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

ajay_bhargav
Sat Aug 30 2014, 12:15 PM
@sufiyan, You can use solenoid lock in place of LED.
Fri Aug 29 2014, 12:17 AM
sufiyan
please can you tell me which type of lock activator should i connect in place of LED? can i use selenoid lock actuator
ajay_bhargav
Thu Aug 28 2014, 06:34 AM
Please post questions in forum
Thu Aug 28 2014, 01:44 AM
yednekachew
can you give a project made bay proteus software
Mon Aug 25 2014, 07:12 AM
Vinod Soni
Hi Sir, How can i make this RFID with ATMega16/32 controller
pavanjain
Sat Aug 23 2014, 05:10 AM
Sir i want to download the hex file in P89v51rd2 microcontroller using max232 IC but we not load the program in IC
Tue Aug 19 2014, 04:51 PM
allen ndumu
please i will like to know if the problem of speed control of dc motor using keypad and l298 was if yes can i have the complete project send it to the address i really need to see it
Tue Aug 19 2014, 10:47 AM
Amit Bisht
sir i want to have some trending projects on which i could work related to ATmega 16 microcontroller
ExperimenterUK
Sat Aug 16 2014, 04:16 PM
@diligent . create a thread
Sat Aug 16 2014, 03:17 PM
diligent
in assembly langauage programming..

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bobparihar
Mon Sep 01 2014, 06:19 AM
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Sun Aug 31 2014, 08:33 AM
[email protected]
Sat Aug 30 2014, 04:45 PM
enisi
Wed Aug 27 2014, 06:08 AM
sadalakshmi
Wed Aug 27 2014, 12:39 AM
Paecake
Sun Aug 24 2014, 04:07 PM
pavanjain
Sat Aug 23 2014, 02:33 AM
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Thu Aug 21 2014, 02:30 PM

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ExperimenterUK Avatar
Posted By ExperimenterUK
Tue Sep 02 2014, 03:32 PM
does it is TTL compatible? I checked the data shee...
Peter_Parker Avatar
Posted By Peter_Parker
Tue Sep 02 2014, 11:20 AM
What is your graph displaying ?I'm assuming it is ...
bobparihar Avatar
Posted By bobparihar
Tue Sep 02 2014, 01:59 AM
iam using EM-18 reader module.. but i want only to...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Sep 01 2014, 10:59 PM
What is your graph displaying ?I'm assuming it is ...
Peter_Parker Avatar
Posted By Peter_Parker
Mon Sep 01 2014, 06:19 PM
Just to add to this,I've connected this now to a C...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Sep 01 2014, 07:28 AM
Which RFID module are you using? Post link to the ...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Sep 01 2014, 07:28 AM
We prefer to use English language on our forums. B...
bobparihar Avatar
Posted By bobparihar
Mon Sep 01 2014, 06:33 AM
i am using a RFID module, i want to connect reader...