Introduction



The most commonly used Character based LCDs are based on Hitachi's HD44780 controller or other which are compatible with HD44580. In this tutorial, we will discuss about character based LCDs, their interfacing with various microcontrollers, various interfaces (8-bit/4-bit), programming, special stuff and tricks you can do with these simple looking LCDs which can give a new look to your application.

For Specs and technical information HD44780 controller Click Here

Pin Description



The most commonly used LCDs found in the market today are 1 Line, 2 Line or 4 Line LCDs which have only 1 controller and support at most of 80 charachers, whereas LCDs supporting more than 80 characters make use of 2 HD44780 controllers.

Most LCDs with 1 controller has 14 Pins and LCDs with 2 controller has 16 Pins (two pins are extra in both for back-light LED connections). Pin description is shown in the table below.


Figure 1: Character LCD type HD44780 Pin diagram


Pin No. Name Description
1VSSPower supply (GND)
2VCCPower supply (+5V)
3VEEContrast adjust
4RS0 = Instruction input
1 = Data input
5R/W0 = Write to LCD module
1 = Read from LCD module
6ENEnable signal
7D0Data bus line 0 (LSB)
8D1Data bus line 1
9D2Data bus line 2
10D3Data bus line 3
11D4Data bus line 4
12D5Data bus line 5
13D6Data bus line 6
14D7Data bus line 7 (MSB)
Table 1: Character LCD pins with 1 Controller
Pin No. Name Description
1D7Data bus line 7 (MSB)
2D6Data bus line 6
3D5Data bus line 5
4D4Data bus line 4
5D3Data bus line 3
6D2Data bus line 2
7D1Data bus line 1
8D0Data bus line 0 (LSB)
9EN1Enable signal for row 0 and 1 (1stcontroller)
10R/W0 = Write to LCD module
1 = Read from LCD module
11RS0 = Instruction input
1 = Data input
12VEEContrast adjust
13VSSPower supply (GND)
14VCCPower supply (+5V)
15EN2Enable signal for row 2 and 3 (2ndcontroller)
16NCNot Connected
Table 2: Character LCD pins with 2 Controller
Usually these days you will find single controller LCD modules are used more in the market. So in the tutorial we will discuss more about the single controller LCD, the operation and everything else is same for the double controller too. Lets take a look at the basic information which is there in every LCD.


Share it! Like it!

Conversation

Wed Sep 20 2017, 12:36 AM
Ted
In a missing pulse detector using a 555 timer connected as a monostable vibrator with a PNP transistor,how does the positve input pulse turn on the PNP transistor?
Sun Sep 03 2017, 02:29 PM
martymarty
How do I connect an <NOKIA 1100 LCD > to an atmega328P ?
poojab51296
Sun Aug 20 2017, 10:23 AM
i am intending to interface sd card with STM32F4 and want to write a file in sd card using SPI protocol but using HAL only. Can anyone help me PLEASE!!!!
poojab51296
Sun Aug 20 2017, 10:22 AM
hello
rawat742
Fri Aug 18 2017, 11:37 AM
hi @ angel patel i will attach a file i hope it will be helpfull for you
ExperimenterUK
Mon Aug 14 2017, 09:57 PM
@ angel patel... just log in and post your problem
Mon Aug 14 2017, 01:45 PM
angel patel
hey any one help to make the led scrolling display
desuza6
Sat Jul 29 2017, 07:09 AM
I see the code for step motor h l 298 to rotate 45 degree, but all delay time, if I want to input sensor to h the pulses to stepmotor
rammichael
Thu Jul 27 2017, 12:05 PM
okay fine
ExperimenterUK
Wed Jul 26 2017, 07:51 PM
Please post questions in the forum, the chat box is for chat

Downloads

Comments

butt_butt
Fri Sep 08 2017, 02:58 PM
RKTJ
Fri Sep 08 2017, 01:55 PM
ahmed2016
Thu Sep 07 2017, 05:55 AM
Johnleonarduc
Sat Sep 02 2017, 01:48 AM
Suseethra
Fri Sep 01 2017, 06:31 AM
ashokreddy424
Sat Aug 26 2017, 04:02 PM
abdullah6484
Tue Aug 22 2017, 10:21 PM
crank.tp
Mon Aug 21 2017, 02:17 PM

Online

Guests: 87, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 37888
Newest member: butt_butt
Forum Activity
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Sep 11 2017, 12:07 AM
The hardware for connecting to a PC or a modem is...
Suseethra Avatar
Posted By Suseethra
Sat Sep 09 2017, 09:43 AM
Hi,we are doing the same project(LED scrolling dis...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Aug 28 2017, 07:21 PM
First you have to decide which version of the 8051...
rawat742 Avatar
Posted By rawat742
Sat Aug 26 2017, 12:36 PM
Dear Sir, I want to purchase progra...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Aug 25 2017, 08:22 PM
Debuggers and programmers are different things.Whi...
rawat742 Avatar
Posted By rawat742
Thu Aug 24 2017, 04:30 PM
Dear Sir, if I am not purchase debugger then how ...
poojab51296 Avatar
Posted By poojab51296
Thu Aug 24 2017, 06:27 AM
I am using STM32 cube MX and Atollic truestudio so...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Aug 23 2017, 01:30 PM
It will be easier to help if you can post the comp...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Aug 23 2017, 01:24 PM
There is a company in china which makes 8051 micro...
ajay_bhargav Avatar
Posted By ajay_bhargav
Wed Aug 23 2017, 01:19 PM
Which library or driver are you using for SD card ...