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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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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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0answers
188 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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0answers
867 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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80 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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0answers
40 views

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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260 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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276 views

Dimensions for Adafruit RGB 16x2 Character LCD + Keypad Shield Cover

I'm looking to make a cover for the Adafruit lcd-shield: However, there are some dimensions missing from the provided pictures (namely the horizontal location of the various buttons) Does anyone ...
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244 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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476 views

LCDs interfere with Adafruit datalogger SD card function

I am using the Adafruit datalogger shield (Rev B) and a pair of cheap 20x4 LCD I2C displays. The displays have a small I2C I/O expansion module board on the back. The LCDs I am using are these; ...
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0answers
1k views

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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313 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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426 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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0answers
180 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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0answers
208 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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0answers
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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0answers
102 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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463 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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0answers
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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56 views

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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187 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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158 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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335 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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407 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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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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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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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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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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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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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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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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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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35 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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793 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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59 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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0answers
62 views

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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251 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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140 views

Problems with ST7735

I have this Arduino display that looks very similar to an ST7735 SPI display. I found out that this is the pinout by testing the VCC, Ground and LED pins, but it is not the same one, it is supposed ...
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60 views

What variable name does each button have on the LCD Keypad Shield?

I just bought the LCD keypad shield and wanted to have a cursor go to the left and right when you press the left or right button. But then the problem arose that i didn't know what variable name the ...
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177 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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88 views

Arduino - Reading the LCD TFT RAM

Good day everyone. I'm creating an Arduino program and I would like to read the LCD TFT RAM. The idea is to be able to read the LCD's RAM, do some processing, and execute code based on what we read. ...
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0answers
240 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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64 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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76 views

Is this a good way to read from LCD1602 with TW? And how to start first char in first spot in the LCD1602?

OK, I did most operations with LCD1602, I just now want to read from the LCD either a command or data. I'm thinking now that it's connected with the DDRAM addresses and I have to develop a for loop ...
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171 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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0answers
349 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 ...
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584 views

rc522 RFID reader will only accept first tag after power up

I have an interesting problem using the Mifare rc522 device similar to http://www.ebay.com/itm/201415107836 I have this device connected to an arduino uno and drawing power from the 5V supply. It ...
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0answers
1k views

Using a TFT LCD with an ESP32 Thing

So I've got an ESP32 Thing from SparkFun (https://www.sparkfun.com/products/13907) here, and for the life of me I can't figure out how to use my TFT LCD with it. I was hoping to make a desk clock or ...
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66 views

Output to LCD is sometimes shifted to the side

I have an Arduino Uno connected to a LCD. When I try to write to it using the LCD library and the following sketch, it will keep shifting the output around, sometimes drastically. The sketch: #...