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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88 views

Arduino IDE Test-Sketch for 7,5" E-Paper not working

I have a LOLIN32 and want to connect it to a 7,5" Waveshare E-Paper. I select the GxEPD_SPI_TextExample and select the display class and then upload it. I do not get any errors, but the display simply ...
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506 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....
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829 views

SSD1306 - Is there a way to scroll a certain number of pixels only?

For a hobby project, I am trying to make some sort of little game with an ATtiny85 and an SSD1306 OLED display, mostly to see how much I can do with the least hardware possible. Something like Captain ...
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151 views

SH1106 - Transferring long buffer via SPI

I am using an SH1106 and am creating my own driver for it. Nearly everything is doing great with about 2/3ms send time using transfer16. I did notice however that I can use transfer with a buffer and ...
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1answer
453 views

Reading RAM from SH1106 OLED Controller through I2C

Summary: I'm having trouble with writing a program to get RAM data from an SH1106 OLED controller via i2c. In the first part of the question I've written the assumptions I've made to get informations ...
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1answer
606 views

Problem to display Ntp time on an oled using U8G2 lib

So I have this code to get ntp time and display it on serial port. But I want to display it on a 1.30 inch I2C oled with a SH1106 controller using the U8G2 library. The only problem is I don't know ...
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1answer
279 views

SD begin affecting OLED display

Okay, I'm using u8g2 library for my OLED display. After calling SD.begin(4) function, I cannot display anything on my OLED. I'm using U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ ...
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4k views

SSD1306 / U8glib display fonts and commands

I cannot seem to find any reference for the SSD 1306 or U8glib display font library or any command reference, like all the options for display() etc. For my fonts I been going into the utility folder ...
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3answers
908 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 ...
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1answer
40 views

Drive graphics on iphone using headphone jack [closed]

I want to have user controlled animated cartoon eyes on a puppet that I have been commissioned to build. Can I use an Arduino to drive graphics via the headphone jack on an iPhone or Android? I am a ...
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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. ...
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Adafruit FT6206 controller won't start after unrelated code changes

I am using an Adafruit HUZZAH32 Feather with the ESP WROOM32 module and an Adafruit 2,8" cap touch Display. When trying my code I encountered a strange problem: one specific line of code lets the ...
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2answers
2k 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 ...
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1answer
554 views

MAX7219 library that can compensate for poorly designed/miswired 8x32 panel?

I have this sample code: #include <MD_Parola.h> #include <MD_MAX72xx.h> #include <SPI.h> #define MAX_DEVICES 4 #define CLK_PIN 11 #define DATA_PIN 12 #define CS_PIN 10 ...
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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 .
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1answer
321 views

Trying to connect a 1.3" IIC OLED display to an Arduino M0 board (not Uno)

I'm trying to connect an OLED display to the Arduino M0. I got the code example (ssd1306_128x64_i2c) from the Adafruit SSD1306 library I downloaded. Video showing at 8:14 how it should look However, ...
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2k views

Confused between SPI and I2C for SSD1306 OLED

I recently got myself an SSD1306 OLED display: I haven't been able to successfully wire it to an Arduino (Mega 2560) however. I have been reading up on I2C and SPI and checked some libraries from ...
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1answer
739 views

Using Multiple 4 Digit displays with the same pins

I currently have a ton of 4 Digit 7 Segmented displays(TOFD-5465GGH-B). The display is driven by a PT6961 LED Driver. Using a Library that I found here I was able to use the display with no issues. ...
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58 views

Arduino Pong game Circuit Board Troubleshoot

I am following a tutorial online to make a pong game. I have managed to make quiet a lot work apart from my paddles in the game keep on shaking. The buttons do work fine, up and down on both ends. ...
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1answer
844 views

MAX7219 7-segment 8-digit display in wrong order

I have daisy-chained three MAX7219 7-segment 8-digit displays and wired it according to this diagram: but no matter what library I use, the middle segment is in the wrong order when I display it. So ...
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1answer
810 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
772 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&...
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571 views

mcufriend SPI connection

Bought a cheap LCD form china (mcufriend, pictured below) and I cant understand which pin is which to use it with the SPI interface (starting to get worried that I can't use it), I've figured out this ...
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1answer
349 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 ...
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1answer
245 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 ...
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161 views

Atmega328p screen + midi, possible?

I'm trying to build this Midi2CV (control voltage for analog synths) using a Arduino Nano: https://photos.app.goo.gl/3IhhFL3PrLELLODB3 I was hoping to use this Nokia screen too for settings and ...
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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 ...
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1answer
973 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 ...
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2answers
31 views

Powering via an I/O Line

I have an SPI 128x64 OLED display. Is it safe to power this display's VCC from a digital I/O pin? I would like to do this so I can connect it flush to my arduino's header, and so I can control the ...
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1answer
805 views

Connecting E-paper display (GD) to Arduino?

I'm still learning how to use Arduino and electrical components, but I will try my best to understand any answers! So I just bought an e-paper display off a website, not from the manufacturer itself (...
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33 views

Tap into display signal

(Newbie Arduino developer). I am interested to read the signal being sent to a small flat screen display in an industrial appliance, while not disturbing the display. The goal is to capture ...
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2answers
260 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 ...
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0answers
296 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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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: ...
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1answer
81 views

Drawing specific RGB on touch screen

I have the Arduino MEGA and an adafruit touch screen 2.8 inches. My goal is to draw a pixel given a specific RGB I am using the ILI9341, GFX, and TFT.h libraries to draw and control the touch screen....
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1answer
671 views

Arduino uno and 1602A I2C not working

I'm a newbie in engineering. I bought this with arduino learning kit. It's simply not working. There are several possible problems: The display is not working due to a hardware problem. It could ...
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1answer
80 views

2.8 Touchscreen does not work with Proto Screw Shield

I am using the Arduino Mega and the 2.8 touch screen by Adafruit, and I can't get the screen to work on my Proto R3 Screw Shield Here are the tools I am using: 2.8 inch touch screen Proto R3 Screw ...
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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 ...
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1answer
87 views

Don't Print After decimal point in

In my code, I have float Hz = 0.00; I want to display values to my user in RPM as Serial.print("Speed = "); Serial.print(round(Hz*60); Serial.println(" RPM); The only hangup is that this displays ...
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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 ...
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2answers
539 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 ...
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1answer
696 views

Something's wrong with my code for a 4 digit 7 segment clock display

I'm trying to do a clock using 4x7 segment displays but once I run the code the Display doesn't turn on here's my Code that I'm like 90% sure that there's nothing wrong with it bool A = 2; bool B = ...
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2answers
490 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 ...
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2answers
501 views

7 Segments display with arduino mega2560

I doing a small project with 6 display 7 segment (I will call A1, A2, A3, A4, A5, A6) and 3 cd4543B (I will call Da, Db, Dc) with an arduino mega 2560. I also use 6 transistor to control power supply ...
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1answer
181 views

Multiplex 7 segment during delay (external IC?)

I am using some sensors with the arduino which take a second to receive the data from them. My guess is that there is a delay used somewhere in the library. During this time the multiplexed displays ...
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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 ...
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2answers
460 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 ...
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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 ...
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1answer
340 views

Bluetooth serial readings on 0.96'' Adafruit OLED

I am trying to display the readings of LDR connected to slave arduino through serial monitor of master arduino paired with bluetooth. I got the readings and it is working fine. But when I connected ...
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1answer
865 views

Correct connections: 7-segment, 4-digit display with common anode

I see this connections for 4-digit display. All used pins set up on output. But, really, is it correct connections? Why it used A* input pins, and, digital pins set up on output, it is right? Maybe ...