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.


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Conversation

ExperimenterUK
Thu Apr 28 2016, 01:15 AM
We don't provide project reports. We try to help you do your project
Wed Apr 27 2016, 06:02 PM
abebe tigabu
help me by sending final thesis project automatoc green house effect control by arduino or by at89c51 microcontroller
Mon Apr 25 2016, 03:40 AM
abhinav kumar
Hey there, i want to project report on the RFID BASED SECURITY SYSTEM using AVR microcontroler.please mail as soon as possible. Thank you
Mon Apr 18 2016, 01:07 PM
umesh parekh
i want c code for rfid based car parking system using 8051 and parking slot indicator.if u have please email me
Mon Apr 18 2016, 10:35 AM
Prakash Rao
i need to work on OCR for Numbers, could not find any such projects done using 8051
Wed Apr 13 2016, 07:27 PM
Sanket GUPTA
hey i am new to embedded system and i want to pursue ms in embedded, i have 2 years before i can apply for ms.. in two years can i gain sufficient knowledge. i know c and c++
ExperimenterUK
Wed Apr 13 2016, 05:15 PM
@Suraj.. the method will work ,but edit to suit your compiler
Wed Apr 13 2016, 01:05 AM
Suraj Sridhar
Can I use the LCD Device driver code for STM32F401RET6?
Mon Apr 11 2016, 04:38 PM
Ankith
Can I get the code to access the file from 8051
Mon Apr 11 2016, 04:37 PM
Ankith
can I access a file or folder from sdcard using 8051 microcontroller?

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uk2308
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Tue Apr 19 2016, 04:35 AM

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