working with an Arduino due and currently using the Arduino liquid crystal library to display data on an LCD screen (mc42004A6wk-bnmlw) which uses the Hitachi HD44780 controller. The LCD has been ...
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1answer
122 views

I keep getting an error message and I don't know how to fix it

I am using an Arduino Genuino, this is what comes up Multiple libraries were found for "LiquidCrystal.h" Used: /home/user/Arduino/libraries/LiquidCrystal Not used: /opt/ArduinoIDE/libraries/...
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1answer
824 views

Hooking up LCD screens reclaimed from old camcorders to Arduino [closed]

Has anyone had any luck using LCD screens reclaimed from old electronics with Arduino, such as camcorders etc? My 8 yr old has an old sony handycam (dcr-trv103) in bits and now wants to use the LCD ...
1
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1answer
391 views

LCD Clock Millis Code Issue

I am trying to create a clock on an LCD when I upload the code below, all it displays is a very rapidly flashing 0:00 PM. Please help. This is my first time using Millis. #include <LiquidCrystal.h&...
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1answer
160 views

How do i run multiple functions simultaneously on a LCD screen?

I have little to no experience in programming and i'm very slowly and gradually getting the hang of it. My next project is that i'm making a clock, and wanted to use multiple functions for the hour:...
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2answers
64 views

When i press a button to subtract 1 from 5 it skips to 3

When i press a button to subtract 1 from 5 it skips to 3, it's the same when I add 1 to -5 it skips displaying - 4 and goes straight to -3. This is the code that i am using: //Testing the use of ...
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0answers
46 views

Printing to an LCD

I am trying to get the code below which records to the rpm for a fan, to print to an LCD, specifically print the value of "Calc". This code uses a number of interrupts which I do not fully understand. ...
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1answer
985 views

Creating a simple menu for Arduino LCD button shield [closed]

I am trying to create a very simple menu to use with my lcd keypad shield, I have tried looking into how tutorials say to do this but I don’t really understand them. Would it be possible to do it by ...
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0answers
38 views

Why is my keypad requiring a double-click only on the first row to register?

I have a keypad that is connected to my Arduino and each time a key is pressed, the number should be outputted to an LCD screen. The issue is that after the screen is cleared, and a new ID is being ...
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0answers
56 views

What variable name does each button have on the LCD Keypad Shield?

I just bought the LCD keypad shield and wanted to have a cursor go to the left and right when you press the left or right button. But then the problem arose that i didn't know what variable name the ...
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2answers
545 views

Wemos: 16x2 display doesn't show anything

I connected a 16x2 LCD display to a Arduino Uno. Then I tested a "Hello, Word" code and it works perfect. Now I want to do the same with a Wemos D1 Mini but it doesn't work. Here the Wemos is not ...
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1answer
2k views

How do I control the buttons on an Arduino LCD keypad shield?

I have just bought a 16x2 LCD display with buttons. I can get the display to work and do various basic sketches included in the Arduino IDE. However, I cannot figure out how to control the buttons. ...
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2answers
326 views

Help connecting ILI9341 LCD SPI Display to arduino uno

I got this lcd with touchscreen from a store but i have no idea on how to connect it to the arduino uno. Any help is appreciated. This is where i bought it from. The display My Arduino
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2answers
1k views

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
675 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
5k 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 ...
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0answers
33 views

Is there a way to fix my 16x2 Arduino LCD that shows weird stuff?

I am new to Arduino. I was trying to make an arduino LCD say "hello world". It worked with low brightness. So I switched the 5 volt and ground wires to 9 volt and ground. Now it displays lots of ...
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0answers
810 views

Ultrasonic sensor showing 0 cm

I'm new to Arduino. I am making a project using an ultrasonic sensor with LCD. But the output I am getting is 0cm. Here is my code. Please help me with that. Thanks. /* HC-SR04 Ultrasonic Sensor with ...
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1answer
197 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
904 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 ...
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1answer
186 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
83 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 ...