lcd touch screen pic microcontroller free sample

I looked at a few libraries (Arduino ones) to get inspiration. In LCD_I2C_PCF8574.c I have added a lot of background and links to where you can get hold of other source, documentation and data on the PIC18F2685, I2C, the LCD and IO expander should you be so inclined. I also added a link to the library I ripped for the character generation. Thanks Mario. This file also contains details on how you may want to customise to your implementation, these are tagged with "TODO adapt" so you can use the MPLABX task list to grab them.

I took all my details/nomenclature etc. from an Hitachi hard copy LCD manual (yes hard copy, real paper an"all!) I obtained in the early 1980"s when we were still printing on flattened trees.

PIC microcontrollers are electronic circuits that can be programmed to carry out a vast range of tasks. The name PIC initially referred to “Peripheral Interface Controller”. Later it has been changed to “Programmable Intelligent Computer”. The PIC microcontrollers are mainly used by hobbyists and experimenters, especially in the fields of electronics and robotics. The main features of PIC microcontroller are wide availability, low cost, ease of reprogramming with built-in EEPROM, an extensive collection of free application notes, abundant development tools, and a great deal of information available on the Internet. The PIC microcontrollers often appear under the brand name PICmicro.

Today, many engineering students are showing lot of interest towards embedded systems projects in which microcontrollers are used. Among all the microcontrollers, 8051 and PIC are the 2 types of microcontroller which are playing important role due to their features. So, here we have listed out some of the best projects ideas based on PIC microcontroller which can be useful for engineering students in completing their Graduation successfully.

If you are interested, you may check the list of the following PIC microcontroller projects and write your feedback, new ideas, suggestions and requests in our contact us page.

[adsense2]SPI (serial peripheral interface) by using PIC micro controller. The SPI is most popular device that is used to transfer the serial data. In this project, we introduce two types of serial interfacing devices, like SPI master and SPI slave. The output of the master SPI will control the data flow of the slave SPI.

In this tutorial, you will learn to interface anLCD with a pic microcontroller. It is very simple and easy to understand the project for beginners and is commonly used in several electronic products. LCD (Liquid Crystal Display)provides a user-friendly interface and can be very useful for debugging purposes. After completion of this tutorial, you will be able to display data on an LCD using MPLAB XC8 Compiler and Mikro C compiler. We will provide examples with two Compilers such as MPLAB XC8 Compiler and Mikro C for PIC.

The reason LCD is more popular than LED, Seven Segment displays. Because we can display characters, numbers and custom characters with ease ( Just by easily programming a module).

First of all, to interface LCD with a pic microcontroller, we used GPIO pins.  GPIO pins are general-purpose input-output pins. Because we send control and data signals to LCD through these I/O pins.  Therefore, you should know how to use digital input-output pins of the pic microcontroller. To know about GPIO pins programming, check these tutorials:

It 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 the microcontroller for other applications.

As you can see in this diagram, if we use 8-bit mode interfacing, we will need to use 11 pins of pic microcontroller. On the other hand, if we use 4-bit mode, we need only 6 GPIO pins. Therefore, it is recommended to use 4-bit mode interfacing.  The only difference between  4-bit and 8-bit is that data transfer speed is faster for 8-bit mode. However, it doesn’t make any major difference.

A variable resistor is used to adjust the contrast of 5×8 dot pixels according to background light. Therefore, if you are not able to see anything on LCD after programming, the maximum changes are that you need to adjust contrast with the variable resistor. This contrast register makes adjust to the voltage applied on the VEE pin.

For MPLAB XC8 Compiler, we will use the PIC18F4550 microcontroller. For MikroC Pro for PIC, we will use the PIC16F877A microcontroller. In the case of MPLAB XC8, we will develop our own LCD library. Because the XC8 compiler does not provide built-in libraries. In the contrary, MikroC Pro provides libraries for all modules such as LCD, Keypad, ADC Module, UART module.

In this section, we will see how to write example code for 16×2 LCD interfacing with PIC18F4550 microcontroller. Although, you can use see code with other Pic microcontrollers also.

As we mentioned earlier, we can use the 8-bit mode and 4-bit mode interfacing. But due to the efficient use of MCU pins, we will be using 4-bit Mode. To interface LCD, we follow these steps:

In this circuit, we used the PORTB of PIC18F4550. But you can use any PORT. To do this, we need to change the pin assignment inside the code. I will show you how to assign pins for LCD in the next section.

These lines define which pins of the pic microcontroller should connect with LCD. For instance, in this example, we used the PORTD of PIC18F4550 microcontroller. Connect RD0-RD3 pins with D4-D7 pins of LCD respectively and other pins with RW, EN, RS and Power pins. But you can change PORT to other PORT of PIC microcontroller also by changing the PORT name with these commands.

LCDWriteNibble() function is used to write a nibble. Nibble is basically a half a byte. Because we are using LCD in four bits mode. Therefore, we need to send 8-bit commands/data in four bits chunks. This function writes the specified nibble to the LCD.

void LCDPutChar(char ch): Writes a character to LCD at current cursor position. This function displays the specified ASCII character at the current position on the LCD.

LCDGoto(char pos, char ln): This function positions the cursor at the specified line and column. Column and line at which the cursor should be positioned between 0-15 for pos (column) and 0-1 for ln(row).

In this section, we will see how to interface LCD with pic microcontroller and programming examples using MikroC for pic. MikroC pro has a built-in library.

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.

This is the main command which prints our text on LCD. It also gives the privilege to specify the position of the text. In the horizontal direction, we count rows number and in a vertical direction, we count the column number. In above command,

However if your string is longer than the number of characters that could be displayed in a row from the 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 Interfacethe 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 the current cursor position. For example after printing Lcd_Out (1, 1, “LCD”);if you write Lcd_Out_Cp(“Hello”);it will display “Hello”at a 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 writeLcd_Chr_Cp(‘B’);it will be printed at row 2 column 6.

To interface LCD withPIC16F877A and display the text ‘LCD INTERFACE’ on it. LCDs come in different sizes and shapes. For this project, we have selected a 16×2 character, alphanumeric LCD. It contains 2 rows of 16 character.

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.

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.

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