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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92 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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82 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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35 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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60 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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COG PFC2119x driven LCD Display: Add custom characters, can get it to work

Story (skip if you want) Last week I received two malfunctioning DAB radio's from the 'brand' Tesco (type DR1551W) for free and because I cannot fix the problem with these units (missing service ...
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How to troubleshoot a NT7603 run display?

I have a NT7603 run lcd in 8 bit mode. I previously had a 44780 display running on the same code, but switching lcds seems to have messed something up. The specific unit is a buydisplay.com erc1602-2. ...
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82 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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224 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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54 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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90 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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44 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
159 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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59 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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54 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
252 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
68 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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40 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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64 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
106 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
45 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
117 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
93 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
73 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
311 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
97 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
278 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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58 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
71 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
402 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
161 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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67 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
720 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
214 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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80 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
208 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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46 views

Best values for R and C for LCD driver

This is a circuit I incorporated in my major project to drive an LCD. For C1, I used a 2.2nF ceramic disc capacitor and the resistor is 100K which based on a basic RC calculator, works out to be about ...
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99 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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803 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
130 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
691 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
288 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
512 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
74 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 ...
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213 views

Does all the alphanumeic LCD modules have backlight? and where can I find LCD commands for this module?

I am using Oriole 8x1 LCD Module - 08108-3SL/X. I interfaced this module with my pic18f458 and made it display "12345678", so its working.However, the back light is not ON and when I vary the contrast ...
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447 views

Embedded system 16x2 lcd user interface

I'm developing a UI for embedded system application. I have to handle few critical tasks always which are being called in main infinite while() loop. Program flow enters into sub-menu if key is ...
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131 views

Why are LCDs and their controllers (HD44780, etc) hard to find as a consumer direct from their manufacturer? [closed]

I've been researching the development of an arduino-compatible with a built-in 16x2 character LCD, and have had no success finding anywhere to directly buy a LCD screen and the controller without ...
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283 views

Printing SD Card File contents on LCD

This is a part of my program which reads data from SD card File and Display that on LCD screen. ...
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1answer
333 views

16x2 LCD Missing Components on the Back [duplicate]

I'm quite new to electronics and am doing it as a hobby. I recently bought a 16x2 LCD display online to use it with an Arduino. When I received it, it noticed that there were a few components missing ...
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1answer
4k views

How to fix Hitachi HD44780 16x2 LCD garbled display in 4 bit mode?

It often happens that a HD44780 16x2 LCD shows garbled characters during usage. Most help on the web advises for using snubbing techniques to prevent voltage noise such as induction spike. I've done ...
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1answer
170 views

Is it technically feasible to design a microchip that won't fail foreign characters? [closed]

I used to work as web developer and did the same part of the project for several decades: Making sure that our Scandinavian characters åäöÅÄÖ... will work. It was feasible and it did work, basically ...