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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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1answer
19 views

HD44780 DDRAM addressing on the second line

I write bytes to HD44780 display DDRAM to display characters and it works weird on the second line. I use 16x2 model and I write "0123456789" string from address X on. According to the datasheet: ...
0
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0answers
22 views

20x4 LCD Error. 8 black boxes to the left on row 3 and 4

20x4 I2C conected LCD. 8 black boxes to the left on row 3 and 4. What could the problem be?
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0answers
13 views

How to wire an lcd and a button [duplicate]

Anyone know how to wire a lcd with a button to react when the button is pressed and print on the lcd
-1
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1answer
21 views

Code and wire a LCD and button [on hold]

I need to code and wire: “Button is pressed.” to an LCD screen when a button is pressed. When the button is released, the LCD should display, “Button is released.” NEED HELP!!!
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0answers
19 views

Using 16x2 LCD code causes error in sensor reading

I haven't done much programming with Arduino, compared to my previous projects this one is kind of a major one. I have one of these DIY Filament extruder , I am trying to add Filament puller and ...
0
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1answer
39 views

LCD Display 128x64 weird pin, C86 (input)

I got some LCD display from my friend. Base on the model number (TopWay LM6023) printed on product, I found the data sheet from google. According to the datasheet, it is a 128*64 LCD display, but I am ...
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1answer
34 views

Make one button print different sentences on LCD

I am very new to arduino and I've been scratching my brain on how to make one button print out three different sentences. When I press it the first time, a " I am " is suppose to appear, when I press ...
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0answers
19 views

Morse Interpreter-(Problem on giving output with LCD Nokia 5110)

I am working on a project where my goal is to give an input from the key(button) with Morse alphabet and project it on an LCD screen and on the second phase I will also be adding a microphone system ...
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2answers
33 views

Cannot make LCD & Gyro work together

I'm new to this so there are some poor methods in my code when I try to introduce the LCD into the loop. My issue is that the LCD delay and the servo delay are interfering with each other. How can I ...
0
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1answer
30 views

Two buttons, one LCD

I'm trying to make a program that whenever a button is push, a different word will show on a lCD screen. However, it seems that the two buttons provide the same output ("Screen A"), it's like there is ...
0
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1answer
25 views

Byte text file to array [closed]

I'm trying to display a bitmap on gLCD 128x64, I stored the bitmap into txt file 1.txt in a SD card this is a part of bit map as following: 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,...
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1answer
48 views

Can't swipe between RTC and some event

Some ideas please? I'm stuck and also don't judge me for how i wrote the code. I'm new into coding and still learn. So, the idea is that i want to display data and clock on lcd but when the lamp is on ...
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2answers
67 views

arduino LCD help

I am trying to create smart clock with alarm using an Arduino Uno. My problem is when I set the alarm, I can't set the alarm again. Every time I must power off my Arduino and then power on in order ...
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0answers
27 views

GSM and LCD functions don't work together

I'm trying to create a system that allows me to water my plants and turn on the LED strips through SMS. I'm also displaying data from the sensors on an LCD. Both of these things work separately. When ...
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0answers
75 views

Only half of the 16x2 LCD appears

I searched for answers but I didn't found any answers to my problem. Actually, I use my Arduino with a 16x2 LCD screen. But as the title says, only the half of the screen displays (8x2), the other ...
0
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1answer
39 views

How to Connect TFT LCD display with NodeMCU?

I am doing this project wherein I want to display some image on the LCD screen. I am having a problem with the connecting nodemcu with my TFT LCD screen. I cannot find any references. Does a TFT ...
-1
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1answer
68 views

Why LCD 16x2 cannot display “water leaking” when rain sensor detects water?

#include <SoftwareSerial.h> #include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); SoftwareSerial mySerial(0, 1); int gas_sensor = A5; int water_sensor = 8; int buzzer = 9; int ...
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1answer
37 views

LCD displaying weird text

I am doing a project that requires input from a keypad to be displayed on the LCD display. lcd.print() displays in proper form, but when the I press characters on the keypad, they are overwritten as ...
0
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1answer
44 views

Adafruit RGB LCD w/ Shield kit connection to arduino uno? [duplicate]

I have a adafruit rbg 16x2 lcd with shield kit and am trying to connect it to an arduino uno. The only thing is the assembly instructions have the lcd basically using every pin on the arduino, even ...
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0answers
52 views

20x4 lcd display problems

I was recently experimenting with 20x4 lcd display with my Arduino Mega board. The connections which I followed are shown in the picture attached. I am very much sure about the connections and code ...
0
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0answers
39 views

Arduino stuck when I disable Timer 2 Interrupt

#define TIM2_EN() (TIMSK2 = 0x02) #define TIM2_DIS() (TIMSK2 = 0x00) //HEART SENSOR // Include Libraries #include "Arduino.h" class PulseSensor { public: static void begin(int pulsePin); static ...
0
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2answers
32 views

I am getting blocks on my lcd screen 16*2

When I have tried interfacing my 16*2 LCD with Arduino I am getting only the black coloured boxes on my screen. What might be the problem? Is there any solution to that? Do I need to connect any ...
1
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1answer
87 views

16 X 2 LCD display blank with Arduino Uno

So I am following this tutorial to make my arduino display hello world and millis(), I got it to work for a minute, but then it stopped updating the milliseconds, and when I pushed the reset button it ...
0
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1answer
29 views

Mapping segments and memory allocation on a segment LCD driver [closed]

I've just configured a segment LCD and driver, everything works fine, but because I decided to not use vias on the PCB, the connections between the two are mixed. To be more precise, in order to ...
1
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1answer
37 views

Wire.h missing - Failing to upload I2C 16x2 LCD sketch

I am total newbie in Arduino and for the last 3 days I am trying to figure this out. I would like to use an I2C display for a project. I have installed the LiquidCrystal_I2C, but when I try to upload ...
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0answers
13 views

NodeMCU with JHD162A LCD issue

I have uploaded a program to NodeMCU , to print "hello, world" on JHD162A 16x2 LCD module. But the text doesn't appear on the lcd display. Instead just black blocks appear on the first row on the LCD. ...
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1answer
162 views

What does the numbers behind lcd (0x27) means?

I can't seem to figure out what the numbers in after 0x27 means. I understand that 0x27 stands for I2C address and POSITIVE stands for the back light, but what does the other numbers mean? ...
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0answers
52 views

How to interface Arduino with NXP PCA8561 LCD segment driver?

I've just bought few NXP PCA8561AHN LCD segment drivers to do some tests which unfortunately did not went as expected. I'm familiar with expanders and segment LED displays but LCDs seem to be way ...
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0answers
65 views

How to fix this error?

Arduino: 1.8.8 (Windows 10), Board: "Arduino Nano, ATmega328P (Old Bootloader)" libraries\TimerOne\TimerOne.cpp.o (symbol from plugin): In function `TimerOne::isrDefaultUnused()': (.text+0x0): ...
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0answers
32 views

EEPROM.read data not comparing with DHT11 sensor value - Arduino temp controller

I'm using a DHT11 to read temperature to control a relay that will control a fan. When 'A' is pressed it allows the user to update the temp value that the relay will go HIGH at. The value is being ...
0
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2answers
58 views

How to perform two tasks in one loop in Arduino?

I am trying to make a weather monitor using Arduino. I want my weather monitor to send me a message of the weather data every 5 hours using GSM sheild. Also, there is an LCD on my weather monitor ...
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0answers
43 views

LCD displays weird characters

I have connected the LCD by the 3 wire method using the LiquidCrystal595 library+74HC595 register shift; sometimes "hello world" is displayed but other times the LCD displays weird characters. How to ...
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0answers
79 views

White squares LCD display

for a school project I need to program a display. I've got in almost working. I made a setup screen in the setup() that just says our groupname and the name of our project for 8 seconds (this works ...
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0answers
55 views

Arduino nano -> 74HC595 -> LCD display

Greeting to all, Newbie in the contraption above (Arduino nano -> 74HC595 -> LCD display); I would like some help from the experts. I connect the 74HC595 to the LCD display using the 4 wires as ...
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1answer
71 views

LCD displays an “A” instead of 0

I am trying to make a timer that has a accuracy up to 1 tenth of a second. However when it is suppose to print "0", it will print an "A". For example, when printing "10", it will print "1A". This ...
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1answer
28 views

Arduino LCD (16,2) - sequential display [closed]

How does one update the display in a LCD (16,2) in Arduino, say for example I want to display an additional characters or (sequential characters) characters and the screen is full?
0
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1answer
68 views

Serial.print prints but lcd.print does not

The following code reads a txt file from a SD card, finds the corresponding character and prints the next 12 characters: ... char temp; byte who = random(1, 13); // 1 to 12 temp = ...
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1answer
40 views

Arduino scrolling text program freeze after some time

I use a 16x2 character lcd to display some text. What I want is first line will stay, but the second line should scroll text. I wrote a program which works fine but the problem is after some time ...
0
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1answer
85 views

LCD shows output without pressing the sensor

#include<LiquidCrystal.h> LiquidCrystal lcd(13,12,11,10,9,8); #define vibrate_sense 7 char str[70]; char *test="$GPGGA"; char logitude[10]; char latitude[10]; int i,j,k; int temp; //int ...
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1answer
50 views

Why my LCD does not work with this if statement?

#include <LiquidCrystal.h> LiquidCrystal lcd(1, 2, 4, 5, 6, 7); int greenLedPin = 12; int blueLedPin = 11; int redLedPin = 8; int yellowLEdPin = 9; int lightSensorPin = A0; int analogValue = 0;...
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1answer
203 views

Docs for using i2C LCD with Newliquidcrystal_1.3.5 library?

I bought a 20x4 I2C LCD from OddWires. (https://www.oddwires.com/20x4-lcd-display-with-i2c-interface/) It came with ZERO specs or documentation. After some hair-pulling I was able to figure out how to ...
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1answer
232 views

Want to display an image from SD card to ILI9486 LCD display

I am completely new to Arduino. I have been given a side project to display a image from SD card to display. LCD used is ILI9486 which has a SD card slot at the back of the display module. I have ...
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2answers
55 views

Which LCD Pins, if any, require PWM?

In the Arduino Tutorial Page named "Hello World" aimed to help people connect a 16x2 LCD Display compatible with Hitachi HD44780 driver to an Arduino Uno. The pins used to connect the Arduino Uno and ...
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1answer
44 views

Unable to set LCD contrast using DAC pin on ESP32

I have followed the instructions at https://www.arduino.cc/en/Tutorial/HelloWorld and have my LCD displaying some text. I've also connected the LED back light (LCD pins 15&16). I wanted to ...
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1answer
56 views

How can we use two devices at the same time with arduino?

I am using fingerprint module r307 and LCD together. In that, I am using 2,3 digital pins of arduino for data transfer to the fingerprint.(I tried other pin configurations for this but it didn't work) ...
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1answer
139 views

Why does my 16x2 LCD displays weird letters and can't insert key from keypad?

I'm a newbie on Arduino here, and this is my first project on 16x2 LCD, 4x4 keypad and others. So, the story is, after I uploaded the program for my group's Arduino alarm clock to the Arduino board, ...
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1answer
105 views

LCD lights up but shows no text

I've connected an LCD display to an Arduino Uno following the instructions from the Adafruit LCD lesson. I've used the code sample described in the Adafruit lesson. What happens after I connect the ...
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1answer
158 views

Data loging while browsing a menu on LCD shield

I'm new in arduino and not particularly awaken when it comes to code ;) . I'm developing a device SD logging Temperatures from 2 thermocouple . Hardware works well and I'm now trying to refine use of ...
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1answer
76 views

Use a button on LCD shield to pause the code

I'm creating a Temperature logging device with thermocouple K and SD card breakout and a RGB LCD Shield Kit w/ 16x2 Character Display (with buttons). Everything runs ok: temperature displaying on the ...
0
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1answer
100 views

Random characters generated by LCD during serial.read()

I am using the following codes to print characters on LCD display.... #include <LiquidCrystal.h> const int rs = 8, en = 9, d0 = 4, d1 = 5, d2 = 6, d3 = 7; LiquidCrystal lcd(rs, en, d0, d1, d2, ...