Questions tagged [hd44780]
The HD44780 is a controller/driver IC for dot matrix character LCDs.
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LCD 16x2 is showing only black boxes despite correct wiring
I copied this tutorial from the linkalarm clock arduino but my LCD is only showing black boxes despite the correct wiring and code. I copied literally everything on the video. I also tried it with ...
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Can't clear HD44780 LCD screen with my own code using STM32F401RE
I have used this library to write something on my LCD screen. When I try to clear it with my own code, it doesn't work for some reason. Clearing text with library works fine. I'm using screen on 8-bit ...
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Controller received data whilst busy
This is my LCD command can anyone know how to fix this and add busy flag
void lcdinit()
{
delay(100);
...
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Can HD44780 communicate with FSMC?
I am trying to use FSMC instead of I2C parallel interface to communicate with HD44780 LCD controller. FSMC is connected to SRAM and HD44780 at the same time and the clock frequency is MHz. The clock ...
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Is this HD-44780 compatible display damaged?
I am developing an assembly application that includes a HD-44780 compatible 20x4 display over the I2C bus. After several attempts, I have finally managed to initialize the display in 4-bit mode and ...
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Interfacing 20x4 character LCD with LPC54628
This is the very first time I am dealing with the task of hardware interfacing.
I needed to interface a 20x4 character LCD with an LPC54628 microcontroller.
I am using https://www.sunrom.com/p/20x4-...
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Can anyone shed light on why a I2C PCF8574 LCD driver would only be using I2C 'read' operations to 'write' to the device?
I am trying to understand a simple I2C driver for a HD44780 with soldered PCF8574 daughter board, I'm still relatively new to electronics engineering (read: 20 years out of date), but an old hand with ...
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Looking for a way to re-program 16x2 LCD display EEPROM font
Some time ago I've seen this topic - asking where does the fonts stored in 16x2 (1602) LCD display.
Does a 16x2 LCD display has its own EEPROM?
I'm really interested in this, and didn't find any ...
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Groove LCD RGB I2C protocol
Devices:
RapberryPi 3 Model B+
GrovePi+
Grove LCD RGB
As a learning exercise, I'd like to write a driver for the LCD listed above.
I'm using the HD44780 instruction set as reference, and can ...
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Terminology - VDD vs VSS?
What is the correct voltage terminology for VDD and VSS?
I've been installing a Winstar WEH001602D OLED and was struggling until I realised that it appears to have pins 1 and 2 reversed compared to ...
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HD44780 LCD Driver for STM32F3
I am trying to interface an HD44780 LCD with an STM32F3 MCU. I'm using examples from the website http://controlsoft.mandela.ac.za/STM32F3-Discovery-Board/Example-programs/HD44780-LCD-(16x2-LCD) it ...
user188731
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PIC18F452 interfacing with HD44780 LCD in assembly
I have been trying to get a Hitachi HD44780 LCD to work with my PIC18F452 for a few days now, with no luck. I have tried moving the data lines to different ports on the microchip, I've tried ...
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Is this 20x2 character display broken?
Recently I've got my hands on several 20x2 character displays which don't seem to work. This is what they look like:
Apparently, they are HD44780-compatible. The three 16-pin connectors (single-row ...
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HD44780 DDRAM and CGROM Interaction
I am looking at interfacing to a HD44780 LCD display with an STM32VL discovery board. I am aware drivers exist but in the interest of learning I am doing it myself.
I am curious about the interaction ...
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How do I get this LCD to work on Proteus? [closed]
I'm trying to display the letter "A" on LM016L (datasheet). I keep switching the E input but I get nothing.
This is my circuit:
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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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power HD44780-based LCD with 3.3V by using a negative contrast voltage?
I have a circuit that runs on 3.3V and want to use an HD44780-based LCD with it (which normally requires 5V). The LCD logic and backlight works fine with 3.3V, but the contrast doesn't, so nothing can ...
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Will HD44780 display be hurt with 20mA on contrast pin? (pin 3)
I'm driving an LCD HD44780 display using my Raspberry Pi B+.
Using a GPIO pin I'm managing the contrast adjustment (pin n. 3) on my LCD display with PWM.
In the ...
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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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LCD interfacing with msp430
I am making a contact less tachometer based on magnets .I am using msp430g2253 micro controller and HD44780 lcd.
I have done certain calculations for calculating rpm in the main code and now i want ...
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driving a 5v LCD with a 3.3v atmega328p microcontroller
Am using adafruit (American hobbyist electronics components retailer) breakout for the max31850 thermocouple amplifier who's data line isn't 5v tolerant. Therefore I want to power my atmega328P @ ...
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HD44780 in 4bit mode connected to only ONE PORT on PIC
i am new to PIC programming. I am using MPLAB X + XC8 compiler. I have on a breadboard an PIC18F4550 connected to a HD44780 compatible LCD. Digging online i found out a routine to interface the PIC ...
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Wiring up an LCD display with unknown controller
I found an old LCD in my pile of trunk. I would like to be able to use it. However, someone (possibly / probably me) sawed off the part of the PCB with the series code, so I can't know what the ...
user17592
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Weird problems with LCD (HD44780 compatible)
I've been trying to interface with a HD44780 compatible display (16x2) for quite a few hours now, but have run into some weird behavior problems which I can't solve.
My setup:
I'm using the LCD in 4-...
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Using HD44780 display without contrast potentiometer
I found tutorial about connecting HD44780 display to Raspberry Pi.
In this tutorial there is no contrast potentiometer. Vo is connected to ground.
Tutorial author says:
In order to control the ...
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Extra pins on HD44780 lcd
I am looking at ordering this lcd https://www.sparkfun.com/products/255, however when looking at the picture it seems that there are some extra pins on the right side not described in the hd4470 ...
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Does C-1602A-1YN LCD use the HD44780 controller?
I am new to using PIC microcontrollers and electronics in general. I have been reading a tutorial on how to interface a PIC with a HD44780 compliant LCD. As I have been shopping for a LCD I have been ...
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16X2 character LCD changes contract intermittently and doesn't work with raspberry pi
I've been following adafruits RPi tutorials (and bought their starter kit)
I had an Sparkfun LCD Kit lying around. (It has an HD44780 controller LCD, a 10K trimpot and a 16 pin male header)
I ...
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A small, thin LCD for my device [closed]
I've been looking for a good display for the handheld device that I'm building and I've liked the various HD44780-based displays that I've tried. (like for example this one: https://www.sparkfun.com/...
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How to program an ATmega32 in C++ to control a LCD?
I'm electronics student. I'm a newbie in programming. I have loved C++ after watching some videos on C++. Am using Atmega32 uC, WinAVR GNU GCC compiler programming tool, 16*2 Hitachi HD4478OU LCD for ...
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How does the HD44780 LCD work at the low level?
I'm not asking for a driver specifically, but how exactly it works.
I looked up the 2 chips that were in it. HD44780A00 and HD66100F to be exact. I'm assuming one is a display driver? And the other ...
user3073
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Interfacing HD44780 compatible LCD display and Spartan 3 FPGA
I've recently bought HD44780 compatible LCD screen (16x2) from eBay. I want to use it with my Spartan 3 FPGA development board, but after I've thought a little about it, I'm not sure that I can use it....
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HD44780: How long do I have to wait for busy flag to reset?
I'm driving a HD44780 controlled character LCD (HY-0802B-104-R) with shift registers (74LS164). So, the communication will be one-way only; I won't be able to read any data from the LCD.
Normally, ...
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Power-up Initialization of HD44780 LCD Module
I'm using an HD44780 clone LCD module a KS0066U. Everything works ok on the module except when I rapidly power cycle the device (on->off->on). For some reason a very short interruption in the power ...
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