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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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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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0answers
25 views

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
25 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
953 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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2answers
928 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
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 ...
0
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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
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;...
4
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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. ...
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
503 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
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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2answers
566 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 ...
0
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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 ...
2
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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 ...
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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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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0answers
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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2answers
662 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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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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2answers
321 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
193 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: ...
0
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1answer
45 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 ...
0
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2answers
688 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 ...
2
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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
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 ...
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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 ...
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 ...
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2answers
330 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 -------- ...
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4answers
1k views

16*2 1602A LCD not displaying any character or contrast, although correct wiring

I've used my LCD display with a lot of small projects. Now it doesn't work anymore. Most of the diagrams you find online use resistors and potentiometers. However I never done that, but still got it ...
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4answers
574 views

Determining contrast on LCD

So I am using this code here and I do get text written on my LCD screen. Problem is that text is almost invisible. I tried with background light on or off and it did not help. LCD is connected to 5v ...
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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 ...
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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
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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1answer
182 views

When the TX and RX pins for Bluetooth are connected the LCD screen will not update. Why is that?

I have connected a Bluetooth shield and LCD screen to an Arduino Uno. I have two active low push buttons to increase or decrease the variable desiredTemp. This value is meant to be displayed on the ...
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1answer
9k views

NodeMCU with RFID RC522 and I2C interface LCD module together

I'm newbie in Arduino programming so I hope to get a clear answer. I have NodeMCU v1 12-E, I connected it with RFID RC522 as in attachment picture. Now my question: I need to connect I2C interface ...
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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
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 ...
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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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 ...
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3answers
6k views

I2C LCD displaying weird characters

I have connected an LCD with an I2C backpack to my Arduino Uno but it prints the wrong characters. The weird thing is that it worked fine for a while and when I updated the code (but didn't change ...
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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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3answers
6k views

I keep on getting a stray '\302' in program error.How do I fix it.This is in arduino uno

#include <LiquidCrystal.h> int trigPin = 13; //sensor's trigger pin connected to pin 13 int echoPin = 7; //sensor's echo pin connected to pin 11 float pingTime; //time for the ping to hit ...
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3answers
5k views

What is the point of D0-D3 on LCD?

The Arduino LiquidCrystal library has 4 constructors with different arguments: LiquidCrystal(rs, enable, d4, d5, d6, d7) LiquidCrystal(rs, rw, enable, d4, d5, d6, d7) LiquidCrystal(rs, enable, d0, ...
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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 ...
6
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2answers
1k views

16x2 LCD showing blocks under text

I have a LCD connected to a Arduino Mega 2560 using the instructions in LiquidCrystal library. It is not the first time I am using a 16x2 LCD but I never have encountered a problem like this. When I ...
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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 ...
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1answer
498 views

20x4 LCD will write but then won't update

I am controlling a solar tracker, and it needs to be reset every 10 minutes or it loses its mind. My program works fine, controlling power relays, so I have added I2C&Power to be able to see the ...