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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LiquidCrystal issue with HD44780 display

Here my sample code for an Arduino Leonardo-based custom board: #include <LiquidCrystal.h> const int rs = 3, en = 0, d4 = 4, d5 = 30, d6 = 12, d7 = 6; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); ...
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Can this display's address be changed?

I need two displays hooked up to an Arduino MKR Wifi 1010, and I saw this video which shows how to do it: this video. I also would like to have a full color oled display about 1 inch big so I would ...
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LILYGO TTGO T-Display cannot detect MPU 6050 Accelerometer, Gyroscope and Temperature Sensor

I've been trying to connect a MPU 6050 Accelerometer, Gyroscope and Temperature Sensor to a LILYGO TTGO T-Display to get readings displayed on the serial monitor (for starters). The wiring is pretty ...
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2 answers
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reading strings from multiple Arduinos

So I have 5 Nanos all trying to crack a password, the idea is each one has one fifth of the list so they can test 5 at a time, then when it is found, I want it to be displayed on a screen I have, the ...
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Multiple Arduinos connected to one display

I have one display screen, and 5 Arduino Nanos. They are checking to see if passwords in a text file hash to a specific hash, then display it on the screen when found. Since they aren't all sending ...
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Display temperature on a Grove - OLED Display 1.12"

I wish to display the temperature on a Grove - OLED Display 1.12". I see the reading in the serial monitor but not on the display. Any reason why? Code: #include <Arduino.h> #include <...
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2 votes
4 answers
530 views

My program is using too much memory

I work in a warehouse and I was tasked to make a device which will show the location of any product when Product ID is given. All of our product has 3 things. Product ID, Rack Number and Gap number. ...
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399 views

Convert String to const unsigned char

String abc ="0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff"; const unsigned char displaydata={reinterpret_cast<const unsigned char*>(abc.c_str())}; display.drawBitmap(...
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How to light up middle points in a display with 4 digits? [closed]

How to light up the two points that is in the middle? It only lights up when the digB is set to LOW, and it lights up all 3 points that is in the middle. Example code: const int displayPins[] = {2,3,...
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Adafruit TFT 1.3 inch display with arduino-rotate the font

I am using Arduino MKR1500 with adafruit 1.3 inch display(https://www.adafruit.com/product/4313) and I want to rotate the font on the screen by 90 degree. I tried setRotation() and added an angle in ...
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ESP32 WROOM32 SPI EMF issues

I'm trying to run Waveshare SSD1327 128x128 screen via SPI on ESP32 WROOM32 board. On ESP8266 (D1R1?) it works flawlessly while using HW SPI but when I run it on esp32, anything connected to mains ...
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1 answer
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how to display text to 8x8 matrix with 64-bit long integers?

I have an array of 64-bit integers to display on an 8x8 led matrix const int LEN1 = sizeof(Hours); const uint64_t Hours[] = { 0x00043c3c3c3c3c00, 0x000c3c3c3c3c3c00, 0x001c3c3c3c3c3c00, ...
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Artefacts on display when adding seemingly unrelated code

I have this simple program, where I am implementing a menu structure on an OLED display and a rotary encoder. The code works functionally as intended, however when I add more menu items, then I get ...
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Program an lcd display with 12 pins

I have a screen just like this (is the datasheet). My question is, Can I use it to an Arduino board?
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Arduino lcd displays random chracters

I have connected arduino nano every to my lcd display. It works perfect when i put all my code in setup() part. But when i put the code in loop() it does werid things. I have to put my code in loop(), ...
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ESP32 FREERTOS crash using Adafruit ST7789 in tasks with the Wifi enabled

I am trying to create a clock using a ST7789 display and a DS3231 RTC. In this clock I want to use NTP to keep it synced and maybe use the WiFi to anything else. My problem started when I have tried ...
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anyone heard of MCUDEV_TFT1.44 display? I can't figure out how to connect it to Arduino

I bought this tft display on Aliexpress: https://www.aliexpress.com/item/1005001579367288.html?spm=a2g0s.9042311.0.0.72164c4doyqAub it says "MCUDEV_TFT1.44" below the display. I can't find ...
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2 votes
1 answer
272 views

4 Digit 7 segment display flickering

I am attempting to make an Arduino counter using a 4 digit 7 segment display. The problem I am encountering is the display flickers. I am using an Arduino Uno and 5641AS digit display (so common ...
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2 answers
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Detect if a display is connected

I want to detect wether a display is connected or not. This is the display: https://www.az-delivery.de/en/products/1-77-zoll-spi-tft-display I read connecting a pin of the display with another pin ...
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Efficient workflow/tools for converting color images to hex arrays

I would like to display 65k color animated gifs on my oled. I'm using the adafruit library for https://learn.adafruit.com/096-mini-color-oled Now I need to convert a significant number of images to ...
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2 votes
0 answers
509 views

Sending a JPEG from one Arduino to another

I've got an Arducam OV2640 which takes a picture as a JPEG that I'd like to send to another Arduino using a pair of nRF24L01 wireless transceivers to eventually display it on an SSD1351 OLED. ...
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Getting Trouble in multiple ST7789 SPI LCDs (without CS) with ESP32

I am developing a product in which i have to use 5 LCDs. The LCD i am using does not contain CS pin. SO i had to use MUX for muxing of complete SPI bus from one LCD to other. But the issue i am facing ...
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2 answers
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Nextion Display not getting updated data

I am using an Arduino Mega to display the readings of 4 pots on a Nextion Display as well as store it in an SD Card with the time stamp. I keep getting: recvRetCommandFinished err on the serial ...
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488 views

Nextion won't update text using data passed in Arduino Uno serial print

Q: Is it possible to send data in variables from Arduino to Nextion through SerialPrint? If so, what is the correct syntax? I have an Arduino Uno connected to a Nextion NX4024T032 and a Sunfounder ...
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Use Android on Arduino TFT

I don't know whether this is possible or not but is there any way that I can run something similar to Android on a normal TFT. I want to make complex graphics but can't program those complex programs ...
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3 votes
1 answer
834 views

Alternatives to Nextion display

I am wanting to have a display where I can design the GUI on a program and then somehow transfer it to the display. For the graphics I want to make, it would be really hard to manually write the code. ...
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1 answer
155 views

Estimate soc battery and discharge time using Arduino Uno

I am currently learning to do a project for estimating the soc of LiPo batteries with coulomb counting and calculating discharge time using Arduino Uno to display a warning when the battery runs out. ...
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4 votes
1 answer
1k views

ST7789 TFT display only shows a correct image while Arduino reset button is held down - Why?

I am trying to get the ST7789 TFT display to work with Arduino. I followed online guides for connections and am using the fast library fron github and included workbench ino (https://github.com/...
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1 answer
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Help in personal alarm clock project, cant write time on seven segment display

I'm trying to make a type of Arduino alarm clock, which when the time I inputed is equals to the current time, a servo will turn on my lights. It basically consists of a Keypad, an RTC DS1307 and a ...
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1 answer
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OLED 'SH1106_WHITE' was not declared in this scope

I was following FREE Functions to draw graphs on OLED displays on YouTube but mine OLED display doesn't support Adafruit_SSD1306 library,but it works on Adafruit_SH1106.h driver. The code that is ...
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1 vote
1 answer
259 views

Arduino Nano and 0.96 i2c oled screen not working

When I try to scan the i2c address it stays stuck on "i2c Address Scanner" which is the first line of the code. My screen is connected with VCC-5V, GND-GND, SCL- 4.7K resistor->A5, SDA- 4....
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2 votes
1 answer
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I want a bar type display for my Arduino Project

I am trying to make a smart table project. But I have stumbled upon one problem, that is I don't know which display should I use. I need a display that has roughly aspect ratio of 2:1 but also has a ...
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MD_Parola display issue when constructing test

I'm using ESP8266 and 4 dot Matrix Tiles, to display clock ( updates using NTP and WiFi ). Everything is working well, but only when I'm constructing text using a const char* type. But, since I wish ...
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How to use LCD display HD44780 with arduino without using any library

My professor wants me to implement a display to an old project prototype we had laying around on the lab. But he wants me NOT to use LiquidCrystal.h library or any other to achieve that. I read ...
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1 vote
1 answer
580 views

Measuring car speed between two points: What sensor to use and how to cover the distance?

PROBLEM Cars regularly exceed the speed limit in our street SOLUTION Measure each car's speed and clearly display the speed to the driver EXECUTION Measure the time the car takes to cover a set ...
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Can it time between blips, store the time between blips, subtract one time from the other and divide one time by another and display it?

I am counting rotations of a shaft and timing events that occur during that rotation. I wish to display the event timing as a percentage of ~1/4 of the rotation timing. This would involve recording ...
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2 answers
1k views

How can I get my LCD display to display Chinese and Japanese characters?

I'm making a project that requires me to display Chinese and Japanese characters on an LCD. However, the 16x2 LCD display I have does not seem to support displaying Chinese and Japanese characters. If ...
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1 answer
147 views

What does display.setSegments(&segto, 1, 1); do?

I am using a TM1637 display for my Arduino Uno. The goal was to just light up one point of the colon in the middle - what seems to be kind of impossible to accomplish. During research I stumbled over ...
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1 vote
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327 views

esp32 e-paper driver not working

I am trying to setup waveshare 7.5 display (Waveshare_7_5) with esp32 e-paper driver using ESP32-e-Paper-Weather-Display My code is here https://pastebin.com/raw/2zQDe9a9, have corresponding ...
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1 vote
1 answer
225 views

Connecting microSD reader and e-paper display to Nano at the same time?

Pretty much as the question states, I'm wondering if it's possible to connect (this: https://www.waveshare.com/7.5inch-HD-e-Paper-HAT.htm ) 7.5" e-paper display that has raspberry pi HAT and an ...
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1 vote
2 answers
129 views

How to write to the second line of a display?

I got this 4 line display from Mouser: https://www.gravitech.us/20chbllcd.html, and I get it to work fine for lines 1 and 3 (as line 3 is just the 21st character of line 1). But I am struggling to get ...
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1 vote
3 answers
419 views

240*320 transparent OLED display with Arduino

A long time ago I ordered this transparent OLED display (from a chinese supplier on alibaba) planning on interfacing it with an Arduino but didn't really have the skills to get the project going. I ...
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340 views

FC-16 led matrix module based on MAX7219

EDIT: const char *pc[NUM_ZONES] = { "ROOM", //0 "SUBJECT", //1 "GRADE",//2 }; I did this and I can't get them to display every row simultaneously. void loop(void) { DateTime now = rtc....
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1 vote
1 answer
458 views

i2c scanner stuck on scanning for my 0.96in OLED screen with my Arduino Nano

My pins are connected as follows; vcc-3v3, gnd-gnd, sda-A4, scl-A5.
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Arduino Uno and 7 segment display - wrong value displayed

I am working at this project and I found that if I have set the temperature by rotating the pot to 312 C, the iron started heating up, but when it was at about 60 C then on the display (7 segment, 3 ...
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194 views

Controllino Mega and Fatek HMI

I have a setup that controls the rotation of two stepper motor using Arduino UNO, HBS860H stepper drivers, 4X4 keypad and LCD screen. I have replaced the Arduino Uno by a Controllino Mega and it works ...
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How to pause the analog value according to input signal applied to a particular digital pin?

I'm working with a digital blood pressure meter using arduino nano. I need to display the pressure reading during inflation and deflation of the cuff instantly. And when an input signal applied to a ...
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Slow refresh rate of 1.8 TFT display

I have 1.8 TFT display for Arduino Nano and it changes color very slow. When I try to change the color of the whole screen I see how it changes color line by line. I use "Adafruit GFX graphics core" ...
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1 answer
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Nokia 5110 LCD number display problem

I have a problem regarding a Nokia 5110 LCD display. I am currently building a soldering station based on a PID controller. The original code was using a 7 segment display and I adapted the code to ...
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618 views

Scroll Left to Right on MAX7219 Display

For scrolling from left to right (Arabic letters) I need a function to print words/sentences on the MAX7219 display. [By setpixel(x, y) function] I did a lot of searching and my efforts failed. I ...
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