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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Serial does not work when LiquidCrystal library is used

I have been struggling with a LCD for 6 hours straight - I've had many problems including random characters showing up, and this time (not quite sure what changed, I tried so many things) as soon as I ...
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191 views

Why does avrdude error appear when interfacing GLCD with arduino uno in ubuntu

I want to interface a GLCD with arduino uno. The GLCD is JHD12864E. The connections are as shown in this image I downloaded the OpenGLCD library and uploaded HelloWorld program from it. I got ...
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902 views

3.5 inch TFT LCD connection diagram with mega r3

Forum post I would like to ask if someone has this shield fully working. My biggest problem is the touch screen that i couldn't manage to make it work. Here is the code i am using: // ic: ili9327 ...
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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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Why is my keypad requiring a double-click only on the first row to register?

I have a keypad that is connected to my Arduino and each time a key is pressed, the number should be outputted to an LCD screen. The issue is that after the screen is cleared, and a new ID is being ...
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282 views

How to read the busy flag on LCD?

I have a standard 16x2 LCD screen and I have it hooked up to my Arduino UNO via a I2C backpack (4-bit mode). Since I want to learn about the lcd at a lower level I’ve decided not to use the LCD ...
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263 views

Wiring Feather Huzzah ESP8266 to Monochrome 1.3" 128x64 LCD

I'm new to Arduino and the pinouts for the Adafruit 938 LCD doesn't seem to match the pinouts that I looked up for the Huzzah ESP8266. Does anyone know the proper pinout for this display and the ...
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How do I display serial monitor on LCD keypad shield?

I want to be able to display what I am seeing on the serial monitor onto the LCD keypad shield I have connected to my Arduino UNO. Can someone possibly write the the code ontop of this for me? I'm ...
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324 views

Compiling Error 3 Wire LCD

When this 3 wire LCD code is compiled the following message results: NewLiquidCrystal-master\I2CIO.cpp:35:26: fatal error: ../Wire/Wire.h: No such file or directory #include <../Wire/Wire.h> ...
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467 views

Arduino Nano - 5V pin drops to 3.3V when load is connected

I have a Nano (with ATmega328) board that I am using along with a GPS module, an LCD and a potentiometer to make a small GPS unit that will tell the location. Long story short, when powered externally ...
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204 views

Arduino LCD changing contrast only makes black boxes less readable i.e. less in contrast

I have seen similar issues posted here but none match my problem exactly. I have a starter kit and a 16x2 LCD screen that only shows black boxes in the top row using the following code: #include <...
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220 views

Arduino ethernet shield error

As I mention in the title, that when I am trying to upload the code of WebServer to the Ethernet Shield it shows me an error messages. Please if any one can help me to fix it, and here is the ...
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1k views

Arduino is freezing after 10-15 minutes

I am having a problem with my Arduino freezing after a small amount of time. I'm using an RTC DS1307 breakout to keep track of the time and display the time on an LCD. It displays hours, minutes and ...
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105 views

Unable to determine why the LCD shield does not initialize

I have an Arduino UNO and a 16x2 LCD Shield that have been lying unused for one year, or perhaps more. Yesterday I connected the Arduino via USB, uploaded a couple of simple sketches, played around ...
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481 views

Merging two codes, one for speaker one for LCD clock (Arduino Uno)

I have two different codes. The first one makes a LCD screen count the time and print it, then when one of the buttons on the LCD shield itself is pressed, it prints the time on the top line that it ...
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1k views

iPhone 3g Screen with Arduino Uno

Probably a simple question, but my Googling has been fruitless so far, but would it be possible to use the LCD from an old iPhone 3g as a display in an Arduino Uno? I don't need the touch digitizer to ...
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arduino leonardo stops transmitting once hdmi cable is connected to a screen

I am using arduino leonardo for moving mouse pointer with head tracking using MPU6050. It works fine in general. But as soon as I connect an external lcd screen to my laptop via hdmi cable, it stops ...
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188 views

How do I connect a micro display to an Arduino?

I have a micro display that I bought for a project and to my knowledge there is no driver(?). Would I need some component to be able to control the LCD? Which would it be? Specifications Datasheet
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159 views

Arduino Robot - LCD display blank

I'm currently playing around with an Arduino Robot, and can't seem to get the LCD display it came with to work. I am using code that I found here I did, however, have to get rid of the 4th parameter ...
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337 views

Can't get LCD(1602A v2) to communicate with AVR ATMEGA2560

I have written the following code to communicate with an LCD display yet I can not get data to appear on the screen. All I get is white boxes on the display. I am properly controlling the RW, RS and ...
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419 views

Connect Lilypad to LCD

I am trying to connect an LCD panel (RioRand (TM) IIC/I2C/TWI Serial 2004 20x4 LCD Module Shield For Arduino UNO MEGA R30) to a Lilypad Arduino. How can I get them to talk to each other? I cannot ...
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19 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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21 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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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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30 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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24 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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22 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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28 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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84 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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86 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 ...
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42 views

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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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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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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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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40 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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51 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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107 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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59 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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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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24 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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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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963 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 ...
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62 views

How to connect to LCD and communicate via serial usb simultaneously? (UNO)

Pretty simple home automation project I am working on. I'm trying to hook my arduino which has a 16x2 LCD, DHT22 temp/humidity sensor to my Pi via usb. I want to be able to maintain the values on the ...
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How to interface LCD?

I brought an ATmega328p chip today, which I bootloaded later on and I tried some basic circuit examples (like blink LED) with the chip (Minimizing the circuitry) and it worked perfectly fine. When I ...
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263 views

concurrent display of BMP file and text on Arduino TFT LCD screen

I am using an Arduino TFT LCD screen (1.7'') on Arduino Due for displaying .bmp file of 80X60 pixels. Is it possible to display a .bmp image on the lcd screen and also display text/draw an object such ...
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206 views

Stuck at initializing input capture

I am using MEGA 2560 with 1.8inch TFT screen. I am trying to use input capture (shown in the code below) feature along with TFT display (1.8inch TFT display). Now when I individually test the input ...
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261 views

Restarting Arduino changes cursor position on OLED

I got an 16x2 OLED Display (DEP 16201-Y , compatible to the HD44780 controller) for my Arduino Uno and I got it to work in 4-bit Mode. Code: #include <LiquidCrystal.h> LiquidCrystal lcd(13, 12,...
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67 views

my button won't work, why?

I have been trying to get the button to work properly for over a day, but it just won't, can you help me. The lcd display is for another part of this project, not important at the moment, but I can't ...
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177 views

Weird probled with TFT LCD screen and DHT22 sensor

I'm doing a research project that uses three sensors (DHT22, HTU21D and TMP102) and two screens (a normal 16x2 LCD, and a TFT). I connected all the sensors and the LCD in my Arduino Uno and ...
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364 views

white screen : 2.8" TFT LCD Screen Module: HY-280TFT

i have a problem with my new 2.8" TFT LCD Screen Module HY-280TFT.i connect it with an Arduino Uno board like this way: Connect HY-TFT280 to Arduino UNO LEDA -> 5V LEDK -> GND VCC -> 5V RD -> 3.3V ...