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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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Just saw this question in Arduino CC, and want to know if there is any good ideas? [on hold]

http://forum.arduino.cc/index.php?topic=590532.0 What I still lack for the above display would be something like ON / OFF or SLEEPIN / SLEEPOUT. The used controller ILI9341 should be able to do that....
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0answers
24 views

LCD 16,2 lighting but not displaying anything [closed]

When I hook up my LCD to the arduino it just lights a blue colour but nothing that is displayed. All connections are made according to the code below, could the problem be in the software or the ...
0
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1answer
26 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
36 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
42 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 ...
0
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2answers
34 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
29 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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18 views

Need help regarding not display of any chracters by LCD display JHD 162A

I have always found out the answers somewhere in this forum but now I feel disappointed and need your help regarding initialising JHD 162A display. My environment is Arduino UNO and JHD 162A display. ...
0
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1answer
36 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
61 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
44 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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0answers
25 views

How do I make changes in the existing library of Arduino?

I have to interface 16x2 LCD and that too with the help of Shift register 74hc164 IC. So I want to change on my LiquidCrystal library. How can I make changes in it. It is showing error: LiquidCrystal ...
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1answer
43 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 ...
0
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1answer
42 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
46 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
38 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
28 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
15 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 ...
0
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1answer
46 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
45 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
44 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 ...
0
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1answer
191 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
37 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
41 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
23 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
68 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
106 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
206 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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0answers
56 views

Refreshing LCD with different frequency than output

I have a problem, where I want to use a digital output of Arduino at range of 1kHz, but refresh the LCD with 1 Hz. I don't know how to refresh LCD slower, without effecting the frequency of output ...
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1answer
28 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&...
0
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1answer
41 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
79 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> ...
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1answer
120 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
45 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
84 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 ...
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1answer
949 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 ...
1
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1answer
398 views

Print output on 16x2 LCD and Serial Monitor

I'm trying to print an int on both an LCD and the Serial Monitor, but its only being displayed on the LCD. The Serial Monitor is printing question marks. Here is my Arduino code: #include <...
2
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1answer
102 views

LCD prints weird characters when I place the print statement in setup after pinMode statements

#include "LiquidCrystal.h" const int rs = 7, en = 6, d4 = 5, d5 = 4, d6 = 3, d7 = 2; LiquidCrystal lcd(rs, en, d4, d5, d6, d7) void setup() { Serial.begin(9600); lcd.begin(16, 2); pinMode(22, ...
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1answer
41 views

LCD display not working properly + inconsistent results

I have soldered the pins to my 20x4 LCD display. The soldering is not very good, but this is the best i can do. I have measured the resistance between each of the pins of the LCD with my multimeter to ...
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0answers
22 views

My 1604 LCD is bright with USB power but not when powered through the jack

I'm making a bench PSU. The Arduino runs off the purple 5v standby. The Mega also powers 2 LEDs (normal 5mm clear). The thing is, when I upload the code and watch the screen go through the process, it'...
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0answers
370 views

How to display a text or graphics without flicker on the TFT LCD

I'm building a new device with 1.44" TFT LCD and ATMEGA328. I'm using the Arduino library. There are several features like a logo, a button image, and a graph. But I have an issue when text or line ...
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1answer
42 views

Background “static” on side of TFT screen?

I recently bought an XC4629 128x128 TFT screen and noticed that failing to initialise a background for the screen produced this RBG static. A red line drawn on the screen without a background: The ...
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0answers
59 views

Why does I2C On Nano Fail with LiquidCrystal_I2C library unless Nano runs at 8Mhz?

I have an Arduino Nano (running by default at 16Mhz). I am connecting a 20x4 LCD screen via I2C (using A4 for SDA and A5 for SCL). Here's the very simple code (which was previously only showing black ...
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1answer
99 views

LiquidCrystal library and timers don't seem to be compatible

If I set timer2 to Compare Match mode, my LCD display stops working. If I use Overflow Interrupt it works fine. Here's my test code. I have a loop() function which does its thing, and a timer ...
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0answers
34 views

StepperLab3 library and Liquidcrystal

I want to control a stepper while displaying user menus on a freetronics style 16x2 LCD. I'm using liquidcrystal for my menus and in order to get non-blocking control of the stepper I've imported the ...
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0answers
61 views

Arduino with LCD i2c adapter (Error receiving data)

Good day! I'm currently working on a device with Arduino UNO, NFC/RFID Module v3, esp8266 and LCD with i2c adapter. The process is TAP card, read card data then send via wifi. Here's the scenario, ...
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2answers
38 views

String to equation problem

My project is to create a decimal adder via voice recognition. Its like a calculator that only does addition. I am using hc-06 bluetooth module to convert my voice to a string. Let's say for example, ...
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1answer
710 views

LCD display weird characters

Im a newbie. I have a problem with displaying text in LCD (16x2). It shows incorrect message in the lcd. Here is the code and the picture that gives the wrong output : Kindly help Thank you. #include ...
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0answers
571 views

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 ...