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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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HD44780 display incorrectly black-on-blue instead of white-on-blue

I have a generic HD44780 compatible 16x2 LCD display, with an already soldered on PCF8574 module. Its backlight is blue, and the characters are supposed to be white (on blue). It is connected to a ...
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1answer
49 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 ...
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0answers
16 views

8x8 LED Matrix Display - 1588BS [closed]

I am a beginner starting to play around with the Arduino UNO, and I wanted to start playing around with my 8x8 LED Matrix Display that came with my Arduino starter kit. The label on the actual piece ...
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0answers
19 views

Arduino OLED Display strange output

I am trying to use the Adafruit SSD1306 lib with my OLED display for arduino but I've encountered an strange error. I am using the default example "ssd1306_128x64_spi" but the display is odd, the ...
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0answers
24 views

What am I missing? ST7735 TFT white screen

I followed this guy's guide with regards to wiring, etc., and all I seem to be getting is a white screen, as shown in these pictures. Is there an issue with the guy's guide, I'm missing or there is an ...
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0answers
40 views

How can I put this display SSD1306 to sleep?

I have built a kitchen timer and it is supposed to spend most of its life in sleep mode in order to save power. I am using the SSD1306Ascii library (SPI) by William Greiman. In this library I have ...
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0answers
39 views

LCD display not working

I am trying to read from a temperature sensor and write those values on a SD card. I am currently able to write it into a log file and display it on serial monitor. I have initialised the LCD, but ...
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1answer
29 views

Displaying characters as bitmaps

I have resorted to creating bitmaps for each number and a few letters for a 128x64 Oled module. This was to save memory and get around limitations of libraries such as the u8glib. If I had linux I ...
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1answer
68 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 ...
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1answer
52 views

Custom sleep function for Nextion

I have a Nextion 7 inch enhance type display. I have enabled sleep using thsp = 120 and thup = 1 line of code. Now display become sleep mode after 2min, if there is no any touch event. But, this ...
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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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0answers
45 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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1answer
50 views

Serial.print prints but lcd.print does not

The following code reads a txt file from a SD card, finds the corresponding character and prints the next 12 characters: ... char temp; byte who = random(1, 13); // 1 to 12 temp = ...
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1answer
223 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....
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1answer
26 views

LCD Identification FPC-JG00467-01B SR36 [closed]

I salvaged an old LCD from a calculator (Texas Instruments) and I want to interface it with a microcontroller (preferably an Arduino). I‘ve searched the whole internet but I simply can‘t find any ...
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1answer
115 views

Frequent ON OFF in SSR

I am working on a project on Arduino OLED MAX6675 thermocouple and SSR for my oven. My problem is when my SSR goes in LOW or HIGH state it turn ON and OFF several times before going to permanent HIGH ...
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2answers
160 views

7 segment display blinking

i'm not a professional in arduino code, when i want to display the DHT22 temperature and humidity sensor in 3 digit 7 segments , always the display show the sensor value and after 2 or 3 sec the ...
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1answer
35 views

Adjustable temperature [closed]

How can I make a project where I can adjust a temperature with buttons and a display and if the temperature is higher than that I set, a led turn on ?
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1answer
89 views

Waveshare 1.54 inch ePaper display requires 5Vs from Arduino Uno

I have an Arduino Uno and I would like to attach a Waveshare 1.54“ display (red, black & white) to it. All the specs tell me that it consumes 3.3 V which I have readily available on the Arduino ...
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1answer
144 views

Looking for light-weight Arduino OLED library that supports text and bitmaps

I'm trying to incorporate a screen into my Arduino code which is quite large already. The Adafruit SSD1306 library is overly large and has a lot of unnecessary things in it. I've found the ...
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1answer
162 views

Reading text from sd card is returning weird characters?

I have an ebook which is converted to a .txt file saved on an sd card which is connected to the arduino. I'm trying to display the words from the book on a 16x2 lcd display on word at a time. It works ...
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3answers
110 views

Need help with a program for a button to change the display on an OLED display

So I am programming an OLED display from my Arduino Uno. I am trying to have a button that switches the different words on the display. (The words are just placeholders for programs as of now.) My ...
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1answer
39 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 ...
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1answer
56 views

Arduino code to run 2 thing simultaneously [closed]

I am making a project for my college in which I need to measure the rpm of the motor and show the real-time clock on the 128x64 GLCD simultaneously but when I run the project it only shows one thing ...
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1answer
58 views

1.54 e-ink without driver [closed]

i wan’t to know if is possible to use this raw e-ink display with arduino. if it’s possible to directly connect cables from this ribbon cable to arduino without any driver pcb and control it with 3 ...
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1answer
183 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) ...
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0answers
68 views

Waveshare Display on ESP32 has weird graphic glitches

I am trying to pass an image to the display through the GxEPD module. I tested the display and its working fine with an example sketch. I am using a WEMOS LOLIN32 and a 7,5" B/W Waveshare display. ...
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0answers
95 views

Strange things happening with Arduino PROGMEM

I am currently working on a display library. The font should be stored in PROGMEM. The code looks something like this: unsigned int i = 0; Serial.println(pgm_read_byte(&font[1]),HEX); unsigned ...
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0answers
62 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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2answers
259 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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0answers
613 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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1answer
110 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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0answers
184 views

SH1106 OLED display on Mega2560 not working?

I am trying to use an SH1106 display with the Mega2560 but simply can't get it too work. I have tried using various different libraries and pins but nothing. (Note I got it working on an Uno just fine)...
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0answers
405 views

SSD1331 7pin oled to 4 pin I2C

This is the SSD1331 display, is it possible to run it on 4 pins with arduino uno?
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1answer
287 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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0answers
226 views

Trying to connect to Cayenne IoT server after initalizing SPI display

I am trying to simultaneously view sensor values on Cayenne dashboard and on a TFT LCD touchscreen connected to my Aruino Uno (ATmega328p). I am using a Adafruit_ILI9341 touchscreen running on SPI ...
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0answers
139 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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1answer
440 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
184 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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1answer
2k 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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2answers
643 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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0answers
246 views

ATtiny85 I2C SSD1306 (screen not working)

I have been on this issue for more than 3 days now after I got my SSD1306 I2C in the mail. I have a Tiny Programmer from Sparkfun, which I use with a breadboard. This is my pin layout: pin2-->SDA, ...
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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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2answers
91 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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0answers
107 views

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
860 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
449 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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3answers
5k 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 .
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1answer
233 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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2answers
1k 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 ...