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Questions tagged [display]

A visual output device typically capable of displaying text and/or graphics. Can include various technologies, such as LCD, OLED, and TFT.

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9
votes
2answers
20k views

How to use a common anode 7-segment, 4-digit display?

Please take this question as an example to (my own) answer below. I've got an 7 segment, 4 digit LED display, but I don't have any idea on how to wire it. I don't understand the difference between ...
8
votes
1answer
2k views

7 segment LEDs on wood face

I'm not sure this is right place for this question, but does anyone have any idea how a 7 segment display is projected or embedded in wood for products like this? Full product info at http://www....
7
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4answers
1k views

What design patterns can I use to handle user input and display updating?

I've used enough products with embedded microcontrollers and unresponsive UIs to know that it can make or break a product. Even a slight delay or lag between the button presses and the display ...
6
votes
3answers
10k views

How to show the º character in a LCD?

I have a 16x2 LCD and I want to show a temperature: 23 ºC. But the º symbol is not properly shown. It shows a strange character instead of the º symbol .
6
votes
1answer
193 views

RePaper 2.7" eInk Display with Arduino Due

I got a RePaper 2.7' eInk display that unfortunately doesn't support Arduino Mega because of its limited SRAM capacity (8k bytes). I am porting the library to Arduino Due because of its sufficient RAM ...
5
votes
4answers
3k views

Save some arduino pins when driving a 4 digits 7 segments display

I built a simple clock using a 4 digits 7 segments LCD display. I display one digit at a time, switching on and off very quicky and cycling through digits. Everything is ok, but I used 8 + 4 = 12 ...
4
votes
2answers
524 views

Image Breakdown

I've been trying to figure out a way to store an image on the Arduino, and I couldn't figure it out. What I've been trying to do with this image is the following: Test that the arduino has the image ...
4
votes
2answers
257 views

OLED display crashes when connecting USB

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, but just if the USB isn't connected and it is powered by a 9V ...
3
votes
2answers
954 views

Need help with 2X3 matrix for braille

I'm an intermediate Arduino progammer, and I'm making an electronic braille display for my friend. You can think of this display as an array of 28x3 LEDs(one braille character contains a maximum of ...
3
votes
2answers
30k views

How to display variables on 0.96" OLED with u8glib library?

I have Arduino Uno and 0.96" I2C Oled 4 Pinned display. These are my Arduino codes: #include "U8glib.h" U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE); // VDD=5V SCL=A5 SDA=A4 int a = 10; void ...
3
votes
2answers
896 views

Driving single-character alphanumeric (16-segment) displays

I would like to drive three sixteen-segment displays (https://www.sparkfun.com/products/retired/9934) using an Arduino Micro. These displays would output an alphabetic character that a user would ...
3
votes
1answer
211 views

8-segmet LED's on Adafruit Trinket

I would like to have an array of eight 7- and 8-segment LED numerical displays on my Adafruit Trinket. I know that there are some prebuilt arrays of 4 LED's. So 2 in array would do just fine. However, ...
3
votes
2answers
1k views

Cannot move TM1637 from Uno to Pro Mini

I have a very simple setup which works fine with an Uno. #include <SevenSegmentTM1637.h> #include <SevenSegmentExtended.h> const byte PIN_CLK = 2; const byte PIN_DIO = 3; ...
3
votes
4answers
21k views

3.5" TFT LCD Display is not working with Arduino Mega 2560 R3

Even I can't do similarly with my 2.4" TFT LCD in here still: 2.4" TFT LCD Shield isn't working on Arduino Mega Now, I have bought 3.5" TFT LCD display for my Arduino Mega 2560 R3 to try ...
2
votes
4answers
14k views

How to wire up 4-digit 7-segment display?

I have an Arduino Mega and the CL5642BH, a 4-digit 7-segment display. I found very helpful code here, but I don't understand how to wire it up on the breadboard. The display has 12 pins: 6 on the top ...
2
votes
2answers
483 views

Using more than 8 digits using the sevseg library

I am using sevseg and i can't get more than 8 digits to work. I really need 15. Does somebody know what I can do to get this? Shown is the original example This is using Gabriel Staples example in ...
2
votes
3answers
551 views

ILI9163C screen not working properly

I've just tried out my new TFT_ILI9163C display with TFT_ILI9163C library but I'm having an issue with it. The graphics has moved down (the "hello world" should be in the top left) and the leftover ...
2
votes
2answers
2k views

Is it possible to read VGA with an arduino

In this forum thread on arduino.cc http://forum.arduino.cc/index.php?topic=107375.0 they talk about it not being possible to get 800 x 600 video in color with the arduino. My case is a bit different: ...
2
votes
4answers
2k views

Reading a 10 pin 7 segment (2 digits) sing Arduino 1. Please Help!

thanks for taking the time to read this, I really appreciate it. I am very new to Arduino and the Micro controller world so please forgive my ignorance. So I have an old 7 segment display that ...
2
votes
2answers
170 views

Looking for a game application oriented display for Arduino Mega

I was using displays with serial communication (SPI), but sending bytes to draw a tile-based picture was way too slow so I'd like find one with a parallel port, enough fast bandwidth to receive fast ...
2
votes
1answer
576 views

Are there any commonly available and supported backlit, monochrome graphic LCDs with more than 128x64 pixels?

I am currently using a ST7565 graphic LCD for display in a heat pump system. This LCD has the following characteristics: 128x64 pixels 2.5"x1.5" monochrome, no greyscale backlit good viewing angles ...
2
votes
1answer
566 views

I need help with U8GLIB library

I have a project which uses a 128x64 oled display. I have to use the U8GLIB as the available displays change from SSD1306 to SSH1106 depending on when you buy it which that library covers both ...
2
votes
1answer
924 views

Yet another display 16x2 not working with arduino

I found hundreds of questions about display not working with arduino. However, no matter how trivial this looks like I am having the same problem I cannot understand by reading the other posts. I ...
2
votes
1answer
68 views

Why Liquid crystal display doesn't give output in code below?

I've been working on project for children showing the codes used by atc transponder. I've used a keypad and a 16×2 display , where user types a 4 digit code and display shows condition related to the ...
1
vote
2answers
787 views

How to concatenate strings

I am new to the Arduino platform so please bear with me. I have a program to display rolling text on a LED matrix which is for the Tinyduino platform #include "Charliplexing.h" #include "Font.h" #...
1
vote
2answers
1k views

Arduino freezing with OLED display

I have a 0.96" OLED display hooked up to my Arduino Mega via SPI. I installed the Adafruit library and GFX library. I can run through the little graphical demo from Adafruit just fine as well as ...
1
vote
4answers
5k views

Can't get 4 digit 7 segment display to show different values

I'm an Arduino newbie having problems getting a 4 digit 7 segment display to work. The display is connected to a 74HC595 and the setup is from the elegoo tutorial 28 (I think it is download only). I ...
1
vote
3answers
276 views

One free pin. Need to display output for the user?

I'm working with lightblue bean. I have a device that writes data to an SD card on a long button press and switches what will be written (from a list of 5 items) on short button press. The output, ...
1
vote
3answers
96 views

Solutions for displays?

I am trying to find cheap options for displays about 3 x 6 inches to display time, weather, simple clip-art type images, and other marquee messages. What are my best options to work with arduino if ...
1
vote
1answer
257 views

How to catch the Enter key received by Bluetooth?

I got some code to receive characters from Bluetooth and code and print it back to the LCD display. However, want to detect the Enter character to be the input signal, in other words, not to print ...
1
vote
3answers
885 views

Wemos: 16x2 display doesn't show anything

I connected a 16x2 LCD display to a Arduino Uno. Then I tested a "Hello, Word" code and it works perfect. Now I want to do the same with a Wemos D1 Mini but it doesn't work. Here the Wemos is not ...
1
vote
4answers
3k views

Running a 7 pin OLED with 4 pins (I2C)

I have an OLED with this 7 pin pinout: I want to use an existing code i found that makes use of U8Glib. But in the example, use uses 4 pins to control the OLED via I2C. This is the pinout he uses: ...
1
vote
1answer
2k views

7-segment display code

What is the meaning of BitSet = bitRead(numeral[number], segment);? const byte numeral[10] = { //ABCDEFG /dp B11111100, // 0 B01100000, // 1 B11011010, // 2 B11110010, // 3 B01100110, ...
1
vote
2answers
7k views

10k ohm Potentiometer vs 10k ohm Resistor on LCD Display

I'm trying to use a LCD Display with my Arduino, but I don't have a potentiometer and all of the guides I find always require one, usually a 10k ohm potentiometer. The point is that I'm not very good ...
1
vote
1answer
157 views

16 X 2 LCD display blank with Arduino Uno

So I am following this tutorial to make my arduino display hello world and millis(), I got it to work for a minute, but then it stopped updating the milliseconds, and when I pushed the reset button it ...
1
vote
1answer
1k views

SSD1306 allocation failed when adding a constant

I am trying to get this code working: #include <Button.h> #include <SPI.h> #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <RTClib....
1
vote
2answers
103 views

Less hardware dependent development?

I'm working on a little Arduino game project that uses neopixel strips as a display. Uploading every code change to the Arduino and testing it on the LEDs is slow and drains hardware lifetime. ...
1
vote
2answers
1k views

Adafruit 128x64 OLED not turning on

I ordered a 128x64 pixel OLED display from Adafruit and wired it according to their guide. (To an Arduino Uno) I'm using SPI right now and the display will not turn on or do anything. I haven't tried ...
1
vote
2answers
758 views

for loop iterated only once

I have written a little project, it works so far as it should but the for loop is only iterated once, then the result is displayed on the LCD. #include <LiquidCrystal.h> #include <stdlib.h&...
1
vote
1answer
343 views

Two data outputs to be displayed on one 16x1 lcd display

Before pursuing this very far, I would like to know if I can get two different data outputs (one on the left 8 and the other data on the right 8). And if so, are there any requirements on the display ...
1
vote
2answers
559 views

7 segment display blinking

I want to display the DHT22 temperature and humidity sensor in a 3 digit 7 segments display. It's always showing the sensor value and after 2 or 3 sec the display turns off, and then the display ...
1
vote
1answer
47 views

Can I call functions from a different sketch? [closed]

I am a beginner at programming with Arduino and I am unsure on how can I call functions (such as, getData()) for the touchscreen LCD to display that data. The purpose of my device would be to listen ...
1
vote
1answer
292 views

7-Segment, 3-digit display not displaying correctly

I have written the code that should work, but for some reason the numbers do not display correctly. When I choose to display 3 times the same number it works correctly (so pin connections are correct) ...
1
vote
2answers
487 views

How can I declare global array with its length stored in EEPROM?

I am working with Arduino UNO connected with BV4612 display. I am working on a simple code that controls several water pumps. Each pump has several modes it can run in. I store these modes in an array....
1
vote
1answer
241 views

OLED on Hardware SPI, on DUE

I want to use an OLED with DUE. I plan to connect it via hardware SPI. The Due has a 3X2 pin connector labeled SPI. Is it here where i connect the SCK and MOSI? If indeed, i connect it here, then ...
1
vote
1answer
50 views

HD44780 Extended non-display DDRAM?

According to page 10 of this PDF https://www.sparkfun.com/datasheets/LCD/HD44780.pdf The HD44780 has enough DDRAM to operate an 80 character display. A 16x2 display has 32 characters meaning we have ...
1
vote
2answers
485 views

7 segment displays arduino mega 2560

I'm trying to use an Arduino Mega 2560 to use 7-segment displays, 6 displays... I use 3 CD4543B to pilot the 6 displays. It works very well for 4 displays as you can see in this video. But when I ...
1
vote
2answers
456 views

Writing a custom character on an lcd

I am using a 16*2 lcd display as a dashboard computer. I want it to display a logo at the very beginning of the code, but some letters occupy the space of 4 characters, and are using both lines of ...
1
vote
2answers
1k views

Loop inside switch statement

I am using voice command to start/stop display of LDR readings over Arduino. The module I am using is voice module V3. I have downloaded some of its examples. First we need to train the module with ...
1
vote
1answer
35 views

Need to turn on project twice in order for screen to work!

This problem is really stumping me. I made a simple printed circuit board with an ATtiny85, a 128x64 I2C OLED display, and a Sharp IR analog distance sensor. You can view the circuit here: circuits.io....