In this project, we will have brief discussion on how to interface 16×2 LCD module to AT89C51, which is an 8051 family microcontroller. We use LCD display for the displaying messages in a more interactive way to operate the system or displaying error messages etc. Interfacing 16×2 LCD with 8051 microcontroller is very easy if you understanding the working of LCD.
Diagram of target board using ATMEL microcontroller. Atmel 8051 Microcontroller Programmer Circuit Diagram >>>CLICK HEREAT89C51: AT89C51 is an 8-bit microcontroller and belongs to Atmel's 8051 family. PIN DIAGRAM: PIN DESCRIPTION: ISP PROGRAMMER: In-System. Block Diagram Inside AT89C51 AT89C51 Basic Components Important Pins On-Chip Internal RAM GPIO (General Purpose Input Output) Exploring the Capabilities of On-Chip Resources Programming for I/O Ports Pin Diagram: AT89C51 Registers Pin Description Port 3 Alternate Functions. Pdf of AT89C51 datasheet & pin diagram are also available at Engineers Garage. Easy-Downloader V2.0 for ATMEL 89C51 /52/55. – kswichit.com. Easy-Downloader V2.0 for ATMEL 89C51/52. After compiling the sourcefile in Assembly or C then download the hex. For those who can make thePCB with PDF file.
Hence, in this project, I will not only give the information of LCD and also provide the code in C language which is working fine without any errors.
Also get an idea about Interfacing LEDs with 8051 Mirocontroller
A Brief Note on 16×2 LCD
16×2 Liquid Crystal Display which will display the 32 characters at a time in two rows (16 characters in one row). Each character in the display is of size 5×7 pixel matrix. This matrix differs for different 16×2 LCD modules, if you take JHD162A, this matrix goes to 5×8. There are 16 pins in the LCD module, the pin configuration us given below
Ground pin | ||
Power supply pin of 5V | ||
Used for adjusting the contrast commonly attached to the potentiometer. | ||
RS is the register select pin used to write display data to the LCD (characters), this pin has to be high when writing the data to the LCD. During the initializing sequence and other commands this pin should low. | ||
Reading and writing data to the LCD for reading the data R/W pin should be high (R/W=1) to write the data to LCD R/W pin should be low (R/W=0) | ||
Enable pin is for starting or enabling the module. A high to low pulse of about 450ns pulse is given to this pin. | ||
DB0-DB7 Data pins for giving data(normal data like numbers characters or command data) which is meant to be displayed | ||
Back light of the LCD which should be connected to Vcc | ||
Back light of LCD which should be connected to ground. |
Adobe photoshop cs6 crack free download. So by reading the above table you can get a brief idea how to display a character. For displaying a character you should enable the enable pin (pin 6) by giving a pulse of 450ns, after enabling the pin6 you should select the register select pin (pin4) in write mode. To select the register select pin in write mode you have to make this pin high (RS=1), after selecting the register select you have to configure the R/W to write mode that is R/W should be low (R/W=0).
Follow these simple steps for displaying a character or data
- E=1; enable pin should be high
- RS=1; Register select should be high
- R/W=0; Read/Write pin should be low.
Neighbours from hell 3 game. To send a command to the LCD just follows these steps:
- E=1; enable pin should be high
- RS=0; Register select should be low
- R/W=0; Read/Write pin should be low.
Commands: There are some preset commands which will do a specific task in the LCD. These commands are very important for displaying data in LCD. The list of commands given below:
For switching on LCD, blinking the cursor. | |
Clearing the screen | |
Return home. | |
Decrement cursor | |
Increment cursor | |
Display on and also cursor on | |
Force cursor to beginning of the first line | |
Force cursor to beginning of second line | |
Use two lines and 5x7 matrix | |
Cursor line 1 position 3 | |
Activate second line | |
Jump to second line position 3 | |
Jump to second line position1 |
To get the detailed information, Click Here and Download the Datasheet
Interfacing 16×2 LCD with 8051 Circuit Diagram
Components Required
- AT89C51 (8051 Microcontroller)
- 16X2 LCD Display
- 11.0592MHz Crystal
- 2 X 33pF Capacitors
- 2 X 10 KΩ Resistors
- 1 KΩ X 8 Resistor Pack
- 10 KΩ Potentiometer
- 330Ω Resistor
- Push Button
- 10μF/16V Capacitor
- 8051 Programmer
- 5V Power Supply
- Connecting Wires
Circuit Explanation
The crystal oscillator, along with two 33pF Capacitors, are connected to XTAL1 and XTAL2, which will provide the system clock to the microcontroller.
RST Pin is pulled-LOW with the help of a 10KΩ Resistor. With the help of a 10μF Capacitor and a Push Button, you can reset the 8051 Microcontroller. EA is pulled-HIGH with the help of a 10KΩ resistor.
The data pins of the LCD are connected to PORT0 (first, the PORT0 pins must be pulled-HIGH with the help of a 1KΩ Resistor Pack). RS and E are connected to PORT2 pins P2.0 and P2.1.
A 10KΩ Potentiometer is used to adjust the contrast of the LCD.
Programming LCD to 8051
Coming to the programming you should follow these steps:
- STEP1: Initialization of LCD.
- STEP2: Sending commands to LCD.
- STEP3: Writing the data to LCD.
[Also Read: How To Make an Adjustable Timer ]
Initializing LCD
To initialize LCD to the 8051 the following instruction and commands are to be embed in to the functions
- 0x38 is used for 8-bit data initialization.
- 0xoC for making LCD display on and cursor off.
- 0X01 for clearing the display of the LCD.
- 0x80 for positioning the cursor at first line .
Sending Commands to the LCD
- E=1; enable pin should be high
- RS=0; Register select should be low for sending commands
- Placing the data on the data registers
- R/W=0; Read/Write pin should be low for writing the data.
Writing the Data to the LCD
- E=1; enable pin should be high
- RS=1; Register select should be high for writing data
- Placing the data on the data registers
- R/W=0; Read/Write pin should be low for writing the data.
Visage the anvil zip. Important Post – Interfacing 7 Segment Display with 8051 Microcontroller
Code
Additional Codes
The programs given below will use above functions and display the complete string which is given by the programmer to display the data. We have provided two demo codes working properly and easy to understand.
Code 1
Code 2
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