Tag - Microcontroller

Expanding IO Ports of PIC Microcontroller using MCP23S17

Usually a microcontroller comes with a limited number of IO ports called General Purpose Input Output (GPIO) ports. But some applications require more IO ports than that available on a microcontroller. In these cases we can use IO Port Expanders to increase the IO capability of a microcontroller. MCP23017 and MCP23S17 are two such 16 bit IO expander with Serial Interface  manufactured by Microchip. MCP23017 uses high speed I2C interface while MCP23S17 used high speed SPI interface. MCP23S17 In this tutorial we...

January 13, 2013By MikroC, PIC Microcontroller, Tutorials, , , 4 CommentsRead more...
PIC16F877A

Expanding Output Pins of a PIC Microcontroller through Multiplexing

Imagine that you want to control 100 LED's with a PIC Microcontroller. No PIC Microcontroller with a DIP package having that many IO lines. This article explains two ways to expand output pins of a Microcontroller through multiplexing. Here we are using Time Division Multiplexing to expand output pins. The first method is by using D-Latch and second method is by using Serial in Parallel Out Shift register. In this tutorial we demonstrate the working by using 64 LEDs. Using D Flip-Flop and Decoder 74574 Octal...

August 27, 2012By MikroC, PIC Microcontroller, Tutorials, , , 0 CommentsRead more...
PIC16F877A

PIC to PIC Communication using UART

Introduction PIC to PIC communication will be needed in some embedded applications. We have two options to transmit data through transmission lines. Parallel Transmission Serial Transmission Parallel Transmission Parallel Data Transmission In parallel communication an entire byte of data is transmitted at a time. That is each bit has dedicated line. Thus for 8-bit data transfer we need 8 dedicated lines as shown above. Serial Transmission Serial Data Transmission In Serial Transmission only one bit of a byte is transmitted at a time. There is only one communication line, thorough which...

July 3, 2012By MikroC, PIC Microcontroller, Tutorials, , , , 49 CommentsRead more...
PIC16F877A

Using Interrupt with PIC Microcontroller

Introduction Interrupt is the one of the most powerful feature in embedded applications. Almost all the real time applications are implemented using Interrupts. So what is an Interrupt...?? As the name suggests Interrupts are special events that requires immediate attention, it stops a microcontroller/microprocessor from the running task and to serve a special task known as Interrupt Service Routine (ISR) or Interrupt Handler. Suppose you are at home, taking coffee. Suddenly your mobile phone rings. You stop taking coffee and answer the call. When you have...

June 28, 2012By MikroC, PIC Microcontroller, Tutorials, , , , 27 CommentsRead more...
Comparator Symbol

Using Analog Comparator in PIC Microcontroller

Comparator Module in PIC Analog Comparator is a device which compares two voltage signals and switches its output to indicate which one is larger. The analog comparator is used in many applications such as battery charger, analog to digital converters, IR sensors where we need to compare two signals. Most of the PIC Microcontrollers have built in Comparator Module which makes ease of design and saves cost. For demonstration, we use PIC16F877A. PIC16F877A consists of two analog comparators which can be used in eight different...

June 25, 2012By MikroC, PIC Microcontroller, Tutorials, , , , 12 CommentsRead more...
PIC16F877A

Interfacing EEPROM with PIC Microcontroller

What is an EEPROM ? EEPROM is an abbreviation for Electrically Erasable  Programmable Read Only Memory and it is a Non-Volatile memory. It is used in computers and other electronic devices to store data that must me saved during no power supply. EEPROM is a class of ROM (Read Only Memory) which can be electrically erased in bit by bit and able to store new data. A small amount of EEPROM (usually 128/256 bytes) is available internally with PIC Microcontrollers. I have already posted about Using...

June 22, 2012By Electronics, MikroC, PIC Microcontroller, Tutorials, , , , 11 CommentsRead more...
Matrix Keypad

Interfacing Matrix Keypad with PIC Microcontroller using MikroC Library

I already posted about Interfacing Matrix Keypad with PIC Microcontroller with some user-defined functions. Advantages in using user-defined functions are we can extend it up to any number of keys and able to customise according to our application. The MikroC Pro for PIC Microcontrollers provides a library for working with 4*4 keypad. It can also be used to interface 4*3, 4*2 and 4*1 keypads. MikroC provides the following three functions to interface Matrix Keypad. Keypad_Init Keypad_Key_Press Keypad_Key_Click Keypad_Init Prototype: void Keypad_Init(void); It initializes a particular port for working with keypad. A global...

June 20, 2012By MikroC, PIC Microcontroller, Tutorials, , , , 9 CommentsRead more...
PIC16F877A

Using Internal EEPROM of PIC Microcontroller

There are commonly three types of memories in a PIC Microcontroller, Flash Program Memory, Data Memory (RAM) and EEPROM Data Memory. We write Programs in the Flash Program Memory of a microcontroller. Flash memory makes it possible to program a microcontroller many times before installing to device and even after the installation we can change the program. RAM Data Memory is used for storing data temporarily during program execution and it is volatile. That is, this memory is cleared when the power...

June 18, 2012By MikroC, PIC Microcontroller, Tutorials, , , 33 CommentsRead more...
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