LCD INTERFACING WITH PIC MICROCONTROLLER,In this tutorial, you will learn to interface an LCD with a microcontroller. It is a very simple and easy to understand project for the beginners and is commonly used in several electronic products. LCD (Liquid Crystal Display)provides user interface and can be very useful for debugging purpose. After completion of this tutorial, you will be able to display data on an LCD using mikro C compiler. You should know how to use microcontroller and how to program pic microcontroller. You should also check how to use Mikro c for pic, if you have a beginner in Mikro c for pic programming.
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TASK of LCD interfacing with pic microcontroller
To interface LCD with PIC16F877A and display the text ‘LCD INTERFACE’ on it. LCDs comes in different sizes and shapes. For this project, we have selected a 16×2 character, alphanumeric LCD. It contains 2 rows of 16 character.
SDA – Serial Data. This line is used for both transmit and receive. SCL – Serial Clock. This is a timing signal supplied by the Bus Master device. It’s a simple demo but you can use the code to build projects using the LCD Keypad Display. LCD INTERFACING WITH PIC MICROCONTROLLER,In this tutorial, you will learn to interface an LCD with a microcontroller.It is a very simple and easy to understand project for the beginners and is commonly used in several electronic products. LCD (Liquid Crystal Display)provides user interface and can be very useful for debugging purpose. Now the objective of this project is to measure distance using the ultrasonic sensor, and then display that value on the LCD display. You should have the skills you need from the earlier lessons. Try and do this project on your own, but if you get stuck, you can look at my code below. Display Temperature on LCD: I will bring two projects together in this instructable.I will demonstrate how to measure the temperature using a LM35 temperature sensor and an Arduino then display the temperature on a serial LCD 16X2 in Celsius and Fahrenheit.You can find the i.
Its pin configuration is given as follows:
Pin Number | Name | Use |
1 | Vss | Ground |
2 | Vdd | Power |
3 | Vee | To adjust the contrast |
4 | RS | 1=Data input 0=Instruction input |
5 | R/W | 1=Read from LCD 0=Write to LCD |
6 | Enable (EN) | From 1 to 0 = Data is written to the LCD |
7 | DB0 | Data Bus Lines |
8 | DB1 | |
9 | DB2 | |
10 | DB3 | |
11 | DB4 | |
12 | DB5 | |
13 | DB6 | |
14 | DB7 | |
15 | LED+ | Backlight |
16 | LED- |
The LCD can work in two modes, 4-bit and 8-bit. In this tutorial, we have used the 4-bit mode which uses only 4 data lines, thus saving pins of the microcontroller. So It is recommended to use LCD in four bits mode to save pins of microcontroller for other purpose.
LCD Display Commands in Mikro c for pic
We have used 16×2 LCD which means there are 2 rows and 16 characters in each row. So we can display a total of 32 characters at a time in two rows with 16 characters in each row.
- Void Lcd_Out (char row, char column, char*text);
![Serial lcd display 20x4 Serial lcd display 20x4](/uploads/1/2/6/0/126004855/870291126.png)
This is the main command which prints our text on LCD. It also gives privilege to specify the position of text. In horizontal direction we count rows number and in vertical direction we count the column number. In above command
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- row specifies the starting position of text in row. We specify the number of row like 1 or 2 according to our requirement in which row we want to print text.
- column specifies the starting position of text in column. We specify the number of column like (1,2,3,.16) according to our requirement in which row we want to print text.
- text specifies the text we want to display on LCD
For example the command Lcd_Out (1, 1, “LCD”); will print the text LCD starting from position of row 1 and column 1.
Lcd_Out (2, 1, “LCD”); will print the text LCD starting from position of row 2 and column
Lcd_Out (1, 5, “LCD”); will print the text LCD starting from position of row 1 and column 5.
Serial Lcd Display Module
However if your string is longer than the number of characters that could be displayed in a row from starting position, the last characters will not be displayed. E.g. Lcd_Out (1, 6 “LCD Interface”); will display text in row 1 starting from column position 6 and will display only LCD Interfa the rest of the characters will not be displayed as there is no room for them.
- void Lcd_Out_Cp(char *text); will start printing the text from current cursor position. For example after printing Lcd_Out (1, 1, “LCD”); if you write Lcd_Out_Cp(“Hello”); it will display “Hello” at position from column position of 4 in row 1.
- void Lcd_Chr(char row, char column, char out_char); allows only single characters to be displayed at specified positions. E.g. Lcd_Chr(2, 5, ‘A’); will print only A on column 5 row 2.
- void Lcd_Chr_Cp(char out_char); allows to print only single character from current cursor position like after Lcd_Chr(2, 5, ‘A’); if your write Lcd_Chr_Cp(‘B’); it will be printed at row 2 column 6.
CIRCUIT DIAGRAM OF LCD INTERFACE WITH PIC16F877A microcontroller
LCD Connections with pic microcontroller
- Connect pin1 of LCD to ground and pin2 to Vdd.
- Pin3 of LCD is used to adjust the contrast of the display. Leave it unconnected.
- RS (pin4) of LCD is connected to RB2 of PORTB. It distinguishes between data input and command input.
- RW (pin5) is grounded, since we have to write the data on LCD.
- E (pin6) is connected to RB3 of PORTB. It is a control line to inform the LCD that data has been sent.
- D0-D3 of the LCD are grounded, since we are using a 4-bit mode. D4-D7 are connected to the PORTB pins (RB4-RB7) of the controller.
C-CODE FOR LCD INTERFACE WITH PIC MCU
Write the following code in mikroC Compiler
When using PIC microcontroller, the mikroC compiler has a built-in LCD library that supports the commands to carry out LCD initialization. The library consists of a number of functions to control LCDs with 4-bit data interface.
The main program first clears the LCD screen and then displays “LCD INTERFACE” in the first row of LCD. The LCD pin directions are all set as outputs. The RS pin of LCD is set to 1, which indicates that the information received from DB4-DB7 is a valid text to be printed on LCD screen. The EN pin is also set to 1 which indicates that data is send to the LCD.
LCD display with cursor position control USING PIC MICROCONTROLLER
This code will be used to display characters on cursor location and specific location on LCD.
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Arduino Serial Lcd Display
Programmed LCDs are vastly used for industrial as well as commercial applications. LCDs are used in UPSs or inverters, where voltage and current readings are displayed on the screen. Instructions to be followed are displayed on an LCD screen in airports, banks, hospitals etc.If you still have any issue after reading this article, feel free to comment on this post with your issues.