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How to Interface Buzzer with PIC16F877A PIC Development Board

PIC16F/18F Development Board

The PIC16F/18F Development Board is specifically designed to help students to master the required skills in the area of embedded systems. The kit is designed in such way that all the possible features of the microcontroller will be easily used by the students. The kit supports in system programming (ISP) which is done through USB port.

Microchip’s PIC (PIC16F877A), PIC16F/18F Development Kit is proposed to smooth the progress of developing and debugging of various designs encompassing of High speed 8-bit Microcontrollers.

Buzzer

Buzzer is an electrical device, which is similar to a bell that makes a buzzing noise and is used for signaling. Typical uses of buzzers and beepers include alarm devices, timers and confirmation of user input such as a mouse click or keystroke.

Interfacing Buzzer

Fig. 1 shows how to interface the Buzzer to microcontroller. A piezoelectric element may be driven by an oscillating electronic circuit or other audio signal source, driven with a piezoelectric audio amplifier. Sounds commonly used to indicate that a button has been pressed are a click, a ring or a beep. When the input port pin from microcontroller is changed, the sound wave is changed in Buzzer.



Fig. 1 Interfacing Buzzer to Microcontroller

 

Interfacing Buzzer with PIC16F877A

A small piezoelectric buzzer on the PIC16F/18F Development Kit, by pulling pin PORTB.0 low, current will flow through the buzzer and a relatively sharp, single-tone frequency will be heard.

The alternative INT feature of pin PORTB.0 (the INT signal) can be used to modulate the buzzer to oscillate around different frequencies. Then the volume of the sound will be changed by alternating the pulse width. The buzzer can be disconnected by removing jumper JP5, and this is also the default position for this jumper since the buzzer sound can be quite annoying if always left on.

Pin Assignment with PIC16F877A

 

PIC16F

Buzzer Selection

Connections

PORTB.0

   

* Connect PORTB with JP5 (E-MECH) via FRC Cable

* Place a Jumper Between INT and +5V of J6 (J6 is verynear toBUZZER).

* Turn ON TXD and RXD Pins of CONFIG switch SW1.Connect Serial  

   cable between USART Section in theBoard and PC and open HyperTerminal

* Press RESET Once.

Output: Choose Any one from 1 to 6. The Corresponding Action Will Be carried out.

 



Circuit Diagram to Interface Buzzer with PIC16F877A





Source Code

The Interfacing Buzzer with PIC16F877A program is very simple and straight forward. We now want to generate a sound in PIC16F/18F Development Board by using a buzzer. The C programs are developed in Mplab software & it execute with Hi-Tech C Compiler.

C Program to generate sound in PIC16F using Buzzer

#include

//Define PIC Registers

#include

//Define I/O Function

#define Buz RB0

//RB0 interfaced to Buzzer __CONFIG(0x3f72);

//Select HS oscillator, Enable (PWRTE,BOREN),

//Disable (CPD,CP,WDTEN,In-circuit Debugger)

#define FOSC 10000

//10Mhz==>10000Khz

#define BAUD_RATE 9.6

//9600 Baudrate

#define BAUD_VAL ((char)(FOSC/ (16 * BAUD_RATE )) – 1)

//Calculation For 9600 Baudrate @10Mhz "void Serial_init(void);

//Serial Communication Initialization "void DelayMs(unsigned int);

void main()

{

unsigned char ReceivChar;

TRISB = 0x00;

PORTB = 0x04;

//PORTB configured as O/P Serial_init();

printf("\033[2J");

DelayMs(20);

printf("Press 1: Buzzer ON \n\r\t2: Buzzer OFF");

while(1)

{

while(RCIF==0);

//Wait until the reception is over RCIF=0;

//Clear the flag for next reception ReceivChar=RCREG;

//Store the received char to a variable printf(" %c",ReceivChar);

//Dislpay the character received switch(ReceivChar)

{

case '1': //If '1' is received Buzzer turned ON Buz=1;

break;

case '2': //If '2' is received Buzzer turned OFF Buz=0;

break;

}

}

}

void Serial_init()

{

TRISC=0xc0;

//RC7,RC6 set to usart mode(INPUT) TXSTA=0x24;

//Enable (Serial Transmission,

//Asynchronous mode, High Speed mode) SPBRG=BAUD_VAL;

//9600 baud at 10Mhz RCSTA=0x90;

//Usart Enable, Continuous receive enable TXIF=1;

//Start Transmit

}

void putch(unsigned char data)

{

while(TXIF==0);

TXREG=data;

//Transmit the data serially

}

void DelayMs(unsigned int Ms)

{

int delay_cnst; while(Ms>0)

{

Ms--;

for(delay_cnst = 0;delay_cnst <220;delay_cnst++);

}

}

To compile the above C code you must need the Mplab software & Hi-Tech C Compiler. They must be properly set up and a project with correct settings must be created in order to compile the code. To compile the above code, the C file must be added to the project.

In Mplab, you want to develop or debug the project without any hardware setup. You must compile the code for generating HEX file. In debugging Mode, you want to check the port output without PIC16F/18F Development Board

The PICKIT2 software is used to download the hex file into your microcontroller IC PIC16F877A through USB port.

Testing the Buzzer with PIC16F877A

Give +12V power supply to PIC16F/18F Development Board; the Buzzer is connected with PIC16F/18F Development Board. When the program is downloading into PIC16F877A in Development Board, the Buzzer output is working that the Buzzer is creating some sound.

If you are not getting any sound from Buzzer, then you just check the jumper connections & check the Buzzer is working or not. Otherwise you just check it with debugging mode in Mplab. If you want to see more details about debugging just see the videos in below link.

General Information

  • For proper working use the components of exact values as shown in Circuit file. Use new components.
  • Solder everything in a clean way. A major problem arises due to improper soldering, solder jumps and loose joints.
  • Use the exact value crystal shown in schematic.
  • More instructions are available in following Tutorials,

User Manual for PIC 16F/18F Development Kit

Create & Debug a project in Mplab using PIC16F877A