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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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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
29 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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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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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
54 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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33 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
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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21 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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0answers
39 views

LCD display not working

I am trying to read from a temperature sensor and write those values on a SD card. I am currently able to write it into a log file and display it on serial monitor. I have initialised the LCD, but ...
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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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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
45 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
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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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 ...
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
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
110 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
128 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
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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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 ...
0
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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, ...
0
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1answer
55 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
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 ...
0
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1answer
55 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, ...
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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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1answer
34 views

Are hardware interrupts used while controlling an LCD screen using the LiquidCrystal library?

I'm working on a tone generator project that uses Mozzi to make sound (sine waves mainly). As I understand, Mozzi can glitch if used along with hardware interrupts. The plan is to use the classic ...
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0answers
21 views

Arduino lcd game problems, endless runner code not working

i have a game i have downloaded and built, have a file here, (file is too large to put on here), i am posting the whole thing because i dot know why the code wont work. that file is the original (from ...
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1answer
138 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
31 views

How to create objects with their own variables? [closed]

So i created a class and when i created objects and use them, they seem to share their variables between each other ( the currentReading, previousReading and the time variable). how can i create ...
0
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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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1answer
51 views

LDC paired with Arduino locks up and freezes. Out of SPRAM?

I am making an alarm clock using a 4x20 lcd display, rtc, and Arduino Pro Mini 3.3v. I have implemented a menu system for setting the time/date that blinks the text on the lcd display to indicate that ...
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1answer
597 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
39 views

My brand new LCD screen doesn't display anything, even though there is no code errors?

I have a LCD screen, and I wanted to use it with a Simon Says game that I am making. I tried the tutorial on the Arduino website, but it doesn't work. Then I tried another tutorial on Adafruit. On ...
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2answers
69 views

Arduino Force sensitive Resistor with an lcd

So we were asked to do something with a force sensitive resistor so naturally i thought of a project which takes the name of the main component which is force and applies it ,mine works by as you ...
0
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1answer
26 views

LCD Identification FPC-JG00467-01B SR36 [closed]

I salvaged an old LCD from a calculator (Texas Instruments) and I want to interface it with a microcontroller (preferably an Arduino). I‘ve searched the whole internet but I simply can‘t find any ...
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1answer
98 views

How to connect 2 Arduino Unos when one has a TFT LCD display attached to it? [duplicate]

I have to make a school project involving an Arduino Uno with a 2.8" TFT LCD touch screen display. in my project, i have to connect it such that the display is linked to a LED push button that receive ...
0
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3answers
133 views

Using delay(1000); without influence on analogWrite?

So, I'm trying to read the voltage on analog pin A0 and make a "regulation", where if the voltage will be lower than 2.5V (analog value 512), then it should be output pin 9 used as PWM with duty cycle ...
0
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1answer
341 views

Using Waveshare Raspberry Pi TFT LCD with Arduino Uno

I have a 3.5 inch Waveshare Raspberry Pi TFT LCD which uses the XPT2046 Touch Controller. I want to use this LCD screen with my Arduino Uno. I originally believed something like this was impossible, ...
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1answer
30 views

How to Create a reference to an External Print object

Right now I have an object: class Dog { public: Dog(uint8_t I2c, Stream& feedback); void Speak(); private: uint8_t _I2c; Stream& _output; }; Dog::Dog(uint8_t I2c, Stream&...
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1answer
81 views

Stabilitiy Problem for Interrupts Code related to Flow sensor

There is a problem with code related in link Interrupts Problem with Flow sensor. Code is working but when I stop the pumps, flow value on lcd is frozen until I reset the arduino. And when I start the ...
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1answer
125 views

Extra “zero” displayed on LCD when integer sent from PC to Arduino through serial port

Every time I send an integer from computer to Arduino an extra zero is displayed on the LCD connected to Arduino. I don't know the reason. Why? Here is the code: #include <LiquidCrystal.h> ...
0
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1answer
162 views

Reading text from sd card is returning weird characters?

I have an ebook which is converted to a .txt file saved on an sd card which is connected to the arduino. I'm trying to display the words from the book on a 16x2 lcd display on word at a time. It works ...
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2answers
55 views

Writing to serial LCD seems to interfere with servos

I have an OBD-based Arduino project (OBD adapter link below) which uses two servos and a serial LCD from Sparkfun (link below). My problem: writing to the LCD seems to interfere with the servos. ...
3
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2answers
109 views

Resistors on LCD - does a small difference matter?

I recently have tried to connect an LCD to my Arduino Uno. The tutorial tells me I need a 220 Ohm resistor, but the only ones I have are 330 Ohm. Does it matter? Here's the Fritzing diagram by the ...