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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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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 ...
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2answers
28 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 ...
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1answer
50 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 ...
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1answer
24 views

Mapping segments and memory allocation on a segment LCD driver

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 ...
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1answer
30 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
25 views

Arduino communication by LCD and Keypad

My project is Arduino based. I connect the RX of the first arduino to the TX of the second and vice versa. I want to read the key which is being pressed (two digits) and send these two digits to ...
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1answer
61 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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12 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
55 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
34 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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40 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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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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0answers
22 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 ...
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1answer
131 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
54 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
25 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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1answer
1k views

Nextion Dual State Button

I am having an issue with my Nextion display. I have uploaded the following code via Arduino IDE to my Arduino MEGA 2560. My Nextion Editor shows the button as ID:9 on page0 named floor. I am not ...
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1answer
1k views

How to change input pin of FreqCounter Arduino Uno/Dumilanove library?

The following link to the library defines arduino pin 5 for input pin for signal. https://www.pjrc.com/teensy/td_libs_FreqCount.html But the problem is I'm using an 16x2 LCD display with the ...
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3answers
15k views

Sending a value from one arduino to another

I wonder if it is possible to send a value from one arduino to another. Basically, I have one arduino measuring let's say weight, but I want to display that value using an lcd in another arduino. ...
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1answer
114 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
48 views

D1 Robot… lights up but nothing

I have the Arduino shield described here, I have run the example code compiled to the device, both v1 and 1.1 example, and it shows nothing whatsoever on the screen. https://www.dfrobot.com/wiki/...
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0answers
35 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
46 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
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?
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1answer
50 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
38 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 ...
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2answers
5k views

Wire.h not found newliquidcrystal

The arduino IDE can't seem to find the wire.h file when i'm using the new liquid crystal library. Does anyone know how to solve this? here is the code i'm using and the error message: /*-----( Import ...
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1answer
47 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
91 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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2answers
1k views

MATLAB+Arduino+LCD

I am trying to send some integers to an LCD. But it is not working. I have tried in Proteus. Please help. I have uploaded MATLAB and Arduino code below. MATLAB code: clear all clc answer=1; % this ...
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1answer
38 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
1k views

Leonardo-based tachometer?

I'm new here. I'm not a native speaker, so pardon my English. I just received my Arduino Leonardo today. I tried some basic calculations and stuff like blinking and LCD interfacing. Its interesting. ...
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1answer
141 views

Arduino LCD Brightness

I've made this small device that uses a ultrasonic sensor to tell how far away an object is and display it on a 16x2 display. Here's the code: #include <LiquidCrystal.h> int Contrast=100; ...
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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 ...
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2answers
42 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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2answers
607 views

I2C conflict with 2 Arduinos

I am having some trouble connecting my 2 Arduino Nanos with I2C. I have this configuration: SLAVE RECEIVER Nano with DS1037 and LCD 16x02 on I2C. MASTER SENDER Nano. After some time the Slave ...
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1answer
41 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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3answers
1k views

Arduino board to control microwave oven?

So I've taken apart an old microwave oven with a touch-sensitive LCD screen. I understand that I could die from playing around with this, so I've disconnected the high-voltage transformer and the ...
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1answer
54 views

Why does attaching Nokia 5110 LCD make my otherwise fine MKR1000 disconnect USB after 15 secs?

This problem just started after 3 days of working on a project. I am using Arduino IDE in Windows 10. When I go to upload "Blink," everything works fine. I connect the USB (sometimes I have to ...
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2answers
1k views

How should I initialize a RepRap Discount 12864 on u8glib?

I was taking the advantage of an existing piece of hardware (RepRapDiscount Full Graphic Smart Controller) for my present project. Here is a link for the RepRap wiki about the controller #define ...
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2answers
691 views

Trying to print text on LCD display from Arduino trinket

I'm trying to simply program an Arduino trinket to display some text on an LCD display. I'm basically trying to follow this, except connect it to a Trinket rather than an Arduino Uno. The background ...
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2answers
354 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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1answer
607 views

How to read data directly from lcd display

Referring to post: LCD data read and show on computer It was not clear what the final code is. Could you post the code and schema again, and if possible, an explanation of how it works? My problem: ...
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1answer
56 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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2answers
826 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
1k views

Fingerprint sensor code won't work correctly with LCD 16x2

I am doing a fingerprint sensor that works with a 16x2 LCD. The code works correctly for the fingerprint sensor, but when I enter LCD code, the LCD works but the fingerprint stops working. I am using ...
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1answer
2k views

How to add toggle button for LCD display text and backlight?

I have set up a BMP180 and a DHT11 to display data on an HD44780 20x4 LCD. I want to be able to toggle the altitude from meters to feet, the temperature from Celsius to Fahrenheit, and the pressure ...
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1answer
111 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
56 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 ...
2
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2answers
362 views

Use interrupts with analog pins in arduino or another possible solution?

I have a very simple circuit, but my program is some what complicated. Here is the circuit diagram: Here is the code: /* 01 - GND -------- GND 02 - +5V -------- 5V 03 - V0 -------- ...