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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Ethernet.h Ethernet.Begin(mac) only connects if i have a LiquidCrystal object from LiquidCrystal.H

I have the following code; #include <Ethernet.h> #include <SPI.h> #include <LiquidCrystal.h> LiquidCrystal lcd(31, 30, 29, 28, 27, 26, 25, 24, 23, 22); byte mac[] = { 0xDE, 0xAD, ...
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29 views

Why is my LCD I/F PIN ADAPTER won't work

I bought this on the store near us. Here is the PDF for it. https://www.e-gizmo.net/oc/kits%20documents/new%20LCD%20with%20converter/LCD%20IF%20pin%20adapter.pdf I followed the instructions below ...
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LCD screen won't stop printing the same characters twice

I'm hoping that someone might be able to help me figure out how to prevent my LCD from giving me double digits (i.e. 55, 66, 77 - instead of 5,6,7); I have 2 functions that are printing, so I'm ...
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30 views

a code to implement a simple traffic signal and also display on LCD which color is ON?

I have tried code given below for simple traffic signal and also display on LCD which color is ON, but it didn't work. Please me to make it work. int red = 10; int yellow = 9; int green = 8; #include ...
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Motor is vibrating in one direction

When I test this program, the motor starts vibrating when proxy1 is low and proxy2 is high. The displayed text also goes wrong. #include <LiquidCrystal.h> LiquidCrystal lcd(8,9,4,5,6,7); int ...
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42 views

LCD displays bad character while counting rotation

I have been practicing RPM and rotation counter in arduino using infrared optocoupler. I try to implement number of rotation for drill machine but whenever drill starts to rotate, LCD prints bad ...
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34 views

I tried making a digital tachometer using an IR sensor but my lcd display is showing random characters

#include<LiquidCrystal.h> LiquidCrystal lcd(12, 11, 6, 5, 4, 3); float value = 0; float rev = 0; int rpm; int oldtime = 0; int time; void isr() //interrupt service routine { rev++; } void ...
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qMenuSystem using DigoleSerial library doesn’t work on my I2C Monochrome OLED

Just like the title says I’m trying to make qMenuSystem to work with my oled display. Here is what I know so far about my display : - It's a Monochrome OLED 128x64 (Blue) Display - It's connecting ...
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25 views

qMenuSystem Oled I2C can't make it work

I'm trying to make the qMenuSystem to work with my I2C Monochrome OLED display but without any luck. To summarize all here's what's with it : - the qMenuSystem is using a library called : ...
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56 views

LCD shield submenu

I need to make an app that does various functions regarding IR signals (remote-like) I need to create a sub menu in order for me to access multiple functionalities. Arduino-Uno-Menu-Template I used ...
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59 views

Arduino Ultrasonic Sensor and LCD - Help Needed-

I just recently purchased an Arduino Uno 3 and I wanted to make an ultrasonic distance sensor that outputs the readings to a 16x2 LCD. I followed this guide: http://www.mertarduino.com/using-...
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62 views

Using a 122x32 LCD display with u8g2

I recovered a 122x32 graphic LCD display, its reference is NMTB-S000087FYHSAY-04. Here are some pics It was retrieved from a completely rusted object, but the screen seems to work. It is a 122x32 ...
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53 views

Error: “'lcd' does not name a type” using LiquidCrystal library

I'm following an online Arduino tutorial/course and trying to make a simple moving character on an LCD screen, but for some reason I get the following error: "error: 'lcd' does not name a type". I'm ...
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34 views

I´m trying to make a kind of videogame with Arduino UNO

it´s a school project, but I'm having some problems to create a menu selection. In the LCD, all the character are overwriting, I'm a beginer, so i dont have any idea of what i was doing wrong (ps.: ...
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58 views

Two Arduino Control a LCD Display

I´m building a system that has two arduinos (like the image on the botton) linked via ICSP. The "Programer" programs the second one, called "Worker"( with a .hex file in the SD card of the Programer)....
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30 views

Sending code for error detection facing problem with error not able to compile code

MY PROJECT CODE: #include ESP8266WiFi.h #include LiquidCrystal.h #include FirebaseArduino.h> #include HX711.h> #define FIREBASE_HOST "iot-based-smart-dustbin.firebaseio.com" #define ...
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2answers
66 views

How to read distance of passing object?

Ok, guys this is my first post and I am new to Arduino but somewhat familiar with programming so I hope you guys can assist me. If any of this is confusing, I apologize in advance! :) I want to be ...
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193 views

Timer Countdown to control relay (multiple functions in void loop)

I'm trying to build this project with a simple code. Object is to hit up button to increment minutes or down to decrement minutes then hit start to start countdown, while its counting relay will turn ...
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1answer
85 views

16/2 arduino I2C lcd display not lighting up?

I am working with an I2C lcd display with an arduino uno board I have connected the gnd pin to gnd of arduino uno and the vcc pin to 5V of arduino uno and the display is not even lighting up there is ...
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24 views

TouchScreen GUI Reference Guide Help

Recently I have gotten some Touchscreens to add to my projects and I am very excited to use them. However, I am not sure where I can find a guide to help me create my own GUI with the touchscreens. ...
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109 views

Controlling 16x2 LCD backlight (I2C module)

I've installed an I2C module on my 16x2 LCD so i don't have access to all those LCD pins to control the backlight LED. BUT there is a 100 ohm smd resistor in series with anode of the backlight LED, i ...
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102 views

lcd.clear doesn't work with Serial.begin(9600) on Arduino Mega 2560

So I have a standard 16x2 LCD display with 16 pins. The LCD display works fine with every other aspect, however, the "lcd.clear" function doesn't work with "Serial.begin(ANY BAUD)". I have tried ...
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66 views

Is this the right way to blink a character on LCD?

The code is this: #include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 16, 2); unsigned long blinkTime = 0; int ValueA = 22; String placeHolder = " "; void ...
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26 views

Controlling UC1638 Graphical LCD screen (C, with Arduino)

I am using Arduino Uno, trying to control LCD screen type UC1638 (240x128 monochrome) I want to fillup the screen in black). Searching up the internet I ended up using this code (written in C): /* ...
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71 views

20x4 LCD shows up as 20x2

I need help with my LCD. I have a 20x4 LCD and it shows up as 20x2. The LCD address said "// Set the LCD address to 0x27 for a 16 chars and 2 line display". I changed it which says "// Set the LCD ...
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69 views

How to modify a created byte?

I have created a byte for 16x2 LCD. It is basically a custom character which I will have to change later. byte char[8]{ B10000, B01000, B00100, B00010, B00001, B11000, B11100 }; I want to ...
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41 views

LCD on top of SD datalogger flickers help!

I have a problem with my 16,2 with buttons lcd shield.(LCD Keypad Shield). It is connected on top of an SD dataloger. I came to the conclusion that every time the sd shield logs data and completes the ...
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1answer
52 views

Arduino controlled LCD 16x2 is very very dim

I was testing out whether my 16x2 LCD works. I hooked it up to the arduino. Some white box appeared which probably meant it works fine, but the box and the blue background looked very dim even when ...
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25 views

16x2 lcd lighting up blue but not showing any text

i should probably start off by saying i am really new to this stuff and have barely any idea what i'm doing. i am triyng to use a DHT22 and a 16x2 LCD to show the temperature and humidity. here is the ...
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24 views

lcd doesn't show any characters , is the problem in the lcd itself?

That's my wiring besides another part of a project ( ultrasonic sensor) which works correctly on the same breadboard, Rs 12 , En 11 , d4 8 , d5 9 , d6 10 , d7 13 I tried to change power of arduino ...
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1answer
79 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: ...
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41 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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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
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1answer
33 views

Code and wire a LCD and button [closed]

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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39 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 ...
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1answer
96 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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38 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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32 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
34 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 ...
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1answer
32 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 ...
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1answer
48 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
50 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
78 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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33 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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132 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 ...
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1answer
303 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 ...
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1answer
71 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
43 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 ...
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1answer
59 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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228 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 ...