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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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181 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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840 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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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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38 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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239 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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230 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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231 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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431 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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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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296 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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404 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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155 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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196 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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99 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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453 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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55 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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155 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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329 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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384 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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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. ...
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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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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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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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371 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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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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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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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 ...
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50 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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56 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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226 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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112 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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46 views

Printing to an LCD

I am trying to get the code below which records to the rpm for a fan, to print to an LCD, specifically print the value of "Calc". This code uses a number of interrupts which I do not fully understand. ...
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55 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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33 views

Is there a way to fix my 16x2 Arduino LCD that shows weird stuff?

I am new to Arduino. I was trying to make an arduino LCD say "hello world". It worked with low brightness. So I switched the 5 volt and ground wires to 9 volt and ground. Now it displays lots of ...
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796 views

Ultrasonic sensor showing 0 cm

I'm new to Arduino. I am making a project using an ultrasonic sensor with LCD. But the output I am getting is 0cm. Here is my code. Please help me with that. Thanks. /* HC-SR04 Ultrasonic Sensor with ...
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148 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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77 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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218 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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58 views

LCD Display issue with PCD 8544

I have been scratching my head since couple of days to solve a lcd display issue. Problem-1: As I read from the datasheet of PCD8544, I can set x, y position to (0, 0) by writing command 0x80 and ...
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60 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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71 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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167 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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330 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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533 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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1k views

Character won't show up on LCD display

When tried to hookup an LCD to arduino mega using the following 2 sketches. Even though no characters show up on display. #include "U8glib.h" U8GLIB_ST7920_128X64_4X u8g(10); // setup u8g object, ...