Questions tagged [character-lcd]

A LCD display for printing characters only. It's usually very easy to interface with and suitable for simple microcontrollers to create menus or show system status. HD44780 compatible LCDs are the most common type.

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40 views

Long term stability of 1602 LCD contrast calibration?

When setting the contrast on a 1602 or similar LCD module such as this one does the contrast remain relatively constant over the lifetime of the display or would it require periodic recalibration as ...
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1answer
67 views

LCD substitute for 7-segment LED display? [closed]

For a project of mines, I use a 7-segment LED display, the SA52-11EWA, common anode. All OK, but the display is poorly visible outside, under the sun. Very annoying. So I thought to use an LCD display ...
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1answer
54 views

How is this LCD controlled?

Source: https://ozhealth.com.sg/product/genial-digital-thermometer-t15-orange/ I tore down a digital thermometer today (a Genial T15), and the interface to the LCD caught my eye: although there were ...
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1answer
67 views

Reading busy bit of 1602A lcd

I made a toy program on Arduino to write "Hello, World!" to the display using delays after every command. Now I was wondering if I could get rid of the delays if I read the busy bit. This is ...
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1answer
36 views

LCD backlight connection, K pin connected only

I have been trying to build the attached schematic, and my issue lies with LCD backlight. The designer has attached the cathode (K) pin, but not the anode (A) pin. This did not work for me. It is an ...
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1answer
86 views

Unable to communicate with LCD2004a via I2C (Nucleo-F103RB)

Hell guys, i'm trying to communicate with LCD2004a with the I2C extender. i followed this guide: https://www.youtube.com/watch?v=7mQppaEJjT4 what i did: I generated project using CUBEMX to Keil ...
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1answer
60 views

Projection clock: how to make a custom display?

I have a projection clock which projects a red image of the current time on the ceiling. I want to know if it's possible to find/build a similar display that would be computer-controlled (project ...
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0answers
95 views

Write received character from PS/2 keyboard to LCD1602

I am trying to read a pressed key from a PS/2 keyboard and display it on a LCD1602 display. I wrote one entity and architecture which detects a pressed key. If it received the 11 bits (1 start bit, 8 ...
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196 views

PIC18F4550 - Display 16X4 and menu with more than 4 items

I need to print a list of items of a menu in a 16x4 LCD using a PIC18F4550. I already did it using MPLABX and XC8 compiler and it worked fine, however, I need to migrate it to mikroC environment. But, ...
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2answers
62 views

Used different ports of microcontroller for LCD data pins

I have used different ports for data pins of LCD, RD11 and RD0 pins for DB4 and DB5 and RC14 nad RC13 for DB6 and DB7 . I am using DSPIC30F5011. I have incorporated this on design and manufactured PCB....
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1answer
111 views

Is heat slowly killing my 20 x 4 LCD?

I'm using a QC2004A 20 x 4 LCD (blue back ground/white text) with a PCF8574 I2C backpack in a GPS trip logger. I leave the trip logger in the car. When I start the car, the trip logger starts ...
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1answer
169 views

Do carbon resistors not follow tolerance as they age?

I'm trying to figure out the problem with my LCD and resistors. The micro I'm using is AT89S52 and the LCD is a standard display based on the HD44780 chipset. Part of the code in my micro allows for ...
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1answer
42 views

Sharing a HD44870 display between multiple controllers

I have an existing third party system that has a HD44870 compatible display used for output. This third party system cannot be changed (for a variety of reasons), and I need to retrofit a device to ...
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2answers
817 views

How to operate 1602 LCD on 3.3V [closed]

I wonder if its possible to run a common 16x2 LCD with 3.3v power supply. Its datasheet shows supply voltage = 5V. Are there any 3.3V variants of 16x2 LCD modules?
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1answer
89 views

LCD 16x2 can't display [closed]

I have a small project with AT89S52 and LCD 16x2. I build circuit and simulation in Proteus. It works normally. But when I build PCB, LCD can't display the value. I just adjusted rheostat to change ...
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2answers
677 views

LCD Backlight Control Circuit

I'm trying to control the back-light of a TC1602A-09T 16X2 Character LCD by using an output pin on a Teensy 3.2 microcontroller. This is the circuit I have at the moment: The LED- pin would be ...
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1answer
84 views

Internal structure of LCD controller

I have the following diagram of a HD44780U LCD controller What is the difference between CGRAM and CGROM. What is DDRAM for ? Where are the customised characters stored ? What does it happen ...
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1answer
182 views

Low voltage LCD glass displays

I have a simple circuit I built using a 7-segment LCD glass display and an ATTiny (just a simple timer for now). I was hoping to use the setup in a low power, single coin cell device (3.3V - 2.7V), ...
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1answer
58 views

Programmatically determine the lowest waiting time for character LCD display

I made working code in an older microcontroller for a character based LCD that's based on the HD44780 chip. My code stops execution of everything else every 70uS to display one character from the ...
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2answers
436 views

STM32F105 FSMC Pin assignment [closed]

How do I assign certain pins to the appropriate FSMC pins? I've looked through the reference manual and the examples, but there's nothing about pin assignment except configuring them as alternate push-...
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2answers
238 views

Where to apply manual delay in character LCD

I went to http://www.elm-chan.org/docs/lcd/hd44780_e.html in an attempt to find out how to make an LCD module work with the shortest timings. While the site does help with the initialization of the ...
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1answer
78 views

LCD contrast switcher for 8051

I'm trying to come up with a good circuit from common parts that will allow me to set predefined contrast levels to the LCD from the microcontroller. I've seen an example on the internet but its for ...
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3answers
725 views

How to interface with micro LCD projector?

I disassembled a cheap "wall projection" clock: And removed the LCD board that displays the projected clock readout in front of the super bright red LED: As a small hobby project, I'd like to wire ...
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1answer
97 views

How to show a long sentence on character LCD by using bascom?

I want to show a long message that going to differ every time and it's 3 lines or less. This message comes from Sim900. I cant show the whole sentence on my 4x20 lcd. how can I print it in several ...
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47 views

Interfacing NT7605-based LCD with MSP430

I've spent the last week or two trying to get my MSP430 to communicate with an NT7605-based LCD. I found this post with a very similar problem: Debugging initialization of LCD with NT7605 driver I'...
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1answer
238 views

QC1602a Font Color

I have an unbranded QC1602A V2.0 display connected to a Raspberry Pi over 4-pin interface mode. Backlight and contrast are set in hardware, neither are controlled over the Raspberry Pi. If I setup ...
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1answer
155 views

LCD SPLC780D Initialization sequence fails

Microcontroller model : PIC32MX340F512H LCD controller : SPLC780D LCD module : MC42005A6W-FPTLW3-V2 (20*4) I have been struggling for two weeks to get a SPL780D based LCD module to work. I checked ...
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2answers
47 views

Character/Numeric TN LCD too Dim with a Head on View as Apposed to a Side View

I am using an LCD-S2X1C50TR and direct driving it with a PSoC 4200 Microcontroller. I was testing my circuit by viewing the LCD at an angle and it looked fine. Until I put my eyes directly above it, ...
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1answer
139 views

PIC18F4550 and Sparkfun RFID Starter Kit with ID-12LA RFID Module, TAG Reading Problem

Recently I bought a SparkFun RFID Starter Kit with ID-12LA RFID Module. Similar to the one in the following Link: https://learn.sparkfun.com/tutorials/sparkfun-rfid-starter-kit-hookup-guide. I tried ...
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1answer
98 views

LCD 2*16 custom characters

I need to write custom characters in LCD 2*16. I use CGRAM to make custom characters but as far as I know, I can't write more than 8 custom characters at a time (please tell me if I'm wrong). I'm ...
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1answer
90 views

constant character darkness on lcd even in low battery

At this time I have an lcd where I hook up a 1k resistor between contrast and ground. As the battery voltage drops, the text on the screen also fades. I could make a manual switch and switch between ...
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1answer
541 views

Problems with LCD when using it with ATmega328P

I'm trying to use a 16x2 LCD screen to be programmed by the ATmega328P microcontroller using Atmel Studio v7. I am using a library for this purpose that I found on the internet. I wrote this program ...
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1answer
110 views

Character mask VGA display

Im building a VGA (640x480@60Hz) adapter for my homebrew project but i dont have enought memory to store a framebuffer. Since im using 8 bit memory i plan to do 8 bit color, but 8 colors would be ...
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1answer
438 views

How to use CD40109BE to level shift one input from 3v to 5v?

I want to use the Raspberry Pi's 3.3v GPIO pins to control whether a 5v LCD screen is on or off. The Raspberry Pi has a 5v pin but it cannot be turned on or off using Python or similar. Only the 3.3v ...
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2answers
71 views

With power only on this LCD, will I see anything?

If I only connect the VSS (pin 1) to ground and VDD (pin 2) to voltage, will I see anything on this LCD screen (as a test)? Might I expect to see a cursor of some type? Simple data sheet: http://www....
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2answers
78 views

use some ic for driving lcd 1602 instead of bit banging

So the lcd 1602 interface is pretty complicated,i basically just want to write the data to the pixels but i have no idea how.my questions:1.The lcd works at about 270khz so the address "d0-d07" must ...
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1answer
498 views

HD44780 LCD - proper addressing for overseas 16x4 line display

I bought a few 16 character by 4 line LCD's from ebay that are HD44780 compatible and today I was testing them. The LCD advertisement is at: http://www.ebay.ca/itm/LCD-16x4-1604-Character-LCD-Display-...
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1answer
195 views

Interfacing 20x4 character LCD with TI TM4C1294 generates some random characters

I have a 20x4 character LCD connected to my TI TM4C1294 kit as follows: Data bus to port A. RS, RW and E pins to port L 0-2 I wrote this code in order to drive it: ...
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2answers
78 views

PIC18 LCD Screen troublshooting

I am trying to initialize a 4x20 LCD using a PIC18 in 8bit serial interface. This is an LCD I found lying around in the lab and I cant find a datasheet for this exact one. I am struggling to get it ...
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1answer
853 views

16x2 LCD connected to msp430g2553 launchpad by i2c: contrast issue

I am testing a 16x2 LCD screen specifically the 'MCCOG21605B6W-FPTLWI' from 'MIDAS'. It is connected to the with the 'msp430g2553 launchpad'. The connections are described in the commented code ...
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1answer
252 views

Weird behaviour from a 40x4 LCD Character Display [closed]

We have a fire monitoring/management panel which has a 40x4 character display attached to provide information in the event of a fire. It has recently started "glitching out", it displays random ...
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0answers
89 views

Segmented LCD — Voltage Sag Solutions

I've got a remote control transmitter, with a segmented LCD display. The MCU has an integrated LCD driver that is driving the display. I've got the MCU interfacing and working with the LCD. The LCD ...
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2answers
301 views

Different voltage levels for LCD and microcontroller

I want to interface my microcontroller (ATmega32) with a 2x16 LCD. I am powering my microcontroller with 3.3V, and I need to use 5V with the LCD. Will be there any problem with that (i.e data signals ...
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0answers
104 views

Identify LCD display orientation

When buying an HD44780 compatible LCD display with a backlight, is there a way to identify the orientation of the text on the LCD based on a standard part number? I'm asking because I don't want to ...
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2answers
1k views

What is the expected lifespan of those 16x2 character LCD?

I want to use the HD44780 character LCD (commonly available in 16x2 characters, though I am using the 20x4 version) in an industrial application but since it will be on 24x7, I am just a bit worried ...
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3answers
140 views

Hacking characters in custom LCDs [closed]

Say I have a device/instrument that has custom LCD for display with mix of text and graphic/icon on the corners. I want to log the values and feed it to the computer or say automate a response when ...
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1answer
810 views

UART effecting “character LCD(I2C)” in stm32f103 [closed]

I'm using HAL API for programming, I programed if UART got some certain text then display the counter in character LCD, Then increment counter, If again got that sentence repeat these (Increment ...
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1answer
388 views

Wiring up a 1602L/1602S LCD and switches

I need to replace a 1602L LCD (winstar i think) with an ACM1602S LCD. The original lcd had this resistance RA also the end of the white wire from the switch was connected to the part that is marked ...
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2answers
624 views

Arduino project LCD displays gibberish when water pump is activated? [closed]

The setup is I have connected 9v battery to motor and I have tried using mosfet and but both works fine . I used cap between vas and V can pins of LCD it solved but the values are 20 percent high than ...
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1answer
78 views

Is Write/Read pin in LCD is need to changed every time? Or is it ok if we fixed it to write only?

We are using 16X2 LCD. In that we are only going to write to LCD we are not going to read anything from it. Is it ok if we put it as write pin ? or every time after writing do we need to change it as ...